S
S A variable for any distance in the direction of the beam or for the length of the bunch itself. Distances are measured in the `Z' direction.
S Siemens.
S2 C2 Stanford-SLAC Cryo-EM Center
SCSC Stanford-SLAC Cryo-EM Specimen preparation Center
S K-XAS An imaging technique using low-energy ranges and the element sulfur.
S&E Safety and Environmental (ES&H). Also, Science and Engineering.
S&H Safety and Health.
S&ORIP Safety and Operational Reliability Improvements Project.
S&R Shipping and Receiving.
S/CI Suspect or Counterfeit Items.
S2C2 Stanford-SLAC Cryo-EM Center
S30XL Sector 30 transfer Line
S3DF SLAC Shared Science Data Facility
SA Supply Air.
SAA Safety Access Area.
SAA South Atlantic Anomaly. Anomaly in earth's magnetic field.
SAA Satellite Accumulation Area.
SAC SLAC Architectural Committee.
SACLA Spring-8 Angstrom Compact free-electron LAser. (RIKEN, Japan)
SAD Safety Analysis / Assessment Document.
SAFARI Spica FAR-infrared Instrument.
Safety Barrel A cylindrical shield used to protect exposed wires like PLIC line junctions. It is made of metal and always grounded.
Safety, Health, and Assurance A department within the Environment, Safety, and Health (ES&H) Division.
SAG Senior Advisory Group. (US)
SAGE Formerly the Soviet-American Gallium Experiment, now officially named Russian-American Gallium Experiment, although the original acronym has been retained.
SAGENAP Special Accelerator Group for Experiments in Non-Accelerator Physics
SAGE-S SLAC Accelerating Girls' Engagement in STEM
SAID Scattering Analyses Interactive Dialin
SAL Saskatchewan Accelerator Laboratory.
SALLIE Stanford ALL Image Exchange.
SALT Strategic Arms Limitation Treaty
SALTA Snowmass Area Large-scale Time-coincidence Array.
SAM Software Asset Management
SAM Small Angle Monitor. See also Mini Sam.
SAM Smart Analog Module. A 32-channel module used to digitize analog signals. It is used to monitor the LINAC waveguide temperatures, small magnet currents, and miscellaneous analog reference signals.
SAM Software Asset Management
SAML Security Assertion Markup Language
SAO Smithsonian Astrophysical Observatory.
SAP Scientific Advisory Panel, initiated by Prop. 65. (CCR Title 22, Sec. 12301 et seq)
SAPE SSRL Accelerator Procedures-Engineering.
SAR Supplied Air Respirator.
SAR Safety Analysis Report.
SARA Superfund (CERCLA) Amendments and Reauthorization Act. Title III of this act created federal community right-to-know program. See also EPCRA.
SARA Heavy ion facility in Grenoble, France.
SARA-NIKHEF National Center for Computing and Networking Services and the National Institute for Nuclear Physics and High Energy Physics, based in the Netherlands.
SAREC SLAC Accelerator Research Experimental Committee.
SARS-CoV-2 Severe Acute Respiratory Syndrome CoronaVirus 2
SAS Science Analysis Software. (GLAST)
SASE Self-Amplified Spontaneous Emission.
SASER Acoustic equivalent of a laser.
SASS SLAC Association of Students Seminars.
SAT Site Acceptance Test
SATAN Security Administrator Tool for Analyzing Networks.
SATF Self-Assessment Task Force.
SATIF Shielding aspects of Accelerators, Targets and Irradiation Facilities.
SATS Self-Assessment Tracking System.
SATURNE II Saclay Saturne II proton, charmed meson, and helium nucleus synchrotron.
SAURON Spectroscopic Areal Unit for Research on Optical Nebulae.
SAW Self-Avoiding Walk
SAX Small-Angle Xray.
SAXS Small-Angle X-ray Scattering
SB Senate Bill.
SB Strawman Baseline. (ILC)
SB See SBST.
S-BAND 2856 Mhz. The microwave frequency used to accelerate particles in the LINAC. The wavelength at this frequency is 10.5 cm, or about 4 and 1/8 inches.
SBBSTR SuBbooSTer. An amplifier station where the RF signal coming from the x6 multiplier is boosted for the klystrons of a LINAC sector. Subboosters are either klystron tubes or solid state.
SBE State Board of Equalization.
SBI SubBooster Interface. A CAMAC module that handles control and monitoring for each subbooster. It provides the accelerate and standby triggers to the Subbooster modulators.
SBK Sheet Beam Klystron.
SBNG StarBurst Nucleus Galaxies
SBST SuBbooSTer. An amplifier station where the RF signal coming from the x6 multiplier is boosted for the klystrons of a LINAC sector. Subboosters are either klystron tubes or solid state.
SC Super-Conducting.
SC Super Computing (as in SC04, SC05, etc.)
SC DOE Office of Science (Government organizational code).
SC Safety Collimator.
SCA Scientific Computing Applications department (SLAC).
SCA SuperConformal Algebra
SCADA Supervisory Control And Data Acquisition.
SCAG State of California Association of Governments.
SCALLA Structured Cluster Architecture for Low Latency Access.
Scanning Wire Ion Chamber See SWIC.
SCAP Security Content Automation Protocol.
SCAQMD South Coast Air Quality Management District.
SCAS Stanford Contractor Assurance System.
Scavenger See Scavenger Beam.
Scavenger Beam The high-current electron beam sent to the target to produce positrons. It is called Scavenger because it uses the leftover RF power after the main collision bunches are accelerated.
Scavengy A multiknob used to tune the energy of the scavenger beam. This is done by varying the phase of Subboosters 17 and 18.
SCBA Self-Contained Breathing Apparatus.
SCCDPH Santa Clara County Department of Public Health.
SCCS Scientific Computing and Computing Services.
sCDM standard Cold Dark Matter
SCDMS Super Cryogenic Dark Matter Search
SC&EA Strategic Communications & External Affairs (SLAC)
SCET Soft Collinear Effective Theory.
SCFF Super Conducting Final Focus.
SCFT SuperConformal Field Theory
SCGF DOE Office of Science (SC) Graduate Fellowship program.
SCGSR DOE Office of Science (SC) Graduate Student Research program.
SciDAC Scientific Discovery through Advanced Computing. (DOE)
Scintillator A type of detector that makes use of the flash of light emitted by the electrons in an excited atom falling back to their normal energy or `ground' state after having been excited by a passing particle. Used in conjunction with a photomultiplier to produces a measurable current for each `scintillation.' The most common scintillator material is plastic.
SCIPP Santa Cruz Institute for Particle Physics.
SCL Safety Check List.
SCM SuperConducting Magnet
SCM Supply Chain Management.
SCOAP3 Sponsoring Consortium for Open Access Publishing in Particle Physics.
SCORM Sharable Content Object Reference Model.
SCP Site Characterization Plan.
SCPD Stanford Center for Professional Development
SCR Silicon Controlled Rectifier. A solid-state electronic switch which holds off voltage until its gate lead is pulsed, which then causes conduction until the device is back biased, or zero biased. SCRs are used frequently as the main rectifiers in large, variable current, regulated power supplies.
Scraper See Collimator.
SCRF SuperConducting RadioFrequency.
SCRM Supply Chain Risk Management
SCROD School Cosmic Ray Outreach Detector.
SCS Scientific Computing Systems (or, historically, SLAC Computing Services)
SCSC Scientific Computing Steering Committee.
SCSI Small Computer System Interface.
SCSS SPring-8 Compact SASE Source (Japan).
SCT SemiConductor Tracker.
SCT Superconducting Triplets. The superconducting quadrupoles in Final Focus.
SC-TBD Secondary Containment - Technical Basis Document.
SCUBA Submillimeter Common User Bolometer Array.
SCVPGM Sagittal focusing and converging beam
SD Surface Detector (Auger Observatory).
SD Silicon Detector.
SD Schwinger-Dyson.
SD Sextupole Defocusing.
SDE Schwinger-Dyson Equations
SDF Sludge-Derived Fuel.
SDG SelfDual Gravity
SDI State Disability Insurance.
SDL Subbooster Drive Line. The Rf line from any given subbooster to the 8 klystron modulator stations in the particular sector it drives.
SDLC System Development LifeCycle. Also Software Development LifeCycle.
SDLC Serial Data Link Controller.
SDLCQ Supersymmetric Discrete Light Cone Quantization
SDM Software Development and Maintenance.
SDMP injector Spectrometer DuMP. (SLAC)
SDN Science Data Network. (DOE)
SDO Solar Dynamics Observatory.
SDOHS State Department of Health Services, California. It is also known as CDHS, DHS, and DOHS.
SDP Permanent Sextupole - Defocusing.
SDR System Design Review
SDS SLAC Design Services.
SDS Safety Data Sheet.
SDSL Symmetric Digital Subscriber Line. A technology that allows high volumes of data, up to 3Mbps, to be sent over existing conventional copper telephone lines.
SDSS Sloan Digital Sky Survey.
SDSS-II Sloan Digital Sky Survey-II.
SDWA Safe Drinking Water Act. (Federal)
SEABA Science Education Academy of Bay Area
Search Reset A PPS status obtained after a search and needed to put a PPS area in 'No Access' mode. Search reset buttons are located outside the PPS gates except for the BSY and the LINAC. The search team leader must press a searched zone's search reset button at the same time that a similar button is depressed at MCC in order to get 'search status set' for any given zone, so that the 'No Access' state can be achieved for that zone, and beam brought through the zone.
SEC SECtor.
SecCM Security-focused Configuration Management.
SECO SEcondary Engine Cutoff. (NASA)
Secondary Emission Monitor See SEM.
Secondary Treatment The second step in most publicly owned waste treatment systems in which bacteria consume the organic parts of the waste. It is accomplished by bringing together waste, bacteria, and oxygen in trickling filters or in the activated sludge process. This treatment removes floating and settleable solids and about 90 percent of the oxygen-demanding substances and suspended solids. Disinfection is the final stage of secondary treatment. See Primary Waste Treatment and Tertiary Treatment.
SEC-SAXS Size Exclusion Chromatography SAXS
Security Crash A PPS incident which occurs when the PPS security of the machine is lost. It may be caused by a person opening a secured door to a searched zone, or by an electrical failure in the PPS system.
SED Spectral Energy Distribution.
SED Stream EDitor. A powerful Unix command for modifying the information in a pipeline.
SEDA SLAC Engineering Document Archive
SEDAC Safety and Environmental Discussion Assistance Committee
SEDP Safety and Environmental Discussion Program.
SEE Satellite Energy Exchange.
Seeman Screen Profile Monitor screens at the end of the LINAC in sector 29 and 30. The beam is deflected by pulsed kickers on to these screens. Named after their designer, John Seeman.
SEET SLAC Ergonomic Evaluation Team.
SEGUE Sloan Extension for Galactic Understanding and Exploration.
SEIS Supplemental Environmental Impact Statement.
SEIU Service Employees International Union.
SELEX SEgmented LargE X baryon spectrometer.
SEM Scanning Electron Microscope.
SEM Secondary Emission Monitor. The SEMs are thick metal plates insulated from ground. When struck by a beam, these devices produce a shower of electrons from the plate. The plate then becomes positive and a signal is extracted to the BCS racks.
SEM Site Engineering and Maintenance.
SEN Secretary of Energy Notice.
Sensitizer A substance which produces an allergic reaction.
SEP SEPtum.
SEPT SEPTum magnet.
Septa Plural of Septum.
Septum A magnet incorporating a partition with a strong field on one side and little or no field on the other. It is used in combination with a kicker to bend one beam while leaving another undisturbed, usually in order to inject and/or extract a beam from a storage ring. it can be either a vertical or horizontal bend. See Lambertson.
Septum Bump An orbit bump created around a septum magnet to move the beam path into the 'no field' area of a septum. Septum bumps are usually four magnet bumps, which allow control of the beam's angle as well as its offset through the septum area.
SERA SLAC Emergency Relief Association.
SERC State Emergency Response Commission. (EPCRA)
SERG Science and Engineering Research Group (SU Libraries).
Serial Crate Controller See SCC.
SERPUKHOV SERPUKHOV proton synchrotron (76 GeV/c Plab).
SERPUKHOV UNK SERPUKHOV multi-TeV proton machine.
SERT SLAC Emergency Response Team.
Server A computer that shares its resources, such as printers and files, with other computers on the network. An example of this is a Network Files System Server which shares its disk space with a workstation that does not have a disk drive of its own.
SESAME Synchrotron-light for Experimental Science and Applications in the Middle East.
SETI Search for Extraterrestrial Intelligence. (Institute)
SEXT SEXTupole. A six-pole magnet used to eliminate chromatic aberrations in a beam transport system.
Sextupole See SEXT.
SF Sextupole Focusing.
SF Schrödinger functional
SFA Scientific Focus Area
SFF South Final Focus.
SFG Spectrometer Facilities Group.
SFM CERN split-field magnet.
SFMP Surplus Facilities Management Program of Strategic Facilities Master Plan.
SFR Star Formation Rate.
SFS Spent-Fuel Standard
SFT Permanent Sextupole - Focusing.
SG Safety Glasses, with wide shield, or Safety Goggles.
SG Sine-Gordon
SGD Soft Gamma-ray Detector. One of the planned components of ASTRO-H.
SGM Superon Graviton Model.
SGML Standard Generalized Markup Language. A system for organizing and tagging elements of a document. See also XML.
SGR Soft Gamma Repeater
SHA Safety, Health and Assurance. (Dept. in ES&H)
SHAB Second Harmonic AfterBurner. (LCLS)
SHALA Stanford Health and Lifestyle Assessment.
SHAM Sample and Hold Module.
SHCDM Super-Hubble Cold Dark Matter.
SHDM Super-Heavy Dark Matter.
SHM Safe Hold Mode.
SHMET SHeet METal.
Shower Any multiplicative radiation effect whereby a particle 'creates' two or more particles, each of which creates two or more, etc. causing a 'shower' of radiation from a few initial particles. Also, a cascade of particles generated by pair production and bremsstrahlung radiation.
SHPO State Historic Preservation Office. (California)
SI System Integrator. (Computing)
SIAD Stanford Internal Audit Department.
SIAM Summary Interlock and Alarm Module
SIB Storage Interface Board.
Siberian Snake A term coined by Y.S. Derbenev and A. Kondralenko at the Institute of Nuclear Physics in Novosibirsk, the Siberian Snake is a device to be inserted into the lattice of a circular accelerator to preserve the polarization of a proton beam during the acceleration process.
SIC Standard Industrial Classification.
SID SLAC Institutional Database.
SiD Silicon Detector concept for the ILC.
SID # SLAC Institutional Database Number. A number given to every employee, contractor, or other worker at SLAC. Formerly called the BinKey (during SLAC's mainframe days).
SIDIS SemiInclusive Deep Inelastic Scattering.
SIEM Security Incident and Event Monitoring. (Computing)
Sierra Monitor A computerized hazardous gas analyzing station with 16 multiplexed input channels and a printer. It is used to monitor oxygen deficiency in the pit and in the NRTL cryogenics system.
Sieve Collimator A special collimator used in CID to control beam current. The collimator has four or five holes with various diameters and can be rotated for a desired aperture. Two of the apertures have multiple small holes like a sieve, allowing from ten percent to 33 percent of the beam to get through.
SIGM Serpukhov CERN-IHEP magnetic spectrometer (SIGMA).
Sigma A statistical parameter referring to the standard deviation of a distribution where 'one sigma' means one standard deviation away from the median (the square root of the variance). It is used for a bunch of particles approximated to a normal, or Gaussian distribution. For a normal distribution, 68 percent of the particles are within 'one sigma,' 95 percent are within 'two sigmas' and 99.7 percent within 'three sigmas.' In a storage ring, the aperture should be at least eight sigmas for reasonable lifetimes.
Sigma The size (section) of a beam, assuming that the bunch shape is Gaussian and limited to one sigma.
Sigma Matrix A matrix description of the phase space distribution of a beam.
Sigma Phi The vertical angular divergence at the IP.
Sigma Theta Horizontal Angular divergence at the IP.
Sigma X The transverse size of the beam in the X, or horizontal direction.
Sigma Y The transverse size of the beam in the Y, or vertical direction.
Signal Words The words used on a pesticide label--'Danger,' 'Warning,' 'Caution'--to indicate the level of toxicity of the chemicals.
Signal-to-Noise Ratio When used in reference to Usenet activity, 'signal-to-noise ratio' describes the relation between amount of actual information in a discussion, compared to their quantity. More often than not, there is substantial activity in a newsgroup, but a very small number of those articles actually contain anything useful.
Signature The small, usually four-line message at the bottom of a piece of E-mail or a Usenet article. In Unix, it is added by creating a file '.signature' in the user's home directory. Large signatures are a no-no.
SIIMS SLAC Issues & Improvements Management System
SIL Safety Integrity Level.
SILI Silicon detector.
Silicon Controlled Rectifier See SCR.
SIMES Stanford Institute for Materials and Energy Sciences. (Formerly XL AM).
SIMP Strongly Interacting Massive Particle
SIMPLE 2000 Superheated Instrument for Massive ParticLE searches
Simple Mail Transfer Protocol See SMTP.
Simple Network Management Protocol See SNMP.
Single Beam Dumper A pulsed magnet in the 51 or 52 line that kicks the beam to a dump. Used to dump the beam whenever the arcs are not ready. Some MPS trips cause the Single Beam Dumper to fire.
SINGS SIRTF / Spitzer Infrared Nearby Galaxies Survey.
Singularity A point with infinite density where space-time is infinitely curved a boundary or edge to space-time.
SINQ Swiss Spallation Neutron Source (Paul Scherer Institute)
SIOP Serial Input -- Operating Parallel.
SIP State Implementation Plan. (from CAA)
SiPIN Silicon Positive-Intrinsic-Negative photodiodes.
SiPM Silicon PhotoMultiplier.
SISGR Single-Investigator and Small-Group Research. (DOE)
SISSA Scuola Internatizionale Superiore du Studi Avanzati. (Trieste, Italy)
SIT Saitama Institute of Technology. (Japan)
SIT South Injection Tunnel. The positron transport line going from the BSY to PEP. Also: South Injection Transport.
SIT System Integration Test. (OCIO)
SITE Superfund Innovative Technology Evaluation Program. (from CERCLA)
SiW Silicon tungsten group (ILC).
SIXA Silicon X-ray Array
SK SuperKamiokande.
SKA Square Kilometer Array.
SKdV Supersymmetric Korteweg-de Vries
Skew Quad A quadrupole whose axis is rotated 45 degrees. This puts the coils vertical and horizontal instead of `X' shaped as in a regular quadrupole.
Skyshine Air-scattered radiation.
SL energy defining SLit, high Z slit.
SL SuperLattices
SLA Service Level Agreement
SLAC Stanford Labor Action Coalition.
SLAC ScaphoLunate Advanced Collapse.(Wrist condition: see http://www.medmedia.com/ooa1/98.htm)
SLAC SLAC National Accelerator Laboratory. (Formerly Stanford Linear Accelerator Center.)
SLA C Energy Doubler See SLED.
SLAC Orange A portable ionization chamber survey meter designed by the SLAC Health Physics Group and fabricated onsite.
SLAC Standard Operating Procedure See SOP.
SLAC Web page a Web Page that is served by a SLAC computer.
SLACERT SLAC Emergency Response Team.
SLACNET SLAC NETwork.
SLACronym Acronym / lingo used at SLAC.
SLACS Sloan Lens ACS survey. An efficient Hubble Space Telescope (HST) snapshot imaging survey for new galaxy-scale strong gravitational lenses.
SLCCC Systems of Laboratories Computer Coordinating Committee. (DOE)
SLDA Superfluid Local Density Approximation.
SLED SLAC Energy Doubler. A system of RF resonant cavities on the output of each klystron which doubles the strength of the electric field delivered to the LINAC. It works by storing the front, or leading half of the klystron pulse, and then adding that energy to the rear, or trailing half of the pulse to get a pulse which is about half as long but twice as strong in peak power. 'Sledding' the linac has enabled it to double its total accelerating range from about 30 GeV to 60 GeV at a fraction of the cost of doubling the number of klystrons.
SLED II SLAC Energy Doubler, version 2. Upgrade to SLED system designed by Sami Tantawi.
SLEGS Shanghai Laser Electron Gamma Source.
Sleuth A model-independent search strategy for new high-pT physics, developed by physicist Bruce Knuteson and used by the D0 collaboration in Tevatron Run I. Initially known as Sherlock, the name was changed to Sleuth to avoid trademark litigation.
SLEW Stanford-SLAC Engagement Working Group
sLHC Super LHC.
SLI Science Laboratory Infrastructure.
SLIC GEANT4-based flexible full-detector simulation program. Replaces LCDG4.
SLIP Serial Line IP. A protocol that allows a computer to use the Internet protocols and become an Internet member with a standard phone line and a high-speed modem. Being superseded by PPP but still used.
SLM Synchrotron Light Monitor.
Slow Valve See VAT Valve.
SLS Swiss Light Source, a synchrotron radiation facility at the Paul Scherrer Institute (Switzerland).
SLSO Systems Laser Safety Officer.
SLTR South LINAC To Ring.
SLUM Silicon LUMinosity tracker.
SLUO SLAC Users Organization (previously SLAC-LBL Users Organization)
SLV-III Satellite Launch Vehicle-III.(India)
SM Standard Model.
Small Angle Monitor See Mini Sam.
Small Power Supply See SMPS.
SMART Safety MAnagement Records Tool. (database)
Smart Analog Module See SAM.
SMART goals Specific, Measurable, Attainable (or aligned), Relevant (results-oriented or realistic), Time-bound goals for job performance.
SMARTS Small and Moderate Aperture Research Telescope System.
SMASH-ML Solving Materials And Structures by Heuristic Machine Learning
SMB Structural Molecular Biology.
SMBH Super Massive Black Hole.
SMC Spin Muon Collaboration (CERN)
SMC Small Magellanic Cloud
SMCT Semiconductor Multiple-Compton Telescope.
SMDS Switched Multimegabit Data Service. An emerging high-speed networking technology to be offered by the telephone companies in the U.S.
SME Subject Matter Expert.
SME Standard Model Extension.
SMEX SMall EXplorer (NASA Program).
SMG Standard Model Gauge group
SML Standby Maintenance List (Artemis).
SM-LWFA Self-Modulated Laser Wakefield Acceleration
SMMC Shell Model Monte Carlo
Smog Air pollution associated with oxidants.
SMRT Single Molecule Real Time. Pacific Biosciences trademark term for its biological analysis platform.
SMS Surface and Materials Science department (Formerly Physical Electronics).
SMS Safety Management System.(SLAC's ISMS program.)
SMT Senior Management Team.
SMT SAM Tester.
SMTF Superconducting Module Test Facility. (ILC)
SMTP Simple Mail Transfer Protocol. The Internet standard protocol for transferring electronic mail messages from one computer to another. SMTP specifies how two mail systems interact and the format of control messages they exchange to transfer mail.
SN ServiceNow.
SN SuperNova
SN1987A SuperNova 1987A.
SNA Systems Network Architecture. The proprietary network architecture of IBM.
SNAP SuperNova Acceleration Probe/Program. See JDEM.
SNARL Suggested No Adverse Response Level.
SNBO SuperNova Burst Observatory.
SND Spherical Nonmagnetic Detector
SNe SuperNovae.
SNF Stanford Nanofabrication Facility.
SNI Super Nova Type I
SNIa Type Ia SuperNovae.
SNIC SLAC-Novosibirsk Instrumentation Conference.
SNIF Secret Neutrino Interactions Finder.
SNII Type II SuperNovae.
SNLO Select Non-Linear Optics.
SNMP Simple Network Management Protocol. The network management protocol of choice for TCP/IP-based internets.
SNO Subdury Neutrino Observatory (Canada). Also referred to as SNOLab.
SNOLAB Sudbury Neutrino Observatory LABoratory. (Canada)
SNR SuperNova Remnant
SNS Spallation Neutron Source. (Oak Ridge)
SNUG Synchrotron Neutron User Group. PHOTON
SNUR Significant New Use Rule. (from TSCA)
SO Secretarial Officer.
SO Safety Officer (institutional).
SO2 Sulfur Dioxide. A heavy, pungent, colorless, gaseous air pollutant formed primarily by industrial fossil-fuel combustion processes.
SOC Science Operation Center (GLAST-NASA).
SOC Synthetic Organic Chemical.
SOC Safety Overview Committee.
SODA SLAC Online Drawing Access. (database) Obsolete: see SEDA.
Soft Bend A weak bend magnet, usually the last bend in a string before a target or interaction point, which, due to its lower strength, creates less synchrotron radiation noise on the detection apparatus.
SOG Science Operations Group.(GLAST)
SOI Silicon-On-Insulator.
SOIC SSRL Operator In Charge.
SOLEIL Source Optimisee de Lumiere d'Energie Intermediaire du Lure. Third-generation synchrotron radiation source in France.
Solid State Subbooster See SSSB.
Solubility The ability of a solid, liquid, or gas to dissolve in a solvent (usually expressed in water). Not related to density or specific gravity.
Solvent A substance (usually liquid) capable of dissolving or dispersing one or more other substances.
SOM Same-Order Mode.
SOML Steward Observatory Mirror Laboratory (Arizona).
SON Safety Orientation for Non-employees (ES&H)
SOP Standard Operating Procedure. SOP numbers are given to SLAC documents on various subjects.
SOR Synchrotron Orbital Radiation.
Sorbent A material that attracts and holds another material.
SORI Safety and Operational Reliability Improvements project.(Sometimes written as S&ORI)
Sorption The action of soaking up or attracting substances. A process used in many pollution control systems.
SOUD SOUDan underground detector (MN, USA)
SOUDAN 2 One-kiloton underground detector in former iron mine in Soudan (MN, USA)
Source The area or device where a beam of particles originates, as in 'positron source.'
SOW Statement Of Work.
Space Charge The repulsive Coulomb forces in a bunch of particles of the same polarity.
SPAFOA Superconducting Particle Accelerator Forum of the Americas.
SPAG Standards Promotion and Application Group. A group of European OSI manufacturers which chooses option subsets and publishes these in a 'Guide to the Use of Standards' (GUS).
Spallation A process in which a beam of protons smashes into a target, releasing a flood of neutrons.
SPATS South Pole Acoustic Test Setup.
SPC Scientific Policy Committee. From 2005-2008, the SLAC Policy Committee.
SPCC Spill Prevention, Countermeasures and Control plan.
SPD Strategic Projects Division.(LCLS)
SPEAR Stanford Positron Electron Accelerating Ring. Created in 1970 out of the SLAC operating budget (it was not separately funded). Originally designed in 1963 as a single-ring machine called the SLAC Electron-Positron Colliding Beam Storage Ring, the design was upgraded in 1969 and a double-ring asymmetric machine, the 'Stanford Positron Electron Asymmetric Rings' (hence, SPEAR)was proposed. When funding failed to materialize, the project was scaled back to a single, racetrack-ring configuration and the acronym was converted to the machine's one-word name. (For a time the scaled-back, single-ring revised design was referred to as 'SPEAR 1/2', but the name did not stick.) Many high-energy physics experiments have been conducted in this facility, two of which have earned Nobel prizes: one for the discovery of the Psi/J particle, or Charmed Quark in 1974, and a second for the discovery of the Tau lepton in 1975. SPEAR is now being used as a synchrotron light source by many experimenters from all over the world, and it is probably the most useful high-energy physics machine ever built.
SPEAR 3 Planned upgrade of SPEAR that proposes to replace the ring with a new set of magnets and other components which would improve its performance as a light source.
SPEC SPECification.
SPEC Spectrometer.
Special Review Formerly known as Rebuttable Presumption Against Registration (RPAR), this is the regulatory process through which existing pesticides suspected of posing unreasonable risks to human health, non-target organisms, or the environment are referred for review by EPA. The review requires an intensive risk/benefit analysis with opportunity for public comment. If the risk of any use of a pesticide is found to outweigh social and economic benefits, regulatory actions--ranging from label revisions and use-restriction to cancellation or suspended registration--can be initiated.
Specific Gravity The ratio of the density of a substance to the density of water.
SPECT Single-Photon Emission Computer Tomography.
SPECT SPECTrometer line.
Spectrometer Energy Spectrometer. A device to measure the energy spectrum of a beam. Sometimes call a Mass Spectrometer. A beam of a given mass and energy is bent around a noodle shaped bend magnet into a detector or counter. Only particles of the required or specified mass and velocity (energy) will be bent into the target by the carefully regulated field of the bend magnet.
SPi Smart Plug-in (HP integrated module used for Oracle PeopleSoft Enterprise application)
SPICA SPace Infrared telescope for Cosmology and Astrophysics.
SPIE International Society for Optical Engineering.
Spill Monitor An ion chamber near the beampipe designed to show the operators the relative amount of beam being lost by 'scraping' on the inside of the beampipe, or on any upstream device.
Spill Response Environmental Safety and Health procedure for responding to the accidental overflow of hazardous or non-hazardous material.
SPIM Selective Plane Illumination Microscope.
Spin Rotator A solenoid magnet used to rotate the spin axis of electrons in a polarized beam.
SPIRAL Système de Production d'Ions Radioactifs Accélérés en Ligne. (System for the Production of Radioactive Ions Accelerated on Line) Caen, France.
SPL Single Purchase Limit.
SPL Superconducting Proton Linac (CERN-proposed).
SPL Sample Preparation Laboratories (LCLS)
SPOF Single Point Of Failure.
Spoiler A device to blow up the beam size. A spoiler is used in front of the positron target. Spoilers are used to reduce the density of energy deposited on a dump, stopper, or other target. Instead of the tightly focused beam burning a hole in the dump, stopper, or target, the spoiler `spreads the misery around,' distributing the energy over the whole frontal area of the device.
Spot The bright mark made by the beam on a profile monitor screen. Generally, operators try to reduce the size of the spot and give it a good shape by adjusting machine parameters that are upstream of the screen.
SPP Strategic Partnership Projects
SPPC SPoolPieCe.
SPPS Sub-Picosecond Particle Source (formerly Sub-Picosecond Photon Source).
SPPS Super antiProton Proton Synchrotron (CERN).
SPring-8 Super Photon ring-8 GeV. Synchrotron radiation source at Harima, Japan.
SPRL State Priority Ranking List.
SPs Service Packs (computing).
SPS Super Proton Synchrotron (CERN)
SPS+ Superconducting SPS.
SPSC Super Proton Synchrotron Committee (CERN).
SPSC SuperProton-Synchrotron Collider.
SPSCL Set-up Phase Safety Checklist. (LCLS)
SPTpol South Pole Telescope polarization-sensitive microwave camera.
SPTRM SPecTRoMeter.
SPTT SPuTTering.
SPY Secondary Particle Yield (CERN experiment)
SQ Sub-scale Quadrupole.
SQCD Supersymmetric QCD
SQED Supersymmetric Quantum ElectroDynamics.
SQF Safety Qualification Form.
SQG Small Quantity Generator. (from RCRA)
SQL Structured Query Language. The international standard language for defining and accessing relational databases.
SQM Strange Quark Matter.
SQM Supersymmetric Quantum Mechanics.
SQN Strange Quark Nuggets.
SQS Space of Quantum States.
SQUID Superconducting QUantum Interference Device.
SR Sponsored Research
SR Synchrotron Radiation.
SR SteRadian.
SR Shielded Room. A PPS Item.
SR2A Synchrotron Radiation in Art and Archeology (workshop).
SRB Storage Resource Broker (grid software).
SRB South Reverse Bend. See RB.
SRCF Stanford Research Computing Facility.
SRCF-II Stanford Research Computing Facility annex (planned construction)
SRD Science, Research and Development division. (LCLS)
SRF Superconducting RF.
SRF Superconducting Radio-Frequency.
SRI Synchrotron Radiation Instrumentation
SRL Synchrotron Radiation Laboratory (Japan).
SRMS Synchrotron Radiation in Materials Science (conference).
SRR Site Recommendation Report.
SRR System Requirements Review
SRS Savannah River Site. (DOE)
SRS Synchrotron Radiation Source
SRTL South Ring To LINAC.
SRX Sub-micron Resolution X-ray spectroscopy.
SS Suspended Solids.
SS Source and Special
SSA Single Spin Asymmetries.
SSB Spontaneous Symmetry Breaking.
SSB Science Support Building. See SUSB.
S-SBM Strangeness-including Statistical Bootstrap Model
SSC Stop-Start-Continue.
SSD Silicon Strip Detector. (GLAST)
SSE Stars and Stellar Evolution.
SSED System Safety Engineering Division
SSI SLAC Summer Institute.
SSJ Single-Source Justification.
SSL Secure Sockets Layer. A protocol developed by Netscape for transmitting private documents via the internet. SSL works by using a private key to encrypt data that is transferred over the SSL connection. Many web browsers support SSL, and many Web sites use the protocol to obtain confidential user information, such as credit card numbers. Web pages that require an SSL connection start with https instead of http.
SSM Supersymmetric Standard Model
SSMB Steady State Micro Bunching
SSO Single Sign On
SSO SLAC Site Office. (DOE)
SSOW SLAC Statement of Work.
SSP Shared Services Package (Microsoft).
SSP Site Safety Plan.
SSP System Security Plan. (OCIO)
SSPM Solid-State PhotoMultiplier
SSPR Self-Service Password Reset.
SSRC Synchrotron Radiation Research Center. (China)
SSRF Shanghai Synchrotron Radiation Facility.
SSRL Stanford Synchrotron Radiation Lightsource. A division of SLAC which does experiments with synchrotron light generated by the SPEAR storage ring. The synchrotron light produced by the SPEAR ring is a relatively narrow bandwidth, 'hard' X-Ray spectrum that is very useful in medical research, as well as in crystallography. (Formerly Stanford Synchrotron Radiation Laboratory 1977-2008, and Stanford Synchrotron Radiation Project 1973-1977.)
SSRLUOEC SSRL Users' Organization Executive Committee.
SSRO SLAC Sponsored Research Office.
SSRP Stanford Synchrotron Radiation Project (1973-1977). Became SSRL in 1977.
SSSB Solid State SuBbooster. The subboosters driving some of the klystrons are solid state (ex. K02, EP02, Rings).
SSSP Site-Specific Safety Plan.
SSUN SLAC, Stanford University, NREL. (SIMES)
SSUSY Second derivative SUperSYmmetry.
STA SLAC Training Assessment. A process matching training with hazards an individual faces in his/her work.
STA Science and Technology Agency. Japanese government agency which, along with the Ministry of Education, Science, Sports and Culture (Monbusho) funds big science in Japan.
STACEE Solar Tower Atmospheric Cherenkov Effect Experiment. (Sandia)
Standardization The process of cycling magnet currents through a preset pattern to establish a known hysteresis point in the iron of each magnet. This gives any particular magnet field configuration the necessary repeatability to be useful in beam operations.
Standards Prescriptive norms which govern action and actual limits on the amount of pollutants or emissions produced. EPA, under most of its responsibilities, establishes minimum standards. States are allowed to be stricter.
Standards Promotion and Application Group See SPAG.
Standby See STB.
Standby Maintenance List A waiting maintenance list updated every morning at the Maintenance Meeting and posted near the MCC door. The list includes the problems, the area, the entry needs or not, and the person to contact.
Standby Timing The continuous timing and pulsing of a kicker magnet or klystron even when no beam code triggers are present. The Standby time is 15 to 50 microseconds after beam time and is different for each sector to avoid acceleration of dark current. The stations need to be pulsed on standby to keep them warmed up so they will be in time and at the right energy when they are actually used to accelerate the beam.
STANFORD Positron Electron Accelerating Ring See SPEAR.
Stanford Synchrotron Radiation Laboratory See SSRL.
STAP Staff Training Assistance Program. (Stanford University)
STAR Scientific and Technical Abstracts Reports.
STAR Science Teachers And Researchers. (SLAC, CSU, Bechtel)
STAR Solenoidal Tracker At RHIC (BNL)
STAR Stop Think, Act, Review
Star Network LAN in which multiple workstations are connected to a central server. All communications must be routed through the central server.
STARE Survey for Transient Astronomical Radio transmission
STARS Stanford Training And Registration System
START Scintillation Tile with mrs Apd light ReadouT.
START Safety Toward Avoiding Risk Today.
Station Usually refers to one of the klystrons of the LINAC, together with its modulator and other auxiliary devices necessary for operation.
Status Display Summary See SDS.
STAU Supersymmetric TAU
STB Standby. A klystron CUD message indicating a poor or bad standby timing result. See Standby Timing.
STB Simple Timing Buffer. A CAMAC timing module which converts differential MECL timing backplane signals to front panel NIM pulses. Used with a PDU.
STCC Standard Transportation Commodity Code.
Steer To guide a beam through its preferred optical path using the available corrector magnets and trim windings allocated for that purpose. Since upstream changes in steering magnify effects the further downstream you go, steering is usually done with the aid of computer programs based on mathematical models of the lattice. These are called `Autosteering' programs.
STELLA Staged Electron Laser Acceleration. (Brookhaven)
STEM Science Technology Education and Math.
Stepper Motor Controller See SMC.
STF Superconducting rf Test Facility (KEK).
STFC Science and Technology Facilities Council. (UK)
STI Steel Tank Institute.
STI Scientific and Technical Information.
STIC Small angle TIle Calorimeter
STIRAP STImulated Raman Adiabatic Passage
STLC Soluble Threshold Limit Concentration. (CCR Title 22)
Stochastic resonance A nonlinear phenomenon in which random noise optimizes a system's response to a weak signal.
STOP A trigger used to control the output of the thermionic gun in the injector by changing the bias on the grid. Trigger time is converted to a bias voltage.
Stopper A PPS device used to stop the beam, usually by allowing a heavy metal slug to pivot into the beam's path.
STORI an International Conference on Nuclear Physics at Storage Rings, originally called the Symposium on Nuclear Physics at Storage Rings.
STP Standard Temperature and Pressure.
STPR Stopper.
STR Special Theory of Relativity
STRAW Thin walled tube chambers.
Streak Camera A device that measures the time distribution of a light pulse. Used to measure bunch length. Very fast pulses of the order of a nanosecond or less can be measured with a Streak Camera.
Strict Liability Holds a party responsible for damages irrespective of the amount of care taken in handling a hazardous substance.
STRIPES Strategic Integrated Procurement Enterprise System (DOE)
STRN Standard Technical Report Number.
STRP Staff Tuition Reimbursement Program (Stanford University).
Structured Query Language See SQL.
STTR Small business Technology TransfeR. (US Gov't)
STXM Scanning Transmission X-ray Microscope.
SU Stanford University.
SU-17A Employee First Report of Injury form
Subbooster See SBST.
Subbooster Drive Line See SDL.
Subbooster Interface See SBI.
Subharmonic Buncher See SHB.
Subtitle 1 The part of RCRA which pertains to the storage of petroleum products and hazardous substances, other than wastes, in underground tanks.
Subtitle C The part of RCRA which pertains to the management of hazardous waste.
SUD Safe Use Determination.
SUGRA SUperGRAvity
Sulfur Dioxide See SO2.
SULI Science Undergraduate Laboratory Internship. (Formerly: SLAC Undergraduate Laboratory Internship)
Summarize To encapsulate a number of responses into one coherent, usable message. Often done on controlled mailing lists or active newsgroups, to help reduce bandwidth.
SUMMIT Stanford University Medical Media and Information Technology.
SUNCAT SUstainable eNergy through CATalysis. (SLAC Photon Science initiative)
SUNET Stanford University NETwork.
Sun's Network Information Service See NIS.
SUOH Stanford University OverHead.
Superfish A modeling program used for CID which includes the S-BAND buncher and K02. It is able to calculate the field in a cavity.
Superfund See CERCLA.
Supergravity An enrichment of ordinary general relativity in which the space/ time coordinates are fermionic as well as bosonic. It is an up- dating of general relativity to include fermions just as supersymmetry is an updating of special relativity to take into account that fermions exist.
SuperKamiokande A neutrino detector built in Japan to observe neutrinos from the Sun and supernovae. The detector is a 50,000 ton water tank that is 41 meters high, 39 meters wide, and surrounded by 11,200 giant photomultiplier tubes. The tubes detect the flashes of Cherenkov radiation produced when the neutrinos interact with the water. The detector is located in a lead-zinc mine under 1000 meters of rock, which filter out the background cosmic rays.
Supersymmetry A conjectured symmetry between fermions and bosons. Two- dimensional supersymmetry emerged historically from Pierre Ramond's discovery in 1970 of how to incorporate fermions into string theory. Supersymmetry was formulated as a four-dimensional symmetry by Julius Wess and Bruno Zumino in 1974. It was also conceived independently by Yuri Gol'fand and Eugeny Likhtman in 1971.
SURA Southeastern Universities Research Association.
SURF Sanford Underground Research Facility (Lead, South Dakota)
SUSB Science and User Support Building.
SUSY SUperSymmetrY.
SUSYM SUperSymmetric Yang-Mills.
SUTI Sensitive Unclassified Technical Information
Suzaku Astro-E2 / ASTRO-EII. Renamed Suzaku (Red Bird) in July 2005.
SV Schedule Variance.
SV Small Velocity
SVAC Science Verification And Calibration. (GLAST)
SVD Singular Value Decomposition
SVT Silicon Vertex Tracker.
SW Solid Waste.
SW Seiberg-Witten
SWAA Satellite Waste Accumulation Area.
SWAT Solid Waste Assessment Test. (CGC Sec. 66796.53, 66796.54, CWC Sec. 1 3273)
SWG Science Working Group.
SWG Space Working Group (SLAC).
SWIC Scanning Wire Ion Chamber. A precise beam position measuring device used to calculate beam energy.
Swift-BAT Swift Burst Alert Telescope. (NASA-Goddard)
Switched Multimegabit Data Service See SMDS.
SWKB Supersymmetric Wentzel-Kramers-Brillouin
SWMB Solid Waste Management Board (aka CWMB).
SWMR Single-Writer Multiple-Reader.
SWOPSI Stanford Workshops On Political and Social Issues.
SWOT Strengths, Weaknesses, Opportunities and Threats.
SWP Safety Watch Person.
SWPPP Storm Water Pollution Prevention Plan.
SWRCB State Water Resources Control Board. (California)
SXNS Surface X-ray and Neutron Scattering.
SXR Soft X-Ray materials science instrument. (LCLS)
SXRD Synchrotron-based surface X-Ray Diffraction.
SXRSS Soft X-Ray Self Seeding.
SYM Supersymmetric Yang-Mills
Synchronous Data Communications in which transmissions are sent at a fixed rate, with the sending and receiving devices synchronized.
Synchrotron Feedback A damping ring RF feedback system which regulates the longitudinal beam oscillations due to the RF driving forces.
Synchrotron Light See Synchrotron Radiation.
Synchrotron Oscillation A longitudinal oscillation induced in an accelerated bunch by the RF driving forces imparted to the bunch by the cavities.
Synchrotron Radiation When a charged particle such as an electron or positron is bent in a magnetic field, it loses energy in the form of photons (light) which are given off in a direction tangential to the curved path of the charged particle. These photons are called Synchrotron Radiation after the high energy physics machine where they were first observed. The photon energy increases with the 4th power of the beam energy and decreases with the square of the radius of curvature. Synchrotron light, or X-rays, are used for beam observation purposes, for the study of the structure of matter, and for medical research. See also SPEAR.
Synergism The cooperative interaction of two or more chemicals or other phenomena producing a greater total effect than the sum of their individual effects.
Systems Network Architecture See SNA.
SYZ Strominger-Yau-Zaslow.
SZ Sunyaev-Zeldovich
SZE Sunyaev-Zel'dovich Effect.
