M
M&O Management and Operations.
M&S Materials and Supplies.
M13 Messier 13
MA Magnetic Alloy
MAC Macintosh computer.
MAC Machine Advisory Committee. (ILC)
MAC Moves, Adds, Changes. (Telecommunications)
MAC Most Attractive Channel
MACHe3 MAtrix of Cells of superfluid 3He.
Machine Protection System See MPS.
MACHO MAssive Compact Halo Object, or Massive Astrophysical Compact Halo Object
MACRO A sequence of keyboard or touch panel operations created and saved to be initiated by one keystroke as an Operator aid. Also, a user- defined abbreviation for one or more lines of code.
MACRO Monopole, Astrophysics and Cosmic Ray Observatory
MacSamson A file transfer and terminal emulation program that allows a Macintosh to be used as a terminal for a host computer.
MAD Multiple wavelength Anomalous Dispersion phasing. A primary means of solving protein structures.
MAD Methodical Accelerator Design. A data input format for TRANSPORT.
MAGIC Major Atmospheric Gamma Imaging Cherenkov Telescope, on the Canary Island of La Palma.
Mail Gateway A machine that connects to two or more electronic mail systems (especially dissimilar mail systems on two different networks) and transfers mail messages among them.
Mailing List A discussion group, sometimes moderated, whose messages are distributed via e-mail from a central computer which maintains the list of people involved in the discussion.
Main Beam Containment Unit See MBCU.
Main Control Center See MCC.
Main Drive Line See MDL.
Main Manifold Controller A chassis monitoring the vacuum level of a system.
Majordomo A free mailing list server that runs under UNIX. When e-mail is addressed to a Majordomo mailing list, it is automatically re-broadcast to everyone on the list. The result is similar to a newsgroup or forum, except that the messages are transmitted as e-mail and are therefore available only to the individuals on the list.
MAN Metropolitan Area Network. (DOE - SF Bay Area)
Management Information System See MIS.
Manhist Program for MANipulating HISTograms. C
Manifest Form which indicates generator, quantity, type of waste, and disposer of waste for each shipment of hazardous wastes sent to offsite facilities.
MAP Management Assessment Program. (SLAC)
MAPS Monolithic Active Pixel Sensor.
Marx Modulator An electrical circuit designed to generate a high voltage impulse. Named for Edwin Otto Marx, who first described such a circuit in 1924.
Mask A collimator used to shelter a detector from synchrotron radiation or other low-energy radiation. It is also used to protect detector components from direct hits by an errant beam.
Mass Spectrometer See Spectrometer.
Master Oscillator The oscillator generating the RF distributed by the MDL to the whole LINAC. The frequency is 476 MHz (the 6th subharmonic of the 2856 MHz LINAC klystron frequency).
Master Pattern Generator Zero See MP00.
Master Trigger Generator See MTG.
Material Safety Data Sheet See SDS.
MATLAB A matrix manipulation software package for computation and plotting.
Matrox Board A hardware interface card, made by the Matrox Corporation, used to drive video display monitors. For example, a scrolling graphic display of both beams showing the energy and current as transmitted to MCC by the Micro FB31 from BPMs reading in a dispersion region in the arcs.
MAX II Storage ring for electrons at MAX-lab, Lund University, Sweden.
MAX IV Storage ring facility at MaxLab in Lund, Sweden inaugurated June 2016.
MB See Megabyte.
MB Maxwell-Bozmann
MBAM Microsoft Bitlocker Administration and Monitoring.
MBCU Main Beam Containment Unit. An interlock chassis at NPI and CID for use by the beam containment system for wide pulse beams.
MBE Multiple beam experiment
MBE Molecular Beam Expitaxy
MBH Massive Black Hole.
MBI MicroBunching Instability.
MBK Multi-Beam Klystron.
MBps MegaBytes per second.
MBR Molecular Beam Resonance technique.
MBTS Minimum Bias Trigger Scintillators. (LHC)
MC Monte Carlo. See Monte Carlo Method.
MC Mode Converter
MC Macromolecular Crystallography
MCC Motor Control Center.
MCC Merchant Category Code.
MCi MegaCurie.
MCIC The Metals and Ceramics Center (Columbus, OH).
MCL Maximum Contaminant Level.
MCL Maximum Concentration Level
MCMC Markov Chain Monte Carlo
MCNP Monte Carlo simulation package (LANL).
MCP Major Capital Project.
MCR Methyl-Coenzyme M Reductase.
MCRG Monte Carlo Renormalization Group
McT McCallum-Turner, Inc.
MD Management Directive.
MD Mechanical Design. Department (SLAC).
MD Manual Damper.
MD1 Magnetic detector at VEEP-4, Novosibirsk
MDA Minimum Detectable Activity.
MDH4 MoDe Hutch 4. Also, MDH5, MoDe Hutch5. Aligns control of stoppers to the hutch taking beam. PHOTON
MDI Machine Detector Interface.
MDL Main Drive Line. A temperature-stabilized coaxial cable which carries the 476 MHz master oscillator signal, and a fiducial synchronizing signal used to unify timing of the klystrons in the LINAC and to trigger the PDUs. The length of the MDL is monitored by an interferometer, since changes in its length due to thermal changes will result in klystron phase changes down the LINAC.
MDM Mobile Device Management.(OCIO)
MDM Mixed Dark Matter
MDOT MicroDOT gas chambers
MDP Markov Decision Process.
MDRP Millikan DRoP measurement.
MDT Monitored Drift Tubes.
MD Time Machine Development Time (i.e. for internal, non-user accelerator and FEL work)
ME Mechanical Engineering. Department (SLAC).
ME2 see MEE.
MEA Medium-Energy Accelerator.
MEC Mission Executive Council.
MEC Matter in Extreme Conditions or Material at Extreme Conditions.
Mechanical Design See MD.
Mechanical Engineering See ME.
MECi Matter in Extreme Conditions instrument. (LCLS)
MECL Motorola Emitter Coupled Logic. An integrated circuit technology used for fast logic boards.
MECO Muon-to-Electron COnversion.
MEC-U Matter in Extreme Condition Upgrade
MED Mechanical Engineering and Design. (SLAC)
MED Medical Department.
Medium The material used to support the transmission of data. This can be copper wire, coaxial cable, optical fiber, or electromagnetic wave (as in microwave).
MEDSI Mechanical Engineering Design of Synchrotron radiation equipment and Instrumentation.
MEE Materials in Extreme Environments. (LCLS)
Megabyte 1,048,576 bytes or 1,000 kilobytes, roughly one million bytes or one thousand kilobytes.
Mega-Czar Term used to designate person within a group who has responsibility for administration of a type of information resource, and who is authorized to appoint other czars within their computing group. See also czar.
Mega-Electron-Volt See MeV.
Megaflops One million floating-point operations per second. Abbreviated MFLOPS.
MEIS Molecular Environmental Interface Science.
Melting Point See MP.
MEM Maximum Entropy Method.
Memorandum of Understanding See MOU.
MEMS MicroElectroMechanical Systems.
MES Molecular Environmental Sciences. A discipline which uses synchrotron-based spectroscopic techniques to study environmental problems.
MESH Microfulidic Electrokinetic Sample Holder.
MESI Mechanical Engineering Safety Inspection.
MET METallographic.
MET Metrology Department (SLAC)
Meta Data Data about data. In an electronic environment, meta data's basic elements are a structured format and a controlled vocabulary, which together allow for a precise description of a digital entity's content, location, and value.
Meter Relay A Beam Containment module which looks at a magnet power supply to require that its voltage, as read on the meter, be inside or outside some set points. See also Beam Containment System.
Method 18 An EPA test method which uses gas chromatographic techniques to measure the concentration of individual volatile organic compounds in a gas stream.
Method 24 An EPA reference method to determine density, water content, and total volatile content (water and VOC) of coatings.
Method 25 An EPA reference method to determine the VOC concentration in a gas stream.
METSD Mechanical Engineering and Technical Support Division.
MeV Mega-Electron-Volt. 1 Million eV. The LINAC klystrons accelerate the beam approximately 200 MeV per station.
Mev-UED Mega Electron Volt Ultrafast Electron Diffraction instrument (LCLS)
MEWP Mobile Elevated Work Platform. Work surface higher than four feet, e.g. scissors lift or articulating boom lift
MEXT Ministry of Education, Sports, Science and Technology (Japan).
MFA Multi-Factor Authentication.
MFD Mechanical Fabrication Department.
MFD Multi-Function Device
MFD Mechanical Fabrication Department.
MFD Mechanical Facilities Department.
MFENET Magnetic Fusion Energy NETwork. It is centered at the Lawrence Livermore Lab.
MFG ManuFacturinG.
MFM Magnetic Force Microscopy.
MFT Managed File Transfer.
MFX Macromolecular Femtosecond (X)crystallography.
MGC Microgap Gas Chambers
mgd Million gallons per day.
MHD MagnetoHydroDynamics
MHS Message Handling System. The system of message user agents, message transfer agents, message stores, and access units which together provide OSI electronic mail.
MHz MegaHertz.
MICADO A steering algorithm meaning in French "MInimisation des CArres des Distortions d'Orbite" which translates to Minimization of the squares of the orbit distortion. One of several methods used by the orbit correction programs at SLAC.
Microbial Action Using the action of microbes to destroy or transform compounds.
Micromegas MICRO-MEsh GASeous detector.
MIE Major Items of Equipment.
Mie A scattering spectroscopy used to study changes in the size and index of refraction of spherical and non-spherical particles whose size is within a factor of 10 from the light's wavelength. (SLAC-R -611)
Million Instructions Per Second See MIPS.
MILNET MILtary NETwork. Originally part of the ARPANET, MILNET was partitioned in 1984 to make it possible for military installations to have reliable network service, while the ARPANET continued to be used for research.
MIL-SPEC MILitary SPECifications.
MIME Multipurpose Internet Mail Extensions. A way to attach any kind of file to an e-mail message. Supersedes uuencoding in newer Unix e-mail systems.
MIN MINute.
MinSec Minimum Security requirements (computing)
MIPS Million Instructions Per Second. Refers to the average number of machine language instructions a computer performs in one second.
MIRAS Infrared microspectroscopy beamline at ALBA.
MIRI Mid InfraRed Instrument. (JWST)
MIS Management Information System. A formal network that extends computer use beyond routine reporting and into the area of management decision-making. Its goal is to provide the correct information to the appropriate manager at the right time.
MIT Massachusetts Institute of Technology
Mitigation Measures taken to reduce adverse impacts on the environment.
MITOMI Mechanically Induced Trapping of Molecular Interactions.
MJ MegaJoule
MKB MultiKnoB. An operator station knob moving the field, the timing, or the phase of more than one device at the same time.
mKdV modified Korteweg-de Vries
MKN Maung-Kahana-Norbury.
ML Machine Learning
ML Microwave Lab (Stanford)
MLE Maximum Likelihood Estimate.
MLEV Magnetic LEVitation.
MLLA Modified Leading Log Approximation
MLLW Mixed Low Level Waste.
MLVR Medium and Low Voltage Revitalization
MMC see Main Manifold Controller.
MMF Magnetic Measurement Facility (B081)
MMGC Main Manifold Gauge Controller. A special gauge (one per sector) which senses vacuum for an entire sector. In the event of a vacuum leak, the MMGC sends two signals: one to the TIU, which interrupts the beam in the injector and one to the Fast Valve Controllers, whose valves seal and isolate that Sector from the rest of the accelerator.
MMI Maintenance Management Index.
MMIC Monolithic Microwave Integrated Circuit.
MMNTM MoMeNTuM.
MMS Missing Mass Spectrometer.
MMX Matrixed Mfd technicians for X-ray operations.
MNS Maki-Nakagawa-Sakata.
MOA Memorandum of Agreement
MOC Mission Operations Center (GLAST).
MOCVD Metal-Organic Chemical Vapor Deposition.
MOD MODel.
Modulation A method used in modems to make data processing signals compatible with communication facilities.
MoEDAL Monopole and Exotics Detector At the Large hadron collider.
MOJAVE Monitoring Of Jets in Active galactic nuclei with VLBA Experiments . (US and Europe)
Moller Polarimeter A device used to detect the degree of polarization of electrons by using a polarized target and the Moller effect.
Moller Scattering An elastic collision between two electrons.
MOM Momentum
MoNA Modular Neutron Array. (NSCL)
MONALISA
MONitoring Agents in a Large Integrated Services Architecture.
MONALISA MONitoring ALIgnment and Stabilization with high Accuracy. (AFT2 system).
MONARC Models of Networked Analysis at Regional Centres. LHC computing project.
MOND MOdified Newtonian Dynamics.
MONO MONOchromator. (LCLS)
Monte Carlo method A method of computer simulation that allows scientists to assess probable outcomes of experiments or events. The method employs repeated simulations of an event using actual data, where known, and providing probable values of unknown data. Probable values of unknown data are selected anew for each simulation by a random number generator. Based on the Metropolis Algorithm (1946).
MORSE-CG Multipurpose neutron and photon transport code.
MORTRAN A FORTRAN precompiler.
MOS Metal On Silicon.
MOSG Maintenance Operations Support Group. A SLAC operational group.
MOSS Microsoft Office Sharepoint Server 2007.
MOST Ministry of Sciences & Technology. (China).
MOT MagnetOptic Trap. A combination of laser cooling using a web of laser beams and magnetic cooling using a web of magnetic fields. The web of laser beams cools atoms by bombarding them from many directions, and the web of magnetic fields induces evaporative cooling by encouraging warmer atoms to depart. Cooler atoms coalesce in the trap to form a Bose-Einstein condensate (BEC).
Motif A GUI based on X Windows and distributed by the Open Software Foundation.
Motorola Emitter Coupled Logic See MECL.
MOU Memorandum of Understanding. Used by CDHS to formalize agreement between themselves and local programs with regard to enforcement of the HWCL.
MOX Mixed-Oxide Fuels.
MP Melting Point. The temperature at which the solid and liquid forms of a substance exist in equilibrium.
Mpc megaparsec. One million parsecs.
MPDC Multi-Purpose Data Center.
MPE Maximum Permissible Exposure.
MPF Microlensing Planet Finder. (Proposed)
MPG Master Pattern Generator. See also MP00.
MPGD Micro-Pattern Gas Detector.
MPIfR Max-Planck-Institut fur Radioastronomie.
MPP Massively Parallel Processors. For example, IBM's 9076 SP1, Thinking Machines' CM-2, and Intel's Touchstone Gamma computers.
MPPC Multi-Pixel Photon Counter.
mppcf Millions of particles per cubic foot of air.
MPRSA Marine Protection, Research, and Sanctuaries Act. (Federal)
MPS MultiParticle Spectrometer (BNL).
MPS Machine Protection System. A system to protect the machine from damage from the beam. It uses ionization chambers, current monitors, temperature detectors, and microswitches on valves and other obstructions to rate-limit or turn off the beam whenever necessary.
MPS2 MultiParticle Spectrometer upgrade (BNL).
MPSF MultiParticle Spectrometer at Fermilab.
MPWA Model-dependent Partial-Wave Analysis
MQCD M theory QCD
mQs Millicharged particles
MR Main Ring
MRCOFFEE Multi-Resolution "Cookiebox" Optimized for the Future of Free-Electron (laser) Experiments
MRD Monthly Reporting Database. (SLAC)
MRE
Meal, Ready-to-Eat (U.S. Government)
Mrem Milli Rad Equivalent Man.
MRFM Magnetic Resonance Force Microscopy.
MRI Magnetic Resonance Imaging.
MRL Minimum Reporting Level.
MRS Monitored Retrievable Storage.
MRS Magnetic Resonance Spectrometer
MRS Materials Research Society.
MRS Metal-Resistive layer-Silicon photodetector
MRST Martin-Roberts-Stirling-Thorne
MS Member States (CERN).
MS Minimal Subtraction
MS Manual Station. A manually activated fire alarm sensor.
MS Management Systems
MSAM Medium Scale Anisotropy Measurement
MSD Materials Science Division (SSRL)
MSDS Material Safety Data Sheet. An industry standard form used for listing and describing hazardous chemicals. Named changed to Safety Data Sheet (SDS).
MSE Materials Sciences and Engineering Division (DOE)
MSG Mechanical Services and maintenance Group. (SSRL)
MSGC MicroStrip Gas Chamber.
MSHA Mine Safety and Health Administration.
MSI MicroSoft Installer.
MSI Minority Serving Institution
MSIS Management Systems Improvement Strategy.
MSL Multilayer Soft Lithography.
MSL Mars Science Laboratory. (NASA)
MSM Minimal Standard Model
MSO Management System Owner.
MSPB Merit Systems Protection Board.
MSPs MilliSecond Pulsars.
MSSM Minimal Supersymmetric Standard Model
MSTR MicroSTRategy (software).
MSW Mikheev-Smirnov-Wolfenstein
MT Magic Tee.
MTA Message Transfer Agent. An OSI application process used to store and forward messages in the X.400 Message Handling System. Equivalent to an Internet mail agent.
MTB Materials Transportation Bureau. A subdivision of DOT.
MTBF Mean Time Between Failures. Average time a device will function before failing.
mTCA micro Telecommunications Computing Architecture.
MTEU Master Terminal Expander Unit. A fire alarm chassis from LARSE.
M-Theory Posits that the strong-coupling behavior of supersymmetric string theories and field theories is governed by a web of dualities relating the different theories. This web is called M for magic, mystery, and / or membrane.
MTL Main Test Level.
MTTF Mean Time To Failure.
MTTR Mean Time to Recovery
MTU Maximum Transmission Unit. The largest possible unit of data that can be sent on a given physical medium. For example, the MTU of Ethernet is 1500 bytes.
MTU Master Terminal Unit. A fire alarm chassis from LARSE.
MU Mechanical Utilities.
Mu2e Muon to electron conversion experiment. (Fermilab)
Multiknob See MKB.
Multiple Clip A PPS locking device which allows multiple users to lock a breaker in order to service some piece of equipment. This ensures that no one will energize the breaker while another group is still working on the equipment it powers. All locks on the multiple clip must be removed before the breaker can be energized.
Multiplex The division of a single transmission medium into multiple logical channels supporting many apparently simultaneous sessions.
Muon A lepton with the same charge as the electron, but with mass 210 times larger, and a lifetime of 2.2 microseconds. Because muons interact only electromagnetically, they are very penetrating. Shielding the detector from spurious muon radiation requires massive shielding. Muons were discovered in cosmic rays by C. F. Powell at Bristol in 1947.
MUSYC MUltiwavelength Survey by Yale and Chile.
Mutagenic Capable of causing changes in the genetic code by altering DNA.
Mutate To bring about a change in the genetic constitution of a cell by altering its DNA. In turn, "mutagenesis" is any process by which cells are mutated.
MV McLerran-Venugopalan
MVC Model View Controller.
MW MegaWatt
MWA Management Walk-Around (SLAC)
MWH MegaWatt-Hours.
MWPC MultiWire Proportional Chamber.
MWTC Multiscale Walking TechniColor
MXL The name of a cerberus pyrotronics control panel. The term is also used at SLAC to designate the fire detection system.
MYRRHA Multipurpose hYbrid Research Reactor for High-tech Applications. ( Planned facility in Belgium)
