Preliminary site plan for SLAC, 1962
Legacy SLACspeak

Historic terms:

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Legacy SLACspeak M

M-2     Mark II Experiment.

M-3     Mark III Experiment.

MAC     MAgnetic Calorimeter detector at PEP/SLAC

MAC     Minority Affairs Committee.

MAC     CALF A Macintosh computer used as a terminal on the VAX control system. See also CALF.

macropackage     A collection of TeX macros, or definitions, that are used as a group to typeset documents following the guidelines of a specific page layout or style.

Magnetic Fusion Energy Network     See MFENET.

Main AG     The power supply, Main Alternating Gradient, that drives the 920 bend magnets of the SLC arcs.

MARK     Name given to several generations of both accelerators and detectors created and used at HEPL and at SLAC. (See

MARK I     A famous SLAC experimental detector, used to discover the PSI particle and the tau lepton at SPEAR in the mid 1970s.

MARK II     First used at SPEAR as a replacement for the MARK I detector, this SLAC experimental detector was then used in region 12 of PEP during the 1980's, and again used as the SLC primary detector until November of 1990. See also MARK I.

MARK III     An experimental detector used at SPEAR after Mark II.

Massimo      Massimo Criteria are the orbit positions at the back end of each ARC, where the beams pass through the centers of the small- aperture fixed collimators at the entrance of the FF. The x and y orbit values are usually posted near COW 3 in MCC and in the FF SLC TODAY book. Named after Massimo Placidi, a CERN physicist who assisted in commissioning the SLC final focus. 

MAT     An abbreviation for MATLAB used in VAX terminology for a type of mathematical problem solving file : ` File.Mat.'

MBCD     MultiBus CAMAC Driver. A Micro circuit card used to interface with CAMAC crates.

MCC     Main Control Center. The building (Bldg 005) from which the accelerator is operated. Also, the actual control room within that building.

MCD     Mechanical Component Design group (at SLAC)

MCR     Main Control Room.

MEL-FS     Multiprogram Energy Laboratory - Facilities Support.

MESSENGER     MErcury Surface, Space ENvironment, GEochemistry, and Ranging mission.

Mezzanine     The name of the Collider Hall second floor.

MIC     Monolithic Integrated Circuit.

MICE     Muon Ionization Cooling Experiment (RAL)

MICOM     A Switching box to manage broadband communications between terminals (via the servers) to the VAXes, the IBM 3270 and the Ethernet network. A terminal which is serviced by the `MICOMswitch' can be used on any of the SLAC site's main computers.

Micro      Microcomputer. The SLC system includes about 70 microcomputers with 8086 or 80386 multitasking CPUs. Most micros are used to a) drive CAMAC crates which in turn control accelerator devices and instrumentation, b) perform standardization algorithms for magnets, and c) communicate with the VAX by either receiving instructions or returning information for monitoring and display purposes.

Microcomputer     See Micro.

Midas     See MidasWWW.

MidasWWW     The first fully-functional X-window GUI browser for the World Wide Web, written by Tony Johnson at SLAC. It features a multifont hypertext display, source code viewer, Motif Style Guide compatibility, and runs under UNIX and VMS. MidasWWW strongly influenced the subsequent development of the Mosaic and Netscape Navigator browsers.

MILAGRO     Gamma Ray observatory at Fenton Hill, New Mexico.

Mini Sam     Small Angle Monitor, used to detect Bhabha-scattered electrons in the Mark II detector.

MINOS     Main Injector Neutrino Oscillation Search (at Fermilab)

MINUIT     A FORTRAN numerical minimization program written by Fred James (CERN) in the 1970s.

Missing Pulse     See FIDO.

MK-II     MARK II Detector. The first SLC detector, replaced at the SLC by the SLD. See MARK II.

MKS MKSU Protect     A klystron summary display status indicating that the MKSU went into `protect mode.'

MKSU     Modulator Klystron Support Unit.

MKSU Protect     See MKS.

MKT MKSU Trigger Enable Fault     A klystron summary display indicating an interlock fault that causes inhibition of the modulator firing triggers.

MNT MaiNTenance     A klystron summary display message. In maintenance mode the klystron may be run locally. This is accomplished by triggering the unit at a time when there is no beam present.

MOAN     Modern Offline Analysis Nexus.(MARKIII)

MOD     MODulator. A klystron summary display message indicating a modulator interlock fault. Each klystron is powered by a modulator that produces accurately-timed high-voltage pulses of the proper width (3.5 micro sec), amplitude and polarity, to pulse the klystron tubes. Modulators can pass 4000 A peak current, and are triggered at multiples (and sub-multiples) of 60hz by the MTG. When we speak of `triggering a klystron,' we actually mean we are triggering its modulator.

MODEM     MOdulator-DEModulator. A device or program that enables a computer to transmit data over telephone lines.

MODulator     See MOD.

MORE     Microwave Oil Recovery Experiments.

MORSE     Multigroup Oak Ridge Stochastic Experiment.

Mosaic     A mouse-driven interface to the World Wide Web (WWW) developed by NCSA. (See also MidasWWW)

Mover     A stepping motor used to move a magnet with respect to the beam. The beam steering in the SLC arcs is done with magnet movers instead of the more conventional `trim winding' method.

MP00     Master Pattern generator zero. A microprocessor in MCC that generates the PPYY signals.

MRK1     See Mark-I

MRK2     See Mark-II

MRK3     See Mark-III

MRKJ     Mark-J detector at DESY

MTF     Memorandum-To-File.

MTG     Master Trigger Generator. Located in CID, this unit synchronizes the fiducial with respect to PG&E and the damping rings.

MTI     Multispectral Thermal Imager

Multibus     A backplane crate system similar to CAMAC or NIM designed to hold modules. SLC micros use a multibus system.

Multibus CAMAC Driver     See MBCD.

MURA     Midwestern University Research Association. Group working on high energy proton machine in the 1950's. Donald Kerst, Director, 1956 .

MUSASHI     Monoenergetic Ultra-Slow Antiproton Source for High-Precision Investigations, a group of the ASACUSA collaboration.

MUX     An abbreviation for Multiplexer.

MWC     Minority and Women's Committee.