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SLACspeak Terms

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V.32, V.32bis, V.42, V.42bis
CCITT-based standards for modem communication. V.32 covers speeds up to 9,600 bps. V.32bis covers modem communication at speeds up to 14,400 bps. V.42 covers error correction by V.32- compliant modems. V.42bis covers data compression by V.32- compliant modems.
VAC
VACuum Group.
VAC
Volts Alternation Current
VACG
VACuum Gauge.
VACT
Value ACTual. Equivalent to BACT for devices other than magnets that use DAC / SAM control and read-back.
Vadose Zone
See Unsaturated Zone.
Valiant Little Terminal
See VLT.
Value Actual
See VACT.
VAP
Vector Axial-vector Pseudoscalar
VAP
Vendor-Acquired Property.
Vapor
A gaseous form of a liquid or a solid, such as water vapor.
Vapor Density
The ratio of the density of a vapor to the density of air.
Vapor Pressure
The pressure exerted by a vapor against the sides of a closed container. It is temperature dependent.
VAR
Voltage Amp Reactive
Variable Voltage Substation
See VVS.
Variance
Government permission for a delay or exception in the application of a given law, ordinance, or regulation.
VAT Valve
A type of vacuum valve. VAT is the brand name of this fully closing valve. Vat valves are also called `Slow Valves.'
VATLY
Vietnam Auger Training LaboratorY.
VAX
Virtual Access computer made by Digital Equipment Corporation.
VAX CAMAC Channel
See VCC.
VAX SLCNET Channel
See VSC.
VB
Vertical Bend.
VBA
Very Big Accelerator.
VBF
Vector Boson Fusion.
VC
|An identifier that permits all Transfer Frames that are members of a given sequence to be uniquely identified. It permits multiple user data types to be multiplexed together so that they may share the finite capacity of the sin| |gle physical space data channel.|
  Glast Category: operations
VC
Vertex Chamber.
VCAM
Video Cable Access Module. A CAMAC module which can be programmed to multiplex any one out of eight video signals from cameras and to transfer that signal to one of five possible CATV channels. It multiplexes the video signals used by the operators at MCC.
VCC
VAX CAMAC Channel. A chassis which interfaces the VAX unibus DMA system to the CAMAC system.
VCHP
|Used to achieve temperature control by blocking a fraction of the condenser with a small amount of non-condensable gas. As condenser temperature increases, heat pipe temperature rises, vapor pressure is increased and more conde| |nser area is exposed, increasing heat pipe conductance. The effect is reversed as condenser temperature decreases, thereby maintaining a nearly constant heat pipe operating temperature over a wide range of heat inputs and condenser thermal| | environments.|
  Glast Category: FSW, hardware, spacecraft
VCO
A chassis used to vary the damping ring frequency.
VCO
Voltage Controlled Oscillator.
VCS
Virtual Compton Scattering
VC3
|The frames in the LAT's telemetry data stream containing the stored housekeeping (HSK), diagnostic, and alert data read from the HSK partition of the Spacecraft's Solid State Recorder.|
  Glast Category: operations, spacecraft
VD
Volume Damper
VDC
Volts Direct Current
VDCI
Video Digitizer Clock Interface. A CAMAC module.
VDI
Voluntary Disability Insturance.
VDS
Vertex Detector System. (Mark II)
VDST
Video Distribution SysTem. A VAX primary.
VDT
Video Display Terminal.
VDU
Vernier Delay Unit. Allows 0-10 nsec of time delay for a NIM trigger.
VE
Value Engineering.
VEC
Volitional Engineering Controls. (ES&H)
VECC
Variable Energy Cyclotron Centre (Calcutta)
VEF
Vietnam Education Foundation. (US)
VELO
VErtex LOcator. (LHCb)
VEP
Violations of the Equivalence Principle
VEPP
See NOVO VEPP
VERITAS
Very Energetic Radiation Imaging Telescope Array. Cherenkov telescope project under construction in the Arizona, US.
Vernier Delay Unit
See VDU.
Versaterm
A file transfer and communication protocol for using a MAC or a PC as a terminal. Versaterm is a commercial communication program for interfacing PCs to mainframes.
Very High Frequency
See VHF.
VES
Vertex Spectrometer Facility at 70 GeV IHEP accelerator.
VETO
A CAMAC module that receives fault information and sends it to micros in order to flag corrupted data to BPMPs or other detectors. The klystron veto system provides a fast signal to all micros that a klystron has missed firing on a beam pulse. Originally designed to gate the experimenter's detection equipment off on pulses that are of the wrong energy due to a misfiring klystron.
VGC
Vacuum Gauge Controller. Monitors vacuum at every klystron/ modulator. Interrupts trigger to modulator when klystron vacuum is bad.
VHAP
Volatile Hazardous Air Pollutant.
VHC
Vaden Health Center. (Stanford)
VHE
Very High-Energy
VHF
Very High Frequency. Allocated band of radio frequencies from 30 Megahertz (MHz) to 300 MHz.
VHRA
Very High Radiation Area.
vi
Visual Interface. Developed by Bill Joy, vi became the de facto standard UNIX editor until the rise of EMACS after 1984. It is still widely used.
Video Cable Access Module
See VCAM.
Video Digitizer Clock Interface
See VDCI.
Video Distribution System
See VDST.
VIDMAN
Virtuelle Institut für Dunkle MAterie und Neutrinophysik. (dark matter and neutrino physics)
VIKHOS
Virtuelles Institut für Hochenergiestrahlungen aus dem KOSmos . (high-energy radiation from the cosmos)
VIPAC
Virtual Institute for PArticle Cosmology.
VIPER
VIsualization for PingER.
VIRGO
a Michelson laser interferometer.
Virtual Machine
See VM.
Virtual Machine/Conversational Monitor System
See VM/CMS.
Virtual Memory System
See VMS.
virus
A program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. Most viruses can also replicate themselves. All computer viruses are manmade. A simple virus that can make a copy of itself over and over again is relatively easy to produce. Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt. An even more dangerous type of virus is one capable of transmitting itself across networks and bypassing security systems.
VIRUS
Visible Integral-field Replicable Unit Spectrograph.
VISA
Visible to Infrared SASE Amplifier.
VIWG
Vertical Integration Working Group (ES&H).
VLA
Very Large Array.
VLAM
Vertical LAMbertson. See Septum.
VLBA
Very Long Baseline Antenna (Arizona).
VLHC
Very Large Hadron Collider. A facility, now in the planning stages, to collide beams of protons and antiprotons with energies of 50 - 100 TeV per beam.
VLI
Violations of Lorentz Invariance
VLK
Very Large Key (LCLS).
VLM
Very Low Mass
VLPC
Visible Light Photon Counter
VLQ
Very Low Q**2.
VLSI
Very Large-Scale Integration.
VLSP
Virtual Lightest Supersymmetric Particle
VLT
Valiant Little Terminal. A terminal emulation program for the Amiga.
VLT
Very Large Telescope. (Chile)
VLT
Visible Light Transmission. The amount of visible light passing th rough a filter, weighted for the response of the human eye, expres sed as a percentage.
VM
Virtual Machine. Refers to the operating system on the IBM 3081 or 3270. (Phased out at SLAC in 1997.)
VM
Virtual Memory.
VM/CMS
Virtual Machine/Conversational Monitor System. IBM main interactive timesharing system.
VMD
Vector Meson Dominance
VME
Versa Module Eurocard. A computer architecture. The VMEbus is a standard of industry used in data acquisition in detectors (BaBar) and controls for the accelerator (feedback system)
VMI
Velocity Map Imaging spectrometer.
VMO
Very Massive Objects
VMS
Virtual Memory System. DEC's designation for the VAX operating system.
VO
Vacuum oscillations
VOC
Volatile Organic Compounds.
Volatilization
Vaporizing or evaporating quickly. Volatalization rate is a function of turbulence, temperature, and vapor pressure of the liquid.
VPP-ISMS
Voluntary Protection Program - Integrated Safety Management System .
VRVS
Virtual Room Videoconferencing System.
VSC
VAX SLCNET Channel. Refers usually to the interface circuit and firmware (the VSC box) between the VAX and the SLCNET.
VSC
|An integrated set of hardware and software, developed at SLAC, that simulates all GLAST interfaces with the LAT (command and telemetry bus, science data interface, GBM signals, etc). VSC units were used extensively throughout t| |he LAT integration and test effort. They continue to be used in the LAT Dataflow Lab to command and monitor LAT teststands.|
  Glast Category: FSW, hardware, software, spacecraft
VSE
Vision for Space Exploration. (NASA)
VSED
Vacuum Science and Engineering Department.
VSFT
Vacuum String Field Theory.
VT
Video Terminal. See VDT.
VTK
Visualization Tool Kit.
VTR
Vent Thru Roof
VT100
A type of computer terminal made by Digital Equipment Corporation. Many terminals emulate VT100 to be compatible with servers and software. Macs and PCs can also emulate VT100.
VUV
Vacuum UltraViolet.
VVC
Virtual Visitors Center
VVDZ
Van Dam-Veltman-Zakharov.
VVS
Variable Voltage Substation. The AC power supplies for the klystron modulators in the LINAC. Each VVS feeds two sectors of the LINAC. They are remotely controlled to provide from three to six hundred volts to the modulator power supplies. Also called Var iable Voltage Sources.
VXD
VerteX Detector.

Send corrections to jmdeken@slac.stanford.edu or propose new terms for SLACspeak.

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