- L
- Large, Long (abbreviation used in SLAC drawings)
- L&EO
- |The launch and initial checkout period of up to 60 days,
during which the GLAST spacecraft, GBM, and LAT are brought up to
full operating status and verified. The end of L&EO is the hand-
off of the GLAST from General Dynamics t|
|o NASA.|
Glast Category: operations
- LA
- License Application.
- LA
- Liquid Argon.
- LAA
- Lepton Asymmetry Analyzer.
- LAA
- Local Administering Agency. (CH&SC Sec. 25500 et seq)
- LABELIT-CCI
- Data characterization software for macromolecular
crystallography.
- LABL
- Serial number or other label for a magnet.
- LABRADOR
- Large Analog Bandwidth Recorder And Digitizer with Ordered
Readout .
- LAC
- Liquid Argon Calorimeter. A SLD detector system. See also
Calorimeter.
- LAD
- License Application Design.
- LAER
- Lowest Achievable Emission Rate. (from CAA)
- LAL
- Laboratoire de L'Acc'el'rateur Lineare. (Orsay)
- LAM
- Look At Me! A Handshaking protocol between digital
electronic systems.
- LAMA
- Library Administration and Management Association.
- Lambda CDM
- Lambda Cold Dark Matter. The leading modern cospological
model.
- Lambertson
- A type of septum magnet named after Glen Lambertson of LBNL.
It is used to extract the beam from the LINAC to the positron
target. See also HLAM.
- LAMP
- LCLS-ASG-Michigan Project for novel science with the LCLS
FEL.
- LAMPF
- Los Alamos Meson/Proton Factory (1460 MeV/c Plab).
- LAN
- Local Area Network. Any physical network technology that
operates at high speed over short distances (up to a few thousand
meters).
- Land Ban
- Informal name for Land Disposal Restricted (LDR).
- Landau Damping
- Obsolete. See BNS Damping.
- Landfarming
- A treatment technique which involves spreading waste on land
and utilizing evaporation and microbial action to degrade the
wastes. Used primarily for crude oil wastes. It is not the same
as landfilling.
- LANL
- Los Alamos National Laboratory, home of the LANL eprint
archives at http://xxx.lanl.gov.
- LAPP
- Laboratoire d'Annency-L
- LAR
- Large Adaptive Reflectors.
- LAr TPC
- Liquid Argonne Time Projection Chamber.
- Large Power Supply
- See LGPS.
- LARP
- LHC Accelerator Research Program. (US)
- Larse
- A brand name for a general purpose alarm system chassis used
at SLAC for monitoring fire alarms.
- Laser
- Light Amplification by Stimulated Emission of radiation. A
device that uses the principle of amplification of
electromagnetic waves by stimulated emission of radiation and
operates in the infrared, visible, or ultraviolet region.
- Laser Cavity Shutter
- See LCS.
- Laser Feedback Intensity Control
- See LFIC.
- Laser Safety Officer
- See LSO.
- Laser Safety Stopper
- See LSS.
- Laser-wire
- A high-powered laser beam focused down to the smallest spot
possible and used in the SLC to measure the size of the
interaction point. The SLC laser-wire, commissioned in July,
1996, replaces conventional wire measures, which break apart from
thermal shock at high beam intensities.
- LASS
- Large Aperture Superconducting Solenoid spectrometer at
SLAC. A decommissioned ESB experiment.
- LASS
- LASer analyzing Station. A B-line apparatus.
- LAST
- Life, Art, Science, Tech festival
- LAT
- Local Area Transport.
- LAT
- Large Array Telescope (GLAST).
- LAT
- A Gamma-ray telescope designed to measure the energy and
direction of Gamma-rays incident from space with energies from
about 20 MeV to greater than 300 GeV. Objectives include: the
study of the mechanisms of particle acceler ation in
astrophysical environments: study of AGN, pulsars, and supernova
remnants: the resolution of unidentified galactic sources and
diffuse emissions from cosmological sources: and the
determination of high-energy behavior of GRBs and transient
sources. Main components include a silicon-strip track detector,
a calorimeter, an anti-coincidence detector, and a data
acquisition system.
Glast Category: hardware
- LATC
- Package that provides a framework for controlling
configuration of the LAT's detector electronics. In flight, LATC
reads configuration parameters from binary files stored in EEPROM
and manages the internal LAT network comman d sequences needed to
set hardware registers to the specified state.
Glast Category: FSW, package
- LATOR
- Laser Astrometric Test of Relativity.
- Lattice
- A repeating pattern of magnets.
- Launch Knob
- A multiknob using a set of correctors to launch beam in the
LTRs, the Rings or other sections of the machine. The knobs are
orthogonalized to give independent control of position and angle
at a given reference point.
- LAVC
- Local Area VAX Cluster.
- LBL
- see LBNL
- LBL
- Low-energy cut-off BL Lac object.
- LBNE
- Long-Baseline Neutrino Experiment. (FermiLab)
- LBNF
- Long-Baseline Neutrino Facility.
- LBNL
- Lawrence Berkeley National Laboratory, CA. Full name of lab
is Ernest Orlando Lawrence Berkeley National Laboratory.
- LC
- Linear Collider.
- LC
- Liquid Crystal.
- LCA
- Laser Controlled Area.
- LCA
- Labor Condition Application.
- LCAT
- Package containing tools for defining the structure of CCSDS
command and telemetry packets consumed and issued by FSW systems.
Glast Category: FSW, package
- LCB
- Lat Communications Board.
- LCBD
- Package providing driver software to control each CPU's LAT
Communications Board. The LCBD driver controls how internal
commands are sent between CPUs, and how commands are sent from
the Spacecraft Interface Unit to the LAT electronics. The LCBD
driver also handles event data packets as they are delivered by
the hardware.
Glast Category: FSW, package
- LCC
- Linear Collider Collaboration. A collaboration between SLAC
and KEK to define common parameters for a TeV center-of-mass
energy linear collider.
- LCCA
- Life Cycle Cost Analysis.
- LCD
- Liquid Crystal Display.
- LCD
- Linear Collider Detector.
- LCDG4
- GEANT4-based flexible full-detector simulation program.
- LCFI
- Linear Collider Flavour Identification Project (ILC).
- LCFOA
- Linear Collider Forum Of America (ILC).
- LCFT
- Logarithmic Conformal Field Theory.
- LCG
- LHC Computing Grid.
- LCHb
- An experiment at the Large Hadron Collider (LHC) to study in
detail the physics of the 'b' or 'beauty' quark.
- LCI
- Package used by operators to inject charge into the LAT
front-end electronics. Data resulting from this procedure are
used on the ground to calibrate the front-ends.
Glast Category: FSW, package
- LCID
- Linac CID.
- LCIO
- Linear Collider Input/Output.
- LClo
- Lethal concentration low. The lowest concentration of a
substance in air which has been reported to have caused death in
humans or animals.
- LCLS
- Linac Coherent Light Source. A linac-based X-ray free-
electron laser at SLAC.
- LCM
- Package installed on each CPU that allows operators to
collect CPU diagnostic data, dump FSW task and module listings,
and set low-level FSW behavior.
Glast Category: FSW, package
- LCPC
- Laboratory Computer Policy Committee
- LCS
- Laser Cavity Shutter. A PPS device used to stop the PLS
laser whenever the laser room door is opened.
- LCS
- Package in the FSW abstract communications layer that
controls how data packets received and sent via the LAT
Communications Board driver are routed to FSW tasks.
Glast Category: FSW, package
- LCS
- Laser Compton Scattering.
- LCSGA
- Linear Collider Steering Group of the Americas.
- LCSR
- Light Cone Sum Rules.
- LCTPC
- Linear Collider Time Projection Chamber collaboration.
- LCUK
- Linear Collider collaboration - United Kingdom (ILC).
- LCW
- Low Conductivity Water. Used for cooling magnets, electrical
cables and other devices where normal water could cause a short
under high voltage. LCW is manufactured by deionizing `house'
water at a plant on the SLAC project.
- LCWS
- Linear Collider WorkShop.
- LDA
- Large Aperture Dipoles.
- LDA
- Local Density Approximation.
- LDAP
- Lightweight Directory Access Protocol.
- LDC
- Large Detector Concept for the ILC.
- LDlo
- Lethal dose low. The lowest dose of a substance introduced
by any route other than inhalation which has been reported to
have caused death in humans or animals.
- LDR
- Land Disposal Restricted (Land Ban).
- LDRD
- Laboratory Directed Research and Development. A program to
direct the Laboratory's scientific research capabilities toward
vital and emerging scientific challenges that align with the
Laboratory's current mission.
- LD50
- Lethal Dose Fifty. A calculated dose of a substance which is
expected to cause the death of 50 percent of an entire defined
experimental animal population.
- LEA
- Local Enforcement Agency (for solid waste in California).
- LEACH
- Local Electronics And Cryogenics Housing.
- Leachate
- A solution of contaminants produced by water flowing through
materials such as organic matter, soil, or landfills.
- Lead (Pb)
- Used extensively at accelerator facilities to shield
equipment and personnel from electromagnetic radiation. A heavy
metal that is hazardous to health if breathed or swallowed. Its
use in gasoline, paints, and plumbing compounds has been sharply
restricted or eliminated by federal laws and regulations. See
also Heavy Metals.
- LEAP
- Low Energy Antiproton Physics, a biennial international
conference .
- LEAPS
- League of European Accelerator-based Photon Sources.
- LEAR
- Low Energy Antiproton Ring (CERN)
- LEB
- Low Energy Beam.
- LEBC
- Little European Bubble Chamber (CERN)
- LEBT
- Low-Energy Beam Transport
- LeCosPA
- Leung center for Cosmology and Particle
Astrophysics.(Taiwan)
- LECT
- Liquid Effluent Cooling Tank.
- LED
- Light Emitting Diode.
- LEE
- Low Energy Extraction.
- LEED
- Low Energy Electron Diffraction, a popular surface-imaging
technique.
- LEED
- Leadership in Energy and Environmental Design (certification
from USGBC).
- Leed-NC
- Leed - New construction.
- LEEM
- Low-Energy Electron Microscope.
- LEEP
- Laboratory Electronics Equipment Pool.
- LEET
- Large Energy Effective Theory.
- LEFF
- The effective length of a magnet in meters. A SLC VAX
database secondary.
- LEIR
- Low-Energy Ion Ring (CERN), formerly LEAR.
- LEL
- Lower Explosive Limit or Lower Flammable Limit (LFL). By
percentage, the lowest concentration of a substance in air which
will ignite. Compare UEL and flammability range.
- LEM
- Linac Energy Management. A VAX procedure used to adjust the
LINAC quadrupole focusing strengths to match the changing beam
energy profile. The beam energy varies as klystrons trip off, or
their phases are changed.
- Lemming
- An operator action which consists of adjusting the LINAC
quads to the actual energy of the beam using the LEM procedure.
The computer ascertains the beam energy at each quadrupole from
the phases of the klystrons to that point, and then adjusts the
current in each quadrupole for that calculated energy.
- LENA
- Nonmagnetic lead-glass NaI detector at DORIS.
- LENS
- A solenoidal focusing magnet.
- Lens
- Any focusing element.
- LEO
- |Also known as L&EO. The launch and initial checkout period
of up to 60 days, during which the GLAST spacecraft, GBM, and LAT
are brought up to full operating status and verified. The end of
L&EO is the hand-off of GLAST from Ge|
|neral Dynamics to NASA.|
Glast Category: operations
- LEP
- Large Electron Positron collider (CERN).
- LEPC
- Local Emergency Planning Committee. (from EPCRA)
- LER
- Low Energy Ring in PEP-II, a 3.1 Gev storage ring for
positrons.
- LESIT
- LEistungselektronic, Systemtechnik und
InformationsTechnologie.
- LESIT
- Low Energy South Injection Transport.
- LESR
- Laser-Electron Storage Ring
- LET
- Low Energy Theorem
- Lethal Concentration Low
- See LClo.
- Lethal Dose Fifty
- See LD50.
- Lethal Dose Low
- See LDlo.
- LEUTL
- Low Energy Undulator Test Line (APS-Argonne).
- Level 0 processing
- Processing of level 0 data delivered by the MOC into a form
which can be displayed and trended (e.g., LAT housekeeping data)
or injected into the Level 1 processing pipeline (LAT science
data). Consists of rece iving and unpacking MOC Level 0 transfer
packages, storing LAT telemetry packets on disk and logging their
arrival, and (for science data) reassembling a merged set of
event data from all EPUs that can be fed into the data processing
pipeline.
Glast Category: data processing
- Level 1 processing
- Processing of level 0 data into level 1 data. Consists of
creation of a database of reconstructed Gamma-ray and cosmic ray
events.
Glast Category: data processing
- LFD
- Light Front Dynamics
- LFIC
- Laser Feedback Intensity Control. A feedback system designed
to compensate for the loss in laser light intensity of the PLS.
- LFL
- See LEL.
- LFO
- Laboratory Financial Operations.
- LFS
- Package for managing the onboard EEPROM file system:
allowing operators to upload and delete files, create and delete
file directories, dump file contents into telemetry, diagnose the
file system, etc.
Glast Category: FSW, package
- LFTD
- Light Front Tamm-Dancoff
- LFV
- Lepton-Flavor-Violating/Violation.
- LGO
- Lunar Geoscience Orbiter.
- LGPS
- LarGe Power Supply. A database primary. Each LGPS is
controlled by a CAMAC module (PSC).
- LGT
- Lattice Gauge Theories
- LHC
- Large Hadron Collider (CERN).
- LHCb
- Large Hadron Collider beauty experiment. (CERN)
- LHK
- Package that streams hardware and software health and safety
and low-rate science data into telemetry: also allows operators
to define red limit engineering thresholds, which - when exceeded
- result in transmission of real-t ime telemetry alerts.
Glast Category: FSW, package
- LHT
- Liquid Hydrogen Targets.
- LHW
- Liquid Hazardous Waste.
- LH2
- Liquid Hydrogen.
- LI
- Abbreviations for Linac.
- LIAR
- LInear Accelerator Research code. Accelerator structure
design software.
- LIARP
- LInear Accelerator Research code Parallel. Accelerator
structure design software.
- LIB
- LIBrary.
- LIC
- Line Item Construction.
- Lichtenberg tree
- Or Lichtenberg Diagram. See Beam Tree.
- LIDAR
- LIght Detection And Ranging
- LIGO
- Laser Interferometer Gravitional-wave Observatory
- LIL
- Linac Injecteur de LEP.
- LIM
- Package that controls the LAT's operating mode and manages
both commanded and automatic mode changes: also ensures that the
LAT detector and FSW maintain a proper state as mode changes
occur.
Glast Category: FSW, package
- LIN
- Abbreviation for Linac.
- LINAC
- LINear ACcelerator. A type of particle accelerator in which
charged particles are accelerated in a straight line, either by a
steady electrical field or by means of radio frequency electric
fields. In the latter variety, the passage of the particle is
synchronized with the phase of the accelerating field. The SLAC
LINAC is a two-mile long accelerator, consisting of cylindrical,
disc loaded, copper waveguides placed on concrete girders in a
tunnel about 25 feet underground.
- LINAC Energy Management
- See LEM.
- LINE
- An Interactive Graphics Program.
- Linear Accelerator
- See LINAC.
- Linear Charge Detector
- See LINQ.
- Linear Variable Differential Transformer
- See LVDT.
- LINQ
- Linear Charge Detector, usually a toroid. `Q' is the
physical symbol for electrical charge.
- Linux
- A freely-distributable implementation of UNIX that runs on a
number of hanrware platforms. It was originally developed by
Linus Torvalds.
- LION
- Long IONization Chamber
- Liouville's Theorem
- The mathematical support to the notion that the area in
phase space (emittance) occupied by accelerated particles is
constant.
- Liquid Argon Calorimeter
- See LAC.
- LIRIC
- Linac Improvement and Reliability Investigation Committee.
- LISA
- Laser Interferometer Space Antenna
- LISOC
- |Please refer to ISOC, the preferred acronym for the LAT
Instrument Science Operations Center._|
Glast Category: organization
URL: http://glast-isoc.slac.stanford.edu/
- LISP
- LISt Processor. A high-level programming language popular
for artificial intelligence applications. LISP was developed in
the early 1960's by John McCarthy at MIT.
- List
- Shorthand term for EPA list of violating facilities or list
of firms debarred from obtaining government contracts because
they violated certain sections of the Clean Air or Clean Water
Acts. The list is maintained by the Office of Enforcement and
Compliance Monitoring.
- Listed Waste
- Wastes listed as hazardous under RCRA but which have not
been subjected to the Toxic Characteristics Listing Process
because the dangers they present are considered self-evident.
- LITA
- Library and Information Technology Association.
- Little-endian
- A format for storage or transmission of binary data in which
the least significant byte or bit comes first. See big-endian.
- LLD
- Lower Limit of Detection.
- LLL
- See LLNL.
- LLMW
- Low Level Mixed Waste.
- LLNL
- Lawrence Livermore National Laboratory.
- LLO
- LIGO Livingston Observatory.
- LLP
- Long-Lead Procurement.
- LLR
- Lunar Laser Ranging.
- LLRF
- Low Level Radio Frequency. Also called low level RF.
Pertains to c ontrolling the phase and amplitude of RF signals at
low power leve ls, before they are amplified to high power
levels.
- LLRW
- Low-Level Radioactive Waste (ESH)
- LLS
- Synchrotron Light Laboratory (Spain).
- LLW
- Low-Level Waste (ESH)
- LMA
- Large Mixing Angle.
- LMAC
- LEP Machine Advisory Committee.
- LMC
- Large Magellanic Cloud.
- LMC
- Package allowing operators to request telemetry streams that
contain low-rate science data from the ACD, TKR, and CAL
subsystem electronics.
Glast Category: FSW, package
- LMP
- Lightest Messenger Particle.
- LMS
- Learning Management System. (SLAC)
- LN
- Liquid Nitrogen (tank).
- LNF
- Laboratori Nazionali di Frascati. (INFN)
- LNLS
- Laboratorio Nacional de Luz Sincrotron (Brazil).
- LNS
- INFN Laboratori Nazionali del Sud, Italian laboratory
located in Catania.
- LNW
- Lehmann-Newton-Wu
- LO
- Leading Order.
- LOB
- Laboratory Operations Board.
- LOC
- Level of Concern. (related to EPCRA)
- Local Area Network
- See LAN.
- LODCM
- Large Offset Double Crystal Monochrometer. Also referred to
as LOM (Large Offset Monochrometer).
- LOF
- LAT Operations Facility. (GLAST)
- LOF
- See Instrument Science Operations Center's (ISOC) website.
Glast Category: operations
URL: http://glast-isoc.slac.stanford.edu/
- LOFAR
- Low Frequency ARray.
- LOI
- Letters of Intent. (ILC)
- LOIS
- Loss Of Interim Status.
- LOLA
- S-band transverse deflecting structures. Named for creators
Greg L oew, Rudy Larsen and Otto Altenmueller.
- LOM
- Large Offset Monochrometer.
- Long Ion Chamber
- A BCS type beam line device in use in the FFTB tunnel at
SLAC. They are gas filled tubes running parallel to the beam line
which are able to detect stray beams using the ionization effect.
- Look At Me!
- See LAM.
- LOPA
- Layer Of Protection Analysis.
- LOREA
- angle-resolved photoemission beamline at ALBA.
- LOS
- Laboratory, Office and Shops building (SSRL).
- LOS
- Level Of Service.
- LOS
- |Routine orbital event at which GLAST loses communications
with a TDRSS satellite or with a ground station.
|
Glast Category: operations, spacecraft
- LOS
- LockOut Stop.
- LOSB
- Laboratory, Office and Shops Building (SSRL).
- Lost Phase
- See LST.
- LOTO
- Lock Out / Tag Out.
- Low Conductivity Water
- See LCW.
- Low RF
- See LRF.
- Lower Explosive Limit
- See LEL.
- Lower Flammable Limit
- See LEL.
- LP
- Laboratory Protection, department.
- LPA
- |Package controlling the LAT's core science functions:
collection and filtering of event data: packaging of Gamma-ray,
heavy ion, and minimum ionizing particle event candidates into
science telemetry: detection of GRBs and trans|
|mission of alerts and autonomous repoint requests.|
Glast Category: FSW, package
- LPA
- Large Piwinski Angle.
- LPC
- Laser Pulse Chopper.
- LPC
- LHC Physics Center.(Fermilab)
- LPC
- Laboratory Policy Council.
- LPG
- Liquified Petroleum Gas.
- LPHD
- Local Parton Hadron Duality
- LPL
- Lunar and Planetary Laboratory (University of Arizona).
- LPM
- Landau-Pomeranchuk-Migdal
- LPR
- License Plate Reader.
- LPS
- Leading Proton Spectrometer
- LPS
- Lab Partnering Service (DOE)
- LPSPL
- Low-Power Superconducting Proton Linac.
- LQ
- Long Quadrupole.
- LQCD
- Lattice Quantum ChromoDynamics
- LR
- Long Racetrack.
- LRCA
- Limited Radiological Control Assistant.
- LRDP
- Long-Range Development Plan.
- LRF
- Low RF, A klystron summary display message indicating that
the RF power is lower than its normal tolerance setting.
- LRIS
- Low Resolution Imaging Spectrograph.
- LRP
- Long Range Plan (DOE).
- LRS
- Local Rotational Symmetry
- LRS
- |Data acquisition program of the LAT when passing through
the SAA.|
Glast Category: operations, spacecraft
- LRSM
- Left-Right Symmetric Model.
- LS
- Level Switch.
- LSA
- Low Specific Activity.
- LSBK
- L-Band Sheet Beam Klystron.
- LSC
- Laser Safety Committee.
- LSD
- Lenses Structure and Dynamics.
- LSE
- Laser Stabilization Experiment.
- LSF
- Load-Sharing Facility. (Computing)
- LSH
- Level Switch High.
- LSI
- Large-Scale Integration.
- LSL
- Level Switch Low.
- LSM
- Package that receives timetone, attitude, and 'ancillary'
message packets sent periodically by the Spacecraft, as well as a
once-per-second hardware time signal, from which it constructs
internal tables correlating Spacecr aft time and internal LAT
system time for use by other FSW systems..
Glast Category: FSW, package
- LSND
- Liquid Scintillator Neutrino Detector (Los Alamos).
- LSO
- Laser Safety Officer. A person who has authority to monitor
and enforce the control of laser hazards.
- LSP
- Lightest Supersymmetric Particle.
- LSR
- Local Standard of Rest. (Astronomy)
- LSRA
- Life Science Research Associate.
- LSS
- Laser Safety System. A system of interlocks around a secured
enclosure to protect personnel from laser light.
- LSS
- Large Scale Structure
- LSS
- Lean Six Sigma (process improvement method).
- LSST
- Large Synoptic Survey Telescope.
- LSSTC
- Large Synoptic Survey Telescope Corporation.
- LST
- LoST Phase. A klystron summary status indicating that the
PAD is not able to measure the klystron phase.
- LST
- Limited Streamer Tubes. (BaBar)
- LSZ
- Little String theory.
- LTB
- Lemaitre-Tolman-Bondy
- LTB
- Linac-To-Booster
- LTC
- Package that monitors data collected by thermal sensors on
LAT, executes a control algorithm based on this input, and turns
heaters on and off. LTC is responsible for fine-tuning the
thermal control of the LAT and minimizing thermal distortions.
Glast Category: FSW, package
- LTD
- Low-Temperature Detectors.
- LTDA
- Long-Term Data Access. (BaBar)
- LTE
- Long-Term Exposure (photography)
- LTMR
- Low Temperature Materials Research Group (SLAC)
- LTR
- Linac To Ring.
- LTR
- Low Temperature Materials Research.
- LTR
- Low Temperature Reservoir.
- LTU
- Linac-To-Undulator.
- LTX
- Package providing the framework for unit, functional, and
acceptance testing of LAT Flight Software.
Glast Category: FSW, package
- Lucretia
- A physics toolbox for the simulation of high-performance
single-pa ss electron beam transport systems.
- LUFT
- Leaking Underground Fuel Tank.
- Luminosity
- A measure of the number of events per second and per unit
cross section at the IP.
- LUSI
- LCLS Ultrafast Science Instrument Project.
- LUST
- Leaking Underground Storage Tank.
- LUX
- Large Underground Xenon dark matter experiment.
- LVD
- Large Volume Detector (Gran Sasso)
- LVDT
- Linear Variable Differential Transformer. A device for
measuring positions relative to a fixed reference, (e.g., for
measuring slit positions).
- LVV
- Limited Visibility Vehicle.
- LWC
- Lost Work Cases.
- LWFA
- Laser WakeField Acceleration
- LZ
- LUX-ZEPLIN detector. (South Dakota)
- L2SI
- LCLS II Strategic Initiative.
- L3
- Detector at LEP (CERN).
Send corrections to jmdeken@slac.stanford.edu
or propose new terms for SLACspeak.