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SLACspeak Terms

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B
The magnetic field of a Magnet. The physical symbol for magnetic field. The field in a magnet is sometimes referred to as the `B-Field.'
B
Bend magnet.
B Configuration
See BCON.
B Factory
One of two high-energy physics facilities currently in operation in the US (SLAC) and Japan (KEK). Both B Factories collide electrons with positrons to produce large numbers of B mesons (bound states of a bottom quark and an antidown quark) and anti-B mesons. By measuring the difference in decays of B and anti-B mesons, physicists hope to understand CP violation, thought to be the reason why matter dominates in the universe. At SLAC, the B Factory accelerates electrons at 9 GeV and positrons at 3.1 GeV; at KEK, the energies are 8 GeV and 3.5 GeV.
B Requested
See BREQ.
B&R
Budget and Reporting.
B-Desired
See BDES.
B-DOT
The rate of change of a B field over time ( dB / dt ).
B-Factory
See B Factory.
BA
Breathing Apparatus.
BA
Budget Authority.
BAAQMD
Bay Area Air Quality Management District.
BaBar
Official name for SLAC B Factory detector. Also known as B B-bar detector. (Named after the elephant in Laurent DeBrunhoff's children's books, with permission of DeBrunhoff's estate.)
BAC
Budget At Completion.
Back Phasing
To change the position of a bunch with respect to the RF. This fixes wakefield effects where the energy of the leading edge of the bunch is greater than that of the trailing edge.
Back Phasing
To adjust the RF phase to decrease the energy of a bunch.
Back Response
Response as measured in the thick layers of the Tracker.
  Glast Category: hardware
Backbone
The primary connectivity mechanism of a hierarchical distributed system. All systems which have connectivity to an intermediate system on the backbone are assured of connectivity to each other. This does not prevent systems from setting up private arrangements with each other to bypass the backbone for reasons of cost, performance, or security.
Background
Refers to background noise, or to the spurious radiation in a detector that tends to obscure the data.
Backleg
An extra winding on a magnet to add to, subtract from, or cancel a magnetic field. Sometimes called trim windings, backleg windings `fine tune' adjustments to the field.
Backplane
Signal data bus at the rear of a CAMAC crate or multibus crate.
Backsplash
Secondary particles and photons originating from very high- energy Gamma-ray showers in the calorimeter giving unwanted ACD signals.
  Glast Category: general
BACOP
Bay Area Construction Opportunity Program.
BACT
The actual field of a magnet at the last computer check in kilogauss/meter for a quadrupole, in kilogauss for a bend.
BACT
Best Available Control Technology. (from CAA)
BAD
BaBar Analysis Document.
BADC
Brilliant ADC (Analog-to-Digital Converter)
Baikal
an experiment in neutrino astronomy.
BAIS
BaBar Analysis Information System
Bakeout
The process of heating a vacuum pipe or chamber in order to drive out residual gas molecules which may have been trapped in or on the cavity walls.
BAKS
Baksan underground scintillation telescope.
Bandwidth
The capacity of the transmission medium stated in bits per second or as a frequency. The bandwidth of the optical fiber is in thee gigabit or billion bits per second range. Ethernet coaxial cable is in the megabit or million bits per second range.
Banking
A system for recording qualified air emission reductions for later use in bubble, offset, or netting transactions. See also Emissions Trading.
BAO
Baryon Acoustic Oscillations.
BAPVC
Bay Area PhotoValtaics Consortium.
Bar Screen
In wastewater treatment, a device used to remove large solids.
Barn
A unit of area equal to 10 to the minus 24 square centimeters, used to measure cross-sections in nuclear and particle physics. The cross-section of a uranium nucleus is approximately one barn.
BARRnet
Bay Area Regional Research Network. BARRnet was established in mid-1986 to serve the regional needs of Northern California and surroundings as a mid-level component of the NSFnet and has been operational since May 1987. The upper layer protocols in use are based on TCP/IP. SLAC connected to BARRnet through SUnet in the spring of 1988. See also NSFnet and SUnet.
BART
Best Available Retrofit Technology. (from CAA)
BAS
Beam Analyzing Station. BAS-1 AND BAS-10 are magnetic spectrometers used to check beam energy and spectrum (note that BAS-2 is no longer a spectrometer).
BAS
Beam Authorization Sheet. An official document kept in the control room which lists all of the radiation protection devices that must be locked in place to safely operate each beam line. Any changes to the BAS must be noted and signed for by the Operator in charge. Signing the BAS document certifies that the EOIC has read and understood all changes made to the current running conditions. Beams for each individual experiment are certified by radiation physics and ADSO, and for each beam the BAS lists those devices of the BCS that must be checked by the operator in charge before running that beam.
BAS
Business Application Services. (SLAC)
BAS-1
Beam Analyzing Station-1. Located immediately following the chicane in sector 1.
BAS-10
Beam Analyzing Station-10. BAS-10 is located at the beginning of sector 10 in the LINAC. BAS-10 is used for bunch length measurements: A dipole bends the beam to a screen and introduces dispersion. Bunch length is transformed to an energy spread, which can then be measured accurately.
BAS-2
Beam Analyzing Station-2. The sector 20 dump is used to run the beam in a `LINAC only mode,' also called BAS-2 MODE. Note that BAS-2 is no longer a Beam Analyzing Station. It is now a mode of operation that allows BSY entry while the front two- thirds of the LINAC is on.
BAS-2 Mode
BAS-2 was a beam analyzing station in sector 20 of the LINAC. BAS-2 mode is a LINAC mode of operation, in which the beam is dumped in sector 20 dump. Because BAS-2 mode is not interlocked with the FF or the arc MPS, operation may continue in BAS-2 mode whenever problems occur downstream of the BSY. The last two klystron sectors of the LINAC, sector 29 and sector 30, are then routinely shut down as a PPS protection for entry into the BSY if necessary.
base
A substance which forms a salt when reacted with an acid. Bases have a pH greater than 7.
Baseband
Characteristic of any network technology that uses a single carrier frequency and requires all stations attached to the network to participate in every transmission.
Basic User's Guide
See BUG.
BASS
Broadband Array Spectrograph System.
BAT
Best Available Technology. (from CWA)
Batch Job
A type of computer processing in which a batch of requests is stored and then executed all at one time. Batch job processing can take place without the user being present or online.
Batch Queue
A sequence of stored batch job requests that are awaiting execution.
BATS
Ballistic Aerial Target System.
BATSE
Burst and Transient Source Experiment
BATSE
Gamma-ray burst detector on the Compton Gamma-Ray Observatory.
  Glast Category: organization
  URL: http://heasarc.gsfc.nasa.gov/docs/cgro/cgro.html
Baud (rate)
A unit of computer data transmission speed named after Emile Jean Baudot who developed a transmission system in 1874. One Baud is equivalent to one BTS (BiT per Second).
BAW
Baseline Assessment Workshop. (ILC)
Bay Area Regional Research Network
See BARRnet.
BBA
Beam-Based Alignment
BBN
Big Bang Nucleosynthesis
BBR
Black Body Radiation
BBS
Bulletin Board System. An electronic message center serving a specific interest group.
BBS
Behavior Based Safety.
BBU
Beam BreakUp.
BC
Bubble chamber.
BC
Bunch Compressor. (LCLS)
BC
Bare Copper.
BCAL
Barrel CALorimeter
BCAT
A database primary.
BCCB
Baseline Change Control Board.
BCCP
Berkeley Center for Cosmological Physics.
BCD
Bottom Collider Detector (FermiLab)
BCD
Baseline Configuration Document (ILC).
BCIM
Beam Current Intensity Monitor.
BCM
Beam Containment Module.
BCON
B CONfiguration. The B Field of a magnet as specified in a saved configuration. BCON can only be changed by loading another configuration. Note that BDES changes to match BCON when a loaded configuration is activated.
BCP
Building Contact Person.
BCP
B physics and CP.
BCR
Baseline Change Request.
BCS
Beam Containment System. The beam containment system incorporates a variety of devices designed to prevent the beam from damaging the machine or escaping into areas where it would represent a hazard to machinery and/or personnel. The system uses comparators, average current monitors, SEM integrators, microswitches, flow switches, burn through monitors and ionization chambers to detect excessive power being applied to the various machine parts that are in need of protection, and to suppress the beam at its source (the injector) should this be necessary. Redundancy is liberally incorporated into the beam containment system.
BCSG
Big Collider Study Group
BCSOS
Body Centered Solid-On-Solid
BCT
Best Control Technology for conventional pollutants. (from CWA)
BCT
Brady-Cerighton-Thorne
BCW
Bare Copper Wire.
BCWP
Budgeted Cost for Work Performed.
BCWS
Budgeted Cost for Work Scheduled.
BD
Beam Driven.
BD-100
The Neutron Bubble Detector-100 at Chalk River Nuclear Laboratory.
BDAT
Best Demonstrated Available Technology. (from RCRA)
BDE
Beam Dump East. The dump or area at the end of the A Line.
BDES
B-DESired. The B field value of a magnet calculated from the model by the computer and saved into a configuration by the operator. It is retrieved whenever the saved configuration is recalled. A magnet will be set to BDES value only after the operator requests a trim action from the control system. BDES is usually calculated from the MODEL. BDES = Rigidity factor X KMOD.
BDIR
Beam Delivery and Interaction Region (ILC).
BDL
Beam Design Language. A stand-alone (non-SCP) program for setting TNOM for a given beam code.
BDMP
Beam dump.
BDMPSZ
Baier-Dokshitzer-Mueller-Peigne-Schiff-Zakharov
BDO
Beamline Duty Operator for SSRL.
BDS
Beam Delivery System.
BE
Bose-Einstein
Beam Analyzing Station
See BAS.
Beam Analyzing Station-1
See BAS-1.
Beam Analyzing Station-10
See BAS-10.
Beam Analyzing Station-2
See BAS-2.
Beam Authorization Sheet
See BAS.
Beam Code
A code of two bytes of timing information broadcasted from the MPG to all micros and crates. Each beam is operated under its own code which establishes its timing pattern. See PPYY and PP Beam #.
Beam Containment System
see BCS.
Beam Design Language
See BDL.
Beam Intensity Display
See BIDB.
Beam Intensity Display Unit
See BIDU.
Beam Position Monitor
see BPM.
Beam Position Monitor Processor
See BPMP.
Beam Position Monitor Stripline
See BPMS.
Beam Shut Off Ion Chamber
See BSOIC.
Beam Stay Clear
See BSC.
Beam Switchyard
See BSY.
Beam Test
Test conducted with high energy particle beams. (See Beam Test 2006.)
  Glast Category: general
  URL: https://confluence.slac.stanford.edu/display/BeamTest/Home
Beam Tree
Also sometimes called "current tree." A block of acrylic in which a defocussed low-energy beam has been stopped. The block is then struck with a sharp metal object, and the layer of additional charges is released as a cascade of current towards the point of impact. Permanent damage to the acrylic caused by the current flow appears as a tree-like structure. Also called a Lichtenberg tree. (For further information, see http://www.slac.stanford.edu/history/beamtree.sthml.)
Beamstrahlung
The synchrotron radiation emitted by each bunch of particles as it passes through the electromagnetic field of the opposing, or colliding bunch. Beamstrahlung signal is a function of the luminosity at the interaction point.
Beamstrahlung Monitor
See BSM.
Beamstrahlung Monitor Data
See BSMD.
BeamtestRelease
Version of the GlastRelease toolkit modified in support of the Beam Tests at the CERN and GSI accelerator facilities.
  Glast Category: software
Beamtree
See Beam Tree.
BEAP
Building Emergency Action Plan.
BEAST
Background Emission Anisotropy Scanning Telescope.
BEBC
Big European bubble chamber at CERN.
BEC
Bose-Einstein Condensate. A unique state of matter in which gas atoms, cooled to near-absolute-zero temperatures, overlap with each other and collapse into a common quantum state, where they behave essentially as a single "superparticle."
Becquerel
The International System (SI) unit for activity of radioactive material. One becquerel is that quantity of radioactive material in which one atom is transformed per second.
BELLE
KEKB detector (Japan)
BEMC
Backward ElectroMagnetic Calorimeter
Bend
A dipole magnet.
Bend String
Two or more bend magnets connected in series.
Bend Trim
See BTRM.
BENE
Beams for European Neutrino Experiments.
BENKEI
KEK - PS detector
BEPC
Beijing Electron Positron Collider
BEPC-II
Beijing Electron Positron Collider upgrade (2006).
BER
Biological and Environmental Research.
BES
BEijing Spectrometer.
BES
Basic Energy Sciences
BES-III
BEijing Spectrometer upgrade.
BESAC
Basic Energy Sciences Advisory Committee (DOE)
BESI
Beam Energy Spectrum Indicator.
BESM
Beam Energy Spread Monitor
BESS
Breaking Electroweak Symmetry Strongly
BESS
Baloon-borne Experiment with Superconducting Spectrometer (US- Japan)
BESSY
Berliner Elektronenspeicherring-gesellschaft für Synchrotron Strahlung.
Beta
See Betatron Oscillation.
Beta Function
See Betatron Oscillation. There is both a horizontal and a vertical beta function.
Beta Star
The value of the beta function at the IP. There is a horizontal and a vertical beta star.
Betatron Oscillation
The wavelength of the transverse oscillation of a beam, measured in meters. The restoring force for the Betatron oscillations is provided by the quadrupole magnets which focus separately, in the vertical and horizontal planes. Therefore, there are both horizontal and vertical betatron oscillations. Beta is a Twiss parameter.
BeV
Billion (Giga) electron Volt. This term was used in early writing about linear accelerators, but GeV is now preferred. (See GeV)
Bezoic
see BSOIC.
BF
Batalin-Fradkin
BFAC
B-FACtory.
BFACF
Berg-Foerster-Aragao de Carvalho-Caracciolo-Frohlich
BFEM
Balloon Flight Engineering Model.
BFFT
Batalin-Fradkin-Fradkina-Tyutin
BFKL
Balitskii-Fadin-Kuraev-Lipatov
BFMail
An electronic mail system that allows PEP-II and Detector collaborators to send e-mail using the PEP-II Database from any computer platform. See also PEP-II Database.
BFT
Batalin-Fradkin-Tyutin
BFV
Batalin-Fradkin-Vilkovisky
BFW
Beam Finder Wire.
BFYM
Balatin-Fradkin-Yang-Mills
BGO
Bismuth Germanate. (SLAC E-146 used a BGO spectrometer)
BGRP
Beam Group.
BH
Black Hole
BH
Beam Hardener.
Bhabha
An elastic electron-positron collision.
BHF
Brueckner-Hartree-Fock
BHFP
Black Hole Finder Probe.
BIA
Business Impact Assessment.
BIC
Bunch Intensity Control.
Bicep, Bicep2
Background Imaging of Cosmic Extragalactic Polarisation.
BICSI
Building Industry Consulting Service International.
BIDB
Beam Intensity Display. A database primary.
BIDU
Beam Intensity Display Unit. A database primary.
Big Science
Science projects which have large budgets, many collaborators, and, more recently, are multi-national.
Big Sky
A laser spot monitor for the SLC Laser gun. This is the name of a commercially available software and hardware package.
Big-endian
A format for storage or transmission of binary data in which the most significant bit or byte comes first. The reverse convention is called little-endian.
BigBOSS
Big Baryon Oscillation Spectroscopic Survey instrument.
Bill Of Lading
A receipt listing goods shipped, issued by a common carrier.
Binder Service
See Broker Service.
Binding
Logically associating a name with a socket. When a handle for an ONC RPC is created, it is bound to a network socket address.
Bino
In models of supersymmetry, the lightest new particle and partner of the photon.
BINP
Budker Institute for Nuclear Physics (Novosibirsk).
BIO
Building Inspection Office (ES&H).
Bioaccumulation
See Bioconcentration.
Bioconcentration
A biological process whereby chemicals are accumulated in tissues at concentrations above those in the immediate environment. This process is also knows as bioaccumulation.
Biodegradation
The process of breaking down a chemical substance or mixture through biological mechanisms.
Biological Monitoring
Use of biological organisms and their products to monitor toxicity levels.
Biological Treatment
Treatment process utilizing living microorganisms to decompose organic wastes into less complex organic or inorganic substances. Techniques include activated sludge, aerated lagoons, trickling filters, waste stabilization ponds, and anaerobic digestion.
BIR
Beam Interupt Relay.
BIS
Business Information Systems (SLAC).
BIS2
BIS-2 spectrometer at Serpukhov.
BITNET
Because It's Time NETwork. A U.S. academic-based network that relies on the Internet network to transfer messages and files. BITNET originally was a separate international network that supported international communication via cooperating networks on most continents and gateways to unrelated networks.
Bits per Second
See BTS.
BITT
Business Improvement and Transition Team.
Bjorken scaling
A method of predicting the behavior of inelastic electron scattering cross sections developed by James D. Bjorken.
BKDE
Brookhaven Kaon Decay Experiment.
BKT
Berezinskii-Kosterlitz-Thouless
BL
Beam Line.
BL LACs
BL LACertaes. A type of active galactic nuclei.
BLA
Beam Line Authorization.
BlackHat
Computer program that automates computation of QCD amplitudes.
Blazar
Classified as a type of AGN, blazars are thought to be supermassive black holes with relativistic jets emanating in opposite directions. We observe them by peering 'down' the jet which is pointing towards the earth. Thi s off-axis viewing angle would account for their rapid variability and compact features.
  Glast Category: astronomy
BLDG
Building.
BLE
Beam Line Electronics. (SSRL)
BLEVE
Boiling-Liquid-Expanding-Vapor Explosion. The possible result of a complex sequence of events involving the impingement of flame on the exterior of a container of liquefied gas.
BLH
Beam Line, Hard. LCLS Hard X-Ray beamline.
BLM
Bureau of Land Management.
BLM
Brodsky-Lepage-MacKenzie
Blow Torch Quads
A concentration of quadrupole magnets in the front end of the LINAC just after the positron injection point. The quads transport the large emittance positron beam through Sector 1.
BLR
B-Layer Replacement. (ATLAS)
BLS
Beam Line Systems. (SSRL)
BLT
Batalin-Lavrov-Tyutin
BLT
Back-Lit Thyratron.
Blue Book
The popular name for the `The Stanford Two Mile Accelerator' by Richard B. Neal (N.Y., Benjamin, 1968), SLAC Library call number QCD191.N41. Refers, too, to the 'SLC Design Handbook,' which also has a blue cover. (Note that the paperback edition of 'The Stanford Two Mile Accelerator' is not blue.)
BM
Building Manager. (SLAC)
BMAX
The maximum allowable magnetic strength in kilogauss.
BMBF
BundesMinisterium für Bildung und Forschung. (The Federal Ministry of EDucation and Research)
BMF
Business Managers' Forum.(SLAC)
BMN
Berenstein-Maldacena-Nastase
BMP
Best Management Practices. (from CWA)
BMP
Building Manager Program.
BMPF
Best Management Practice Finding.
BMS
Bondi-Metzner-Sachs.
BMSC
Building Managers Steering Committee.
BMT
Bargmann-Michel-Telegdi
BNCT
Boron Neutron Capture Therapy
BNDS
BeND String.
BNHBC
British National Hydrogen Bubble Chamber.
BNL
Brookhaven National Laboratory, NY.
BNL ION
Brookhaven heavy ion accelerator.
BNL Proposals
Experimental proposals put out by the Brookhaven Laboratory.
BNS Damping
Balakin, Novakhatsky, and Smirnov are the names of the three Russian physicists who developed the technique called BNS Damping. It is a technique which spreads the oscillation frequencies of the particles in a beam (in order to avoid resonance) by introducing a longitudinal energy spread along the bunch. This is done by backphasing early klystrons (creating an energy spread) and forward phasing later klystrons. Sometimes inaccurately referred to as Landau Damping. See SLAC-PUB-3944.
BOA
Basic Ordering Agreement.
BOD
Biochemical Oxygen Demand.
BOD
Bottom Of Duct.
BOD
Beam Overlap Diagnostic. A device used to locate the positions and orientation of the electron and x-ray beams after they exit the m agnetic chicane and grating monochromator. A subsystem of the Soft X-ray Self Seeding (SXRSS) project.
Boiling Point
See BP.
Boiling-Liquid-Expanding-Vapor Explosion
See BLEVE.
BONA
Bonanza nonmagnetic detector at DORIS.
Bone Yard
A storage area north of Sectors 12 and 13 of the linac, where concrete blocks and metal scrap used in radiation shielding applications are stored.
BOO
Board Of Overseers. (Stanford)
bookmark
(verb) To mark an electronic document or a specific place in an electronic document for later retrieval. (noun) The hard-drive file that contains a URL and the text identifying the URL. Nearly all Web browsers support a bookmarking feature that lets you save the address (URL) of a Web page so that you can easily re-visit the page at a later time.
BOOMERanG
Balloon Observations Of Millimetric Extragalactic Radiation ANd Geophysics.
Booster to SPEAR
See BTS.
BOOTP
Bootstrap Protocol. An Internet protocol that enables a diskless workstation to discover its own IP address, the IP address of a BOOTP server on the network, and a file to be loaded into memory to boot the machine. This enables the workstation to boot without requiring a hard or floppy disk drive.
BOREXINO
a solar neutrino experiment at the Laboratori Nazionali del Gran Sasso in Italy.
BOSS
Baryon Oscillation Spectroscopic Survey. (Third Sloan Digital Sky Survey)
Bottomonium
General name for the set of particles that contain both a bottom q uark and and anti-bottom quark, but are bound together with differ ent energies.
Bounce
The return of a piece of electronic mail because of an error in its delivery.
BP
Boiling Point. The temperature at which a continuous flow of vapor bubbles occurs in a liquid being heated in an open container.
BP
Beam Physics.
BPE
Borated PolyEster. Common term for specifically formulated polyest er material used to shield gamma and fast neutron radiation. Avail able in sheets, bricks, cylinders, blocks and in certain formulati ons, pellets.
BPFTW
Braaten-Pisarski-Frenkel-Taylor-Wong
BPHZ
Bogolyubov-Parasiuk-Hepp-Zimmerman
BPM
Beam Position Monitor. A device including four electrodes located inside the beam pipe, and the associated electronics necessary to locate the position of the centroid of the beam. The electrodes are usually located about 90 degrees apart inside the vacuum chamber, far enough away from the beam's path not to interfere with it, but close enough to feel the electric charge of the beam's passing.
BPM Strip
One of four electrodes inserted in the beam line to measure the position of a beam. Also known as a Button.
BPMO
See Beam Position Monitor.
BPMP
Beam Position Monitor Processor. A CAMAC module that is used to process and digitize the four signals from BPMS.
BPMS
Beam Position Monitor Stripline. Also used for BPM reading.
BPP
Bose-Parker-Peleg
BPS
Bits Per Second. The number of bits of data transferred by a terminal, modem, or computer in one second. See also Baud.
BPS
Bogomolny-Prasad-Sommerfield
BPS
Beijing Proton-Synchrotron.
BPT
Best Practicable Technology. (from CWA)
BPWA
Barrelet-zero Partial-Wave Analysis.
BPX
Burning Plasma eXperiment.
BRAHMS
Broad Range Hadron Magnetic Spectrometer, one of RHIC's detectors.
BRC
Below Regulatory Concern.
Breakthrough Time
See BTT.
Bremsstrahlung
(German: braking radiation) The X rays emitted when a charged particle is decelerated by passing through matter.
BREQ
B REQuested. The B field of a magnet asked for by a feedback process. BREQ is a magnet database secondary.
Broadband
Characteristic of any network that multiplexes multiple, independent network carriers onto a single cable. This is usually done using frquency division multiplexing. Broadband technology allows several networks to coexist on one single cable; traffic from one network does not interfere with traffic from another since the "conversations" happen on different frequencies in the "ether," rather like the commercial radio system.
Broker Service
Synonymous with a binder service. It maintains binding information for network services.
Brown Out
A reduced main line electric power condition caused by excessive draw on the power grid, usually due to a combination of factors. These factors include irrigation pumps running in the San Joaquin Valley, air conditioners, wind tunnel operation at NASA Ames Research Center, etc. When the brown out is imminent, SLAC usually gets enough notice to shut down its major power- consuming devices to avoid excessively loading down the grid. We frequently get several hours notice before a brown out, and can plan to run some of the lower power experiments on the site, depending on the maximum power we are allowed to consume.
BRS
Becchi-Rouet-Stora
BRST
Becchi-Rouet-Stora Transformation. A quantization method of gauge and string theories.
BRZMNT
BRaZeMeNT.
BS
Bethe-Salpeter
BS
Beam Stopper.
BSC
Beam Stay Clear. The maximum cross section a beam may have before particles get lost in the physical or dynamic aperture, whichever is smaller.
BSD
Business Services Division.
BSD
Berkeley Software Distribution. Term used when describing different versions of the Berkeley UNIX software, as in "4.3BSD UNIX.'
BSE
Bethe-Salpeter equations
BSFT
Boundary String Field Theory.
BSI
Broken Scale Invariant
BSIT
Business Services and Information Technology. (SLAC)
BSLS
Business Systems and Lab Support (BSD-SLAC)
BSM
BeamStrahlung Monitor. A device for detecting beamstrahlung radiation in the SLC final focus. See also Beamstrahlung.
BSMD
BeamStrahlung Monitor Data. A database primary.
BSO
Berkeley Site Office (DOE)
BSOIC
Beam Shut Off Ion Chamber. One of a number of PPS radiation- monitoring devices situated at strategic points throughout the machine, usually close to, but on the outside of, the beam housing shielding. Ionization of the gas-filled chamber by radiation will cause the BSOIC to trip off the beam if the level of radiation is above the trip point of the chamber. At SLAC the BSOIC trip points are set at 100 mr/hour. The BSOICs are monitored both by MCC and OHP. They are fail-safe devices, and will trip the beam off if unplugged. (Sometimes seen as BeSOIC or Bezoic).
BSRF
Beijing Synchrotron Raidation Facility (China).
BSY
Beam SwitchYard. The end of the LINAC where beams are switched to the SLC arcs, the PEP ring or end station areas.
BTCF
Beijing Tau-Charm Factory (proposed)
BTEM
Beam TEst tracker Module (GLAST).
BTEM
Beam Test Engineering Model.
BTH
Beam Transport Hall. (LCLS)
BTM
Burn-Through Monitor.
BTP
Batch Treatment Plant.
BTP
Biomedical Technology Program. (NIH)
BTR
Beam Target Room.
BTRM
Bend TRiM. An extra winding of wire around the iron of a bend magnet designed for lower current, and with its own power supply for independent control, used to fine adjust the field strength of the magnet. See Backleg.
BTS
Booster To SPEAR. The beam transport line between the SSRL booster ring and the SPEAR storage ring incorporating a section of the old 17 line.
BTS
Base Transceiver Station (part of a cell phone tower).
BTT
BreakThrough Time. The period of time that elapses between initial contact of one side of a protective barrier (e.g. gloves, suits, etc.) and the time that the material is able to be be detected on the other side of the barrier.
BTU
British Thermal Unit.
BTUH
British Thermal Units-Hours.
BTX
Benzene-Toluene-Xylene.
BTZ
Banados-Teitelboim-Zanelli
BU
BUdget Office.
BU
Bargaining Unit.
BU
BackUp.
Bucket
One of the possible positions to store a bunch in a storage ring. The number of buckets can be calculated by dividing the circulation frequency into the RF accelerating frequency. For example, if the RF oscillates 100 times every time the bunch circulates once around the ring, then there are 100 buckets, or possible places for the bunch to exist in that particular ring. In SPEAR, there are 280 possible buckets, and the users would like to be able to fill all of them in order to maximize the stored current and the resultant synchrotron light.
Bucking Coil
A solenoid used to cancel a detector field outside of the detection area (usually also a solenoid). Solenoid coils are used to cancel stray solenoid fields at the SLC or NPI guns, so that the beam is not adversely affected by the stray fields.
Buffer
A temporary storage facility, used to accumulate data into blocks of sufficient size to be handled efficiently by a processor or terminal.
Buffer Zone
An area of land which surrounds a hazardous waste facility and on which certain land uses and activities are restricted to protect the public health and safety and the environment from existing or potential hazards caused by the migration of hazardous waste. (CH&SE Sec. 251 10.3)
BUG
Basic User's Guide. An SLC Control system document.
Bugger
To jump or otherwise circumvent the interlocks in an operating system.
Bugger List
The list of bypassed MPS devices such as ionization chambers, slits, or water temperature interlocks. The list is in a blue binder on the console desk.
Bulk Supplies
A power supply that feeds more than one magnet, usually by feeding unregulated DC power to more than one regulator. In this manner, one large transformer and rectifier-filter system can feed several regulators, which is usually cheaper than each magnet having its own complete power supply system.
Bunch
A compressed packet of particles. SLC bunches are two to three mm long in the arcs. A repeating train of such bunches is usually referred to as a beam.
Bunch Muncher
A trigger driven device that momentarily shuts off the RF in the damping rings. In the past this has been used to compress the bunch or to dump unwanted beams.
Buncher
An accelerator section used to compress a cloud of electrons into a bunch. The SLC uses two subharmonic bunchers and an S-BAND buncher in CID.
Burn Through Monitor
A beam containment device used to detect the destruction of a primary beam stopping device. These units are usually canisters under pressure positioned near beam dumps or collimators. When the beam hits a burn through monitor, the can develops a leak and the pressure drops. This pressure drop triggers a switch which shuts off the accelerator. Formerly called Disaster Monitors or DM's.
Bus
A collection of wires through which data is transmitted from one part of a computer to another.
Button
See BPM Strip.
BUU
Boltzmann-Uhling-Uhlenbeck
BV
Balatin-Vilkovisky
BW
Birman-Wenzl
BW
BackWard.
BWM
Birman-Wenzl-Murakami
BWR
Boiling Water Reactor.
B3
A bend magnet.
B845
BNL experiment 845 detector.

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

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