- The magnetic field of a Magnet. The physical symbol for
magnetic field. The field in a magnet is sometimes referred to as
- 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.
- Budget and Reporting. (sometimes listed as BNR)
- See BDES.
- The rate of change of a B field over time ( dB / dt ).
- See B Factory.
- Breathing Apparatus.
- Budget Authority.
- Bay Area Air Quality Management District.
- 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.)
- 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
- 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.
- Refers to background noise, or to the spurious radiation in
a detector that tends to obscure the data.
- 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.
- Signal data bus at the rear of a CAMAC crate or multibus
- Secondary particles and photons originating from very high-
energy Gamma-ray showers in the calorimeter giving unwanted ACD
Glast Category: general
- Bay Area Construction Opportunity Program.
- The actual field of a magnet at the last computer check in
kilogauss/meter for a quadrupole, in kilogauss for a bend.
- Best Available Control Technology. (from CAA)
- BaBar Analysis Document.
- Brilliant ADC (Analog-to-Digital Converter)
- an experiment in neutrino astronomy.
- BaBar Analysis Information System
- 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.
- Baksan underground scintillation telescope.
- 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.
- A system for recording qualified air emission reductions for
later use in bubble, offset, or netting transactions. See also
- Baryon Acoustic Oscillations.
- Bay Area PhotoValtaics Consortium.
- Bar Screen
- In wastewater treatment, a device used to remove large
- 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.
- 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.
- Best Available Retrofit Technology. (from CAA)
- 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).
- 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.
- Business Application Services. (SLAC)
- Beam Analyzing Station-1. Located immediately following the
chicane in sector 1.
- 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.
- 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.
- A substance which forms a salt when reacted with an acid.
Bases have a pH greater than 7.
- 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.
- Broadband Array Spectrograph System.
- 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
- Ballistic Aerial Target System.
- Burst and Transient Source Experiment
- Gamma-ray burst detector on the Compton Gamma-Ray
Glast Category: organization
- 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).
- Baseline Assessment Workshop. (ILC)
- Bay Area Regional Research Network
- See BARRnet.
- Beam-Based Alignment
- Big Bang Nucleosynthesis
- Black Body Radiation
- Bulletin Board System. An electronic message center serving
a specific interest group.
- Behavior Based Safety.
- Beam BreakUp.
- Bubble chamber.
- Bunch Compressor. (LCLS)
- Bare Copper.
- Barrel CALorimeter
- A database primary.
- Baseline Change Control Board.
- Berkeley Center for Cosmological Physics.
- Bottom Collider Detector (FermiLab)
- Baseline Configuration Document (ILC).
- Beam Current Intensity Monitor.
- Beam Containment Module.
- 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.
- Building Contact Person.
- B physics and CP.
- Baseline Change Request.
- 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
- Big Collider Study Group
- Body Centered Solid-On-Solid
- Best Control Technology for conventional pollutants. (from
- Bare Copper Wire.
- Budgeted Cost for Work Performed.
- Budgeted Cost for Work Scheduled.
- Beam Driven.
- The Neutron Bubble Detector-100 at Chalk River Nuclear
- Best Demonstrated Available Technology. (from RCRA)
- Beam Dump East. The dump or area at the end of the A Line.
- 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.
- Beam Delivery and Interaction Region (ILC).
- Beam Design Language. A stand-alone (non-SCP) program for
setting TNOM for a given beam code.
- Beam dump.
- Beamline Duty Operator for SSRL.
- Beam Delivery System.
- 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 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
Glast Category: general
- 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
- 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.
- Version of the GlastRelease toolkit modified in support of
the Beam Tests at the CERN and GSI accelerator facilities.
Glast Category: software
- See Beam Tree.
- Building Emergency Action Plan.
- Background Emission Anisotropy Scanning Telescope.
- Big European bubble chamber at CERN.
- 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."
- 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.
- KEKB detector (Japan)
- Backward ElectroMagnetic Calorimeter
- A dipole magnet.
- Bend String
- Two or more bend magnets connected in series.
- Bend Trim
- See BTRM.
- Beams for European Neutrino Experiments.
- KEK - PS detector
- Beijing Electron Positron Collider
- Beijing Electron Positron Collider upgrade (2006).
- Biological and Environmental Research.
- BEijing Spectrometer.
- Basic Energy Sciences
- BEijing Spectrometer upgrade.
- Basic Energy Sciences Advisory Committee (DOE)
- Beam Energy Spectrum Indicator.
- Beam Energy Spread Monitor
- Breaking Electroweak Symmetry Strongly
- Baloon-borne Experiment with Superconducting Spectrometer
- Berliner Elektronenspeicherring-gesellschaft für
- 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.
- Billion (Giga) electron Volt. This term was used in early
writing about linear accelerators, but GeV is now preferred. (See
- see BSOIC.
- Berg-Foerster-Aragao de Carvalho-Caracciolo-Frohlich
- Balloon Flight Engineering Model.
- Beryllium Focusing Lens.
- 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.
- Beam Finder Wire.
- Bismuth Germanate. (SLAC E-146 used a BGO spectrometer)
- Beam Group.
- Black Hole
- Beam Hardener.
- An elastic electron-positron collision.
- Black Hole Finder Probe.
- Business Impact Assessment.
- Bunch Intensity Control.
- Bicep, Bicep2
- Background Imaging of Cosmic Extragalactic Polarisation.
- Building Industry Consulting Service International.
- Beam Intensity Display. A database primary.
- 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.
- 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.
- Big Baryon Oscillation Spectroscopic Survey instrument.
- Bill Of Lading
- A receipt listing goods shipped, issued by a common carrier.
- Binder Service
- See Broker Service.
- Logically associating a name with a socket. When a handle
for an ONC RPC is created, it is bound to a network socket
- In models of supersymmetry, the lightest new particle and
partner of the photon.
- Budker Institute for Nuclear Physics (Novosibirsk).
- Building Inspection Office (ES&H).
- See 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.
- The process of breaking down a chemical substance or mixture
through biological mechanisms.
- Biological Monitoring
- Use of biological organisms and their products to monitor
- 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
- Beam Interupt Relay.
- Business Information Systems (SLAC).
- BIS-2 spectrometer at Serpukhov.
- 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.
- Business Improvement and Transition Team.
- Bjorken scaling
- A method of predicting the behavior of inelastic electron
scattering cross sections developed by James D. Bjorken.
- Brookhaven Kaon Decay Experiment.
- Beam Line.
- BL LACs
- BL LACertaes. A type of active galactic nuclei.
- Beam Line Authorization.
- Computer program that automates computation of QCD
- 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
- Beam Line Electronics. (SSRL)
- 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.
- Beam Line, Hard. LCLS Hard X-Ray beamline.
- Bureau of Land Management.
- 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.
- B-Layer Replacement. (ATLAS)
- Beam Line Systems. (SSRL)
- 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.)
- Building Manager. (SLAC)
- The maximum allowable magnetic strength in kilogauss.
- BundesMinisterium für Bildung und Forschung. (The
Federal Ministry of EDucation and Research)
- Business Managers' Forum.(SLAC)
- Best Management Practices. (from CWA)
- Building Manager Program.
- Best Management Practice Finding.
- Building Managers Steering Committee.
- Boron Neutron Capture Therapy
- BeND String.
- British National Hydrogen Bubble Chamber.
- 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.
- Basic Ordering Agreement.
- Biochemical Oxygen Demand.
- Bottom Of Duct.
- 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.
- 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.
- Board Of Overseers. (Stanford)
- (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.
- Balloon Observations Of Millimetric Extragalactic Radiation
- Booster to SPEAR
- See BTS.
- 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.
- a solar neutrino experiment at the Laboratori Nazionali del
Gran Sasso in Italy.
- Baryon Oscillation Spectroscopic Survey. (Third Sloan
Digital Sky Survey)
- 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.
- The return of a piece of electronic mail because of an error
in its delivery.
- Boiling Point. The temperature at which a continuous flow of
vapor bubbles occurs in a liquid being heated in an open
- Beam Physics.
- 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.
- 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.
- See Beam Position Monitor.
- Beam Position Monitor Processor. A CAMAC module that is used
to process and digitize the four signals from BPMS.
- Beam Position Monitor Stripline. Also used for BPM reading.
- Bits Per Second. The number of bits of data transferred by a
terminal, modem, or computer in one second. See also Baud.
- Beijing Proton-Synchrotron.
- Best Practicable Technology. (from CWA)
- Barrelet-zero Partial-Wave Analysis.
- Burning Plasma eXperiment.
- Broad Range Hadron Magnetic Spectrometer, one of RHIC's
- Below Regulatory Concern.
- Breakthrough Time
- See BTT.
- (German: braking radiation) The X rays emitted when a
charged particle is decelerated by passing through matter.
- B REQuested. The B field of a magnet asked for by a feedback
process. BREQ is a magnet database secondary.
- Bridging Research Interactions through collaborative
Development G rants in Energy. (DOE)
- 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.
- Becchi-Rouet-Stora Transformation. A quantization method of
gauge and string theories.
- Beam Stopper.
- Beam Stay Clear. The maximum cross section a beam may have
before particles get lost in the physical or dynamic aperture,
whichever is smaller.
- Business Services Division.
- Berkeley Software Distribution. Term used when describing
different versions of the Berkeley UNIX software, as in "4.3BSD
- Bethe-Salpeter equations
- Boundary String Field Theory.
- Broken Scale Invariant
- Business Services and Information Technology. (SLAC)
- Business Systems and Lab Support (BSD-SLAC)
- BeamStrahlung Monitor. A device for detecting beamstrahlung
radiation in the SLC final focus. See also Beamstrahlung.
- BeamStrahlung Monitor Data. A database primary.
- Berkeley Site Office (DOE)
- 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
- Beijing Synchrotron Raidation Facility (China).
- Beam SwitchYard. The end of the LINAC where beams are
switched to the SLC arcs, the PEP ring or end station areas.
- Beijing Tau-Charm Factory (proposed)
- Beam TEst tracker Module (GLAST).
- Beam Test Engineering Model.
- Beam Transport Hall. (LCLS)
- Burn-Through Monitor.
- Batch Treatment Plant.
- Biomedical Technology Program. (NIH)
- Beam Target Room.
- 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.
- 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.
- Base Transceiver Station (part of a cell phone tower).
- 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.
- British Thermal Unit.
- British Thermal Units-Hours.
- BUdget Office.
- Bargaining Unit.
- 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.
- 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)
- Basic User's Guide. An SLC Control system document.
- To jump or otherwise circumvent the interlocks in an
- 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.
- 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.
- 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
- A collection of wires through which data is transmitted from
one part of a computer to another.
- See BPM Strip.
- Boiling Water Reactor.
- A bend magnet.
- BNL experiment 845 detector.
Send corrections to email@example.com
or propose new terms for SLACspeak.