Because of the increase in beam energy and intensity at the Superconducting Super Collider Laboratory (SSCL) accelerator, the biological shielding necessary for the experimental halls will require a much more critical view than that carried out for previo...
National Technical Information Service (NTIS)
Early operation of the 50 MeV high brightness electron linac of the Accelerator Test Facility is described along with experimental data. This facility is designed to study new linear acceleration techniques and new radiation sources based on linacs in combination with free electron lasers. The accelerator utilizes a photo-excited, ...
Energy Citations Database
Because of the increase in beam energy and intensity at the Superconducting Super Collider Laboratory (SSCL) accelerator, the biological shielding necessary for the experimental halls as well as the shielding for various detector components will require a much more critical review than that carried out for previous high energy physics ...
DOE Information Bridge
... of Congressional Budget reports are available shortly after postings on Thomas (Library of Congress ... Title : Accelerators with a Closed Hall Current. ...
DTIC Science & Technology
In this paper, we describe the results of a study of laser induced fluorescence velocimetry of ionic xenon in the plume and interior acceleration channel of a laboratory Hall type thruster operating at powers ranging from 250 to 725 W. Optical access to t...
The CEBAF accelerator at Jefferson laboratory can deliver CW electron beams to three experimental halls simultaneously. A large fraction of the approved scientific program at the lab requires polarized electron beams. Many of these experiments, both polarized and unpolarized, require high average beam current as well. Since all ...
An analysis was made of loss mechanisms of a lowtemperature plasma accelerator. The principle loss mechanisms in these accelerators are those due to the electrode boundary layer and to Hall current effects. An experimental and theoretical investigation was carried out, using argon "seeded" with potassium, operating at a free ...
This thesis describes the magnetic measurements that have been performed on the superconducting quadrupoles of the High Resolution Spectrometers of TJNAF, Hall A (USA), which are designed to measure particle momentum up to 4 GeV.c(sup -1) with a (sigma)p/...
There is an active program of few-body form factor measurements in Hall A of Thomas Jefferson National Accelerator Facility (Jefferson Laboratory). Recent measurements of the deuteron elastic electric, A(Q2), and magnetic, B(Q2), structure functions will be presented. Planned measurements of the form factors of 3He and 4He will also be ...
Thomas Jefferson National Accelerator Facility (Jefferson Lab; formerly known as CEBAF), operates a 4 GeV, 200 {micro}A continuous wave (CW) electron accelerator that re-circulates the beam five times through two superconducting 400 MeV linacs. Electrons can be extracted from any of the five recirculation passes and beam can be simultaneously delivered to ...
Aug 23, 2005 ... The test involved a Hall thruster built under the High Voltage Hall Accelerator ... The HiVHAC was tested in a vacuum chamber at Glenn that ...
NASA Website
Laboratory . . . . . . . . . . . . . . . . . . . . . . . . . . . .C4 8800 IGPP Munk Laboratory Hall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C4 8865 Isaacs Hall Trailer #1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C4 8867 Isaacs Hall Trailer #2
E-print Network
Future development of the FLNR accelerator complex (project DRIBs-III) includes modernization of existing cyclotrons, construction of a new experimental hall, creation of a new high current cyclotron and of next generation experimental set-ups. Realization of the project is planned for 2010-2016.
NASA Astrophysics Data System (ADS)
Magnetic field topology has been found to be a central design concern for high-efficiency Hall thrusters. For future improvements in Hall thruster design, it is necessary to better understand the effects that magnetic field topology has on the internal plasma structure. The Plasmadynamics and Electric Propulsion Laboratory's ...
The mission of the Jefferson Lab Operations Group is to provide safe and efficient delivery of high quality electron beam for Jefferson Laboratory's nuclear and accelerator physics programs. The Operations staff must be able to setup, transport, maintain, and troubleshoot beam to all three experimental halls in a safe, ...
We describe the design and commissioning of the photon tagging beamline installed in experimental Hall B at the Thomas Jefferson National Accelerator Facility. This system can tag photon energies over a range from 20% to 95% of the incident electron energy, and is capable of operation with beam energies up to 6.1 GeV. A single dipole magnet is combined ...
... EQUILIBRIUM IONIZATION AT ELEVATED ELECTRON TEMPERATURES. PART I. THEORY and governing equations,. ...
In February 2006, Jefferson Laboratory in Newport News, VA, received � Critical Decision 1� (CD-1) approval to proceed with the engineering and design of the long anticipated upgrade to increase the beam energy of CEBAF, the Continuous Electron Beam Accelerator Facility, from 6 GeV to 12 GeV. This will require the installation of 10 new cryomodules, ...
In February 2006, Jefferson Laboratory in Newport News, VA, received ``Critical Decision 1'' (CD-1) approval to proceed with the engineering and design of the long anticipated upgrade to increase the beam energy of CEBAF, the Continuous Electron Beam Accelerator Facility, from 6 GeV to 12 GeV. This will require the installation of 10 new cryomodules, and ...
... Ion Velocity Measurements within the Acceleration Channel of a Low Power Hall Thruster ... Considerable external acceleration 16km/s 14 12 10 8 6 ...
The LCLS at the SLAC National Accelerator Laboratory will be the world's first source of an intense hard x-ray laser beam, generating x-rays with wavelengths of 1nm and pulse durations less than 100fs. The ultrafast x-ray pulses will be used in pump-probe...
Action Tracking System LHS Lawrence Hall of Science LLNL Lawrence Livermore National Laboratory L/M Line County Fire Department AHD Activity Hazard Documentation ALARA as low as reasonably achievable ALCO Alameda County (Fire Department) ALS Advanced Light Sources ASD Administrative Services Department ASPCP
Time-dependent magnetic fields are applied to a large laboratory plasma operating in the regime of electron magnetohydrodynamics (EMHD; magnetized electrons, unmagnetized but mobile ions). The fields are produced by pulsing currents through insulated magnetic loop antennas whose dipole axis is parallel or antiparallel to the uniform dc magnetic field. The magnetic J xB force ...
... NOSEMATOSIS IN LABORATORY ANIMALS WilliamC. Hal .. WilliamC. Hal ... NOSEMATOSIS IN LABORATORY ANIMALS William C. Hall ...
The Thomas Jefferson National Accelerator Facility (Jefferson Lab) comprises a 5 GeV continuous electron beam accelerator (CEBAF) delivering beam to three experimental halls, and a kilowatt range tunable free electron laser (FEL), currently being upgraded to a 10 kW machine. The progression into steady state experimental runs at the ...
... NB, Hargus WA, Jr., and Cappelli MA, �A Low-Power, Linear-Geometry Hall Plasma Source with an Open Electron-Drift,� Plasma Sources Science ...
... System Developed for Wilford Hall USAF Medical Center, 1972,. ... defined within the Operational System section (Chemistry Laboratory), which deals ...
The Jefferson Laboratory's superconducting radiofrequency (srf) Continuous Electron Beam Accelerator Facility (CEBAF) provides multi-GeV continuous-wave (cw) beams for experiments at the nuclear and particle physics interface. CEBAF comprises two antiparallel linacs linked by nine recirculation beam lines for up to five passes. By the early 1990s, ...
According to the work program and schedule there was developed the methodology of experiments on the discharge chamber material influence on the Hall thruster characteristics there was prepared Hall thruster model of the SPT- 100 type for these experiment...
The acceleration of the plasma in the Hall thruster to supersonic velocities is examined by the use of a steady state model. Flows that are smooth across the sonic transition plane are found. The possibility of generating flows in which the acceleration across the sonic plane is abrupt, is also studied.
The requirements of spacecraft propulsion systems for new mission profiles have increased beyond the
NASA Technical Reports Server (NTRS)
Language: English ...
NBII National Biological Information Infrastructure
The Hall-effect thruster (HET) is an advanced spacecraft propulsion system that uses electrical power provided by the spacecraft to generate thrust by ionizing and accelerating propellant to high velocities. HETs are now used in earth orbit for satellite propulsion and are being considered for a variety of missions in deep space. While HETs have been ...
Tests SLAC National Accelerator Laboratory About FACET Home What Is FACET? Research Plasma Wakefield Acceleration THz Radiation Plasma Focusing Dielectric Wakefield Acceleration...
Science.gov Websites
The Advanced Photon Source Project has passed the mid-point in its construction. The linac and synchrotron booster enclosures are complete. A portion of the experiment hall has been completed and put into use to support accelerator component assembly, test, and installation. Plans for the user lab/office modules and the central ...
... reduce or eliminate the influence of the walls on the ... in this way, the selection of wall material and ... can be made independently of its effect that the ...
A collection of Web-based games and activities to develop an understanding of the operations and experiments that take place in the Fermilab accelerator and detector halls and the...
Effect of mass entrainment from vacuum tank and electrode erosion on plasma velocity determined from
Results are presented of experimental investigations of the volt--ampere charactaeristics of a discharge between the electrodes of an MHD accelerator, of the longitudinal boundary effect, the Hall voltage on different components of the accelerator, etc. The results obtained are numerically analyzed and the main factors determining the ...
Electric Propulsion Laboratory Thermal vacuum testing of NASA's NEXT ion thruster in the Endurance Test Facility. Electric Propulsion Laboratory The ...
MIT is proposing to establish a new interdisciplinary Center for Accelerator Science and Technology (CAST) led by faculty from across the Schools of Science and Engineering that would carry out frontier R&D and have a strong educational program. The initial research focus includes development of technologies relevant to major accelerator initiatives ...
A fire protection survey was conducted at Fermi National Accelerator Laboratory, Batavia, Illinois, on June 17 to 21, 24 to 28, 1985 and November 4 to 8, 1985 to review the facility fire protection program and to make recommendations. A number of improvements have been made in Laboratory fire protection systems since the Fire ...
... Company, Inc. BHT-HD-600 laboratory Hall thruster on spacecraft, a number of plume properties have been measured. These ...
Jan 22, 2011 ... About DSpace � BEACON eSpace at Jet Propulsion Laboratory >. Items for Subject " Hall Effect magnetoresistance magnetic percolation" ...
The Advanced Photon Source at Argonne National Laboratory is now providing researchers with extreme-brilliance undulator radiation in the hard x-ray region of the spectrum. All technical facilities and components are operational and have met design specifications. Fourteen research teams, occupying 20 sectors on the APS experiment hall floor, are currently ...
The nuclear physics experiments at the Thomas Jefferson National Accelerator Facility often require longitudinally polarized electrons to be simultaneously delivered to three experimental halls. The degree of longitudinal polarization to each hall varies as function of the accelerator settings, making it ...
Stanford Linear Accelerator Center (SLAC) is a single mission laboratory dedicated to basic research in high energy particle physics. SLAC site also houses Stanford Synchrotron Radiation Laboratory (SSRL) which is a multi-mission laboratory for research using beams of ultraviolet light and low energy photons as ...
Stanford Linear Accelerator Center (SLAC) is a single mission Laboratory dedicated to basic research in high energy particle physics. SLAC site also houses Stanford Synchrotron Radiation Laboratory (SSRL) which is a multi-mission laboratory for research using beams of ultraviolet light and low energy photons as ...
... The identification of alpha particles with the aid of ... Descriptors : (*PARTICLE ACCELERATORS, OPERATION), (*PROTON ACCELERATORS ...
As part of the planned Jefferson Laboratory's electron accelerator (CEBAF) power upgrade, ten additional superconducting RF cryomodules will be added to its accelerator linacs. Although physically the same size as each of the original 40 linac cryomodules, each new cryomodule will have approximately 4 times the ...
... Title : The Correlation Between Accelerated Laboratory Corrosion Tests and Atmospheric Corrosion Station Tests on Steels,. ...
The Corrosion Technology Laboratory at Kennedy Space Center has the facilities, equipment, and experience to conduct indoor accelerated laboratory testing. ...
With the successful completion of the main accelerator in 1994 the alignment emphasis at the Thomas Jefferson National Accelerator Facility (formerly CEBAF) switched to the continuing installation and upgrades in the three experimental halls. This presentation examines the techniques used in completing the CEBAF machine and also gives ...
The LCLS at the SLAC National Accelerator Laboratory will be the world's first source of an intense hard x-ray laser beam, generating x-rays with wavelengths of 1nm and pulse durations less than 100fs. The ultrafast x-ray pulses will be used in pump-probe experiments to take stop-motion pictures of atoms and molecules in motion, with pulses ...
Hall thrusters are widely used as space electric propulsion devices. Due to the complex plasma phenomenon and high computation cost, currently it is difficult to fully simulate the real physical process in Hall thrusters. Recently, Szabo and Taccogna have proposed two different methods to simplify and accelerate the simulation, ...
The divergence of an ion beam in a cylindrical accelerator with a closed Hall current is considered under the assumption that the Hall current does not substantially change the external magnetic field. It is shown that the tangent of the angle of inclination of the ion trajectories to the cylinder axis is on the order of the ratio of ...
The general principle of charged particle acceleration in space and laboratory plasmas is illustrated by a discussion of particular types of acceleration mechanisms which can be classified as either deterministic processes or stochastic processes. Acceler...
. Dogwood Apartments Physical Therapy Building Archaeological Research, Center for Forensics Laboratory Wehr. Dogwood Apartments Physical Therapy Building Archaeological Research, Center for Forensics Laboratory Wehr Plaster Sports Complex, Robert W. Pummill Hall Power House Karls Hall Art Annex Hill ...
The SSC, with an energy of 20 TeV/Beam, requires a sequence of individual accelerators of increasing energy in the injector chain. These are the Linac, Low Energy Booster, Medium Energy Booster, and High Energy Booster. Each accelerator system must be completed in sequence in order to provide beam to the next higher energy accelerator. ...
The first flight test of the variable specific impulse magnetoplasma rocket (VASIMR) is tentatively scheduled for the Radiation and Technology Demonstration (RTD) in 2003. This mission to map the radiation environment out to several earth radii will employ both a Hall thruster and a VASIMR during its six months duration, beginning from low earth orbit. The mission will be ...
Variable plasma jet velocity with low beam divergence over a range of mass flow rates can be achieved through segmented electrode operation of Hall plasma accelerator. With the use of just a cathode side electrode at the cathode potential, the beam diverg...
The primary objective of our existing grant, as stated in our original proposal, was to (i) develop a better understanding of the electron transport in Hall thrusters; (ii) greatly reduce or eliminate the influence of the walls on the electron transport; ...
Plasma perturbations in the acceleration channel of a Hall thruster are found to be unstable in the presence of collisions. Both electrostatic lower-hybrid waves and electromagnetic Alfven waves transverse to the applied electric and magnetic field are fo...
The paper presents the results on studying the radiation conditions caused by induced radioactivity of the accelerator units in the ring hall. The data on the induced radioactivity level just on the ring vacuum chamber are reported. Radiation conditions i...
A Hall thruster with a shared magnetic structure including a plurality of plasma accelerators each including an anode and a discharge zone for providing plasma discharge. An electrical circuit having one or more cathodes connected to the plurality of plas...
And attractions such as Central Park, Fifth Avenue, Carnegie Hall, and Radio City Music Hall are all just minutes away from our conference facilities. We look forward to...
... kW-Class Laboratory Model Closed-Drifted Hall Thruster. ... plasma of a closed-drift Hall thruster ... measure plasma oscillations and electron density ...
Chattanooga, Tennessee campus in Holt Hall. In addition to classroom and office space, the department has research and teaching laboratories, a scanning ...
Page 1. UNCLASSIFIED AD 285 2 6 7 ARMED SERVICES TECHNICAL INFORMATION AGENCY ARLINGTON HALL STATION ...
RHESSI measurements relevant to the fundamental processes of energy release and particle acceleration in flares are summarized. RHESSI's precise measurements of hard X-ray continuum spectra enable model-independent deconvolution to obtain the parent electron spectrum. Taking into account the effects of albedo, these show that the low energy cut-off to the electron power-law ...
Tables are given of beam characteristics for particle accelerators at Argonne National Laboratory, Brookhaven National Laboratory, Cornell University, Fermi National Accelerator Laboratory, and the Stanford Linear Accelerator Center. Characteristics given...
Quicktime movie of lecture and demonstration (with transcription) in two compressions densities for: * High speed connections and * Slower connections. "This is a demonstration of a vacuum artifact transport system that we have developed at NIST. A sensitive, delicate gallium arsenide semi-conductor specimen that's making, or has just begun its journey, from a UHV (ultra-high vacuum) system on my ...
NSDL National Science Digital Library
For krypton to become a realistic option for Hall thruster operation, it is necessary to understand the performance gap between xenon and krypton and what can be done to reduce it. A floating emissive probe is used with the Plasmadynamics and Electric Propulsion Laboratory's High-speed Axial Reciprocating Probe system to map the internal plasma ...
Plasma thrusters are known to have some advantages like high specific impulse. Electric propulsion is already recognized as a successful technology for long duration space missions. It has been used as primary propulsion system on earth-moon orbit trnsfer missions, comets and asteroids exploration and on commercially geosyncronous satellite attitude control systems. Closed Drift Plasma Thrusters, ...
Laboratory Brookhaven National Laboratory Fermi National Accelerator Laboratory Idaho National Engineering and Environmental Laboratory Lawrence Berkeley National Laboratory...
On3.va few years ago, vacuum was an art, a cookbook type of black ...... accelerator cave, and the magnet hall which will contain the beam transport ...
... By passing this emission ... The millimeter-wave diagnostics will be further refined for measurements ... of the thruster, where the tight cyclotron orbit of ...
... Ion velocities were interrogated from the acceleration channel exit plane to a distance 107 mm from ... Both axial and radial velocity were measured. ...
... 5a. CONTRACT NUMBER Millimeter Wave Plasma Interferometry in the Near Field of a Hall Plasma Accelerator (PREPRINT) 5b. ...
... Accession Number : ADA456676. Title : Millimeter Wave Plasma Interferometry in the Near Field of a Hall Plasma Accelerator (PREPRINT). ...
career. A member of the National Inventor's Hall of Fame, Alvarez developed the proton linear accelerator, patented three types of radar still used today, designed an...
reduction, for comparatively quiescent plasma injection. Instabilities for Hall Accelerators Using. Magnetic Nozzle Effects ...
... of the LINAC '86, Stanford Linear Accelerator Center, 1986, p. 17. ... Dr. M. Allen 3291 Chamberlin Hall University of Wisconsin ... Dr. William Colson ...
In an end-Hall source, an ion beam is extracted from a magnetized plasma and accelerated by the plasma electric field without grids. The principle of end-Hall sources is similar to that of Hall effect thrusters (or closed-drift thrusters), but their design is optimized for processing applications (ion beam assisted ...
... Volume 6. Arnold Engineering Development Center, Civil Engineering Laboratory, Frank J. Seiler Research Laboratory, Wilford Hall Medical ...
... Arnold Engineering Development Center, Civil Engineering Laboratory, Frank J. Seiler Research Laboratory, Wilford Hall Medical Center. ...
... and an reduced magnetic field condition. ... which allows for non-resonant fluorescence collection ... Laboratory (AFRL) Electric Propulsion Laboratory at ...
Avenue JamesStreet ForestAvenue Mill Street ElizabethStreet RawlingsAvenue PoplarAvenue ThompsonStreet Whitney Education Building Pulliam Hall Allyn Bldg. Parkinson Laboratory Anthony Hall Davies Hall Rainbow's End Building Thompson Woods Lawson Hall Neckers Building Parking Garage Pulliam ...
Plans for the construction of the first stage of the Institute were finished. The buildings to be constructed are the accelerator block, a physical and chemical laboratory block, a small services block, and an administrative block housing in addition the library, lecture hall, and cafeteria. The 3-Mev proton-electron Van de ...
The current interlock system at the Nuclear Structure Lab (NSL) at the University of Notre Dame requires multiple procedures to be performed in order to start up one of the three accelerators. New features and equipment will be added to the current interlock system to allow access into the experimental rooms safely. This change is necessary because the planned addition of ...
CEBAF is in the process of migrating its accelerator and experimental hall control systems to one based upon EPICS, a control system toolkit developed by a collaboration among several DOE laboratories in the US. The new system design interfaces existing CAMAC hardware via a CAMAC serial highway to VME-based I/O controllers running the ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... Accelerated Laboratory Corrosion Tests to Out ...
... of accelerated flow through a uniform diameter smooth tube is ... Verma, RP, "The Motion of Discrete Particles Along the ... Hydrodynamics Laboratory ...
... operational warfare, joint planning, national and international ... of a gas gun accelerator for dynamic warhead tests in the Laboratory for Ballistic ...
... science, operational warfare, joint planning, national and international ... represent those most widely specified today by accelerator laboratories. ...
Combining constraints from particle accelerators with the requirement that the ..... In the case of pseudoscalar Higgs boson exchange there are no loops of ...
... Title : Effect of Entrained Air on Resistance to Accelerated Laboratory Freezing-and -Thawing of Concrete Specimens Made with Expanded ...
... of 26 months of operating, repairing, and maintaining the nuclear accelerator Superhilac at the Lawrence Berkeley Laboratory (LBL) are analyzed ...
Hurricane Isabel was at category five--the most violent on the Saffir-Simpson scale of hurricane strength--when it began threatening the central Atlantic seaboard of the US. Over the course of several days, precautions against the extreme weather conditions were taken across the Jefferson Lab site in south-east Virginia. On 18 September 2003, when Isabel struck North Carolina's Outer ...
This interactive game is from Fermilab's Fermilabyrinth project, which aims to "develop an understanding of the operations and experiments that take place in the Fermilab accelerator and detector halls and the scientific ideas they explore." In it, visitors can add or subtract slabs of lead and uranium to stop all particles in the ...
Plasma perturbations in the acceleration channel of a Hall thruster are found to be unstable in the presence of collisions. Both electrostatic lower-hybrid waves and electromagnetic Alfven waves transverse to the applied electric and magnetic field are found to be unstable due to collisions in the E X B electron flow. These results are obtained assuming a ...
The cylindrical Hall thruster features high ionization efficiency, quiet operation, and ion acceleration in a large volume-to-surface ratio channel with performance comparable with the state-of-the-art annular Hall thrusters. These characteristics were demonstrated in low and medium power ranges. Optimization of miniaturized ...
The dynamics of the ions and neutral particles of a multicomponent plasma in an accelerator with closed electron drift orbits and an extended acceleration zone is analyzed in the kinetic approximation. Reactions induced by electron impact are taken into account. The electron temperature is calculated in the hydrodynamic approximation. Boundary conditions ...
The upcoming parity violating deep inelastic scattering (PVDIS) experiment E08-011 in Hall A at Thomas Jefferson National Accelerator Facility (Jefferson Lab) aims to measure a combination of the axial hadronic couplings of the electron with a factor of six improvement in precision over world data. Precise data for the couplings are essential to search for ...
... PENNSYLVANIA Aviation Medical Acceleration Laboratory, ... C ontr ol Performance Under Acceleration W~itfh Side-Arm Attitude Contr -ollers ...
