A5074568062- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Radiation Effects in Electronics
- Graphite, nuclear technology, radiation studies
- Electrostatic Discharge in Electronics
- Gyrotron and Vacuum Electronics Research
- Nuclear Physics and Applications
- Software Reliability and Analysis Research
- Power Line Communications and Noise
- Advanced Photonic Communication Systems
- Advanced Optical Sensing Technologies
- Laser Design and Applications
- Muon and positron interactions and applications
- Pulsed Power Technology Applications
- Photocathodes and Microchannel Plates
- Telecommunications and Broadcasting Technologies
- Superconducting Materials and Applications
- Nuclear and radioactivity studies
- Advanced Measurement and Metrology Techniques
- Real-time simulation and control systems
- Magnetic confinement fusion research
- Radiation Therapy and Dosimetry
- Advancements in PLL and VCO Technologies
- Advanced Frequency and Time Standards
- Advancements in Photolithography Techniques
Thomas Jefferson National Accelerator Facility
1993-2024
Oak Ridge National Laboratory
2015-2020
Continuous Electron Beam Accelerator Facility
1997
The Polarized Electrons for Positrons experiment at the injector of Continuous Electron Beam Accelerator Facility has demonstrated first time efficient transfer polarization from electrons to positrons produced by polarized bremsstrahlung radiation induced a electron beam in high-Z target. Positron up 82% have been measured an initial momentum 8.19 MeV/c, limited only polarization. This technique extends positron capabilities GeV MeV beams, and opens access physics wide community.
This review paper describes the energy-upgraded Continuous Electron Beam Accelerator Facility (CEBAF) accelerator. superconducting linac has achieved 12 GeV beam energy by adding 11 new high-performance cryomodules containing 88 cavities that have operated cw at an average accelerating gradient of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>20</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>MV</a:mi><a:mo>/</a:mo><a:mi...
This paper describes the design and implementation of a beam loss accounting system for CEBAF electron accelerator. samples current throughout path measures accurately. Personnel safety machine protection systems use this to turn off when hazardous losses occur.
The first three quarters of the CEBAF arc have been instrumented with beam position monitors. Thirty-seven monitors (of 450) installed and their noise measured. Resolution 100 /spl mu/m was obtained at lowest operating current 1 mu/A. update time system is sec, limited by computer interfacing, a potential bandwidth greater than 10 kHz.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Most accelerators in operation today use liquid helium based superconducting technology some capacity. Many of these facilities also fixed and portable oxygen monitors to detect an deficient atmosphere were the be accidentally released. When released, can expand 800 times its volume. Recent spill tests at Thomas Jefferson National Accelerator Facility (Jefferson Lab) uncovered a fundamental flaw certain types deficiency monitoring equipment. The ensuing investigation found that problem is...
Since the CEBAF (Continuous Electron Beam Accelerator Facility) system requires amplifiers in distribution line, a diplexed reference signal such as that used at LANL would require series of discrete control loops, tied together with an overall loop. It was felt less complex be desirable. To accomplish this, frequency uses temperature regulated coaxial lines to provide high-level signals RF modules klystron galleries, combined lower power carried via phase stable fiber-optic cable.< <ETX...
Polarized positron beams have been identified as either an essential or a significant ingredient for the experimental program of both present and next generation lepton accelerators (JLab, Super KEK B, ILC, CLIC). An experiment demonstrating new method producing polarized positrons has performed at Continuous Electron Beam Accelerator Facility Jefferson Lab. The PEPPo (Polarized Electrons Positrons) concept relies on production e⁻/e⁺ pairs from bremsstrahlung radiation longitudinally...
This paper addresses international standards which can be applied to the requirements for accelerator personnel safety systems. Particular emphasis is given specify interlock systems employ programmable electronic subsystems. The work draws on methodologies currently under development medical, process control, and nuclear industries.
A reliability model for the Thomas Jefferson National Accelerator Facility (formerly CEBAF) personnel safety system has been developed. The model, which was implemented using an Excel spreadsheet, allows simulation of all or parts system. Modularity model's implementation rapid "what if" case studies to simulate change in parameters such as redundancy, diversity, and failure rates. Particular emphasis is given prediction modes would result both redundant interlock systems. In addition...
The CEBAF accelerator at Thomas Jefferson National Accelerator Facility (Jefferson Lab) uses a continuous electron beam with up to 800 kilowatts of average power. laboratory containment policy requires that in the event an errant striking blocking device, must be shut off by three methods less than 1 millisecond. One method implemented is gun. Two additional have been developed which use fast kickers deflect injector on water cooled aperture. designed and Lab are able 200 microseconds....
This paper presents the preliminary results and analysis of a comprehensive survey implementation accelerator safety interlock systems from over 30 international labs. At present time there is not self consistent means to evaluate both experiences level protection provided by electronic systems. research intended analyze strength weaknesses several different types system methodologies. Research, medical, industrial accelerators are compared. Thomas Jefferson National Accelerator Facility...