A5001678442- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Physics of Superconductivity and Magnetism
- Plasma Diagnostics and Applications
- Particle Detector Development and Performance
- Photocathodes and Microchannel Plates
- Advanced Frequency and Time Standards
- Laser-Plasma Interactions and Diagnostics
- Microwave Engineering and Waveguides
- Bluetooth and Wireless Communication Technologies
- Spacecraft and Cryogenic Technologies
- Energy Harvesting in Wireless Networks
- Radiation Therapy and Dosimetry
- Laser Design and Applications
- Atomic and Molecular Physics
- International Science and Diplomacy
- Electromagnetic Simulation and Numerical Methods
- Structural Analysis and Optimization
- Pulsed Power Technology Applications
- Metal and Thin Film Mechanics
- Muon and positron interactions and applications
- Acoustic Wave Resonator Technologies
Thomas Jefferson National Accelerator Facility
2013-2024
Old Dominion University
2014-2024
Dominion University College
2014-2024
Dominion (United States)
2009-2023
Air Vehicle Integrated Design (United States)
2011
Stony Brook University
1979-2007
Brookhaven National Laboratory
2007
Argonne National Laboratory
1988-2003
Continuous Electron Beam Accelerator Facility
1996
California Institute of Technology
1976-1987
This report presents a brief summary of the science opportunities and program polarized medium energy electron-ion collider at Jefferson Lab comprehensive description conceptual design such based on CEBAF electron accelerator facility.
The increase in the microwave surface resistance Rs of high Tc superconductors at elevated power levels is reported for both oriented and unoriented Tl-based films as a function rf magnetic field 820 MHz 18 GHz. application dc fields produces qualitatively similar increases reactance Xs. with shown to arise from simple decoupling grains by intergranular flux. power, on other hand, consequence hysteretic processes.
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...
The applicability of superconducting TEM-class spoke cavities to high-energy ion linacs is discussed, and detailed designs for two TEM-class, triple-spoke-loaded niobium resonant are presented. 345 MHz have a velocity range $0.4<\ensuremath{\beta}<0.75$ beam aperture 4 cm. Spoke-loaded offer several advantages compared with the higher-frequency elliptical-cell that currently being developed this particle velocities. proposed triple-spoke can provide broader acceptance, more accelerating...
Films nominally 80 μm thick of Bi-Sr-Ca-Cu-O on silver substrates with surface areas from 1.25 to 182 cm2 were fabricated using two different processing procedures. Their rf resistances measured as functions temperature in the frequency range 2.65–29.2 GHz at low field amplitudes cylindrical resonant cavities. The critical temperatures films 81–83 K. At X-band frequencies, matched that room-temperature copper. results comparable recent data small pellets bulk Bi-Sr-Ca-Cu-O.
Cylindrical rods of YBa2Cu3O7−δ from 0.6 to 1.9 mm in diameter and up 565 long have been used as the center conductor a half-wave resonant coaxial line. The line can be immersed liquid nitrogen, which provides excellent cooling current-carrying superconducting surface, even presence substantial rf losses. Such lines operated at frequencies few hundred MHz surface magnetic fields 150 G 77 K.
Deflecting/crabbing cavities serve a variety of purposes in different accelerator applications, primarily separating single beam into multiple beams and rotating bunches for head-on collisions at the interaction point particle colliders. are also used transverse longitudinal emittance exchange beams, x-ray pulse compression, diagnostics. Compact superconducting deflecting/crabbing under development due to strict dimensional constraints requirements higher field gradients with low surface...
A microprocessor-based feedback system has been designed, built and tested to provide phase amplitude stabilization of a 150 MHz superconducting splitring accelerating resonator for heavy ions. This bandwidth 400 kHz can operate with positive as limiter or negative locking an external reference. Direct already used stabilize the split-loop accuracy 0.01 radian at 2 MV/m.1 All parameters system: gains, shifts, level reference, reference frequency synthesizer are digitally controlled either...
To date, superconducting spoke cavities have been designed, developed, and tested for particle velocities up to ${\ensuremath{\beta}}_{0}\ensuremath{\sim}0.6$, but there is a growing interest in possible applications of multispoke high-velocity applications. We explored the design parameter space low-frequency, high-velocity, double-spoke order determine how each affects electromagnetic properties, particular surface fields shunt impedance. present detailed operating at 325 352 MHz optimized...
Previous work on calculating energy spectra from Compton scattering events has either neglected considering the pulsed structure of incident laser beam, or calculated these effects in an approximate way subject to criticism. In this paper, problem been reconsidered within a linear plane wave model for beam. By performing proper Lorentz transformation Klein-Nishina cross section, spectrum calculation can be created which allows electron beam spread and emittance accurately calculated,...
Recent applications in need of compact low-frequency deflecting and crabbing cavities have initiated the design development new superconducting structures operating at high gradients with low losses. Previously, ${\mathrm{TM}}_{110}$-type were developed also been operated successfully. However, these geometries are not favorable designs for frequencies. The rf-dipole cavity is first geometry that has demonstrated shunt impedance. Since fundamental mode lowest widely separated from nearest...
High surface electric fields have been obtained in the first tests of a superconducting rf quadrupole device. The were generated between niobium vanes 6.5 cm length, with an edge radius 2 mm, and beam aperture 6 mm diameter. In at 4.2 K, 64 MHz device operated cw peak 128 MV/m. Virtually no electron loading was observed below 100 It possible to operate 210 MV/m pulses 1 ms duration using 2.5 kW source. For vane geometry tested, more than 10 square centimeters support field greater 90% field....
The Old Dominion University Compact Light Source (ODU CLS) design concept is presented---a compact Inverse Compton (ICLS) with flux and brilliance orders of magnitude beyond conventional laboratory-scale sources greater than other ICLS designs. This utilizes the physics inverse scattering an extremely low emittance electron beam by a laser pulse rms length approximately two-thirds picosecond ($2/3\text{ }\text{ }\mathrm{ps}$). accelerator composed superconducting radio frequency (SRF)...
An investigation was conducted of the RF properties high-T/sub c/ superconductors over a wide range temperatures, frequencies and field amplitudes. Both bulk polycrystalline samples thick films on silver substrates were tested. At 150 MHz 4.2 K, surface resistances 18 mu Omega at low 3.6 m an 270 G measured. All showed strong dependence resistance field. However, no breakdown superconducting state observed up to highest achieved (320 G).< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We report progress on the R&D program for electron-cooling of Relativistic Heavy Ion Collider (RHIC). This electron cooler is designed to cool 100 GeV/nucleon at storage energy using 54 MeV electrons. The source will be a superconducting RF photocathode gun. accelerator recovery linac. frequency set 703.75 MHz. maximum bunch 9.38 MHz, with charge 20 nC. has following components: photoinjector and its photocathode, linac cavity, start-to-end beam dynamics magnetized electrons, cooling...
Next generation light-sources, electron coolers, high-power FELs, Compton X-ray sources and many other accelerators were made possible by the emerging technology of high-power, high-brightness beams. In order to get anticipated performance level ampere-class currents, technological barriers are yet be broken. BNL's Collider-Accelerator Department is pursuing some these technologies for its cooling RHIC application, as well a future electron-hadron collider. We will describe work on CW,...
We present the design and parameters of an energy recovery linac (ERL) facility, which is under construction in Collider-Accelerator Department at BNL. This R&D facility has goal demonstrating CW operation ERL with average beam current range 0.1 - 1 ampere very high efficiency recovery. The possibility a future upgrade to two-pass also being considered. heart 5-cell 703.75 MHz super-conducting RF strong Higher Order Mode (HOM) damping. flexible lattice provides test-bed for exploring issues...