A5065278220- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Gyrotron and Vacuum Electronics Research
- Plasma Diagnostics and Applications
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Photonic and Optical Devices
- Advanced Antenna and Metasurface Technologies
- Energy Harvesting in Wireless Networks
- Muon and positron interactions and applications
- Photocathodes and Microchannel Plates
- Microwave Engineering and Waveguides
- Pulsed Power Technology Applications
- Physics of Superconductivity and Magnetism
- Antenna Design and Analysis
- Nuclear Issues and Defense
- Photonic Crystals and Applications
- Advanced X-ray Imaging Techniques
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Fiber Laser Technologies
- Spacecraft and Cryogenic Technologies
- Radiation Therapy and Dosimetry
Los Alamos National Laboratory
2011-2019
Thomas Jefferson National Accelerator Facility
1988-2003
Los Alamos National Security (United States)
2002
We report the results of recent high power testing superconducting radio frequency photonic band gap (PBG) accelerator cells. Tests two single-cell 2.1 GHz cavities were performed at both 4 and 2 K. An accelerating gradient $15\text{ }\text{ }\mathrm{MV}/\mathrm{m}$ an unloaded quality factor ${Q}_{0}$ $4\ifmmode\times\else\texttimes\fi{}{10}^{9}$ achieved. It has been long realized that PBG structures have great potential in reducing long-range wakefields accelerators. A structure confines...
The CEBAF (Continuous Electron Beam Accelerator Facility) physics program requires a large acceptance spectrometer covering nearly all of the 4 pi solid angle for studying complex electronuclear interactions. This device relies on six-coil toroidal magnetic field to provide momentum analysis. desire maximize coverage led thin superconducting toroid design. main has an outside diameter 4.6 m, active length 5 peak in volume 1.2 T, and stored energy 18 MJ. An intrinsically stable design was...
The LANL/AES normal-conducting radio-frequency injector has been tested at cw cathode gradients up to $10\text{ }\text{ }\mathrm{MV}/\mathrm{m}$. Field-emission electrons from a roughened copper are accelerated beam energy as high 2.5 MeV and impinge on stainless steel target. energies of the resulting bremsstrahlung photons measured varying levels cavity rf power corresponding different accelerating gradients. At low power, spectra exhibit well-defined end-point positions where number...
The DARHT-2 linear induction accelerator is designed to produce a 2 kA, 20 MV, /spl mu/s flat-top electron beam. injector driven directly by Marx bank, and may have risetime as large one microsecond. As result, there will be considerable amount of beam charge which mismatched the magnetic transport channel. Depositing some this near accelerating gaps could potentially cause insulator flashover. Deposition thermionic cathode lead poisoning desorbed neutrals ions. approach that has been...
The Continuous Electron Beam Accelerator Facility (CEBAF) is a new US Department of Energy (DoE) facility presently under construction in Virginia. CEBAF has elected to build particle spectrometers with superconducting magnets. Two high-resolution will be built from separated function dipoles and quadrupoles. These magnets modular, permitting interchangeability between various spectrometers. A third spectrometer, having large acceptance detector, using toroid. This toroid have 8 coils its...
The magnet system comprises six flat, kidney-shaped coils arranged radially to produce a toroidal field with peak value of 3.5 T. Features the design discussed include modular coil allowing single works testing, an indirectly cooled aluminum-stabilized conductor, support via in-plane warm tension links each vacuum case, out-of-plane load sensing for alignment and fault sensing, passive internal quench protection, integrated instrumentation control system.< <ETX...
The current design for the high-resolution spectrometers at CEBAF (Continuous Electron Beam Accelerator Facility) requires a front quadrupole that has gradient * length of 6.8 T with 'good field' aperture (1*10/sup -3/ uniformity in gradient) 16 cm radius. A room-temperature was found too power hungry and interferred beam. Engineering construction small cos 2 theta magnet considered to be quite expensive. Panofsky not due extreme sensitivity field quality errors conductor placement....
The design, manufacture and works testing of single coils has been reported at ASC, Chicago 1992 EPAC, London 1994. assembly, commissioning the full six-cell toroidal spectrometer magnet is described results compared with guaranteed or expected values. SURA contract number for this project 91-C1882LD.
Analysis of quench phenomena within a superconducting coil can be simulated using version M.N. Wilson's QUENCH code (1983). To design adequately, the event must anticipated. Quench characteristics are controlled by several parameters, such as dimensions, proportion copper, fraction superconductor, current density, and unit cell area. The criteria to minimize internal voltage maximum temperature rise in during quench. An excessive may cause overheating, thereby damaging insulation or...
The pair of high-resolution spectrometers at CEBAF (Continuous Electron Beam Accelerator Facility) require large-aperture, high-gradient quadrupoles. A superconducting cos 2 theta design is under consideration to meet these requirements. quadrupole has a coil diameter 1 m and peak gradient 5 T/m with an effective field length 1.8 m. stored energy this quad 3.0 MJ. details the coil, shrink fit support collar, cryostat are presented. analysis superconductor, quench behavior, protection system...
The 460-ton dipole for the Hall A 4-GeV/c High Resolution Spectrometer has a bend angle of 45 degrees , with an 8.4-m radius curvature and effective length 6.6 m. It useful width 100 cm 25-cm gap at central curvature. provides focusing in dispersive plane by means rotated (by 30 ) entrance exit pole faces as well field index -1.25. end contour geometries have been designed to eliminate higher-order aberrations. maximum is 1.6 T 4 GeV/c. quality 2*10/sup -4/ (maximum deviation from design...