A5030152644- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Pulsed Power Technology Applications
- Magnetic confinement fusion research
- Particle Detector Development and Performance
- Metal and Thin Film Mechanics
- Spacecraft and Cryogenic Technologies
- Cyclone Separators and Fluid Dynamics
- Advanced Data Storage Technologies
- Graphite, nuclear technology, radiation studies
- Wireless Power Transfer Systems
- Muon and positron interactions and applications
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Electrostatic Discharge in Electronics
- Nuclear Physics and Applications
- Advanced DC-DC Converters
- ZnO doping and properties
- Energy Harvesting in Wireless Networks
- High-Energy Particle Collisions Research
- Semiconductor materials and devices
- Plasma Diagnostics and Applications
- Astrophysics and Cosmic Phenomena
Thomas Jefferson National Accelerator Facility
2006-2024
Chiba University
2024
California Polytechnic State University
2020
The applications of magnetrons to high power proton and cw electron linacs are discussed. An experiment is described where a 2.45 GHz magnetron has been used drive single cell superconducting cavity. With the injection locked, modest phase control accuracy 0.95\ifmmode^\circ\else\textdegree\fi{} rms demonstrated. Factors limiting performance have identified.
Cooling of hadron beams is critically important in the next generation storage rings for delivery unprecedented performance. One such application electron-ion collider presently under development US. The desire to develop electron coolers operation at much higher energies than previously achieved necessitates use radio-frequency (RF) fields acceleration as opposed conventional, electrostatic approach. While cooling a mature technology low energy utilizing DC beam, RF requires beam be...
We describe the activities underway at JLab to develop new CW cryomodules capable of transporting up Ampere-levels beam currents for use in ERLs and FELs. Goals include an efficient cell shape, high packing factor real-estate gradient very strong HOM damping push BBU thresholds by two or more orders magnitude compared existing designs. Cavity ancillary components are optimized this application. Designs being developed low-frequency (750 MHz), Ampere-class compact FELs high-frequency (1.5...
Thomas Jefferson National Accelerating Facility, Lab, is producing 24 Superconducting Radio Frequency (SRF) cryomodules for the Spallation Neutron Source (SNS) cold linac. This includes one medium-/spl beta/ (0.61) prototype, 11 production, and 12 high beta (0.81) production cryomodules. After testing, prototype cryomodule was shipped to Oak Ridge Laboratory (ORNL) acceptance check out has been completed. All orders cavities components are being received at this time run started. Each of...
In recirculating accelerators, and in particular energy recovery linacs (ERLs), the maximum current can been limited by multipass, multibunch beam breakup (BBU), which occurs when electron interacts with higher-order modes (HOMs) of an accelerating cavity on pass again recovered pass. This effect is concern design modern high average accelerators utilizing superconducting RF technology. Experimental observations instability at Jefferson Laboratory 10 kW Free-Electron Laser (FEL) are...
The Thomas Jefferson national accelerator facility has begun a cryomodule refurbishment project. goal of this project is robust 6 GeV, 5 pass operation the continuous electron beam (CEBAF). scope includes removing, refurbishing and replacing 10 CEBAF cryomodules at rate three per year. Refurbishment reprocessing SRF cavities to eliminate field emission increase nominal gradient from original MV/m 12.5 MV/m. New "dogleg" couplers between cavity helium vessel flanges will intercept secondary...
In a previous paper the cavity [1] design for an Ampere-class cryomodule was introduced. We have since fabricated 1500 MHz version of single cell with waveguide couplers HOM and fundamental power, attached to one end cavity, 5-cell made from large grain niobium without and. 750 endgroups get some information about obtainable Q-values, gradients multipacting behavior at lower frequency. This contribution reports on various tests these cavities.
For an ongoing high current cryomodule project, a total of 5 higher order mode (HOM) absorbers are required per cavity. The load is designed to absorb Radio Frequency (RF) heat induced by HOMs in 748.5MHz Each targeted at 4 kW dissipation capability. Water cooling employed remove the generated ceramic tiles and surface losses on waveguide walls. A sequentially coupled RF-thermal-structural analysis was developed ANSYS optimize HOM design. Frequency-dependent dielectric material properties...
Abstract This paper proposes a high‐frequency multiple‐receiver wireless power transfer (WPT) system with load‐independent class‐E/F inverter. Each receiver has post‐regulator, which changes the equivalent resistance seen from inverter to obtain necessary for output voltage regulation. Because generates constant AC current ( ), transmitter supplies minimum required receivers by change of resistances. Besides, consistently achieves zero‐voltage switching (ZVS) without any control. As result,...
Ion complex-Ion source -SRF linac -Booster -Ion collider ring
A system using an Electron Cyclotron Resonance (ECR) plasma source for the deposition of a thin niobium film inside copper cavity superconducting accelerator applications has been designed and is being constructed. The uses 500-MHz as both substrate vacuum chamber. ECR will be created to produce direct ion deposition. central cylindrical grid DC biased control energy. This paper describes design several subcomponents including chamber, RF supply, biasing magnet coils. Operational parameters...
The U.S. electron ion collider will utilize high current and storage rings with many bunches large rf systems. Because of the dissimilarity two rings, transients created by gaps or variations in distributions be very different rings. These cause a shift synchronous phase beams as function bucket position, can impact luminosity through shifts longitudinal position IP, affect performance LLRF control loops, may require significant power overhead to control. A machine design that uses...