A5051790935- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Muon and positron interactions and applications
- Magnetic confinement fusion research
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Energy Harvesting in Wireless Networks
- Microwave Engineering and Waveguides
- Photocathodes and Microchannel Plates
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Semiconductor materials and devices
- Photonic and Optical Devices
- Electron and X-Ray Spectroscopy Techniques
- Physics of Superconductivity and Magnetism
- Electromagnetic Compatibility and Measurements
- Spacecraft and Cryogenic Technologies
- HVDC Systems and Fault Protection
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Electrostatic Discharge in Electronics
- Advanced X-ray Imaging Techniques
- Pulsed Power Technology Applications
Thomas Jefferson National Accelerator Facility
2015-2024
Brookhaven National Laboratory
2021-2023
California Polytechnic State University
2020
William & Mary
2019
Williams (United States)
2019
General Atomics (United States)
2019
Cytel (United States)
2018
Muons (United States)
2016
Chinese Academy of Sciences
2016
University of Chinese Academy of Sciences
2016
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.
A conceptual design is presented of a novel energy-recovering linac (ERL) facility for the development and application energy recovery technique to linear electron accelerators in multi-turn, large current regime. The main characteristics powerful experiment (PERLE) are derived from Large Hadron Collider, an beam upgrade under study LHC, which it would be key demonstrator. PERLE thus projected as investigate efficient, high (HC) (>10 mA) ERL operation with three re-circulation passages...
Superconducting radio-frequency cavities are commonly used in modern particle accelerators for applied and fundamental research. Such typically made of high-purity, bulk Nb with cooling by a liquid helium bath at temperature ∼2 K. The size, cost complexity operating accelerator refrigerator make the current cavity technology not favorable use industrial-type accelerators. We have developed multi-metallic 1.495 GHz elliptical conductively cooled cryocooler. has µm thick layer Nb3Sn on inner...
The higher efficiency of superconducting radio-frequency (SRF) cavities compared to normal-conducting ones enables the development high-energy continuous-wave linear accelerators (linacs). Recent progress in high-quality ${\mathrm{Nb}}_{3}\mathrm{Sn}$ film coatings along with availability cryocoolers high cooling capacity at 4 K makes it feasible operate SRF cooled by thermal conduction relevant accelerating gradients for use accelerators. A possible conduction-cooled linacs is environmental...
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.
We describe a model of damage in rf cavities and show how this can limit cavity operation. first present review mechanisms that may or not affect the ultimate fields be obtained cavities, assuming mechanical stress explains triggers breakdown events. method quantifying surface caused by events terms spectrum field enhancement factors, $\ensuremath{\beta}$, for asperities on surface. then an equilibrium develop between conditioning effects, determine performance experimental evidence...
Operation of the JLab IR Upgrade FEL at CW powers in excess 10 kW requires sustained production high electron beam by driver ERL. This turn demands attention to numerous issues and effects, including: cathode lifetime; control beamline RF system vacuum during current operation; longitudinal space charge; transverse matching irregular/large volume phase distributions; halo management; management remnant dispersive effects; resistive wall, wake-field, heating chambers; break up instability;...
Abstract We present the cost-effective production of superconducting radio frequency (SRF) cavities made medium grain (MG) niobium (Nb) discs directly sliced from forged and annealed billet. This method provides clean surface conditions reliable mechanical characteristics with sub-millimeter average size resulting in stable SRF cavity production. propose to apply this material particle accelerator science industrial applications. The applications require high field gradients(≥ 30 MV/m)...
Niobium, with its very high H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C1</sub> , has been used in superconducting radio frequency (SRF) cavities for accelerator systems 40 years continual improvement. The quality factor of (Q) is governed by the surface impedance R xmlns:xlink="http://www.w3.org/1999/xlink">BCS</sub> which depends on quasiparticle gap, delta, and superfluid density. Both these parameters are seriously affected...
The next high-current Electron-Ion Collider (EIC) is a new accelerator to be built at Brookhaven National Laboratory in collaboration with Thomas Jefferson Accelerator Facility. In the EIC Electron Storage Ring (ESR), there will beam currents of up 2.5 A, which excite massive higher-order-mode (HOM) power 17 single-cell 591 MHz superconducting radio-frequency (SRF) cavities. Damping HOM ESR SRF cavities challenge. A room temperature cylindrical shell shape silicon carbide (SiC) beamline...
We present a capture concept for the continuous wave (CW) polarized positron injector Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (Ce+BAF). This two-step is based on (1) generation of bremsstrahlung radiation by longitudinally electron beam 1 mA, 120 MeV, 90% polarization), passing through tungsten target, and (2) production e+e--pairs these photons in same target. To provide highly-polarized beams (>60% polarization) or high-current (>1 µA) with low polarization...
We present an updated design for a proposed source of ultra-fast synchrotron radiation pulses based on recirculating superconducting linac, in particular the incorporation EUV and soft x-ray production. The project has been named LUX - Linac-based Ultrafast X-ray facility. produces intense with duration 10-100 fs at 10 kHz repetition rate, synchronization 10's fs, optimized study dynamics. photon range covers to hard spectrum by use seeded harmonic generation undulators, specialized...
We report on techniques developed for producing electromagnetic, thermal, and structural solutions to RF cavity design problems in ANSYS, using one model. Methods preparing imported geometry from solid modeling programs are discussed, meshing suggested. A study of mesh density is presented, comparing size with heat flux Q factor convergence. The general analysis protocol presented a stepwise fashion, describing the macros that used conducting calculations. Finally, these applied proposed NLC...
The treatment of flue gases from power plants and municipal or industrial wastewater using electron beam irradiation technology has been successfully demonstrated in small-scale pilot plants. energy requirement is rather modest, on the order a few MeV; however, adoption at an scale requires availability high power, 1 MW, cost effective way. In this article we present design compact superconducting accelerator capable delivering cw with current A MeV. main components are rf-gridded thermionic...
We describe the development and fabrication of first high-power RF cavity for PEP-II. Design choices technologies subsequent production cavities are described. Conditioning testing discussed, as well integration into modular systems both high-energy low-energy rings. Plans installation raft assemblies in sections PEP tunnel also considered.
The MuCool Experiment has been continuing to take data with 805 and 201 MHz cavities in the Test Area. system uses RF power sources from Fermilab Linac. Although experimental program is primarily aimed at Muon Ionization Cooling (MICE), we have studying dependence of limits on frequency, cavity material, high magnetic fields, gas pressure, coatings, etc. general aim understanding basic mechanisms involved. cavity, essentially a prototype for MICE, was made using cleaning techniques similar...
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...
Abstract This article discusses a proposed Higgs-Energy LEptoN (HELEN) e + - linear collider based on advanced traveling wave superconducting radio frequency technology. The offers cost and AC power savings, smaller footprint (relative to the ILC), could be built at Fermilab. After initial physics run 250 GeV, upgraded either higher luminosity or higher, up 500 energies.