A5034733305- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Gyrotron and Vacuum Electronics Research
- Spacecraft and Cryogenic Technologies
- Atomic and Molecular Physics
- Muon and positron interactions and applications
- Graphite, nuclear technology, radiation studies
- Radiation Therapy and Dosimetry
- Nuclear and radioactivity studies
- Ion-surface interactions and analysis
- Electrostatic Discharge in Electronics
- High voltage insulation and dielectric phenomena
- Membrane Separation and Gas Transport
- Pulsed Power Technology Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced Mathematical Modeling in Engineering
- Laser-Matter Interactions and Applications
- Particle Detector Development and Performance
- Internet of Things and Social Network Interactions
Oak Ridge National Laboratory
2010-2022
Oak Ridge Associated Universities
2022
Fermi National Accelerator Laboratory
2021-2022
Illinois Institute of Technology
2021
Spallation Neutron Source
2002-2018
Michigan State University
2005-2011
Studieförbundet Näringsliv och Samhälle
2010-2011
National Superconducting Cyclotron Laboratory
2006-2009
The Spallation Neutron Source project includes a superconducting linac section in the energy range from 186 MeV to 1000 MeV. For this two types of cavities are needed with geometrical /spl beta/ values beta/=0.61 and beta/=0.81. An aggressive cavity prototyping program is being pursued at Jefferson Lab, which calls for fabricating testing four beta/=0.81 cavities. Both consist six cells made high purity niobium feature one HOM coupler TESLA type on each beam pipe port power coaxial input...
The Spallation Neutron Source (SNS) makes use of superconducting cavities for the acceleration negative H ions in main linac. Two types 6-cell Niobium are used portion linac: 33 /spl beta/=0.61 and 48 beta/=0.81 cavities. Each cavity is powered via a coaxial fundamental power coupler (FPC) simple yet robust design. electromagnetic design components that has been modeled some those properties have measured experimentally. Modeling includes impedance matching window waveguide to doorknob...
An in-situ plasma processing technique has been developed at the Spallation Neutron Source (SNS) to improve performance of superconducting radio-frequency (SRF) cavities in operation. The uses a low-density reactive neon-oxygen room-temperature surface work function, help remove adsorbed gases on RF surface, and reduce its secondary emission yield. SNS SRF have six accelerating cells typically ignites cell where electric field is highest. This article details ignite monitor each cavities.
A new electron cyclotron resonance ion source (ECRIS) was constructed at the NSCL/MSU to replace existing SC-ECRIS. This ECRIS operates 18+14.5 GHz microwave frequencies with a planned upgrade 24-28 in second phase of commissioning. superconducting hexapole coil system produce radial magnetic field; axial trapping is produced six solenoid coils enclosed an iron yoke allow optimization distance between plasma electrode and resonant zone plasma. We report details design, construction, initial...
The National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU) is constructing ReA3 to reaccelerate rare-isotope beams available from gas stopping of fast radio-nuclides produced by projectile fragmentation energies ∼ 0.3-3 MeV/nucleon. Such are unavailable worldwide, but in demand for Coulomb excitation and transfer reaction studies as well the study astrophysical reactions. consists four main components: an electron-beam ion trap (EBIT), achromatic mass...
We present an analysis of spatial chirp in subcycle pulsed beams corroborated by spatiotemporal electro-optic sampling measurements terahertz radiation. Modeling the beam as a superposition monochromatic Gaussian beams, free-space propagation is shown to directly lead lateral with spectrum on-axis substantially bluer than overall energy spectrum. The two-transverse $+$ one-temporal dimensional profile from organic crystals DSTMS and OH1 are measured compared observed spatiospectral...
Based on the Higher Order Mode (HOM) field properties, Spallation Neutron Source (SNS) HOM damping requirements have been determined by bunch tracking simulations. Transverse instabilities are found to be absent and transverse error magnifications acceptable if loaded cavity Q for each mode is less than 10/sup 8/ expected cavity-to-cavity frequency variation due manufacturing tolerances present. Longitudinal 8/, non-pi fundamental has value, Each of two types three longitudinal modes that...
Solenoids are widely used to provide initial focusing of beams extracted from an ion source. However, in the case electron cyclotron resonance (ECR) source, beam will usually include different species and for each them a wide distribution charge states. When such multicomponent is focused by solenoid, ions with Q/A larger than interest overfocused go through waist before reaching analyzing magnet. If currents obtained these sufficient, resulting space forces can significantly degrade...
Elliptical SRF cavities operated in pulsed mode experience dynamic Lorentz detuning because of the time varying radiation pressure. Due to narrow electromagnetic bandwidth these resonators, induced can severely affect their matching conditions RF feeding system. The active compensation scheme using piezoelectric tuners has proven be a viable and attractive method minimize effects detuning. To optimize this compensation, mechanical parameters are extracted for action forces tuner from both...