A5104977651- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Nuclear Materials and Properties
- Nuclear Engineering Thermal-Hydraulics
- Plasma Diagnostics and Applications
- Nuclear and radioactivity studies
- Gyrotron and Vacuum Electronics Research
- Metallurgical Processes and Thermodynamics
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Iron and Steelmaking Processes
- Radiation Detection and Scintillator Technologies
- Radiative Heat Transfer Studies
- Heat Transfer and Boiling Studies
- Thermodynamic and Structural Properties of Metals and Alloys
- Healthcare Systems and Reforms
- Gas Dynamics and Kinetic Theory
- Probabilistic and Robust Engineering Design
- Heat transfer and supercritical fluids
- Matrix Theory and Algorithms
- Molten salt chemistry and electrochemical processes
Oak Ridge National Laboratory
2004-2024
Fermi National Accelerator Laboratory
2012-2014
Cornell University
2002
Thin carbon foils are used as strippers for charge exchange injection into high intensity proton rings. However, the stripping become radioactive and produce uncontrolled beam loss, which is one of main factors limiting power in Recently, we presented a scheme laser an ${\mathrm{H}}^{\ensuremath{-}}$ Spallation Neutron Source (SNS) ring. First, atoms converted to ${\mathrm{H}}^{0}$ by magnetic field, then excited from ground state upper levels laser, states protons field. In this paper...
Finding self-consistent distributions of beam particles interacting with each other via the space charge force is one challenges accelerator physics. Exactly solvable models are used for simulation benchmarks, instability threshold calculations, etc. Since such have been found only in and two dimensions (Kapchinsky-Vladimirsky distribution), it not possible to apply them a general three dimensional motion. This paper shows how construct new sets distributions, extending even case.
The electron beam probe method was suggested for measuring profiles in high power beams. In this method, deflection of a low energy by the collective field intensity is measured. charge density can be restored under certain conditions or estimated various mathematical techniques. We studied feasibility using SNS accumulator ring computer simulations diagnostic setup. Realistic proton distributions were used simulations. Several profile calculation techniques explored and results are reported paper.
The Consortium for Advanced Simulation of Light Water Reactors (CASL) Virtual Environment Reactor Applications (VERA) offers unique capabilities to combine highfidelity in-core radiation transport with temperature feedback using MPACT and CTF a follow-on fixed source calculation the Shift Monte Carlo code calculate ex-core quantities interest. In these coupled calculations, provides fission calculation. past VERA releases, passed spatially dependent without energy distribution Shift. then...
To assist the beam commissioning in Spallation Neutron Source (SNS) linac, a general purpose Radio Frequency (RF) tuning application has been written to help set RF phase and amplitude. The method involves varying an Rf cavity amplitude settings over fairly large range comparing measured downstream response "signatures" model predictions. input for phase, amplitude, energy are varied best match observations. This scheme advantages other techniques of not requiring intercepting devices (e.g....
The Δt procedure is a time of flight technique for setting the phases and amplitudes accelerating fields in multi-cavity linac. It was initially proposed developed LAMPF linac early seventies [1,2] since then has been used several accelerators [3,4]. SNS includes four CCL modules (Side Coupled Structure) operating at 805 MHz energy range from 86.8 MeV up to 185.6 MeV. implemented initial beam commissioning three modules. A brief theory procedure, results design parameter calculations...
The Consortium for Advanced Simulation of Light Water Reactors (CASL) Virtual Environment Reactor Applications (VERA) is a reactor simulation software. It offers unique capabilities by combining high-fidelity in-core radiation transport with temperature feedback using MPACT (a deterministic neutron code) and COBRA-TF thermal-hydraulic follow-on, fixed-source calculations the Shift Monte Carlo code to calculate ex-core quantities interest. In these coupled calculations, provides fission...
The Spallation Neutron Source accelerator complex will have three beam dumps for tuning and the collection of controlled losses. linac extraction be used purposes are designed 7.5 kW power. optics issues these i) size at vacuum window which is near last quadrupole ii) guaranteeing dump due to multiple scattering in presence potentially large variations accumulator ring emittances. injection collect partially stripped H <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
One of the main sources electrons in Spallation Neutron Source's Accumulator Ring is stripped injection region. A magnetic field guides to bottom beam pipe, where an electron catcher with overhanging surface traps them. This paper describes electrons' motion, optimization catcher, and build up cloud this
The Spallation Neutron Source (SNS) accumulator ring is designed to accumulate, via H/sup -/ injection, protons of 2 MW beam power at 1 GeV kinetic energy a repetition rate 60 Hz. At such intensity, electron-cloud expected be one the intensity-limiting mechanisms that complicate operations. This paper summarizes mitigation strategy adopted in design, both suppressing formation and enhancing Landau damping, including tapered magnetic field monitoring system for collection stripped electrons...
Abstract In light water nuclear reactors, the reactor pressure vessel (RPV) plays critical role of containing and coolant is expected to maintain its integrity under a variety conditions. The RPV subjected high neutron flux temperature, which lead material embrittlement increase susceptibility fracture. degree highly dependent on local fluence, so it accurately characterize spatial distribution fluence in when performing probabilistic fracture mechanics (PFM) analysis, individually evaluates...