A5064443983- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Electron and X-Ray Spectroscopy Techniques
- Distributed and Parallel Computing Systems
- Gyrotron and Vacuum Electronics Research
- Advanced Data Storage Technologies
- Radiation Therapy and Dosimetry
- Quantum Chromodynamics and Particle Interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Advancements in Photolithography Techniques
- Silicon Carbide Semiconductor Technologies
- Nuclear Physics and Applications
- Scientific Computing and Data Management
- Laser-Plasma Interactions and Diagnostics
- Photocathodes and Microchannel Plates
- Quantum chaos and dynamical systems
- Plasma Diagnostics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
Brookhaven National Laboratory
2005-2024
Thomas Jefferson National Accelerator Facility
2011-2024
Dominion University College
2024
Old Dominion University
2011-2024
Williams (United States)
2024
William & Mary
2024
University of North Carolina Wilmington
2020
SLAC National Accelerator Laboratory
1992-2015
Island Institute
2010
Brookhaven College
1994-2010
Proton computed tomography (pCT) has the potential to improve accuracy of dose calculations for proton treatment planning, and will also be useful pretreatment verification patient positioning relative beam. A design study was performed define optimal approach a pCT system based on specifications applications in therapy. Conceptual detailed is presented; consists silicon-based particle tracking crystal calorimeter measure energy loss individual protons. We discuss formation images...
Proton–nucleus (p+A) collisions have long been recognized as a crucial component of the physics program with nuclear beams at high energies, in particular for their reference role to interpret and understand nucleus–nucleus data well potential elucidate partonic structure matter low parton fractional momenta (small-x). Here, we summarize main motivations that make proton–nucleus run decisive ingredient successful heavy-ion Large Hadron Collider (LHC) present unique scientific opportunities...
Conformal proton radiation therapy requires accurate prediction of the Bragg peak position. Protons may be more suitable than conventional x-rays for this task since relative electron density distribution can measured directly with computed tomography (CT). However, CT has its own limitations, which need to carefully studied before technique introduced into routine clinical practice. In work, we have used analytical relationships as well Monte Carlo simulation tool GEANT4 study principal...
Proton computed tomography (pCT) has been explored in the past decades because of its unique imaging characteristics, low radiation dose, and possible use for treatment planning on‐line target localization proton therapy. However, reconstruction pCT images is challenging path within object to be imaged statistically affected by multiple Coulomb scattering. In this paper, we employ GEANT4 ‐based Monte Carlo simulations two‐dimensional an elliptical phantom investigate algebraic technique...
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.
Proton therapy, long regarded as a superior method of radiation is now becoming more cost effective and being used in number clinical centers around the world. In light this development use proton beam itself should be considered for most accurate treatment planning. X-ray computed tomography (XCT), which widely available, has been planning therapy. The basic interactions XCT matter are fundamentally different than those protons. Thus, resulting density map from only an approximation true...
We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF electron will enable flux on order $1\times 10^4~K_L/sec$, which exceeds that previously attained SLAC by three orders magnitude. use deuteron target provide first measurements ever neutrons. experiment measure both differential cross sections and self-analyzed polarizations produced $Λ$, $Σ$, $Ξ$, $Ω$ hyperons using...
The Brookhaven Relativistic Heavy Ion Collider (RHIC) has been providing collisions of polarized protons at a beam energy 100 GeV since 2001. Equipped with two full Siberian snakes in each ring, polarization is preserved during acceleration from injection to GeV. However, the intrinsic spin resonances beyond are about factor 2 stronger than those below making it important examine impact these strong on survival and tolerance for vertical orbit distortions. Polarized were first accelerated...
The dynamics of a metastable beam particles ``injected'' into artificially excited resonance islands in the Fermilab Tevatron is studied. Evolution captured distribution measured by an externally detectable coherent signal. Dynamical partitions observed control space amplitude and tune focusing modulation are consistent with equivalent mode ensemble driven gravity pendula. model's single parameter, island ${\mathit{Q}}_{\mathit{I}}$ small oscillations, inferred as central frequency resonant...
Intense ion beams in the Brookhaven Relativistic Ion Collider lead to a rise vacuum pressure. Electron clouds can contribute such process. To measure electron cloud densities coherent tune shift along bunch train was observed with different spacings and intensities. From measured shifts, are computed compared obtained simulations.
Deuteron and gold beams have been accelerated to a collision energy of /spl radic/s = 200 GeV/u in the Relativistic Heavy Ion Collider (RHIC), providing first asymmetric-species collisions this complex. Necessary changes for mode operation include new ramping software asymmetric crossing angle geometries. This paper reviews machine performance, problems encountered their solutions, accomplishments during 16 weeks ramp-up operations.
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...
The dynamics of transverse particle oscillations in the Fermilab Tevatron, artificially made nonlinear, is studied by observing beam profiles over periods up to an hour. A ``diffusive'' model with amplitude-dependent diffusion coefficient gives a quantitatively accurate description evolution. evolution influenced strongly nonlinear resonance.
High energy hadron collider operation requires accurate measurements of the beta functions and phase advances, to check linear optics locate gradient errors. During RHIC 2003 run, two AC dipoles with vertical horizontal magnetic field were used measure at storage injection energies. The are set up adiabatically induce sizable coherent oscillations a frequency close betatron frequencies. advances then calculated from 1024 turn-by-turn available all BPMs (beam position monitors). Because...
Hadron therapy has entered a new age [1]. The number of facilities grows steadily, and "consumer" interest is high. Some groups are working on accelerator technology, while others optimize existing designs by reducing capital operating costs, improving performance. This paper surveys the current requirements directions in technology for hadron therapy.
In RHIC high intensity operation, two types of pressure rise are currently concern. The first type is at the beam injection, which seems to be caused by electron multipacting, and second one transition, where cloud not dominant cause. limiting might affect experiments background for very total intensity. this article, rises described, preliminary study results reported. Some unsettled issues questions raised, possible counter measures discussed.
During the summer of 2002, eight superconducting helical spin rotators were installed into RHIC in order to control polarization directions independently at STAR and PHENIX experiments. Without rotators, orientation interaction points would only be vertical. With four around each two experiments, we can rotate either or both beams from vertical horizontal plane through region then back on other side. This allows independent for beam with vertical, longitudinal, radial experiment. In this...