A5016659952- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Electron and X-Ray Spectroscopy Techniques
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Magnetic properties of thin films
- High-Energy Particle Collisions Research
- Physics of Superconductivity and Magnetism
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Laser-Plasma Interactions and Diagnostics
- Photocathodes and Microchannel Plates
- Gyrotron and Vacuum Electronics Research
- Crystallography and Radiation Phenomena
- Advanced NMR Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Biofield Effects and Biophysics
- Magnetic Properties and Applications
- Advanced X-ray Imaging Techniques
- Advanced Data Storage Technologies
- Plasma Diagnostics and Applications
- Theoretical and Computational Physics
- Advanced X-ray and CT Imaging
Brookhaven National Laboratory
2015-2024
Brookhaven College
2023
Thomas Jefferson National Accelerator Facility
2016
Tech-X Corporation (United States)
2007-2014
Lawrence Berkeley National Laboratory
2010
Indiana University Bloomington
2002-2003
RIKEN BNL Research Center
2002-2003
Miami University
1999-2000
In polarized proton collision experiments, it is highly advantageous to flip the spin of each bunch protons during stores reduce systematic errors. Experiments done at energies less than 2 GeV have demonstrated a spin-flip efficiency over 99%. At high energy colliders with Siberian snakes, single magnet flipper does not work because large tune spread and generation multiple, overlapping resonances. A more sophisticated flipper, constructed nine-dipole magnets, was used in BNL Relativistic...
The physics program at the future electron ion collider (EIC) calls for polarized neutron beams high energies. best carriers are $^{3}\mathrm{He}$ nuclei and deuterons. Both expected to be utilized by spin in EIC. Owing small magnetic moment anomaly of a deuteron particle, significantly higher fields required rotation, so that full Siberian snakes not feasible. However, resonance strengths weak, number resonances is small. It possible deal with individual using conventional methods such as...
Accurate spin tracking is a valuable tool for understanding dynamics in particle accelerators and can help improve the performance of an accelerator. In this paper, we present detailed discussion integrators code gpuSpinTrack. We have implemented orbital based on drift-kick, bend-kick, matrix-kick splits. On top integrators, various motion. These use quaternions Romberg quadratures to accelerate both computation convergence rotations. evaluate their accuracy quantitative detail individual...
Solutions to the Thomas-Bargmann-Michel-Telegdi spin equation for $1/2$ particles have date been confined single-resonance crossing. However, in reality, most cases of interest concern overlapping several resonances. While there serious studies this problem, a good analytical solution or even an approximation has eluded community. We show that system can be transformed into Hill-like equation. In representation, we that, while crossing represents parabolic cylinder equation, case becomes...
Laser plasma based accelerators have the potential to reduce dramatically size and cost of future particle colliders light sources. Production high quality beams along with reproducibility, tunability, efficiency are required for many applications. We present design principles two-pulse colliding laser pulse injection mechanisms, which can meet these requirements. Simulations used determine best conditions production beams: charge, low energy spread, emittance. also allow access internal...
The transverse turn-by-turn evolution of a bunch slice after an impulse kick is examined considering chromatic and impedance effects. It found that by fitting the envelope beam motion to simulated data strength resistive wall wakefield can be determined.
Depolarization response for a system of two orthogonal snakes at irrational tunes is studied in depth using lattice independent spin integration. In particular we consider the effect overlapping resonances this system, to understand impact phase, tune, relative location and threshold strengths resonances. These results are benchmarked compared dimensional direct tracking RHIC e-lens standard lattice. Finally longitudinal motion via chromatic scans six tracking.
Field Programmable Gate Arrays (FPGAs) offer a powerful alternative to Application Specific Integrated Circuits (ASIC) or general purpose processors in accelerator control applications. Software development for these devices can be awkward and time consuming, however, when using low level hardware design languages. To facilitate the use of FPGAs systems we are developing library software tools based on ImpulseC, high subset C language specifically designed FPGA programming. Development...
The use of an intense ultrashort laser pulse to induce electron polarization has been proposed in existing literature. Python programming language is used recreate the local constant crossed-field approximation (LCFA) with aim determining values for transverse given a nonzero initial polarization. It shown that over multiple shots, lower quantum efficiency parameter are associated higher output, yet require greater number shots attain maximal Moreover, redefined as function intensity...
Imperfection and vertical intrinsic depolarizing resonances have been overcome by the two partial Siberian snakes in Alternative Gradient Synchrotron(AGS). The relatively weak but numerous horizontal are main source of polarization loss AGS. A pair quads used to these resonances. This technique needs very accurate jump timing. keys for system control quad timing elimination any emittance growth. Fast rollover magnet cycle has it improves tune setup. Recent experimental results including...
We extended the ability of DEPOL to calculate coupled spin resonances and used it determine location strength both intrinsic in RHIC. In particular we are interested full resonance structure with solenoidal elements turned on quadrupole rolls.
The use of colliding laser pulses to control the injection plasma electrons into wake a laser‐plasma accelerator is promising approach obtaining GeV scale electron bunches with reduced emittance and energy spread. Colliding Pulse Injection (CPI) experiments are being performed by groups around world. We present recent particle‐in‐cell simulations, using parallel VORPAL framework, CPI for physical parameters relevant ongoing LOASIS program at LBNL. perform parameter scans in order optimize...