A5055669238- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Gyrotron and Vacuum Electronics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Electron and X-Ray Spectroscopy Techniques
- Physics of Superconductivity and Magnetism
- Magnetic properties of thin films
- Photocathodes and Microchannel Plates
- Geophysics and Gravity Measurements
- Atomic and Molecular Physics
- Advanced Data Storage Technologies
- Advanced NMR Techniques and Applications
- Plasma Diagnostics and Applications
- Advancements in Photolithography Techniques
- Structural Engineering and Vibration Analysis
- Optical Coherence Tomography Applications
- Advanced X-ray Imaging Techniques
Taiyuan University of Technology
2024-2025
Brookhaven National Laboratory
2015-2024
North China Electric Power University
2024
Shenzhen University
2023
Brookhaven College
2023
Thomas Jefferson National Accelerator Facility
2016-2019
Shanghai Jiao Tong University
2018
University of California, Los Angeles
2003-2013
RIKEN BNL Research Center
1999-2013
Hebei University of Technology
2009-2013
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well those reached directly at high energy colliders. Discrimination between different models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss current status prospects near future a compelling suite such experiments, along with developments needed encompassing theoretical framework.
The analyzing powers of ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ were measured using an incident $22\ensuremath{-}\mathrm{GeV}/c$ transversely polarized proton beam at the Brookhaven Alternating Gradient Synchrotron. A magnetic spectrometer ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ inclusive asymmetries on a hydrogen carbon target. An elastic polarimeter with ${\mathrm{CH}}_{2}$ target pp elastic-scattering to determine polarization published data for...
A 9\ifmmode^\circ\else\textdegree\fi{} solenoidal spin rotator or 5% partial Siberian Snake was used to successfully accelerate polarized protons for the first time 10.8 GeV kinetic energy in Brookhaven Alternating Gradient Synchrotron with depolarization due intrinsic resonance crossing. It found that a snake can effectively overcome 18 imperfection resonances this range. We also observed an interference between flip induced by and linear coupling solenoid field of snake.
Since 2001, the Relativistic Heavy Ion Collider has experienced electron cloud effects, some of which have limited beam intensity. These include dynamic pressure rises (including instabilities), tune shifts, a reduction instability threshold for bunches crossing transition energy, and possibly incoherent emittance growth. We summarize main observations in operation dedicated experiments as well countermeasures including baking, nonevaporable getter coated warm pipes, solenoids, bunch...
A coherent spin resonance excited by an rf dipole was used to overcome depolarization due intrinsic resonances at the Alternating Gradient Synchrotron (AGS) Brookhaven National Laboratory. We found that our data are consistent with a full flip of polarized proton beam, without emittance growth, $G\ensuremath{\gamma}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}12+{\ensuremath{\nu}}_{z}$ and $36\ensuremath{-}{\ensuremath{\nu}}_{z}$, adiabatically exciting vertical betatron oscillation...
Synchrotron motion with rf phase modulation was studied experimentally. Poincaré maps in the resonant precessing frame were obtained from experimental data and compared tori of Hamiltonian. Our revealed island structure longitudinal space. Experimental results for synchrotron excited by at third harmonic frequency are also reported.Received 28 June 1993DOI:https://doi.org/10.1103/PhysRevE.48.4678©1993 American Physical Society
The synchroton motion of a beam was tracked for the first time by digitizing phase signal from high bandwidth wall gap monitor relative to rf and momentum deviation with transverse position measurement in dispersion region. measured synchrotron tune as function amplitude agrees well theory. When stable angle modulated harmonically, response showed characteristics chaos bifurcations parametric resonant system. Manipulating system create islands space may offer applications future hadron...
Sustained coherent betatron oscillations have been produced in the Brookhaven National Laboratory Alternating Gradient Synchrotron (AGS) using a high-frequency oscillating dipole field operating very near subharmonic of tune. The were adiabatically induced and manipulated controlled fashion so that transverse emittance particle beam was preserved. This procedure will be used to induce spin flip AGS during crossing depolarizing resonances polarized operation. It may also find applications...
Synchro-betatron coupling in a proton storage ring with electron cooling was studied experimentally by modulating transverse dipole field close to the synchrotron frequency. The combination of and modulation on oscillation is equivalent dissipative parametric resonant system. bunch observed split longitudinally into two pieces, or beamlets, converging toward attractors These phenomena might be important understanding effect ground vibration Superconducting Super Collider beam, power supply...
Precise measurements of the single spin asymmetry ${A}_{N}$, and double ${A}_{NN}$, in proton-proton ($pp$) elastic scattering region four-momentum transfer squared $0.001<\ensuremath{-}t<0.032\text{ }\text{ }(\mathrm{GeV}/c{)}^{2}$ have been performed using a polarized atomic hydrogen gas jet target Relativistic Heavy Ion Collider (RHIC) proton beam. We present ${A}_{N}$ ${A}_{NN}$ at center-of-mass energies $\sqrt{s}=6.8$ 13.7 GeV. These spin-dependent observables are sensitive to...
The analyzing power for proton-carbon elastic scattering in the Coulomb-nuclear interference region of momentum transfer, 9.0×10−3<−t<4.1×10−2 (GeV/c)2, was measured with a 21.7 GeV/c polarized proton beam at Alternating Gradient Synchrotron Brookhaven National Laboratory. ratio hadronic spin-flip to nonflip amplitude, r5, obtained from be Rer5=0.088±0.058 and Imr5=−0.161±0.226.Received 11 February 2002DOI:https://doi.org/10.1103/PhysRevLett.89.052302©2002 American Physical Society
A new optically pumped polarized H− ion source (OPPIS) was developed for the RHIC polarization program and successfully used first beam commissioning at RHIC. The OPPIS produces in excess of 1.0 mA current about 80% polarization. An ECR primary proton development a 29 GHz microwave power supply are described. type sodium-jet ionizer cell is biased to −32 kV produce 35 keV ready injection RFQ. Higher higher were also obtained with jet-cell comparison an old oven-type cell.
Synchrotron motion with an external rf voltage modulation was studied experimentally. Beam particles, in the presence of electron cooling, were observed to damp basins resonance islands, which produced by parametric due modulation. The measured phase amplitudes centers these islands found agree well theory.
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 Polarized Atomic Hydrogen Gas Jet Target polarimeter is employed by the Relativistic Heavy Ion Collider (RHIC) to measure absolute polarization of each colliding proton beam. Polarimeter detectors and data acquisition were upgraded in 2015 increase solid angle, energy range, resolution. These upgrades advanced systematic error analysis along with improved beam intensity RHIC runs (E_{beam}=100 GeV) 2017 (255 allowed us greatly reduce statistical uncertainties for elastic spin...
Fourier light-field microscopy (FLFM) uses a microlens array (MLA) to segment the plane of microscopic objective lens generate multiple two-dimensional perspective views, thereby reconstructing three-dimensional (3D) structure sample using 3D deconvolution calculation without scanning. However, resolution FLFM is still limited by diffraction, and furthermore, it dependent on aperture division. In order improve its resolution, super-resolution optical fluctuation (SOFFLFM) was proposed here,...