A5055319619- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Nuclear physics research studies
- Photocathodes and Microchannel Plates
- Plasma Diagnostics and Applications
- Quantum, superfluid, helium dynamics
- Dark Matter and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Solar and Space Plasma Dynamics
- Nuclear reactor physics and engineering
- Mass Spectrometry Techniques and Applications
- Gamma-ray bursts and supernovae
- Diamond and Carbon-based Materials Research
- Laser-Plasma Interactions and Diagnostics
Brookhaven National Laboratory
2015-2024
Banaras Hindu University
2018-2023
Abilene Christian University
2023
PHENIX laboratory
2020-2023
Thomas Jefferson National Accelerator Facility
2016-2023
Massachusetts Institute of Technology
2016-2023
Augustana University
2018-2023
Bhabha Atomic Research Centre
2018-2023
Charles University
2020
Université Clermont Auvergne
2019
A new experiment is described to detect a permanent electric dipole moment of the proton with sensitivity $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant are discussed and techniques address them presented. The measurement sensitive physics beyond Standard Model at scale 3000~TeV.
We report the first measurements of A_N absolute value and shape in -t range from 0.0015 to 0.010GeV/c^2 with a precision better than 0.005 for each data point using polarized atomic hydrogen gas jet target 100 GeV RHIC proton beam.
At the Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider (RHIC) Beam‐Beam Counter (BBC) array for Solenodial Tracker at RHIC (STAR) is a very versatile tool polarized proton beam diagnostics. The BBC setup provides an excellent minimum bias trigger; and hits on inner annuli of six hexagonal scintillator tiles coincidence trigger with suitable algorithm has quite large single spin analyzing power ∼8×10−3 100 GeV −100 collisions. STAR effective local polarimeter these...
Two volume sources equipped with DESY and CERN plasma generators a low voltage electron dump were operated at 45 kV in the Linac4 tunnel on dedicated test stand. These delivered approximately 20 mA ensured commissioning of Radio Frequency Quadrupole accelerator first section Drift Tube Linac. CERN's prototype cesiated surface source this was continuously from November 2013 to April 2014 ion stand is being commissioned tunnel. Before cesiation, conditioned mode provided up 30 H− beam. Short...
The parity-violating longitudinal analyzing power, Az, has been measured in pp elastic scattering at an incident proton energy of 221 MeV. result obtained is Az =(0.84 +/- 0.29 (stat.) 0.17 (syst.)) x 10^{-7}. This experiment unique that it selects a single parity violating transition amplitude, 3P2-1D2, and consequently directly constrains the weak meson-nucleon coupling constant h^pp_rho When this taken together with existing violation data, constants h^pp_omega can, for first time, both...
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...
TRIUMF experiment 497 has measured the parity-violating longitudinal analyzing power Az in p→p elastic scattering at 221.3 MeV incident proton energy. This comprehensive paper includes details of corrections, some magnitude comparable to itself, required arrive final result. The largest correction was for effects first moments transverse polarization. addition result, Az=[0.84±0.29(stat.)±0.17(syst.)]×10−7, parity-violation experimental data base greatly improves constraints on weak...
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.
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 addition of a polarized 3 He ion source for use at the Relativistic Heavy Ion Collider (RHIC) Brookhaven National Laboratory would enable host new measurements, particularly in context planned eRHIC. We are developing such using metastability exchange optical pumping to polarize helium-3, which will be then transferred into RHIC’s Electron Beam Source ionization. aim deliver nuclear polarization near 70%, and roughly 10[Formula: see text] doubly-ionized He[Formula: ions created each 20...
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...
Acceleration of polarized protons in the energy range 5 to 25 GeV is challenging. In a medium accelerator, depolarizing spin resonances are strong enough cause significant polarization loss but full Siberian snakes intolerably large orbit excursions and also not feasible since straight sections usually too short. Recently, two helical partial with double pitch design have been installed Brookhaven Alternating Gradient Synchrotron (AGS). With careful setup optics at injection along ramp, this...
A novel polarization technique had been successfully implemented for the Relativistic Heavy Ion Collider (RHIC) polarized H− ion source upgrade to higher intensity and polarization. In this technique, a proton beam inside high magnetic field solenoid is produced by ionization of atomic hydrogen (from external source) in He-gaseous ionizer cell. Further process electron capture from optically pumped Rb vapor. The use high-brightness primary large cross sections charge-exchange resulted...
The polarization measurement through elastic (p⃗,C) reaction plays a crucial role in the polarized proton beam operation of Relativistic Heavy Ion collider at Brookhaven National Laboratory. As well as measuring polarization, unknown analyzing power AN is determined combination with absolute meausement by H‐jet polarimeter. systematic uncertainty Run05 measurements are discussed introducing experimental apparatus polarimeter system.
We describe a proposal to search for an intrinsic electric dipole moment (EDM) of the proton with sensitivity \targetsens, based on vertical rotation polarization stored beam. The New Physics reach is order $10^~3$TeV mass scale. Observation EDM provides best probe CP-violation in Higgs sector, at level that may be inaccessible electron-EDM experiments. improvement $\theta_{QCD}$, parameter crucial axion and dark matter physics, about three orders magnitude.
Review of results development polarized ion sources with nearly resonant charge‐exchange plasma ionizer is presented. Pulsed beams protons peak intensity up to 11 mA and polarization 80% negative hydrogen ions current 4 91% have been obtained. Polarized deuterons, deuterium 3He++ can be produced by this method as well. A study a pulsed atomic beam has performed. It was found that the limited beam‐skimmer interference noncomplete cooling atoms.
Two partial Siberian snakes were used to avoid all the spin imperfection and vertical intrinsic resonances in alternating gradient synchrotron (AGS) at Brookhaven National Laboratory. However, horizontal betatron motion can cause polarization loss resulting from nonvertical stable direction presence of two snakes. This type resonance, called a was observed systematically studied AGS. A simplified analytic model numerical simulation have been developed compare with experimental data....