A5067224934- 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
- Gyrotron and Vacuum Electronics Research
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Distributed and Parallel Computing Systems
- Photocathodes and Microchannel Plates
- Advanced NMR Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Plasma Diagnostics and Applications
- Advanced Data Storage Technologies
- Quantum, superfluid, helium dynamics
- Astrophysics and Cosmic Phenomena
- Physics of Superconductivity and Magnetism
- Radiation Therapy and Dosimetry
- Nuclear reactor physics and engineering
- Neutrino Physics Research
Brookhaven National Laboratory
2015-2024
Texas Christian University
2022-2024
Cornell University
2018-2020
RIKEN BNL Research Center
1999-2016
Thomas Jefferson National Accelerator Facility
2016
Ludwig-Maximilians-Universität München
2008-2010
Massachusetts Institute of Technology
1986-2009
LMU Klinikum
2008
Stony Brook University
1985-2007
National Library of Luxembourg
2007
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
The status of the research on muon colliders is discussed and plans are outlined for future theoretical experimental studies. Besides continued work parameters a 3-4 0.5 TeV center-of-mass (CoM) energy collider, many studies now concentrating machine near 0.1 that could be factory s-channel production Higgs particles. We discuss various components in such colliders, starting from proton accelerator needed to generate pions heavy-Z target proceeding through phase rotation decay ($\pi \to \mu...
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
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.
This document presents BNL's plan for an electron-ion collider, eRHIC, a major new research tool that builds on the existing RHIC facility to advance long-term vision Nuclear Physics discover and understand emergent phenomena of Quantum Chromodynamics (QCD), fundamental theory strong interaction binds atomic nucleus. We describe scientific requirements such facility, following up community-wide 2012 white paper, 'Electron-Ion Collider: Next QCD Frontier', present design concept incorporates...
Abstract Colliders are essential research tools for particle physics. Numerous future collider proposal were discussed in the course of US high energy physics community strategic planning exercise Snowmass'21 . The Implementation Task Force (ITF) has been established to evaluate proposed accelerator projects performance, technology readiness, schedule, cost, and environmental impact. Corresponding metrics developed uniform comparison proposals ranging from Higgs/EW factories multi-TeV...
We studied the G\ensuremath{\gamma}=2 imperfection depolarizing resonance at 108 MeV, both with and without a Siberian snake, by varying strength while storing beams of 104- 120-MeV polarized protons Indiana University Cooler Ring. used cylindrically symmetric polarimeter to simultaneously study effect on vertical radial components polarization. AT 104 MeV we found that snake eliminated nearby resonance.
Energy recovery has been achieved in a multipass linear accelerator, demonstrating technology for more compact particle accelerators operating at higher currents and reduced energy consumption. delivered to the beam during first four passes through accelerating structure was recovered subsequent decelerating passes. High-energy efficiency by use of superconducting cavities permanent magnets. The fixed-field alternating-gradient optical system used return loop successfully transported...
Continuous-wave photoinjectors operating at high accelerating gradients promise to revolutionize many areas of science and applications. They can establish the basis for a new generation monochromatic x-ray free electron lasers, high-brightness hadron beams, or microchip production. In this Letter we report on record-performing superconducting rf gun with ${\mathrm{CsK}}_{2}\mathrm{Sb}$ photocathode. The is generating charge bunches (up $10\text{ }\text{ }\mathrm{nC}/\text{bunch}$) low...
We measured the analyzing power $A$ and spin-spin correlation parameter ${A}_{\mathrm{nn}}$, in large-${P}_{\ensuremath{\perp}}^{2}$ proton-proton elastic scattering, using a polarized-proton target beam at Brookhaven Alternating-Gradient Synchrotron. also used our polarimeter to measure small ${P}_{\ensuremath{\perp}}^{2}$ 13 GeV with good precision found some deviation from expected $\frac{1}{{P}_{\mathrm{lab}}}$ behavior. At 18.5 GeV/c we...
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.
Accelerating polarized protons to 22 GeV/c at the Brookhaven Alternating Gradient Synchro- tron required both extensive hardware modifications and a difficult commissioning process. We had overcome 45 strong depolarizing resonances maintain polarization up in this strong-focusing synchrotron. At 18.5 we measured analyzing power A spin-spin correlation parameter Ann large- P2⊥ proton-proton elastic scattering, using proton beam target. also obtained high-precision measurement of P2⊥=0.3...
Parity nonconservation has been studied in elastic $p\ensuremath{\alpha}$ scattering at 46 MeV with longitudinally polarized protons. The longitudinal analyzing power averaged over the range of laboratory angles roughly 30\ifmmode^\circ\else\textdegree\fi{} to 60\ifmmode^\circ\else\textdegree\fi{} is found be ${A}_{z}=(\ensuremath{-}3.3\ifmmode\pm\else\textpm\fi{}0.9)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$. This result and measurements other light nuclear systems are used...
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...
Cooling of beams gold ions using electron bunches accelerated with radio-frequency systems was recently experimentally demonstrated in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Such an approach is new and opens possibility this technique higher energies than possible electrostatic acceleration beams. The challenges include generation suitable for cooling, delivery required quality to cooling sections without degradation beam angular divergence energy spread,...
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...
We overcame the strong G\ensuremath{\gamma}=-3+${\ensuremath{\nu}}_{\mathit{y}}$ intrinsic depolarizing resonance using a Siberian snake acting on stored beam of 177-MeV polarized protons at Indiana University Cooler Ring. also saw first evidence for synchrotron in proton ring. Two resonances were studied by varying rf accelerating voltage and imperfection field 104 MeV. The these resonances.
We explore the possible use of particle beam storage rings as quantum computers. More precisely, we consider creating an ion trap system, in which same computational basis states can be defined a modern but ions have constant velocity and are rotating circular trap. The basic structures that classical ultracold crystalline beams. What propose is novel method uses computer concept, puts into frame reference. benefits this approach discussed.Received 28 February 2020Accepted 4 May...
▪ Abstract This review discusses the design and initial operation of Relativistic Heavy Ion Collider (RHIC), noting novel features a heavy ion collider that are distinct from conventional hadron colliders. These reflect experimental requirements with variety species over wide energy range, including collisions between ions unequal energies polarized protons. Other unique aspects RHIC include intrabeam scattering, interaction-region error compensation, transition crossing slow ramp rate. The...
We measured simultaneously $\mathrm{pp}$ elastic and quasielastic $(p,2p)$ scattering in hydrogen, deuterium, carbon for momentum transfers of 4.8 to $6.2(\mathrm{GeV}/c{)}^{2}$ at incoming momenta 5.9 $7.5\mathrm{GeV}/c$ center-of-mass angles the range ${\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}83.7\ifmmode^\circ\else\textdegree\fi{}--90\ifmmode^\circ\else\textdegree\fi{}$. The nuclear transparency is defined as ratio cross section free...
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...