A5090169273- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Electron and X-Ray Spectroscopy Techniques
- Photocathodes and Microchannel Plates
- Advancements in Photolithography Techniques
- Muon and positron interactions and applications
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Magnetic confinement fusion research
- Gyrotron and Vacuum Electronics Research
- Advanced NMR Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Silicon Carbide Semiconductor Technologies
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Advanced Data Storage Technologies
- Advanced X-ray Imaging Techniques
- Nuclear physics research studies
- Atomic and Molecular Physics
- Neutrino Physics Research
- Electrostatic Discharge in Electronics
Thomas Jefferson National Accelerator Facility
2015-2024
Oak Ridge Associated Universities
2023-2024
Oak Ridge National Laboratory
2021-2024
Brookhaven National Laboratory
2014-2022
Muons (United States)
2010-2021
Cornell University
2021
Siberian State University of Physical Education and Sport
2019
University of Michigan–Ann Arbor
2002-2017
Deutsches Elektronen-Synchrotron DESY
2014
Old Dominion University
2010
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...
To test the hypothesis that caspase-like proteases exist and are critically involved in implementation of programmed cell death (PCD) plants, a search was undertaken for plant caspases activated during N gene–mediated hypersensitive response (HR; form pathogen-induced PCD plants) tobacco plants infected with Tobacco mosaic virus (TMV). For detection, characterization, partial purification caspase, Agrobacterium tumefaciens VirD2 protein, shown here to be cleaved specifically at two sites...
The genetic algorithm (GA) is a powerful technique that implements the principles nature uses in biological evolution to optimize multidimensional nonlinear problem. GA works especially well for problems with large number of local extrema, where traditional methods (such as conjugate gradient, steepest descent, and others) fail or, at best, underperform. field accelerator physics, among others, abounds which lend themselves optimization via GAs. In this paper, we report on successful...
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.
This review paper describes the energy-upgraded Continuous Electron Beam Accelerator Facility (CEBAF) accelerator. superconducting linac has achieved 12 GeV beam energy by adding 11 new high-performance cryomodules containing 88 cavities that have operated cw at an average accelerating gradient of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>20</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>MV</a:mi><a:mo>/</a:mo><a:mi...
We present a concept for control of the ion polarization, called transparent spin method. The transparency is achieved by designing such synchrotron structure that net rotation angle in one particle turn zero. polarization direction any ions including deuterons can be efficiently controlled using weak quasistatic fields. These fields allow dynamic adjustment during an experiment. main features method are illustrated figure-eight collider. results relevant to electron-ion collider considered...
We present a new design of highly specialized small storage rings for low energy polarized electron beams. The is based on the transparent spin methodology that cancels precession due to magnetic dipole moment at any while allowing induced by fundamental physics interest accumulate. buildup vertical component beam polarization can be measured using standard Mott polarimetry optimal energy. Systematic effects are suppressed counter-rotating bunched beams with various orientations. These used...
Abstract Small perturbative fields in a synchrotron influence both the spin and orbital motion of stored beam. Their effect on beam polarization consists two contributions, direct kick an ring lattice due to orbit perturbation. Spin response function is analytic technique account for contributions. We develop such spin-transparent synchrotrons where design degenerate. Several perspective applications are illustrated or discussed. In particular, we consider questions imperfections dynamics...
Short range correlated nucleon-nucleon ($NN$) pairs are an important part of the nuclear ground state. They typically studied by scattering electron from one nucleon in pair and detecting its spectator partner (``spectator-nucleon tagging''). The Electron Ion Collider (EIC) should be able to detect these nucleons, since they boosted high momentum laboratory frame ion beam. To determine feasibility studies with planned EIC detector configuration, we have simulated quasielastic for two beam...
We consider the capability of flexible spin-transparent polarization control and manipulation in conventional synchrotrons at integer spin resonances by means navigators. The latter are designed as a couple small solenoids separated constant beam bend. formulate requirements to navigator design considering criteria for stability motion presence synchrotron energy oscillations. propose novel spin-flipping system free resonant depolarization based on such navigator. discuss possibilities...
Beam-beam interactions pose substantial challenges in the design and operation of circular colliders, significantly affecting their performance. In particular, weak-strong simulation approach is pivotal for investigating single-particle dynamics during collider phase. This paper evaluates limitations existing models simulations, noting that while they accurately account energy changes due to slingshot effects, fail incorporate longitudinal coordinate (<a:math...
Stored beams of polarized protons, electrons, or deuterons can be spin flipped by sweeping an rf dipole's solenoid's frequency through resonance. Fitting such data to the modified Froissart-Stora equation's resonance strength ${\mathcal{E}}_{\mathrm{FS}}$ gave very large deviations from $^{*}\mathcal{E}_{Bdl}$ obtained each magnet's $\ensuremath{\int}{B}_{rms}dl$. We recently varied sweep range $\ensuremath{\Delta}f$, and momentum spread $\ensuremath{\Delta}p/p$ betatron tune...
We present a review of the possibilities to conduct experiments high efficiency in nuclear and energy physics with spin-polarized beams collider complex, configuration which includes Siberian snakes or figure-8 ring. Special attention is given recently elicited advantageous possibility precision regime spin transparency (ST) when design global tune close zero. In this regime, polarization control realized by use navigators (SN), are compact special insertions magnets dedicated flexibility...
We recently studied spin flipping of a 270 MeV vertically polarized deuteron beam stored in the Indiana University Cyclotron Facility Cooler Ring. adiabatically swept an rf solenoid's frequency through rf-induced resonance and observed its effect on deuterons' vector tensor polarizations. After optimizing crossing rate maximizing voltage, we measured spin-flip efficiency 94.2%+/-0.3%. also found striking behavior spin-1 polarization.
We recently analyzed all available data on spin-flipping stored beams of polarized protons, electrons, and deuterons. Fitting the modified Froissart-Stora equation to measured polarization after crossing an rf-induced spin resonance, we found 10--20-fold deviations from depolarizing resonance strength equations used for many years. The was typically manipulated by linearly sweeping frequency rf dipole or solenoid through resonance; spin-flip efficiencies up $99.9%$ were obtained. Lorentz...
The properties of the neutrino provide a unique window on physics beyond that described by standard model. study subleading effects in oscillations, and race to discover CP-invariance violation lepton sector, has begun with recent discovery ${\ensuremath{\theta}}_{13}>0$. measured value ${\ensuremath{\theta}}_{13}$ is large, emphasizing need for facility at which systematic uncertainties can be reduced percent level. factory, intense beams are produced from decay muons, been shown outperform...
We recently studied the spin-flipping efficiency of an rf-dipole magnet using a 120-MeV horizontally polarized proton beam stored in Indiana University Cyclotron Facility Cooler Ring, which contained nearly full Siberian snake. flipped spin by ramping rf dipole's frequency through rf-induced depolarizing resonance. By adiabatically turning on dipole, we minimized loss. After optimizing ramp parameters, used 100 multiple flips to measure spin-flip 99.63+/-0.05%. This result indicates that...
We recently used a new ferrite rf dipole to study spin flipping of $2.1\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ vertically polarized proton beam stored in the COSY Cooler Synchrotron J\"ulich, Germany. swept dipole's frequency through an rf-induced resonance flip beam's polarization direction. After determining resonance's frequency, we varied range, ramp time, and number flips. At maximum strength optimum range measured spin-flip efficiency $99.92\ifmmode\pm\else\textpm\fi{}0.04%$....
We recently used an rf dipole magnet to study the spin flipping of a 120 MeV horizontally polarized proton beam stored in presence nearly full Siberian snake Indiana University Cyclotron Facility Cooler Ring. flipped by ramping dipole's frequency through rf-induced depolarizing resonance. After optimizing ramp parameters, we multiple flips measure spin-flip efficiency $86.5\ifmmode\pm\else\textpm\fi{}0.5%$. The was apparently limited field strength dipole. This result indicates that should...
We recently used a prototype rf dipole magnet to study the spin flipping of 669 MeV horizontally polarized electron beam stored in presence nearly full Siberian snake new MIT-Bates storage ring. flipped by ramping dipole's frequency through an rf-induced depolarizing resonance. After optimizing ramp parameters, we multiple measure spin-flip efficiency $94.5\ifmmode\pm\else\textpm\fi{}2.5%$. The was apparently limited field strength air-core magnet. This unexpectedly high indicates that very...
We recently studied spin flipping of a $1.94\text{ }\text{ }\mathrm{GeV}/c$ vertically polarized proton beam at COSY in J\"ulich, Germany. swept an rf-dipole's frequency through rf-induced resonance to flip the beam's polarization direction. After determining resonance's frequency, we varied dipole's strength, range, and ramp time. At maximum optimum range time, measured spin-flip efficiency $99.3%\ifmmode\pm\else\textpm\fi{}0.1%$. This result indicates that rf dipole may allow efficient...