A5058969374- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Crystallography and Radiation Phenomena
- Wnt/β-catenin signaling in development and cancer
- Cancer-related gene regulation
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Muon and positron interactions and applications
- Radiation Therapy and Dosimetry
- Classical Antiquity Studies
- Nuclear Materials and Properties
- Laser-Plasma Interactions and Diagnostics
- Advanced Data Storage Technologies
General Atomics (United States)
2015-2024
Carnegie Mellon University
1970-2024
Weill Cornell Medicine
2023
Cornell University
2023
Tri-Institutional PhD Program in Chemical Biology
2023
Sandia National Laboratories California
2018
University of California, San Diego
2018
Oak Ridge Associated Universities
2018
Oak Ridge National Laboratory
2018
Knoxville College
2018
A new small angle slot (SAS) divertor concept has been developed to enhance neutral cooling across the target by coupling a closed structure with appropriate shaping. Initial tests on DIII-D find strong interplay between such anticipated 'SAS' effects and cross-field drifts, favouring operation ion B × ∇B drift away from X-point, as currently employed for advanced tokamaks. This offers following key improvements relative DIII-D's open lower or partially-closed upper divertor: (i) SAS allows...
The production of the Jψ resonance in 125-GeV/c p¯ and φ− interactions with Be, Cu, W targets has been measured. cross section per nucleon for is suppressed relative to lighter targets, especially at large values Feynman x, which opposite expectation from various explanations European Muon Collaboration effect. Models incorporating modifications gluon structure functions heavy show qualitative agreement data.Received 14 December 1987DOI:https://doi.org/10.1103/PhysRevLett.60.2121©1988...
The production of the χ1 and χ2 states charmonium has been observed in 300 GeV/c π±N pN interactions. fraction total inclusive J/ψ due to radiative χ decay determined be 0.40±0.04, 0.37±0.03, 0.30±0.04 for π+, π−, proton data, respectively. Total cross sections have obtained 131±18±14 188±30±21 nb/nucleon π−N interactions production. By measuring contributions both ψ’ decay, direct 97±14, 102±14, 89±12 protons, respectively.Received 21 October...
The rare $K_{e4}^{}{}_{}{}^{+}$ decay modes ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{e}^{+}\ensuremath{\nu}$, ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{e}^{\ensuremath{-}}\overline{\ensuremath{\nu}}$, and ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}\overline{\ensuremath{\nu}}$ were searched for in a sample of approximately 3\ifmmode\times\else\texttimes\fi{}${10}^{6}$ ${K}^{+}$ decays. A total 69 events the mode...
Luminosity-driven channeling extraction has been observed for the first time in a 900 GeV study at Fermilab Tevatron. This experiment, E853, demonstrated that useful TeV level beams can be extracted from superconducting accelerator during high luminosity collider operations without unduly affecting background detectors. Multi-turn was found to increase significantly efficiency of process. The beam about 25%. Studies dependent effects turn-to-turn structure governed mainly by dynamics. An...
Abstract A set of experiments are planned to exploit the high SOL collisionality enabled by a tightly baffled slot divertor geometry suppress tungsten leakage in DIII-D. toroidal row graphite tiles from Small Angle Slot (SAS) is being coated with 10–15 μ m tungsten. New spectroscopic viewing chords in-vacuo optics will measure W gross erosion source surface spatial and temporal resolution. In parallel, bottom SAS changed flat ‘V’ shape. SOLPS-ITER/DIVIMP simulations conducted drifts using...
Hadroproduction of the $\frac{J}{\ensuremath{\psi}}$ and ${\ensuremath{\psi}}^{\ensuremath{'}}$ states has been studied in 300-GeV/c proton, antiproton, ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$Li interactions. Both total differential cross sections ${x}_{F}$ ${p}_{T}$ have measured for ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, antiproton The ratio to production determined four types beam particles.
We have studied muon pairs with an invariant mass between 4 and 9 GeV/c2 produced in p¯N π−N interactions at incident momentum of 125 GeV/c. The experiment was performed Fermilab using a tungsten target special beam enriched to contain 18% antiprotons. compare differential distributions as functions the dimuon mass, Feynman x, transverse momentum, decay angles predictions Drell-Yan model including QCD corrections. Quark structure for p¯ π− are extracted. Comparisons antiproton data...
We have measured the inclusive cross section for reactions $p+n\ensuremath{\rightarrow}p+X$ and ${\ensuremath{\pi}}^{+}+n\ensuremath{\rightarrow}p+X$ at 100 GeV/c in kinematic region $|t|<1.0$ ${\mathrm{GeV}}^{2}$. The data were obtained from an exposure of Fermilab 30-in. deuterium-filled bubble chamber to a tagged positively charged beam. differential sections these are observed scale ratio $\mathrm{pn}$ ${\ensuremath{\pi}}^{+}n$ total be consistent with predictions Reggeized...
We present the xF and pT differential cross sections of J/ψ ψ′, respectively, in ranges −0.05<xF<0.25 pT<3.5GeV/c. The data samples are constituted by about 12 000 200 ψ′ produced proton-silicon interactions at 800 GeV/c decaying into opposite sign muons. distributions compared with recent results from experiments E789 same energy to leading order QCD predictions using MRS D0 parametrization for parton structure function. measured shapes sections, except dσ/dxF small xF, agree very well...
A search has been made in 300 GeV/c π±- and proton-Li interactions for production of states that decay into J/ψ or ψ' plus one two pions. 2.5σ enhancement the π0 spectrum, possibly recently reported 1P1 state charmonium, is observed at a mass 3.527 GeV/c2. In pion we report, together with expected ψ'→J/ψ π+π−, tentative observation structure 3.836 No enhancements are seen π±π±, π±π0, π±, π± spectra.Received 9 February 1994DOI:https://doi.org/10.1103/PhysRevD.50.4258©1994 American Physical Society
Future tokamak devices are envisioned to utilize a high-Z metal divertor with tungsten as the leading candidate. However, experiments divertors have seen significant detrimental effects on plasma performance. The DIII-D presently has carbon facing surface but study effect of and its migration around vessel, two toroidal rows tiles in region were modified inserts, composed molybdenum alloy (TZM) coated tungsten. A dedicated week experimental campaign was run inserts. One row containing...
The differential and total cross sections for the reactions $\overline{p}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ $\overline{p}p\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ have been measured at six laboratory momenta, ranging from 1.62 to 2.20 GeV/c. ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ section falls (137\ifmmode\pm\else\textpm\fi{}16) (32\ifmmode\pm\else\textpm\fi{}8) \ensuremath{\mu}b over this interval while...
The cross section for bb¯ production in 800GeV/c pN interactions has been measured Fermilab experiment E771 to be 43−17+27(stat)−7+7(syst)nb per nucleon from the observation of events which both b and b¯ decay semimuonically or a B decays into J/ψ followed by J/ψ→μ+μ−.Received 7 July 1997DOI:https://doi.org/10.1103/PhysRevLett.82.41©1999 American Physical Society
Charged-particle multiplicity distributions in 400-GeV/c $\mathrm{pd}$ interactions have been studied an experiment the Fermilab 30-inch bubble chamber. From fractions of odd-prong and backward-proton events, a rescatter fraction 0.22\ifmmode\pm\else\textpm\fi{}0.01 is found (for $N\ensuremath{\ge}3$). The $\mathrm{pn}$ distribution obtained from plus no-cascade assumption. After making one-prong two-prong estimates, mean charged-particle multiplicities 9.49\ifmmode\pm\else\textpm\fi{}0.12...
Luminosity-driven channeling extraction has been observed for the first time using a 900 GeV circulating proton beam at superconducting Fermilab Tevatron. The efficiency was found to be about 30%. A 150 kHz obtained during luminosity-driven with tolerable background rate collider experiments. when limits were doubled. This is highest energy which observed.Received 2 September 1997DOI:https://doi.org/10.1103/PhysRevSTAB.1.022801This article available under terms of Creative Commons...
A novel type of surface eroding thermocouple (SETC) has been tested and demonstrated in the small angle slot (SAS) divertor DIII-D for fast local heat flux measurements. The thermojunction SETC is formed between two thin (10 μm) ribbons, which are filed over to create microfiber junctions. These thermocouples able be exposed directly plasma at temperatures exceeding 2000 °C capable sub-10 ms time resolution. Before installation SAS, SETCs were lower during L-mode H-mode discharges, from...
In an experiment in the Fermilab 30-inch deuterium bubble chamber, we have determined $\mathrm{pd}$ and ${\ensuremath{\pi}}^{+}d$ charged-particle multiplicity distributions. We use corrected odd-prong distributions plus a no-cascade model to extract $\mathrm{pn}$ ${\ensuremath{\pi}}^{+}n$ distributions, indicate how cascade could alter examine relations between $\mathrm{pp}$, ${\ensuremath{\pi}}^{\ensuremath{-}}p$, For each pair, relation is found involving quantities that give probability,...