D. Gassner
A5042058093- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Electron and X-Ray Spectroscopy Techniques
- Photocathodes and Microchannel Plates
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Plasma Diagnostics and Applications
- Advancements in Photolithography Techniques
- High-Energy Particle Collisions Research
- X-ray Spectroscopy and Fluorescence Analysis
- Gyrotron and Vacuum Electronics Research
- Radiation Therapy and Dosimetry
- Radiation Effects in Electronics
- Laser Design and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Crystallography and Radiation Phenomena
- Nuclear Materials and Properties
- Semiconductor materials and devices
- Silicon and Solar Cell Technologies
- Laser-Plasma Interactions and Diagnostics
- Neutrino Physics Research
Brookhaven National Laboratory
2014-2024
Brookhaven College
2014-2024
Cornell University
2018
RIKEN BNL Research Center
2000-2007
National Library of Luxembourg
2007
Office of Scientific and Technical Information
2004
This report is based on a ten-week program Gluons and the quark sea at high-energies, which took place Institute for Nuclear Theory (INT) in Seattle Fall 2010. The principal aim of was to develop sharpen science case an Electron-Ion Collider (EIC), facility that will be able collide electrons positrons with polarized protons light heavy nuclei high energies, offering unprecedented possibilities in-depth studies quantum chromodynamics (QCD). organized around following four major themes: (i)...
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...
Bent crystal channeling has been observed with protons and fully stripped gold ions in the Relativistic Heavy Ion Collider (RHIC). Prior to 2003, a bent was installed one ring of RHIC as first stage two collimation system. The efficiency approximately $25%$, less than half original predictions. We show that this is due difference between model real Twiss parameters at location our improved understanding beam halo. Collimation using unsuccessful raised background STAR detector by much factor...
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,...
We report initial results of exposing low-Z solid and high-Z liquid targets to 150-ns, 4/spl times/10/sup 12/ proton pulses with spot sizes on the order 1 2 mm. The energy deposition density approached 100 J/g. Diagnostics included fiberoptic strain sensors target high-speed photography targets. This work is part R&D program Neutrino Factory Muon Collider Collaboration.
A half-cell superconducting rf electron gun is designed to provide 0.5 A, 2 MeV beam for the Brookhaven National Laboratory R Energy Recovery Linac. Total power of 1 MW must be delivered meet current and energy specifications, resulting in very strong coupling. Two opposing fundamental couplers (FPCs) are employed minimize transverse kick traversing structure halve through coupler. single-window coaxial coupler has been average coupling requirements. The features a planar beryllia window...
Errors in delivering a uniformly distributed radiation dose to biological and material samples exposed charged particle beams are significant problem for experimenters. In this paper, we discuss data collected on the uniform beam distributions produced NASA's Space Radiation Laboratory (NSRL) at Brookhaven National (BNL), using method that was conceived theoretically tested experimentally BNL. This [N. Tsoupas et al., Nucl. Sci. Eng. 126, 71 (1997)] of generating plane normal beam's...
Two electron lenses ($e$-lenses) have been in operation during the 2015 RHIC physics run as part of a head-on beam-beam compensation scheme. While lattice was chosen to reduce beam-beam-induced resonance-driving terms, reduced tune spread. This has demonstrated for first time. The scheme allows higher parameters and therefore intensities luminosity. In this paper, we detail design considerations verification beam $e$-lenses. Longitudinal transverse alignments with ion beams transfer function...
The Low Energy RHIC electron Cooling (LEReC) project at Brookhaven National Laboratory recently demonstrated for the first time cooling of hadron bunches with radio-frequency (rf) accelerated bunches. LEReC uses a high-voltage photoemission gun stringent requirements beam current, quality, and stability. has photocathode high-power fiber laser, novel cathode production, transport, exchange system. It been that can continually produce high-current quality suitable cooling. We describe...
A high-current high-brightness electron accelerator for low-energy RHIC cooling (LEReC) was successfully commissioned at Brookhaven National Laboratory. The LEReC includes a dc photoemission gun, laser system, photocathode delivery magnets, beam diagnostics, superconducting rf booster cavity, and set of normal conducting cavities to provide enough flexibility tune the in longitudinal phase space. Cooling with nonmagnetized accelerated beams requires corrections obtain small momentum spread...
We report progress on the R&D program for electron-cooling of Relativistic Heavy Ion Collider (RHIC). This electron cooler is designed to cool 100 GeV/nucleon at storage energy using 54 MeV electrons. The source will be a superconducting RF photocathode gun. accelerator recovery linac. frequency set 703.75 MHz. maximum bunch 9.38 MHz, with charge 20 nC. has following components: photoinjector and its photocathode, linac cavity, start-to-end beam dynamics magnetized electrons, cooling...
Next generation light-sources, electron coolers, high-power FELs, Compton X-ray sources and many other accelerators were made possible by the emerging technology of high-power, high-brightness beams. In order to get anticipated performance level ampere-class currents, technological barriers are yet be broken. BNL's Collider-Accelerator Department is pursuing some these technologies for its cooling RHIC application, as well a future electron-hadron collider. We will describe work on CW,...
We present the design and parameters of an energy recovery linac (ERL) facility, which is under construction in Collider-Accelerator Department at BNL. This R&D facility has goal demonstrating CW operation ERL with average beam current range 0.1 - 1 ampere very high efficiency recovery. The possibility a future upgrade to two-pass also being considered. heart 5-cell 703.75 MHz super-conducting RF strong Higher Order Mode (HOM) damping. flexible lattice provides test-bed for exploring issues...
The four electron stripping stages leading to fully stripped gold ions in the Relativistic Heavy Ion Collider (RHIC) are briefly described. third stripper, which removes 46 electrons from ${\mathrm{Au}}^{31+}$ heliumlike ${\mathrm{Au}}^{77+}$, offers greatest challenges terms of energy loss and induced spread. These problems described detail as well recent advances design performance this stripper. Measurements performed with several carbon aluminum strippers show general agreement a...
The Coherent Electron Cooling Proof of Principle (CeC PoP) system is being installed in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. It will demonstrate ability relativistic electrons to cool a single bunch heavy ions RHIC. This technique may increase beam luminosity by as much tenfold. Within scope this experiment, 112 MHz 2 MeV Superconducting Radio Frequency (SRF) electron gun coupled with cathode stalk mechanism, two normal conducting 500 single-cell...
A residual gas fluorescence beam profile monitor at the Relativistic Heavy Ion Collider (RHIC) has successfully recorded images of various species relativistic heavy ions during FY2012 operations. These fully striped include gold, copper, and uranium 100, 99.9, $96.4\text{ }\text{ }\mathrm{GeV}/\mathrm{n}$, respectively. Their profiles give an independent measurement RHIC size emittance. We estimated their corresponding cross sections to be...
The world's first electron cooling based on the rf acceleration of bunches was experimentally demonstrated at Low Energy RHIC Electron Cooler (LEReC) Brookhaven National Laboratory. critical step in obtaining Au ions collider with this new approach matching and ion relativistic $\ensuremath{\gamma}$-factors a relative error less than $5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. Since beam kinetic energy just 1.6 MeV, it required to set absolute electrons an accuracy better...