D. Trbojevic
A5090912488- 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
- High-Energy Particle Collisions Research
- Radiation Therapy and Dosimetry
- X-ray Spectroscopy and Fluorescence Analysis
- Gyrotron and Vacuum Electronics Research
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Advanced X-ray Imaging Techniques
- Electron and X-Ray Spectroscopy Techniques
- Atomic and Molecular Physics
- Plasma Diagnostics and Applications
- Quantum Chromodynamics and Particle Interactions
- Advanced Data Storage Technologies
- Ion-surface interactions and analysis
- Photocathodes and Microchannel Plates
- Silicon Carbide Semiconductor Technologies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Electromagnetic Simulation and Numerical Methods
Brookhaven National Laboratory
2013-2024
Cornell University
2020-2021
Thomas Jefferson National Accelerator Facility
2021
Brookhaven College
2001-2017
RIKEN BNL Research Center
2002-2007
National Library of Luxembourg
2007
Fermi National Accelerator Laboratory
1985-2003
United States Department of Energy
2002
Georgetown University
1983-1985
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 silicon crystal was used to channel and extract 70 GeV protons from the U-70 accelerator with an efficiency of 85.3+/-2.8%, as measured for a beam approximately 10(12) directed towards crystals 2 mm length in spills s duration. The experimental data follow very well prediction Monte Carlo simulations. This demonstration is important devising more efficient use Protvino provides crucial support implementing crystal-assisted slow extraction collimation other machines, such Tevatron, RHIC,...
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...
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...
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...
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...
Nonscaling fixed field alternating gradient (FFAG) rings for cancer hadron therapy offer reduced physical aperture and large dynamic as compared to scaling FFAGs. The variation of tune with energy implies the crossing resonances during acceleration. Our design avoids intrinsic resonances, although imperfection must be crossed. We consider a system three nonscaling FFAG 250 MeV protons $400\text{ }\mathrm{MeV}/u$ carbon ions. Hadrons are accelerated in common radio frequency quadrupole linear...
Muon Colliders have unique technical and physics advantages disadvantages when compared with both hadron electron machines. They should thus be regarded as complementary. Parameters are given of 4 TeV 0.5 high luminosity \mumu colliders, a lower demonstration machine. We discuss the various systems in such muon starting from proton accelerator needed to generate muons proceeding through cooling, acceleration storage collider ring. Problems detector background also discussed.
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...
Muon Colliders have unique technical and physics advantages disadvantages when compared with both hadron electron machines. They should thus be regarded as complementary. Parameters are given of 4 TeV 0.5 high luminosity \mu^+ \mu^- colliders, a lower demonstration machine. We discuss the various systems in such muon starting from proton accelerator needed to generate muons proceeding through cooling, acceleration storage collider ring. Detector background, polarization, nonstandard...
First, a review is given of fixed field alternating gradient (FFAG) accelerators, presenting bit their history and basic concepts. Special attention paid to the concept scaling (S-FFAG) nonscaling (NS-FFAG) FFAGs. This notation used only in NS-FFAG part article. A discussion then provided on operating presentation made designs being considered for S-FFAGs. more said about resonance crossing problem resulting from NS-FFAGs. beam delivery system (gantry) employing presented after that and,...
We present a design of nonscaling fixed field alternating gradient accelerators (FFAG) minimizing the dispersion action function $H$. The is considered both analytically and via computer modeling. basic principles FFAG lattice discuss optimization strategies so that one can accelerate over broad range momentum with reasonable apertures. Acceleration schemes for muons are discussed.
This design report describes the construction plans for world's first multi-pass SRF ERL. It is a 4-pass recirculating linac that recovers beam's energy by 4 additional, decelerating passes. All beams are returned deceleration in single beam pipe with large-momentum-aperture permanent magnet FFAG optics. Cornell University has been pioneering new class of accelerators, Energy Recovery Linacs (ERLs), characteristic set parameters. Technology prototyped essential any high brightness electron...
Medium-energy accelerators are often confronted with problems during transition energy crossing, such as longitudinal microwave instability and nonlinear synchrotron motion. These can be avoided by an accelerator having a negative momentum-compaction factor. A modular method for designing lattice adjustable factor is presented. The dispersion excursion of the basic flexible momentum compaction module minimized to less than maximum focusing-defocusing (FODO) containing same FODO cells. phase...
N p junction photovoltaic detectors in the p-type single-crystal SnS have been produced by Sb+ ion implantation. Current-voltage and capacitance-voltage characteristics measured at 77 295 K. At K, diodes had zero-bias resistance area products of 1.5×103 W cm2. The spectral response has peak responsivity was a wavelength 0.76 mm. detectivity, which occurred 0.62 mm, 1.3×1011 cm Hz1/2 W−1 with quantum efficiency 44%.
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...
Deuteron and gold beams have been accelerated to a collision energy of /spl radic/s = 200 GeV/u in the Relativistic Heavy Ion Collider (RHIC), providing first asymmetric-species collisions this complex. Necessary changes for mode operation include new ramping software asymmetric crossing angle geometries. This paper reviews machine performance, problems encountered their solutions, accomplishments during 16 weeks ramp-up operations.