A5049535477- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- Metal and Thin Film Mechanics
- Ion-surface interactions and analysis
- Vacuum and Plasma Arcs
- Atomic and Molecular Physics
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Diamond and Carbon-based Materials Research
- Laser-induced spectroscopy and plasma
- Mass Spectrometry Techniques and Applications
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Semiconductor materials and devices
- Integrated Circuits and Semiconductor Failure Analysis
- Electrostatic Discharge in Electronics
- Laser-Plasma Interactions and Diagnostics
- Muon and positron interactions and applications
- Plasma Applications and Diagnostics
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Advancements in Photolithography Techniques
Brookhaven National Laboratory
2010-2023
Moscow Engineering Physics Institute
2008-2011
Institute for Theoretical and Experimental Physics
2008-2011
Institute of High Current Electronics
2008-2011
State Research Institute for Chemistry and Technology of Organoelement Compounds
2008
"VNIINM" named after AA Bochvar
2008
National Library of Luxembourg
2007
Stony Brook University
2007
RIKEN BNL Research Center
2001-2006
Acceleron Pharma (United States)
2005
Atmospheric pressure plasmas can be used to provide a vacuum-atmosphere interface as an alternative differential pumping. Vacuum-atmosphere utilizing cascade arc discharge was successfully demonstrated and 175 keV electron beam propagated from vacuum through such plasma out into atmospheric pressure. Included in the article are theoretical framework, experimental results, possible applications for this novel interface.
The RIKEN accelerator complex started feeding the next-generation exotic beam facility radioisotope factory (RIBF) with heavy-ion beams from 2007 after successful commissioning of RIBF at end 2006. Many improvements made to 2010 were instrumental in increasing intensity various beams. However, available very heavy ion beams, especially uranium is far below our goal $1\text{ }\text{ }\mathrm{p}\ensuremath{\mu}\mathrm{A}$ ($6\ifmmode\times\else\texttimes\fi{}{10}^{12}\text{...
Many industrial and scientific processes like ion material modification, electron beam melting, welding, as well generation of synchrotron radiation are performed exclusively in vacuum nowadays, since guns, their extractors, accelerators must be kept at a reasonably high vacuum. Consequently, there numerous limitations, among which low production rates due to required pumping time, limits on the size target objects, degradation particle beams through foils or differentially pumped sections....
Major limitations of plasma cathodes have been overcome in an electron gun based on extraction superthermal electrons from a discharge characterized by large component high energy with low thermal spread. A grid is employed to select these for while retaining the bulk discharge. Steady state beams corresponding over 60% total arc current has observed. This extracted far exceeds flux. perveance 280 microperv was reached 9 at 1 keV 6 mm aperture.
We report demonstrations of ion charge-state enhancement for an electron-beam metal-vapor vacuum-arc (E-MEVVA) source. Results with a lead cathode yielded maximum charge state Pb7+, which implies ionization potential at least 130 eV. Electron current densities j=70 A/cm2 and times τ≅100 μs produced jτ=9.2×10−3 C/cm2 (5.8×1016 electrons/cm2). Standard analysis these conditions indicates—somewhat surprisingly—that successive single (stepwise) accounts the present observations, even though...
The negative hydrogen ion formation process on a cesiated W(110) surface is studied by scattering proton beam from such surface. primary energy ranges 50 to 3000 eV. angle of incidence with respect the normal 45° or 70°. A maximum negative-ion probability 0.67 measured. This quantity does not depend incidence. However, it strongly influenced time has been exposed beam. effect attributed implantation.
An ion source based on a planar magnetron sputtering device with thermally isolated target has been designed and demonstrated. For boron target, high temperature is required because low electrical conductivity at room temperature, increasing temperature. The well-insulated can be heated by an initial low-current, high-voltage discharge mode. A power of 16 W was adequate to attain the surface (400 degrees C), followed transition high-current, low-voltage mode for which enters self-sputtering...
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...
We report detailed investigations of the electron-beam metal vapor vacuum arc (E-MEVVA) ion source. The experiments were performed in Moscow and Tomsk with nearly same design sources. recently reported first conclusive demonstration enhancement MEVVA performance using lead bismuth cathodes, which yielded maximum charge states Pb7+ Bi8+ for E-MEVVA, as compared to Pb2+ Bi2+ conventional operation. In this article we extensive results additional cathode materials, further details sources, a...
Experiments have been performed on a hollow cathode discharge to test the feasibility of an efficient H— production. When negatively biased converter electrode was placed in plasma column discharge, current density up 2.7 A/cm2 recorded. Strong evidence found for surface production with lower limit about 0.3 at converter.
To satisfy the requirements of a negative-ion-based neutral beam line for future fusion applications, an H− ion source was developed using surface production negative ions and steady-state plasma injection from hollow cathode discharges. Steady-state stable generation on negatively biased, cesiated converter has been achieved over periods several hours; current pulses 0.3-A amplitude with 1-s duration have extracted same period, but operation extractor not yet due to lack cooling. The meets...
The plasma window is a novel apparatus that utilizes stabilized arc as interface between vacuum and atmosphere or pressurized targets without solid material. Additionally, the has lensing effect on charged particles. This feature enables beam focusing to very small spot sizes overcoming dispersion due scattering by atmospheric atoms molecules. Recently, was mated conventional electron welder. And, welding in accomplished with beams of unprecedented low power energy. Weld quality for...
A retarding potential technique has been employed to select electrons for extraction from a hollow cathode discharge. In ‘‘normal’’ operating pressures, the electron distribution function is Gaussian like with superthermal tail. At low an additional distinct component of very thermal spread 0.13 eV and energy corresponding potential.
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...
An arc discharge with channel diameters of 3 mm and 6 lengths between 30 60 was experimentally investigated for its potential to function as plasma window, i.e., interface vacuum regions different pressures. Electron temperature the measured spectroscopically varied in range 7000 K 15 000 K, increasing current while decreasing gas flow rate. That window had a slightly positive I-V characteristics over whole A–70 A. Measurements pressure separation capability, which were determined by input...
A cold atomic hydrogen beam source has been built and tested at BNL. The flow channel of the source, consisting a discharge tube, constricting nozzle, thermal transition section, an accommodator, was designed to operate in laminar range. novel feature this is 0.3-mm gap between Teflon tube which guides accommodator cools flowing gas; across wall temperature may step from 100 K 3 accommodator. record pulsed H° flux 9.4×1018 sr−1 s−1 obtained 5.8 K. gas dynamic analysis system excellent...
The problem of suppression a plasma instability by the introduction an externally controlled spectrum turbulent electric fields is considered. theory strong turbulence extended to include external fields, and applied half-cyclotron frequency occurring in counterstreaming, magnetically confined electron beams. Experimental results from such beam system are presented which confirm that due resonance broadening.