A5101753304- Plasma Diagnostics and Applications
- Metal and Thin Film Mechanics
- Vacuum and Plasma Arcs
- Semiconductor materials and devices
- Diamond and Carbon-based Materials Research
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Neuroscience and Neural Engineering
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Electrostatic Discharge in Electronics
- Integrated Circuits and Semiconductor Failure Analysis
- Particle Accelerators and Free-Electron Lasers
- Advanced Sensor Technologies Research
- Advanced Memory and Neural Computing
- Ion-surface interactions and analysis
- Advanced Surface Polishing Techniques
- Perovskite Materials and Applications
- Optical properties and cooling technologies in crystalline materials
- Copper Interconnects and Reliability
- Electronic and Structural Properties of Oxides
- Laser Design and Applications
- Advanced Data Storage Technologies
- Scientific Measurement and Uncertainty Evaluation
- Electromagnetic Launch and Propulsion Technology
University of Utah
2024-2025
Lawrence Berkeley National Laboratory
1993-2007
Lawrence Livermore National Laboratory
2003
University of California, Berkeley
1976-2002
Northwestern Polytechnical University
1999
Nissan (United Kingdom)
1999
Fusion Academy
1995
Fusion (United States)
1995
Enhanced confinement of thermally ionized potassium plasma with increasing number magnetic mirrors has been observed in a steady-state single-ended $Q$ machine. The improved occurs an intermediate mean-free-path regime, and is good agreement theory.
The cathodic vacuum are is a simple means of creating highly ionized metal or carbon plasma, which can be used to produce wide variety and compound thin films. In order smooth, defect-free films suitable for optical electronic applications, the plasma needs filtered micrometer-sized molten solid cathode debris known as macroparticles. To date, most research effort on filtering has been focused development optimization magnetic filter designs based curved solenoids. Ryabchikov et al. (1998)...
We describe a quantitative method of measuring film thickness profiles as deposited by plasma beams. Film are usually closely related to the density profile depositing beam. The technique relies on deposition semiopaque over large area transparent medium in situ and thus is particularly suitable for systems used thin deposition. A simple fast quantifying optical versus position using scanner image processing software described. ability quantify relative between different makes this powerful...
The plasma-generating parts of ion sources including their power supplies are usually floated to high potential (ion extraction voltage), thus requiring great insulation efforts and causing costs for high-energy beams. A new concept pulsed is presented in which a single supply used simultaneously produce the plasma extractor voltage via modified Marx generator. Proof-of-principle experiments have been performed with high-current spark discharges vacuum where multiply charged ions produced...
Metallic films that are sufficiently thin compared to the wavelength of light can be optically transparent, and if film is continuous without too many disconnected regions (islands), then electrical resistivity remain usefully low as well. That is, surface both electrically conducting transparent formed on nanoscale over macroscopic distances. We have used a filtered vacuum arc plasma deposition technique form high quality platinum thickness order several hundred angstroms, glass substrates,...
The stabilization of a hot-electron plasma in simple mirror geometry is investigated. Controlled quantities neutral gas generate cold through ionization. Increasing stability found with increasing pressure. pressure required for to be inversely proportional the ionization cross section type gas, indicating that number electrons key stabilizing quantity. requires electron density at least same order magnitude as hot density. Line tying external surfaces does not play role stabilization. A...
An important technique used for the suppression of surface flashover on high voltage DC ceramic insulators as well RF windows is that providing some conduction to bleed off accumulated charge. We have metal ion implantation modify vacuum provide a uniform resistivity approximately 5/spl times/10/sup 10/ /spl Omega//square. A arc source based implanter was implant Pt at an energy about 135 keV doses up more than 16/ ions/cm/sup 2/ into small test coupons and also inside several accelerator...
Summary form only given. To learn about how large systems of neurons communicate, we need to develop, among other things, methods for growing patterned networks numbers neurons. Success with this challenge will be important our understanding the brain works as well novel kinds computer architecture. Large in vitro could show, example, emergence stable patterns activity and lead an groups after repeated stimulation. We have investigated use ion implantation plasma deposition on substrate...
We present time-resolved Kerr rotation (TRKR) spectra in thin films of CH3NH3PbI3 (MAPI) hybrid perovskite using a unique picosecond microscopy technique at 4 K having spatial resolution 2 μm and temporal 1 ps, subjected to both an in-plane applied magnetic field up 700 mT electric 104 V/cm. demonstrate that the obtained TRKR dynamics are substantially inhomogeneous across MAPI with prominent resonances exciton energy interband transition this compound. From quantum beating response as...
Vacuum arc ion sources provide a convenient tool for the production of intense beams metal ions. The are relatively easy to construct and they can produce from all solid metals as well compounds, alloys, mixtures. We have made number different kinds such over course our development work at LBL in past decade, very small ‘‘thumb-size’’ versions large one with 50 cm diameter extractor. Beam current ranges few milliamperes up almost 10 A extraction voltage about 1 100 kV. Multicathode been so...
Tormac (Toroidal Magnetic Cusp) is a plasma confinement concept combining the favorable magnetohydrodynamic stability properties of cusp geometry with good particle inherent to closed field geometry. A conceptual has two regions; an interior region in which toroidal bias or stuffing embedded, and exterior surface confined by mirror trapping along open lines. The combination these regions expected lead configuration having substantially superior that mirror, allow be stable high β. V...
The relationship between the transported ion current and cathodic arc is determined in a vacuum plasma source equipped with curved magnetic filter. Our results suggest that outer inner walls of duct interact independently. field critical factor output. transport efficiency to maximize at value bias plate voltage range +10 V +20 independent (within our limit measurement) strength duct. flux composed two components: diffusion transverse direction due particle collisions drift inertia. wall...
Optical radiation in breakdown of the acceleration gap a forevacuum pressure, wide-aperture, plasma-cathode, pulsed electron sourceWe have investigated spectrum optical during source based on vacuum arc discharge pressure range (3-20 Pa).The analysis shows that considerably increases spectral line intensity and results additional gas metal lines.The is dominated by atomic molecular lines from working gas.The presence under conditions suggests cathode spots arise at emission electrode, assisting gap.
Summary form only given, as follows. There is a need for an alternative to traditional vacuum ion optic systems the case of high-current beams, particularly moderate energy (10-100 keV) heavy beam manipulation, when space charge forces are large. The axially-symmetric electrostatic plasma lens provides attractive and unique alternative. Use in this way was successful demonstrated by series experiments. Here we briefly review fundamentals, peculiarities focusing summarize some recent...