A5107840065- Magnetic confinement fusion research
- Advanced Materials Characterization Techniques
- Solar and Space Plasma Dynamics
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Experimental and Theoretical Physics Studies
- Advanced Chemical Physics Studies
- Geomagnetism and Paleomagnetism Studies
- Nuclear Materials and Properties
- Characterization and Applications of Magnetic Nanoparticles
- Particle accelerators and beam dynamics
- Inorganic Chemistry and Materials
- Astrophysics and Cosmic Phenomena
- Radioactive element chemistry and processing
- Intermetallics and Advanced Alloy Properties
- Quantum, superfluid, helium dynamics
- Semiconductor materials and devices
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Cosmology and Gravitation Theories
- Surface and Thin Film Phenomena
- Rare-earth and actinide compounds
- Radioactive Decay and Measurement Techniques
Colorado School of Mines
2025
Intermountain Healthcare
2024
US Forest Service
2023
United States Geological Survey
2023
Culham Science Centre
2003-2015
University of Oxford
2015
University of Kansas
2012
Culham Centre for Fusion Energy
2003
University of Salford
1994
The University of Texas at Austin
1990
Precision methods for measuring the number of caesium atoms adsorbed on tungsten are described. With these determining $\ensuremath{\theta}$ (the fraction surface covered with Cs), rates atom, ion and electron emission measured as functions $T$, filament temperature. The rate atom evaporation, ${\ensuremath{\nu}}_{a}$, increases rapidly $T$. At low temperatures high pressures Cs vapor concentration approaches a limit 3.563\ifmmode\times\else\texttimes\fi{}${10}^{14}$...
A perturbation theory analogous to that of quasi-linear is developed treat the behavior magnetic surfaces, in particular estimate their stability against field irregularities. The method exploits similarity between Vlasov equation and Liouville for lines. We find a very important role played by resonances, isolated resonances have limited effect, extended over finite width which we estimate, but as soon overlap, rapid destruction flux surfaces may be expected.
The positive ion currents from pure tungsten filaments in saturated caesium vapor at bulb temperatures -35\ifmmode^\circ\else\textdegree\fi{}C to +73\ifmmode^\circ\else\textdegree\fi{}C were measured for filament 1000\ifmmode^\circ\else\textdegree\fi{} 1800\ifmmode^\circ\else\textdegree\fi{}K. results corrected the cooling effect of leads and photoelectric emission film on platinum deposited which was used as an collector. pressures mm Hg are given solid Cs...
The magnetic moment of the hydrogen atom has been investigated by atomic ray method introduced Stern and Gerlach. Atomic formed in a discharge tube R. W. Wood was first used. special all-glass slit system three slits sealed to tube. detected reduction resulting on contact with target coated molybdenum trioxide. A sharply defined blue line against white background result. In field separated into two branching rays. There also evidence central underviated which is believed be due active...
Despite their high relative abundance in our Universe, neutrinos are the least understood fundamental particles of nature. They also provide a unique system to study quantum coherence and wavelike nature systems due extremely weak interaction probabilities. In fact, properties emitted experimentally relevant sources virtually unknown spatial extent neutrino wavepacket is only loosely constrained by reactor oscillation data with spread 13 orders magnitude. Here, we present first direct limits...
Beams of lithium, potassium, and caesium were reflected from crystals sodium chloride lithium fluoride, as a means studying the wave nature these atoms. Incident angles 2\ifmmode^\circ\else\textdegree\fi{} to 60\ifmmode^\circ\else\textdegree\fi{} investigated. Although one one-hundredth percent specular reflection could have been detected, no trace such or diffraction was found. The measured angular distribution atoms followed closely cosine law. Apparatus, detecting device depending on...
The RICE experiment seeks observation of ultra-high energy (UHE; >100 PeV) neutrinos interacting in Antarctic ice, by measurement the radiowavelength Cherenkov radiation resulting from collision a neutrino with an ice molecule. was initiated 1999 as first-generation prototype for eventual, large-scale in-ice UHE detector. Herein, we present updated limits on diffuse flux, based twelve years data taken between and 2010. We find no convincing candidates, 95% confidence-level model-dependent...
The Beryllium Electron capture in Superconducting Tunnel junctions (BeEST) experiment searches for evidence of heavy neutrino mass eigenstates the nuclear electron decay $^7$Be by precisely measuring recoil energy $^7$Li daughter. In Phase-III, BeEST has been scaled from a single superconducting tunnel junction (STJ) sensor to 36-pixel array increase sensitivity and mitigate gamma-induced backgrounds. Phase-III also uses new continuous data acquisition system that greatly increases...
Henry's profile for shaped pole caps has been adapted to a 4-in. magnet. The fields obtained at cap separation of 2.6 cm have examined in some detail. A region constant ∂B2/∂x is which 1 length low and 1.4 high fields. For excitation currents 40×103 amp turns the value B∂B/∂x about 24×106 gauss2/cm.
The theory and the equations governing temperature distribution, resistance, heat flow in a tungsten filament as affected by its leads are given for low range (600\ifmmode^\circ\else\textdegree\fi{}K), both general case several special cases. A vs. current scale is calculated from these using measurements of conductivity this paper previously obtained data on radiating properties resistance tungsten. It form tables formulas which, knowing current, dimensions, lead bulb temperatures one can...
The work of Stern and Gerlach in which they determined the magnetic moments certain atoms at same time furnished direct evidence theory space quantization, by deflection rays an inhomogeneous field, has been repeated for silver atoms. A simplified apparatus is described, using a plated tungsten coil as source atoms, rather than furnace used Gerlach, gives trouble outgassing.The moment sodium potassium. was further modified use with alkali metals construction liquid air cooled target...
In the presence of an electrostatic wave quantity μ0 = v⊥2/B is no longer approximate invariant, contrary to conclusion earlier authors. The real invariant calculated and anomaly in minimum-B stability theory thereby removed.
X-ray powder diffraction data are reported for the phases Eu5Sb3, Eu11Sb10, Eu2Sb3, Eu5Bi3, Eu4Bi3 and Eu11Bi10.
The radiation of energy from a thoriated tungsten filament and the absorption radiated surrounding bulb have been measured by method which eliminates difficulties arising cooling effects leads. For at uniform temperature TF in TB net W watts cm−2 is difference between outgoing WR absorbed WA. values 225° to 580°K 77° 473°K logWR=83.7105−100+5.332logTF,logWA=83.7105−100+4.462logTB+0.87logTF.The resistivity R0 this same range given logR0=91.7123−100+1.23logTF.The characteristics, current,...
Ripples in the confining field may exert a torque on rotating plasma. Time reversal symmetry implies that this should vanish for an ideal However, even apparently plasma, singularities can give rise to nonzero torque. This is evaluated simple configuration. Although primary force magnetic, essential contribution arises from other nonlinear terms equations of motion. The net confined singular layer, direction ripple wave vector and related energy absorbed layer.
These notes are based on lectures given by one of us (J.B.T.) at the University Texas in Austin 1991. Part I concerns some basic features plasma confinement magnetic fields as an introduction to account relaxation II. III discusses mirrors, especially minimum- $B$ systems. It also includes a general discussion adiabatic invariants and principle maximal ordering perturbation theory. IV is devoted analysis perturbations toroidal plasmas stability ballooning modes.