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Integrated optical MEMS using through-wafer vias and bump-bonding.

Description: This LDRD began as a three year program to integrate through-wafer vias, micro-mirrors and control electronics with high-voltage capability to yield a 64 by 64 array of individually controllable micro-mirrors on 125 or 250 micron pitch with piston, tip and tilt movement. The effort was a mix of R&D and application. Care was taken to create SUMMiT{trademark} (Sandia's ultraplanar, multilevel MEMS technology) compatible via and mirror processes, and the ultimate goal was to mate this MEMS fab… more
Date: January 1, 2008
Creator: McCormick, Frederick Bossert & Frederick, Scott K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Effects of Mirror Confrontation on Body Image Ratings

Description: There are conflicting data in the literature regarding the effects of mirror exposure on subjective body-image evaluation. Much of the objective self-awareness research by Duval and Wicklund concluded that the presence of a mirror leads people to evaluate themselves negatively, while other studies have reported contrary findings. The primary purpose of this study was to determine the effects of mirror confrontation on individuals' body image ratings. Subjects were 88 childless, female universit… more
Date: August 1995
Creator: Dell'Era, Maria Elena
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Simulation of Alpha-Channeling in Mirror Machines

Description: Applying α-channeling techniques to mirror machines can significantly increase their effective reactivity, thus making open configurations more advantageous for practical fusion. A large fraction of α particle energy can be extracted using rf waves. Effects employed to cool α particles can also in principle be used to heat the fusion ions; the possibility to design a configuration of rf waves which could be used to perform both tasks is demonstrated.
Date: March 17, 2008
Creator: A.I. Zhmoginov, N.J. Fisch
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulation studies of non-neutral plasma equilibria in anelectrostatic trap with magnetic mirror

Description: The equilibrium of an infinitely long, strongly magnetized, non-neutral plasma confined in a Penning-Malmberg trap with an additional mirror coil has been solved analytically [J. Fajans, Phys. Plasmas 10, 1209 (2003)] and shown to exhibit unusual features. Particles not only reflect near the mirror in the low field region, but also may be weakly trapped in part of in the high field region. The plasma satisfies a Boltzmann distribution along field lines; however, the density and the potential va… more
Date: June 1, 2006
Creator: Gomberoff, K.; Fajans, J.; Wurtele, J.; Friedman, A.; Grote, D. P.; Cohen, R. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SYMTRAN - A Time-dependent Symmetric Tandem Mirror Transport Code

Description: A time-dependent version of the steady-state radial transport model in symmetric tandem mirrors in Ref. [1] has been coded up and first tests performed. Our code, named SYMTRAN, is an adaptation of the earlier SPHERE code for spheromaks, now modified for tandem mirror physics. Motivated by Post's new concept of kinetic stabilization of symmetric mirrors, it is an extension of the earlier TAMRAC rate-equation code omitting radial transport [2], which successfully accounted for experimental resul… more
Date: June 15, 2004
Creator: Hua, D. & Fowler, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Waves for Alpha-Channeling in Mirror Machines

Description: Alpha-channeling can, in principle, be implemented in mirror machines via exciting weaklydamped modes in the ion cyclotron frequency range with perpendicular wavelengths smaller than the alpha particle gyroradius. Assuming quasi-longitudinal or quasi-transverse wave propagation, we search systematically for suitable modes in mirror plasmas. Considering two device designs, a proof-of-principle facility and a fusion rector prototype, we in fact identify candidate modes suitable for alpha-channeli… more
Date: July 8, 2009
Creator: Fisch, A. I. Zhmoginov and N. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle Deconfinement in a Bent Magnetic Mirror

Description: Coils misalignment in a magnetic mirror can produce additional particle transport. The magnetic field non axi-symmetry is responsible for radial and longitudinal drifts in a way much similar to the neo-classical transport in a tandem mirror cell distorted by end plugs. Accordingly, a regime exhibiting large radial displacements - similar to the resonant regime in tandem mirrors - can be obtained by confining ions azimuthally, for example by means of a properly tuned radial electric field. Becau… more
Date: September 6, 2012
Creator: Gueroult, Renaud
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mirror Sub-Assembly End-Effector Design

Description: The Optic Assembly Building (OAB) is a facility where large optical mirror units are assembled and installed into Line Replaceable Units (LRUs) for deployment into the National Ignition Facility (NIF) laser system. The New Optics Insertion Device (NOID) is a powered jib crane specially designed to handle large optical assemblies. The NOID arm has three degrees of freedom. it can rotate about the vertical boom, travel up and down the boom, and extend away from and retract in towards the boom. Th… more
Date: January 8, 2007
Creator: Butlin, B
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Magnetic Centrifugal Mass Filter

Description: Mass filters using rotating plasmas have been considered for separating nuclear waste and spent nuclear fuel. We propose a new mass filter that utilizes centrifugal and magnetic confinement of ions in a way similar to the asymmetric centrifugal trap. This magnetic centrifugal mass filter is shown to be more proliferation resistant than present technology. This filter is collisional and produces well confined output streams, among other advantages. _______________________________________________… more
Date: August 4, 2011
Creator: Fisch, Abraham J. Fetterman and Nathaniel J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Applying Alpha-Channeling to Mirror Machines

Description: The α-channeling effect entails the use of radio-frequency waves to expel and cool high-energetic α- particles born in a fusion reactor; the device reactivity can then be increased even further by redirecting the extracted energy to fuel ions. Originally proposed for tokamaks, this technique has also been shown to benefi t open-ended fusion devices. Here, the fundamental theory and practical aspects of α- channeling in mirror machines are reviewed, including the influence of magnetic field inho… more
Date: March 16, 2012
Creator: Zhmoginov, A. I. & Fisch, N. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Magnetic mirror structure for testing shell-type quadrupole coils

Description: This paper presents magnetic and mechanical designs and analyses of the quadrupole mirror structure to test single shell-type quadrupole coils. Several quadrupole coils made of different Nb{sub 3}Sn strands, cable insulation and pole materials were tested using this structure at 4.5 and 1.9 K. The coils were instrumented with voltage taps, spot heaters, temperature sensors and strain gauges to study their mechanical and thermal properties and quench performance. The results of the quadrupole mi… more
Date: October 1, 2009
Creator: Andreev, N.; Barzi, E.; Bossert, R.; Chlachidze, G.; Kashikhin, V. S.; Kashikhin, V. V. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Table Top 1 Circuitry

Description: Abstract: "This is a detailed report on the circuitry, the electrical components, and the electrical engineering problems of Table Top I, the 140-kilojoule experimental model of a magnetic mirror machine being developed at the University of California Radiation Laboratory, Livermore."
Date: July 21, 1954
Creator: Cummings, David B. & Wharton, Charles B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulation studies of non-neutral plasma equilibria in an electrostatic trap with a magnetic mirror

Description: The equilibrium of an infinitely long, strongly magnetized, non-neutral plasma confined in a Penning-Malmberg trap with an additional mirror coil has been solved analytically [J. Fajans, Phys. Plasmas 10, 1209 (2003)] and shown to exhibit unusual features. Particles not only reflect near the mirror in the low field region, but also may be weakly trapped in part of in the high field region. The plasma satisfies a Boltzmann distribution along field lines; however, the density and the potential va… more
Date: June 5, 2006
Creator: Gomberoff, K; Fajans, J; Wurtele, J; Friedman, A; Grote, D P; Cohen, R H et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Grazing incidence beam expander

Description: A Grazing Incidence Beam Expander (GIBE) telescope is being designed and fabricated to be used as an equivalent end mirror in a long laser resonator cavity. The design requirements for this GIBE flow down from a generic Free Electron Laser (FEL) resonator. The nature of the FEL gain volume (a thin, pencil-like, on-axis region) dictates that the output beam be very small. Such a thin beam with the high power levels characteristic of FELs would have to travel perhaps hundreds of meters or more be… more
Date: January 1, 1985
Creator: Akkapeddi, P.R.; Glenn, P.; Fuschetto, A.; Appert, Q. & Viswanathan, V.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Resonator optical designs for free electron lasers

Description: The output beam from free-electron lasers tends to be a thin, pencil-like beam because of the nature of the gain volume. For moderate power devices, mirror damage considerations imply that the beam has to travel many meters before it can expand enough to allow retro-reflection from state-of-the-art mirrors. However, use of grazing incidence optics can resolve the problem of damage to the optical elements and result in a cavity of reasonable dimensions. The optical design considerations for such… more
Date: January 1, 1985
Creator: Viswanathan, V.K.; Saxman, A. & Woodfin, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Switchable mirrors based on nickel-magnesium films

Description: A new type of electrochromic mirror electrode based on reversible uptake of hydrogen in nickel magnesium alloy films is reported. Thin,magnesium-rich Ni-Mg films prepared on glass substrates by cosputtering from Ni and Mg targets are mirror-like in appearance and have low visible transmittance. Upon exposure to hydrogen gas or on reduction in alkaline electrolyte, the films take up hydrogen and become transparent. When hydrogen is removed, the mirror properties are recovered. The transition is … more
Date: January 16, 2001
Creator: Richardson,Thomas J.; Slack, Jonathan L.; Armitage, Robert D.; Kostecki, Robert; Farangis, Baker & Rubin, Michael D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Wave-Driven Rotation In Centrifugal Mirrors

Description: Centrifugal mirrors use supersonic rotation to provide axial confinement and enhanced stability. Usually the rotation is produced using electrodes, but these electrodes have limited the rotation to the Alfven critical ionization velocity, which is too slow to be useful for fusion. Instead, the rotation could be produced using radio frequency waves. A fixed azimuthal ripple is a simple and efficient wave that could produce rotation by harnessing alpha particle energy. This is an extension of the… more
Date: March 28, 2011
Creator: Fisch, Abraham J. Fetterman and Nathaniel J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Testing of Nb3Sn quadrupole coils using magnetic mirror structure

Description: This paper describes the design and parameters of a quadrupole mirror structure for testing the mechanical, thermal and quench performance of single shell-type superconducting quadrupole coils at field, current and force levels similar to that of real magnet. The concept was experimentally verified by testing two quadrupole coils, previously used in quadrupole models, in the developed mirror structure in the temperature range from 4.5 to 1.9 K. The coils were instrumented with voltage taps, hea… more
Date: July 1, 2009
Creator: Zlobin, A. V.; Andreev, N.; Barzi, E.; Bossert, R.; Chlachidze, G.; Kashikhin, V. S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Theoretical tool movement required to diamond turn an off-axis paraboloid on axis

Description: High-quality, off-axis parabolic reflectors, required by the CTR and laser-fusion programs at Lawrence Livermore Laboratory (LLL) and other ERDA laboratories, are currently manufactured by hand. There are several drawbacks to this method, including lead times of up to a year, costs in excess of $75,000 for a small reflector, and unsatisfactory limits to the tolerances obtainable. This situation has led to a search for cheaper and more accurate methods of manufacturing off-axis paraboloids. An a… more
Date: December 19, 1975
Creator: Thompson, D.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

[Hall of Mirrors]

Description: Photograph of the Hall of Mirror in the Palace of Versailles in Versailles, France. The hall is visible in the foreground filled with people. The people have their backs turned to the camera.
Date: unknown
Creator: Gough, Ray
Item Type: Refine your search to only Photograph
Partner: UNT College of Visual Arts + Design
open access

The Kinetic Stabilizer: Further Calculations and Options

Description: The Kinetic Stabilizer, employing injected and mirror-reflected ion beams, represents a method for stabilizing axisymmetric mirror and tandem mirror systems. Building on earlier work, this paper presents further calculations on the concept and explores some new options that promise to enhance its capabilities.
Date: June 19, 2002
Creator: Post, Richard F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Some Aspects of the Radial Stability in a Magnetic Mirror Machine

Description: Abstract: "The radial motion of an ion in an axially symmetric magnetic field is discussed. It is pointed out that particles of constant velocity have clearly defined upper limits to their radial motion. This is a result of the other constant of the motion, the canonical angular momentum. These limits are independent of the number of times an ion is reflected from the mirrors, providing the field is truly axially symmetric."
Date: March 19, 1954
Creator: Henrich, Louis R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle Trajectories in Homogeneous Magnetic Field with Linear Time Dependence

Description: Abstract: "Formulas are derived for the trajectory of a charged particle in a magnetic field which is a linear function of time. Graphs of certain functions are presented, by means of which a trajectory with given initial position and velocity may be plotted."
Date: August 9, 1955
Creator: Gardner, Clifford S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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