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in subjects: "Plasma Diagnostics"

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Diagnostics for the Biased Electrode Experiment on NSTX

A linear array of four small biased electrodes was installed in NSTX in an attempt to control the width of the scrape-off layer (SOL) by creating a strong local poloidal electric field. The set of electrodes were separated poloidally by a 1 cm gap between electrodes and were located slightly below the midplane of NSTX, 1 cm behind the RF antenna and oriented so that each electrode is facing approximately normal to the magnetic field. Each electrode can be independently biased to ±100 volts. Pre… more

Date: March 20, 2009

Creator: A.L. Roquemore, S.J. Zweben, C.E. Bush, R. Kaita, R. J. Marsalsa, and R.J. Maqueda

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Thomson scattering diagnostic analyses to determine the energetic particle distributions in TFTR

The research completed and in progress for the first period of this grant is reviewed. Specific scattering scenarios for TFTR and JET and ITER were studied. The Lodestar scattering code, SKATR, was upgraded to include anisotropic energetic ion distributions and an analytic diffraction formulation was completed. Research continues on JET studies and upgrading the code for JET and ITER relevant conditions.

Date: February 12, 1993

Creator: Aamodt, R. E.; Cheung, P. & Russell, D. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Thomson scattering diagnostic analyses to determine the energetic particle distributions in TFTR. Annual performance report

Date: February 12, 1993

Creator: Aamodt, R. E.; Cheung, P. & Russell, D. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Thomson scattering diagnostic analyses to determine the energetic particle distributions in TFTR. Final report

Lodestar has been an active participant in the low power Collective Thomson Scattering (CTS) diagnostic at TFTR in collaboration with MIT. Extensive studies were conducted regarding the use of gyrotron scattering as a low cost diagnostic for both energetic ions and alpha particles on TFTR. The numerical scattering code has been improved and compared with similar code developed at JET. The authors have participated and assisted in the CTS experiments through onsite visits and have successfully p… more

Date: February 16, 1995

Creator: Aamodt, R. E.; Cheung, P. Y. & Russell, D. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Fundamental studies of fusion plasmas. Final report

Lodestar has carried out a vigorous research program in the areas of rf, edge plasma and divertor physics, with emphasis largely geared towards improving the understanding and performance of ion-cyclotron heating and current drive (ICRF) systems. Additionally, a research program in the field of edge plasma and divertor modeling was initiated. Theoretical work on high power rf sheath formation for multi-strap rf arrays was developed and benchmarked against recent experimental data from the new J… more

Date: January 30, 1998

Creator: Aamodt, R.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Analysis of neon soft x-ray spectra from short-pulse laser-produced plasmas

We report preliminary results from the analysis of streaked soft x-ray neon spectra obtained from the interaction of a picosecond Nd:glass laser with a gas jet target. In these experiments streaked spectra show prompt harmonic emission followed by longer time duration soft x-ray line emission. The majority of the line emission observed was found to originate from Li- and Be-like Ne and the major transitions in the observed spectra have been identified. Li-like emission lines were observed to de… more

Date: April 1, 1993

Creator: Abare, A. C.; Keane, C. J.; Crane, J. K.; DaSilva, L. B.; Lee, R. W.; Perry, M. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The calculation of satellite line structures in highly stripped plasmas

This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). Recently developed high-resolution x-ray spectrographs have made it possible to measure satellite structures from various plasma sources with great detail. These lines are weak optically thin lines caused by the decay of dielectronic states and generally accompany the resonance lines of H-like and He-like ions. The Los Alamos atomic physics and kine… more

Date: November 1, 1998

Creator: Abdallah, J. Jr.; Kilcrease, D. P.; Faenov, A. Ya. & Pikuz, T. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Heavy ion beam probe measurements of ECH method plasma in the Advanced Toroidal Facility

A Heavy Ion Beam Probe (HIBP) has been installed on the Advanced Toroidal Facility (ATF) and used to measure the plasma potential and also make density fluctuation measurements during ECH plasmas. The initial results of the potential profile measurements are presented and related to spectroscopic rotation measurements using simple momentum balance equations. Also, a summary of the density fluctuation measurements made to date is given along with a brief comparison with similar HIBP measurements… more

Date: January 1, 1991

Creator: Aceto, S. C.; Schwelberger, J. G.; Zielinski, J. J.; Connor, K. A.; Crowley, T. P.; Heard, J. W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Diagnostics of Shiva Nova produced high yield thermonuclear events

Experiments with the Shiva Nova laser facility which produce yield levels of scientific breakeven and above will result in neutron, x-ray and particle fluxes which will require specific attention to the survivability of diagnostic instrumentation. These yield levels will also allow the utilization of new diagnotics techniques which can provide detailed information on the state of the imploded fuel and pusher shells.

Date: January 1, 1978

Creator: Ahlstrom, H. G.; Banner, D. L.; Boyle, M. J.; Campbell, E. M.; Coleman, L. W.; Koppel, L. N. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Laser plasma experiments relevant to laser produced implosions

No Description Available.

Date: November 1, 1974

Creator: Ahlstrom, H. G.; Holzrichter, J. F.; Manes, K. R.; Coleman, L. W.; Speck, D. R.; Haas, R. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Diagnostics of inertial confinement fusion experiments

The requirements of plasma temperature and particle energies are effectively the same for inertial confinement fusion, ICF, and magnetic containment fusion, MCF. The n/tau product must also be similar; however, in ICF we increase the density to achieve efficient fuel burn up. Reactor gain pellets are expected to require densities of up to 10/sup 4/ x liquid density of DT. This corresponds to n approximately 10/sup 26/ cm-/sup 3/. The dimensions of the compressed core are of the order of microns… more

Date: August 1, 1977

Creator: Ahlstrom, H.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Laser fusion experiments at LLL

These notes present the experimental basis and status for laser fusion as developed at LLL. Two other chapters, one authored by K.A. Brueckner and the other by C. Max, present the theoretical implosion physics and laser plasma interaction physics. The notes consist of six sections. The first is an introductory section which provides some of the history of inertial fusion and a simple explanation of the concepts involved. The second section presents an extensive discussion of diagnostic instrume… more

Date: June 16, 1980

Creator: Ahlstrom, H.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Laser fusion experiments at the Lawrence Livermore Laboratory

A short review is given of some of the important dates in the experimental fusion program at Livermore. A few of the parameters of the laser systems which are being used for these experiments are mentioned. Some information about specialized diagnostics which have been developed at the Livermore Laboratory for these experiments is described. The focusing arrangements for each of the systems are discussed. Experiments both on planar targets and on targets for laser fusion are described. (auth)

Date: October 1, 1975

Creator: Ahlstrom, H.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Laser fusion monthly -- August 1980

This report documents the monthly progress for the laser fusion research at Lawrence Livermore National Laboratory. First it gives facilities report for both the Shiva and Argus projects. Topics discussed include; laser system for the Nova Project; the fusion experiments analysis facility; optical/x-ray streak camera; Shiva Dante System temporal response; 2{omega}{sub 0} experiment; and planning for an ICF engineering test facility.

Date: August 1, 1980

Creator: Ahlstrom, H.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Laser fusion monthly, February 1981

This report is divided into the following sections: (1) facility reports (Argus and Shiva); (2) Nova project; and (3) fusion experiments. In the Fusion Experiments section of this report, the author describes the results of a series of experiments on Shiva which further the understanding of the production and transport of suprathermal electrons. He found that of the suprathermal electrons which strike a laser irradiated disk target or which interact with the rear surface of a half Cairn hohlrau… more

Date: February 1, 1981

Creator: Ahlstrom, H.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Physics of laser fusion. Volume II. Diagnostics of experiments on laser fusion targets at LLNL

These notes present the experimental basis and status for laser fusion as developed at LLNL. There are two other volumes in this series: Vol. I, by C.E. Max, presents the theoretical laser-plasma interaction physics; Vol. III, by J.F. Holzrichter et al., presents the theory and design of high-power pulsed lasers. A fourth volume will present the theoretical implosion physics. The notes consist of six sections. The first, an introductory section, provides some of the history of inertial fusion a… more

Date: January 1, 1982

Creator: Ahlstrom, H.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Use of lasers for accelerator diagnostics. I. Elementary concepts

The coming development of high current linear accelerators for H/sup -/ ions requires improvement in diagnostic instrumentation that will permit accurate determination of the occupied phase space. A laser photo-detachment method is proposed to provide this new capability. The fundamental processes that are operative are explored and limitations to the accuracy of measurements using this diagnostic are considered. Questions to be addressed subsequently include the experimental arrangement requir… more

Date: January 1, 1979

Creator: Aldridge, J.P. & Hayward, T.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Tests and Calibration of the NIF Neutron Time of Flight Detectors

The National Ignition Facility (NIF) Neutron Time of Flight (NTOF) diagnostic will measure neutron yield and ion temperature in all NIF campaigns in DD, DT, and THD* implosions. The NIF NTOF diagnostic is designed to measure neutron yield from 109 to 2 x 1019. The NTOF consists of several detectors of varying sensitivity located on the NIF at about 5 m and 20 m from the target. Production, testing, and calibration of the NIF NTOF detectors have begun at the Laboratory for Laser Energetics (LLE)… more

Date: May 15, 2008

Creator: Ali, Z. A.; Glebov, V. Yu.; Cruz, M.; Duffy, T.; Stoeckl, C.; Roberts, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Plasma Diagnostic Calibration and Characterizations with High Energy X-rays

National Security Technologies’ High Energy X-ray (HEX) Facility is unique in the U.S. Department of Energy complex. The HEX provides fluorescent X-rays of 5 keV to 100 keV with fluence of 10^5–10^6 photons/cm^2/second at the desired line energy. Low energy lines can be filtered, and both filters and fluorescers can be changed rapidly. We present results of calibrating image plates (sensitivity and modulation transfer function), a Bremsstrahlung spectrometer (stacked filters and image plates), … more

Date: June 5, 2009

Creator: Ali, Zaheer

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A Review of X-ray Diagnostic Calibrations in the 2 to 100 keV Region Using the High Energy X-ray Calibration Facility (HEX)

The precise and accurate measurement of X-rays in the 2 keV to 100 keV region is crucial to the understanding of HED plasmas and warm dense matter in general. With the emergence of inertially confined plasma facilities as the premier platforms for ICF, laboratory astrophysics, and national security related plasma experiments, the need to calibrate diagnostics in the high energy X-ray regime has grown. At National Security Technologies High Energy X-ray Calibration Facility (HEX) in Livermore, C… more

Date: May 19, 2010

Creator: Ali, Zaheer; Pond, T.; Buckles, R. A.; Maddox, B. R.; Chen, C. D.; DeWald, E. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Compact Optical Technique for Streak Camera Calibration

The National Ignition Facility is under construction at the Lawrence Livermore National Laboratory for the U.S. Department of Energy Stockpile Stewardship Program. Optical streak cameras are an integral part of the experimental diagnostics instrumentation. To accurately reduce data from the streak cameras a temporal calibration is required. This article describes a technique for generating trains of precisely timed short-duration optical pulses that are suitable for temporal calibrations.

Date: April 2004

Creator: Allen, Curt; Davies, Terence; Janson, Frans; Justin, Ronald; Marshall, Bruce; Sweningsen, Oliver et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Thomson-scattering measurements of electron temperature and density in a plasma channel created by a relativistic electron beam

The electron density (n/sub e/) and temperature (T/sub e/) of the plasma channel created by the propagation of a relativistic electron beam in air have been measured by a ruby laser Thomson scattering diagnostic. The measurements were made at the MIMI electron beam accelerator (1.6 MV, 21 kA, 70 ns) at various times during the plasma channel development, with 25 ns temporal resolution and 2 mm radial resolution. For example, in 5 Torr air, at the time of maximum electron beam current, the resul… more

Date: January 1, 1983

Creator: Allen, G. R.; Parke Davis, H. & Brandenburg, J. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Edge diagnostics for tandem mirror machines

The edge plasma in a tandem mirror machine shields the plasma core from cold neutral gas and impurities. A variety of diagnostics are used to measure the fueling, shielding, and confinement of the edge plasma in both the end plug and central cell regions. Fast ion gauges and residual gas analyzers measure the gas pressure and composition outside of the plasma. An array of Langmuir probes is used to measure the electron density and temperature. Extreme ultraviolet (euv) and visible spectroscopy … more

Date: September 14, 1984

Creator: Allen, S. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Radiative and SOL experiments in open and baffled divertors on DIII-D

The authors present recent progress towards an understanding of the physical processes in the divertor and scrape-off-layer (SOL) plasmas in DIII-D. This has been made possible by a combination of new diagnostics, improved computational models, and changes in divertor geometry. They have focused primarily on ELMing H-mode discharges. The physics of Partially Detached Divertor (PDD) plasmas, with divertor heat flux reduction by divertor radiation enhancement using D{sub 2} puffing, has been stud… more

Date: November 1, 1998

Creator: Allen, S. L.; Brooks, N. H. & Bastasz, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department