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Your search keyword '"Wong, K. L."' showing total 16 results
Start Over Author "Wong, K. L." Journal aip conference proceedings
16 results on '"Wong, K. L."'

2. Measuring the Ionization Balance of Gold in a Low-Density Plasma of Importance to ICF.

Author

May, M. J., Beiersdorfer, P., Schneider, M., Terracol, S., Wong, K. L., Fournier, K., Wilson, B., Scofield, J. H., Reed, K. J., Brown, G., Porter, F. S., Kelley, R., Kilbourne, C. A., and Boyce, K. R.

Subjects
SPECTRUM analysis, SPECTROMETERS, ELECTRON beams, CALORIMETERS, ELECTRON distribution, PHYSICAL sciences
Abstract

Charge state distributions (CSDs) have been determined in low density (≈1012 cm-3) gold plasmas having either a monoenergetic beam (EBeam = 2.66, 3.53 and 4.54 keV) or experimentally simulated thermal electron distributions (Te = 2.0, 2.5 and 3.0 keV). These plasmas were created in the Livermore electron beam ion traps EBIT-I and EBIT-II. Line emission and radiative recombination features of Ni to Kr-like gold ions were recorded in the x-ray region with a crystal spectrometer and a photometrically calibrated microcalorimeter. The CSDs in the experimentally simulated thermal plasmas were inferred by fitting the observed 4f→3d and 5f→3d lines with synthetic spectra from the Hebrew University Lawrence Livermore Atomic Code (HULLAC). Additionally, the CSDs in the beam plasmas were inferred both from fitting the line emission and fitting the radiative recombination emission to calculations from the General Relativistic Atomic Structure Program (GRASP). Despite the relatively simple atomic physics in the low density plasma, differences existed between the experimental CSDs and the simulations from several available codes (e.g. RIGEL). Our experimental CSD relied upon accurate electron impact cross sections provided by HULLAC. To determine their reliability, we have experimentally determined the cross sections for several of the n=3→4 and n=3→5 excitations in Ni to Ga-like Au and compared them to distorted wave calculations. Recent Au spectra recorded during experiments at the HELEN laser facility are presented and compared with those from EBIT-I and EBIT-II. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2004
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3. Electron Cyclotron Current Drive in DIII-D: Experiment and Theory.

Author

Prater, R., Petty, C.C., Luce, T.C., Harvey, R.W., Choi, M., La Haye, R.J., Lin-Liu, Y.-R., Lohr, J., Murakami, M., Wade, M.R., and Wong, K.-L.

Subjects
TOKAMAKS, ELECTRIC currents, CYCLOTRONS, ELECTRONS, FOKKER-Planck equation, ELECTRIC discharges
Abstract

Experiments on the DIII-D tokamak in which the measured off-axis electron cyclotron current drive has been compared systematically to theory over a broad range of parameters have shown that the Fokker-Planck code CQL3D provides an excellent model of the relevant current drive physics. This physics understanding has been critical in optimizing the application of ECCD to high performance discharges, supporting such applications as suppression of neoclassical tearing modes and control and sustainment of the current profile. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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5. Using high resolution x-ray spectroscopy of laser and EBIT plasma sources to test atomic models.

Author

Fournier, K. B., Foord, M. E., Wilson, B. G., Glenzer, S. H., Wong, K. L., Thoe, R. S., Beiersdorfer, P., and Springer, P. T.

Subjects
PLASMA astrophysics, X-ray spectroscopy
Abstract

Understanding of the formation and dynamics of non-LTE plasmas is crucial to inertial and magnetic fusion energy research as well as astrophysical research. The intrinsic complexity of non-LTE systems at high density and the remote nature of x-ray emitting astrophysical plasmas present stringent challenges to our models. Confidence in our atomic kinetics models is gained through comparisons with experimental data from plasmas that are well diagnosed by techniques that are independent of spectroscopic models. To this end experiments with Au foils buried in Be targets have been designed to achieve steady-state, gradient free conditions on the Nova laser. Simulations of the experiments that use detailed atomic kinetics models have shown good agreement with measured x-ray spectra. Large sets of data and many detailed processes are included in these models; issues involving satellite configurations, accuracy of dielectronic recombination rates and non-zero optical depths for resonant lines have to be addressed. To test the detailed atomic data used in the models, experiments have been carried out on an electron beam ion trap (EBIT). The EBIT experiments measure directly the contribution of collisional excitation, dielectronic recombination and radiative recombination to the observed x-ray lines. Good agreement is found between the EBIT spectra and the HULLAC data used to interpret the Nova buried layer experiments. [ABSTRACT FROM AUTHOR]

Published
2000

10. ICRF in D-T plasmas in TFTR

Author

Wilson, J. R., primary, Batha, S., additional, Darrow, D., additional, Hosea, J. C., additional, Jaeger, E., additional, Levinton, F., additional, Majeski, R., additional, Murakami, M., additional, Phillips, C. K., additional, Rogers, J., additional, Schilling, G., additional, Stevens, J., additional, Taylor, G., additional, Wong, K. L., additional, and Zweben, S., additional

Published
1996
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11. Deuterium-tritium experiments on TFTR

Author

Bretz, N. L., primary, Adler, H., additional, Alling, P., additional, Ancher, C., additional, Anderson, H., additional, Anderson, J. W., additional, Arunasalam, V., additional, Ascione, G., additional, Barnes, C. W., additional, Barnes, G., additional, Batha, S., additional, Bateman, G., additional, Beer, M., additional, Bell, M. G., additional, Bell, R., additional, Bitter, M., additional, Blanchard, W., additional, Brunkhorst, C., additional, Budny, R., additional, Bush, C. E., additional, Camp, R., additional, Caorlin, M., additional, Carnevale, H., additional, Cauffman, S., additional, Chang, Z., additional, Cheng, C., additional, Chrzanowski, J., additional, Collins, J., additional, Coward, G., additional, Cropper, M., additional, Darrow, D. S., additional, Daugert, R., additional, DeLooper, J., additional, Dorland, W., additional, Dudek, L., additional, Duong, H., additional, Durst, R., additional, Efthimion, P. C., additional, Ernst, D., additional, Evensen, H., additional, Fisch, N., additional, Fisher, R., additional, Fonck, R. J., additional, Fredd, E., additional, Fredrickson, E., additional, Fromm, R., additional, Fu, G., additional, Fujita, T., additional, Furth, H. P., additional, Garzotto, V., additional, Gentile, C., additional, Gilbert, J., additional, Giola, J., additional, Gorelenkov, N., additional, Grek, B., additional, Grisham, L. R., additional, Hammett, G., additional, Hanson, G. R., additional, Hawryluk, R. J., additional, Heidbrink, W., additional, Herrmann, H. W., additional, Hill, K. W., additional, Hosea, J., additional, Hsuan, H., additional, Hughes, M., additional, Hulse, R., additional, Janos, A., additional, Jassby, D. L., additional, Jobes, F. C., additional, Johnson, D. W., additional, Johnson, L. C., additional, Kalish, M., additional, Kamperschroer, J., additional, Kesner, J., additional, Kugel, H., additional, Labik, G., additional, Lam, N. T., additional, LaMarche, P. H., additional, Lawson, E., additional, LeBlanc, B., additional, Levine, J., additional, Levinton, F. M., additional, Loesser, D., additional, Long, D., additional, Loughlin, M. J., additional, Machuzak, J., additional, Majeski, R., additional, Mansfield, D. K., additional, Marmar, E., additional, Marsala, R., additional, Martin, A., additional, Martin, G., additional, Mauel, M., additional, Mazzucato, E., additional, McCarthy, M. P., additional, McChesney, J., additional, McCormack, B., additional, McCune, D. C., additional, McGuire, K. M., additional, McKee, G., additional, Meade, D. M., additional, Medley, S. S., additional, Mikkelsen, D. R., additional, Mirnov, S. V., additional, Mueller, D., additional, Murakami, M., additional, Murphy, J. A., additional, Nagy, A., additional, Navratil, G. A., additional, Nazikian, R., additional, Newman, R., additional, Norris, M., additional, O’Connor, T., additional, Oldaker, M., additional, Ongena, J., additional, Osakabe, M., additional, Owens, D. K., additional, Park, H., additional, Park, W., additional, Parks, P., additional, Paul, S. F., additional, Pearson, G., additional, Perry, E., additional, Persing, R., additional, Petrov, M., additional, Phillips, C. K., additional, Phillips, M., additional, Pitcher, S., additional, Pysher, R., additional, Qualls, A. L., additional, Raftapoulos, S., additional, Ramakrishnan, S., additional, Ramsey, A., additional, Rasmunsen, D. A., additional, Redi, M. H., additional, Renda, G., additional, Rewoldt, G., additional, Roberts, D., additional, Rogers, J., additional, Rossmassler, R., additional, Roquemore, A. L., additional, Ruskov, E., additional, Sabbaugh, S. A., additional, Sasao, M., additional, Schilling, G., additional, Schivell, J., additional, Schmidt, G. L., additional, Scillia, R., additional, Scott, S. D., additional, Semenov, I., additional, Senko, T., additional, Sesnic, S., additional, Sissingh, R., additional, Skinner, C. H., additional, Snipes, J., additional, Stencel, J., additional, Stevens, J., additional, Stevenson, T., additional, Stodiek, W., additional, Strachan, J. D., additional, Stratton, B. C., additional, Swanson, J., additional, Synakowski, E., additional, Takahashi, H., additional, Tang, W., additional, Taylor, G., additional, Terry, J., additional, Thompson, M. E., additional, Tighe, W., additional, Timberlake, J. R., additional, Tobita, K., additional, Towner, H. H., additional, Tuszewski, M., additional, Von Halle, A., additional, Vannoy, C., additional, Viola, M., additional, Goeler, S. von, additional, Voorhees, D., additional, Walters, R. T., additional, Wester, R., additional, White, R., additional, Wieland, R., additional, Wilgen, J. B., additional, Williams, M., additional, Wilson, J. R., additional, Winston, J., additional, Wright, K., additional, Wong, K.-L., additional, Woskov, P., additional, Wurden, G. A., additional, Yamada, M., additional, Yoshikawa, S., additional, Young, K. M., additional, Zarnstorff, M. C., additional, Zavereev, V., additional, and Zweben, S. J., additional

Published
1995
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15. End points in discharge cleaning on TFTR <ATOTHER>@f|</ATOTHER>.

Author

Mueller, D., Dylla, H. F., Bell, M. G., Blanchard, W. R., Bush, C. E., Gettelfinger, G., Hawryluk, R. J., Hill, K. W., Janos, A. C., Jobes, F. C., LaMarche, P. H., Owens, D. K., Pearson, G., Ramsey, A. T., Schivell, J. F., Stevens, J., Tait, G. D., Ulrikson, M. A., Vannoy, C., and Wong, K. L.

Published
1990
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