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Your search keyword '"J. Kamperschroer"' showing total 3 results
Start Over Author "J. Kamperschroer" Journal journal of nuclear materials
3 results on '"J. Kamperschroer"'

1. Measurements of tritium recycling and isotope exchange in TFTR

Author

A. Nagy, C.H. Skinner, D. P. Stotler, D. Mueller, and J. Kamperschroer

Subjects
Tritium illumination, Nuclear and High Energy Physics, Chemistry, Balmer series, Plasma, Dissociation (chemistry), symbols.namesake, Nuclear Energy and Engineering, Deuterium, symbols, General Materials Science, Tritium, Plasma diagnostics, Atomic physics, Spectroscopy
Abstract

Tritium Balmer-alpha (T{sub {alpha}}) emission, along with H{sub {alpha}} and D{sub {alpha}} is observed in the current D-T experimental campaign in TFTR. The data are a measure of the fueling of the plasma by tritium accumulated in the TFTR limiter and the spectral profile maps neutral hydrogenic velocities. T{sub {alpha}} is relatively slow to appear in tritium neutral beam heated discharges, (T{sub {alpha}}/(H{sub {alpha}} + D{sub {alpha}} + T{sub {alpha}}) = 11% after 8 tritium-only neutral beam discharges). In contrast, the T{sub {alpha}} fraction in a sequence of six discharges fueled with tritium puff,s increased to 44%. Larger transient increases (up to 75% T{sub {alpha}}) were observed during subsequent tritium gas puffs. Analysis of the Doppler broadened spectral profiles revealed overall agreement with the dissociation, charge exchange, sputtering and reflection velocities predicted by the neutral Monte-Carlo code DEGAS with some deficiency in the treatment of dissociation products in the 10--100 eV range.

Published
1997
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2. Plasma-surface interactions in TFTR DT experiments

Author

Manfred Bitter, D. K. Owens, L. Dudek, W. Park, M. Murakami, Fred Levinton, George McKee, T. Stevenson, J. D. Strachan, Mamiko Sasao, D. K. Mansfield, William Tang, A.C. Janos, S. von Goeler, C.A. Gentile, R. Camp, C. E. Bush, J. DeLooper, Darin Ernst, H. Anderson, Takeo Nishitani, R. J. Hawryluk, G. L. Schmidt, N. Gorelenkov, J. H. Rogers, J. R. Wilson, B. Grek, Raffi Nazikian, C.H. Skinner, S. S. Medley, A. Martin, B. LeBlanc, M. Norris, R. Durst, J.L. Terry, D. Ashcroft, Michael Loughlin, N. T. Lam, Robert Budny, F. C. Jobes, S. F. Paul, J.A. Snipes, L. C. Johnson, J.F. Schivell, Chio-Zong Cheng, D.L. Jassby, C. K. Phillips, M.E. Thompson, L. R. Grisham, G. Pearson, M. Caorlin, David A Rasmussen, M. Leonard, A. Nagy, B. McCormack, David W. Johnson, R. Sissingh, H.W. Hermann, G. Taylor, C. Vannoy, N. Fromm, G. A. Wurden, R. M. Wieland, Masaki Osakabe, Gregory R. Hanson, J.C. Hosea, M. H. Redi, W. R. Blanchard, S. Cauffman, S. H. Batha, P. C. Efthimion, Guoyong Fu, E. Perry, Earl Marmar, M. Oldaker, N. Bretz, R. Rossmassler, J.L. Anderson, Masaaki Yamada, R. Fisher, Hyeon K. Park, William Heidbrink, K. McGuire, P. H. LaMarche, D. R. Mikkelsen, S. D. Scott, K. W. Hill, A. von Halle, D. Voorhees, M. C. Zarnstorff, H.W. Kugel, K. M. Young, H. Adler, D. Roberts, J. McChesney, John B Wilgen, A. T. Ramsey, R.T. Walters, D.M. Meade, S. Pitcher, Harold P. Furth, M. G. Bell, H.H. Duong, Z. Chang, E. Ruskov, T. O'Connor, G. Barnes, J. Machuzak, M. Williams, M. P. Petrov, H. Hsuan, R.J. Fonck, J. Kamperschroer, E.D. Fredrickson, K. L. Wong, C. Ancher, J. E. Stevens, G. Schilling, S. Raftopoulos, Gregory W. Hammett, J. Collins, M. Tuszewski, D. Mueller, Richard Majeski, Brentley Stratton, Cris W. Barnes, S. J. Zweben, E. Mazzucato, D.S. Darrow, S.A. Sabbagh, E. J. Synakowski, P. Alling, R. Newman, A. L. Roquemore, R. E. Bell, D. C. McCune, and G. Coward

Subjects
inorganic chemicals, Nuclear and High Energy Physics, Tokamak, Lawson criterion, chemistry.chemical_element, Plasma, Alpha particle, Fusion power, law.invention, Nuclear Energy and Engineering, chemistry, law, Limiter, General Materials Science, Lithium, Atomic physics, Helium
Abstract

TFTR has begun its campaign to study deuterium-tritium fusion under reactor-like conditions. Variable amounts of deuterium and tritium neutral beam power have been used to maximize fusion power, study alpha heating, investigate alpha particle confinement, and search for alpha driven plasma instabilities. Additional areas of study include energy and particle transport and confinement, ICRF heating schemes for DT plasmas, tritium retention, and fusion in high βp plasmas. The majority of this work is done in the TFTR supershot confinement regime. To obtain supershots, extensive limiter conditioning using helium fueled ohmic discharges and lithium pellet injection into ohmic and neutral beam heated plasmas is performed, resulting in a low recycling limiter. The relationship between recycling and core plasma confinement has been studied by using helium, deuterium and high-Z gas puffs to simulate high recycling limiter conditions. These studies show that confinement in TFTR supershots is very sensitive to the influx of neutral particles at the plasma edge.

Published
1995
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3. Production of high temperature and high density plasmas by controlling edge particle recycling in D-III divertor equilibria

Author

T. S. Taylor, Michiya Shimada, G. Bramson, J. Kamperschroer, J. Smith, E.S. Fairbanks, R. Chase, A. Colleraine, D. Vaslow, R. P. Seraydarian, L. Rottler, J. W. Tooker, J. Fasolo, R. T. Snider, T. Angel, J. Kim, Masayuki Nagami, J. Lohr, Shigeru Konoshima, R. J. Groebner, D. McColl, A. Kitsunezaki, T. Kobayashi, Naoyuki Miya, Tatsuma D. Matsuda, C. Armentrout, N.H. Brooks, Hiromasa Ninomiya, S.S. Wojtowicz, A. J. Lieber, M. Kasai, T. Hino, H. Yokomizo, R. Silagi, R.M. Hong, F. Blau, and G.L. Jahns

Subjects
Nuclear and High Energy Physics, Materials science, Nuclear Energy and Engineering, Divertor, Particle, High density, General Materials Science, Plasma, Atomic physics, Edge (geometry)
Published
1984
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