TFTR DT experiments

Strachan, J.D.; Batha, S. H.; Beer, M; Bell, M.G.; Bell, R. E.; Belov, A. M.; Berk, H. L.; Bernabei, S.; Bitter, M.; Breǐzman, B. N.; Bretz, N.; Budny, R.; Bush, C. E.; Callen, J. D.; Cauffman, Steve; Chang, Choong-Seock; Chang, Z.; Cheng, C. Z.; Darrow, D. S.; Dendy, R. O.; Dorland, W.; Duong, H. H.; Efthimion, P. C.; Ernst, Daniel; Evenson, H.; Fisch, Nathaniel J.; Fisher, R. K.; Fonck, R.J.; Fredrickson, E.; Fu, G. Y.; Furth, H. P.; Gorelenkov, N. N.; Goloborod’ko, V.; Grek, B.; Grisham, L.; Hammett, G. W.; Hawryluk, R. J.; Heidbrink, W. W.; Herrmann, H. W.; Herrmann, Mark; Hill, K. W.; Hogan, J.; Hooper, Brett A.; Hosea, J. C.; Houlberg, W. A.; Hughes, M.H.; Jassby, D.L.; Jobes, F. C.; Johnson, D. W.; Kaita, R.; Kaye, S. M.; Kesner, J.; Kim, J S; Kissick, M; Krasilnikov, A. V.; Kugel, H.; Kumar, Anil; Lâm, Nguyễn Thanh; LaMarche, P. H.; LeBlanc, B.; Levinton, F. M.; Ludescher, C.; Machuzak, J. S.; Majeski, R.; Manickam, J.; Mansfield, D. K.; Mauel, M. E.; Mazzucato, E.; McChesney, J. M.; McCune, D.; McKee, G. R.; McGuire, K.; Meade, D. M.; Medley, S. S.; Mikkelsen, D. R.; Mirnov, S.V.; Mueller, D.; Nagayama, Y.; Navratil, G. A.; Nazikian, R.; Okabayashi, M.; Osakabe, M.; Owens, D. K.; Park, H K; Park, W; Paul, S. F.; Петров, М. П.; Phillips, C. K.; Phillips, Michael W.; Phillips, P. E.; Ramsey, A. T.; Rice, B.; Redi, M. H.; Rewoldt, G.; Reznik, S. N.; Roquemore, A. L.; Rogers, J. H.; Ruskov, E.; Sabbagh, S.A.; Sasao, M.; Schilling, G.; Schmidt, G. L.; Scott, S.D.; Semenov, I.; Senko, T.; Skinner, C.H.; Stevenson, T. N.; Strait, E. J.; Stratton, B.; Stodiek, W.; Synakowski, E. J.; Takahashi, H.; Tang, W. M.; Taylor, G.; Thompson, Mark E.; Goeler, S. von; Halle, A. von; Walters, R.T.; Wang, Shaojie; White, R. B.; Wieland, R.; Williams, M. D.; Wilson, J. R.; Wong, K. L.; Wurden, G. A.; Yamada, Masaaki; Yavorski, V.; Young, K. M.; Zakharov, L.; Zarnstorff, M. C.; Zweben, S. J.

doi:10.1088/0741-3335/39/12b/008

Cited by 38 publications

(19 citation statements)

References 20 publications

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“…While the ICRF scenarios for the full-field DT phase of ITER have already been extensively explored in the past (see [30][31][32][33][34] and references therein), the heating schemes for the non-active half-field phase in hydrogen plasmas were not yet investigated carefully in large tokamaks. Recently, JET experiments have been designed to test some of these scenarios and numerical efforts for assessing their performance under ITER conditions have been put forward [35][36][37].…”

Section: Summary and Discussionmentioning

confidence: 99%

Experimental investigation of ion cyclotron range of frequencies heating scenarios for ITER's half-field hydrogen phase performed in JET

Lerche¹,

Eester²,

Johnson³

et al. 2012

Plasma Phys. Control. Fusion

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Two ion cyclotron range of frequencies (ICRF) heating schemes proposed for the half-field operation phase of ITER in hydrogen plasmas-fundamental H majority and second harmonic 3 He ICRF heating-were recently investigated in JET. Although the same magnetic field and RF frequencies (f ≈ 42 MHz and f ≈ 52 MHz, respectively) were used, the density and particularly the plasma temperature were lower than those expected in the initial phase of ITER. Unlike for the well-performing H minority heating scheme to be used in 4 He plasmas, modest heating efficiencies (η = P absorbed /P launched < 40%) with dominant electron heating were found in both H plasma scenarios studied, and enhanced plasma-wall interaction manifested by high radiation losses and relatively large impurity content in the plasma was observed. This effect was stronger in the 3 He ICRF heating case than in the H majority heating experiments and it was verified that concentrations as high as ∼20% are necessary to observe significant ion heating in this case. The RF acceleration of the heated ions was modest in both cases, although a small fraction of the 3 He ions reached about 260 keV in the second harmonic 3 He heating experiments when 11 Romanelli F et al 2010 Proc. 23rd IAEA Fusion Energy Conf. (Daejeon, Korea, 2010 5 MW of ICRF power was applied. Considerable RF acceleration of deuterium beam ions was also observed in some discharges of the 3 He heating experiments (where both the second and third harmonic ion cyclotron resonance layers of the D ions are inside the plasma) whilst it was practically absent in the majority hydrogen heating scenario. While hints of improved RF heating efficiency as a function of the plasma temperature and plasma dilution (with 4 He) were confirmed in the H majority case, the 3 He concentration was the main handle on the heating efficiency in the second harmonic 3 He heating scenario.

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Section: Summary and Discussionmentioning

confidence: 99%

Experimental investigation of ion cyclotron range of frequencies heating scenarios for ITER's half-field hydrogen phase performed in JET

Lerche¹,

Eester²,

Johnson³

et al. 2012

Plasma Phys. Control. Fusion

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“…The initial high-powered DT experiments in TFTR did not show any evidence for alpha-driven TAEs, either during or after termination of neutral beam injection [99]. This absence of TAE activity during standard "supershot" plasmas persisted through the TFTR DT run [44][45][46], including the highest fusion power discharges which reached up to β α (0)~0.3%, i.e. about ten times the level of the initially expected theoretical threshold.…”

Section: Initial Attempts To Study Alpha-driven Instabilitiesmentioning

confidence: 77%

“…There have been several reviews of the TFTR DT experiments [44][45][46] and machine operations [47][48]. Only a very brief summary of the overall TFTR DT experimental environment is given here for orientation.…”

Section: Overview Of Tftr Dt Experimentsmentioning

confidence: 99%

“…One way to summarize the TFTR alpha confinement measurements is to evaluate effective radial diffusion coefficients D å for the alphas in specific experimental circumstances [44]. Three independent estimates of the alpha diffusion coefficients were made, each based on the a different alpha diagnostics, as shown in Fig.…”

Section: Alpha Particle Behavior In Mhd-quiescent Dischargesmentioning

confidence: 99%

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Alpha Particle Physics Experiments in the Tokamak Fusion Test Reactor

Budny¹,

Darrow²,

Medley³

et al. 1998

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Alpha particle physics experiments were done on the TokamakFusion Test Reactor (TFTR) during its deuterium-tritium (DT) run from 1993-1997. These experiments utilized several new alpha particle diagnostics and hundreds of DT discharges to characterize the alpha particle confinement and wave-particle interactions. In general, the results from the alpha particle diagnostics agreed with the classical singleparticle confinement model in magnetohydrodynamic (MHD) quiescent discharges. Also, the observed alpha particle interactions with sawteeth, toroidal Alfvén eigenmodes (TAE), and ion cyclotron resonant frequency (ICRF) waves were roughly consistent with theoretical modeling. This paper reviews what was learned and identifies what remains to be understood. † åe (s) ≈ 0.4 (T e /10 keV) 3/2 / (n e /10 20 m -3 ) [3]This e-folding time on electrons is typically † åe ≈ 0.4 s at the plasma center of high performance TFTR shots in which T e (0) ≈ 10 keV and n e (0) ≈ 10 20 m -3 , corresponding to a few hundred thousand toroidal transits of the machine. The time required for alphas to reach thermal energy, including ion drag, is [1]:where E åo is the alpha birth energy and E crit is the alpha energy below which ion drag dominates the thermalization process (typically E crit ≈ 35 T e for alphas). For an idealized plasma small gyroradius without alpha loss, these collisions produce the well-known slowing-down distribution [1]: * J. Cordey, private communication (1998)

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“…Neoc lassical Tearin? Modes [1,2,[4][5][6][7][8][9]11,12,14,1%,15c,16,17,20a,2&,2Od,2Oe,21a,21b,22,241 Studies of neoclassical tearing modes have remained the dominant area of research on this grant. Our major role in their development was recognized through an invited paper at the 1998 Pittsburgh DPP-AB meeting 19,141 and through our inclusion as coauthors on some major TFI'R [2,4,8] and DIII-D 151 papers.…”

Section: San Diegomentioning

confidence: 99%

Large experiment data analysis collaboration. Final progress report for period November 15, 1997 - November 14, 1998

Callen¹

1998

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This is the third annual and final progress report on the current three-year Large Experiment Data Analysis Collaboration D O E grant DE-FG02-92ER54139. The funding level during this grant year was $150k. The participating personnel and their approximate degree of funded involvement in this research project has been as follows: J.D. Callen (PI 10% during academic year, 1 summer month); C.C. Hegna (Asst. Sci ., 25%); M.W. Kissick (postdoc, 11/97-3/98), T.A. Gianakon (postdoc, 15%, was on postdoc at Cadarache, France 4/98-6/98); and graduate students C. Ren (75% RA until 7/98 and then postdoc), and S.E. Kruger (25% RA). In addition, K.J. Comer, a graduate student who holds a DOE Magnetic Fusion Science Fellowship, participates in this research project. C. Ren completed his Ph.D. thesis entitled "A Study of Tearing Modes Using ECE from Tokamak Plasmas" in July 1998. He continues research on this grant as a postdoc on assignment at General Atomics in

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TFTR DT experiments

Cited by 38 publications

References 20 publications

Experimental investigation of ion cyclotron range of frequencies heating scenarios for ITER's half-field hydrogen phase performed in JET

Experimental investigation of ion cyclotron range of frequencies heating scenarios for ITER's half-field hydrogen phase performed in JET

Alpha Particle Physics Experiments in the Tokamak Fusion Test Reactor

Large experiment data analysis collaboration. Final progress report for period November 15, 1997 - November 14, 1998

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