The effect of toroidal field ripple on confined alphas in TFTR DT plasmas

Duong, H. H.; Fisher, R. K.; Medley, S. S.; Петров, М. П.; Gorelenkov, N. N.; Budny, R.; Mansfield, D. K.; McChesney, J. M.; Parks, P.B.; Roquemore, A. L.; White, R. B.; Zweben, S. J.

doi:10.1088/0029-5515/37/2/i11

Cited by 19 publications

(18 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This signal behavior was used in a study to examine the scaling of the GWB theory (Eq. 7) with the q-profile and energy [88,90]. Over the range of q-profiles variations and alpha energies available in this study, the PCX measured ripple boundary scaled with q and E in a manner consistent with the GWB ripple theory.…”

Section: Monotonic Shear Dischargessupporting

confidence: 64%

“…The alpha particle distributions measured by the PCX diagnostic can be influenced by the effects of classical slowing down and pitch angle scattering, stochastic diffusion associated with toroidal magnetic field ripple [88], and MHD activity [85]. In order to separate the classical behavior from the other effects, PCX measurements were obtained during MHD-quiescent discharges in the plasma core region where stochastic ripple diffusion effects are negligible.…”

Section: Pcx Measurements In Mhd-quiescent Plasmasmentioning

confidence: 99%

See 1 more Smart Citation

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Zweben¹,

Budny²,

Darrow³

et al. 2000

Nucl. Fusion

Self Cite

106

109

View full text Add to dashboard Cite

Alpha particle physics experiments were done on the Tokamak Fusion 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.2

show abstract

Section: Monotonic Shear Dischargessupporting

confidence: 64%

Section: Pcx Measurements In Mhd-quiescent Plasmasmentioning

confidence: 99%

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Zweben¹,

Budny²,

Darrow³

et al. 2000

Nucl. Fusion

Self Cite

106

109

View full text Add to dashboard Cite

show abstract

“…The measured ripple boundary is determined from the major radius at which confined alpha particles are measured by the pellet charge exchange diagnostic. The location of the observed presence of deeply trapped alpha particles is in reasonable accord with a simple estimate of the calculated ripple boundary using the Goldston-White-Boozer formalism (Duong et al, 1996a).…”

Section: Fig 40supporting

confidence: 77%

Results from deuterium-tritium tokamak confinement experiments

Hawryluk¹

1997

View full text Add to dashboard Cite

Recent scientific and technical progress in magnetic fusion experiments has resulted in the achievement of plasma parameters (density and temperature) which enabled the production of significant bursts of fusion power from deuterium-tritium fuels and the first studies of the physics of burning plasmas. The key scientific issues in the reacting plasma core are plasma confinement, magnetohydrodynamic (MHD) stability, and the confinement and loss of energetic fusion products from the reacting fuel ions. Progress in the development of regimes of operation which have both good confinement and are MHD stable have enabled a broad study of burning plasma physics issues. A review of the technical and scientific results from the deuterium-tritium experiments on the Joint European Torus (JET) and the Tokamak Fusion Test Reactor (TFTR) is given with particular emphasis on alpha-particle physics issues. DISCLAIMER This report was prepared as an account of work spansored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or respnsi-. bility for the accuracy, completeness, or usefulness of any information, apparatus, p r d u n , or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document.

show abstract

“…Because the field coils are discrete, the toroidal field in a tokamak is periodically corrugated or 'rippled'; the perturbation has a large toroidal mode number (typically n = 16-24) and a vertically symmetric poloidal perturbation (predominately m = 1). There have been numerous studies of the effect of toroidal field ripple on energetic ion confinement [1,[13][14][15][16][17][18][19]. Another extensively studied perturbation is the helical field that is resonant in the tokamak edge plasma (such as an n = 2, m = 7 perturbation (Ref.…”

Section: Introductionmentioning

confidence: 99%