Ripple enhanced banana drift loss at the outboard wall during ICRF/NBI heating in JT-60 U

Ikeda, Yoshitaka; Tobita, K.; Hamamatsu, K.; Ushigusa, K.; Naito, O.; Kimura, H.

doi:10.1088/0029-5515/36/6/i07

Cited by 20 publications

(26 citation statements)

References 12 publications

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“…An IRTV system to detect the alpha heating of the first wall limiters was designed for TFTR, similar to that used for beam ion loss in JT-60U [38], but was not implemented. Finally, a method for foil neutralization of alpha loss was developed [39], but never tried on TFTR.…”

Section: Alpha Particle Diagnostics For Tftrmentioning

confidence: 99%

“…The simplest system would be an infrared imaging system to measure the heat load to the wall, as was done for beam ion and RF tail ion loss in JT-60U [38]. However, this method has no intrinsic species, pitch angle, or energy resolution, and would most likely work only for DT plasmas which have a reasonably high Q ≈ 1.…”

Section: Directions For Future Researchmentioning

confidence: 99%

“…RF-induced loss of fast ions has been observed in several tokamaks: TFTR [148], JT-60U [158,159], Tore Supra [160], and Textor [161]. This arises from RF-induced transport of the alphas in velocity space, typically to more perpendicular velocities, that convects them into an existing loss cone.…”

Section: Historical Background and Previous Workmentioning

confidence: 99%

See 2 more Smart Citations

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Zweben¹,

Budny²,

Darrow³

et al. 2000

Nucl. Fusion

104

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Section: Alpha Particle Diagnostics For Tftrmentioning

confidence: 99%

Section: Directions For Future Researchmentioning

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

104

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“…In high performance supershot discharges, stochastic ripple diffusion was only a couple of percent; however, in reversed shear plasmas, which were located outboard in major radius in a higher toroidal field ripple region, the stochastic ripple diffusion was about 20% [51,52]. Experiments on JT-60U measured the heat deposition due to ripple loss of fast ions to the plasma-facing components using an infrared camera, extending the work on TFTR [53].…”

Section: Confinement and Slowing-down Of Alpha Particles In Mhd Quiesmentioning

confidence: 92%

Review of D-T Experiments Relevant to Burning Plasma Issues

Hawryluk¹

2001

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Progress in the performance of tokamak devices has enabled not only the production of significant bursts of fusion energy from deuterium-tritium (D-T) plasmas in the Tokamak Fusion Test Reactor (TFTR) and the Joint European Torus (JET) but, more importantly, the initial study of the physics of burning magnetically confined plasmas. TFTR and JET, in conjunction with the worldwide fusion effort, have studied a broad range of topics including magnetohydrodynamic stability, transport, wave-particle interactions, the confinement of energetic particles, and plasma boundary interactions. D-T experiments differ in three principal ways from previous experiments: isotope effects associated with the use of deuterium-tritium fuel, the presence of fusion-generated alpha particles, and technology issues associated with tritium handling and increased activation. The effect of deuteriumtritium fuel and the presence of alpha particles is reviewed and placed in the perspective of the much larger worldwide database using deuterium fuel and theoretical understanding.Both devices have contributed substantially to addressing the scientific and technical issues associated with burning plasmas. However, future burning plasma experiments will operate with larger ratios of alpha heating power to auxiliary power and will be able to access additional alpha-particle physics issues. The scientific opportunities for extending our understanding of burning plasmas beyond that provided by current experiments is described.

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“…The information learned in these experiments indicates that redesigned detectors should allow knock-on tail measurements. An IRTV system to detect the alpha heating of the first wall limiters was designed for TFTR, similar to that used for beam ion loss in JT-60U [38], but was not implemented. Finally, a method for foil neutralization of alpha loss was developed [39], but never tried on TFTR.…”

Section: Alpha Particle Diagnostics For Tftrmentioning

confidence: 99%

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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Ripple enhanced banana drift loss at the outboard wall during ICRF/NBI heating in JT-60 U

Cited by 20 publications

References 12 publications

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Review of D-T Experiments Relevant to Burning Plasma Issues

Alpha Particle Physics Experiments in the Tokamak Fusion Test Reactor

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