1990
DOI: 10.1088/0029-5515/30/1/013
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Enhancement of energy confinement by acceleration of fast ions in combined lower hybrid and neutral beam heating on JT-60

Abstract: A strong ion tail with a temperature of ~ 60 keV was produced in JT-60 by lower hybrid wave acceleration of neutral beam injected fast ions. The incremental energy confinement time due to neutral beam heating of a lower hybrid heated plasma was improved by more than a factor of two and reached approximately 110 ms. The confinement of the tail ions is classical and the improvement of confinement can be fully explained by the contribution of the fast ions. The heating process of the beam ions is consistent with … Show more

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Cited by 9 publications
(7 citation statements)
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“…The LH waves were launched into low density plasmas, where changes in k l due t o parametric decay and scattering off fluctuations are minimized. The observed passive charge exchange spectrum agrees (to within ~5 0 % ) with the expected distribution function [177]. When the wave frequency and beam energy are varied, tail formation varies with plasma density as expected (Fig.…”
Section: Lower Hybrid Wavessupporting
confidence: 83%
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“…The LH waves were launched into low density plasmas, where changes in k l due t o parametric decay and scattering off fluctuations are minimized. The observed passive charge exchange spectrum agrees (to within ~5 0 % ) with the expected distribution function [177]. When the wave frequency and beam energy are varied, tail formation varies with plasma density as expected (Fig.…”
Section: Lower Hybrid Wavessupporting
confidence: 83%
“…Both passive channels and an analyser with a crossed beam geometry observe beam acceleration [176], which implies that a.t least some of the energetic ions are located near the plasma centre. The long decay time of the accelerated ions (-200 ms) supports this conclusion as well [177]. Modelling of the data suggests that the largest concentration of accelerated beam ions is a t T / U CY 0.5 [177].…”
Section: " Imentioning
confidence: 61%
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“…Hard-x-ray emission behaved similarly to /ECE(L5&) ce )x« e . During the L phase with NBI, beam acceleration by the LH waves 18 was observed in the neutral flux as shown in Fig. 5(b).…”
mentioning
confidence: 91%