Experiments on TFTR supershot plasmas

Strachan, J D; Bell, M; Janos, A; Kaye, S; Kilpatrick, S; Manos, D; Mansfield, D; Mueller, D; Owens, K; Timberlake, J.; Pitcher, C. S.; Snipes, J. A.

doi:10.2172/5588394

Cited by 2 publications

(4 citation statements)

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“…Since minimizing the hydrogenic influx can dramatically increase the plasma performance 4,5 it is clearly important to identify its dependence on plasma parameters. A dedicated experimental investigation of the parametric dependence of F 1 on plasma parameters would have required prohibitively high tritium usage, and so a study was undertaken of discharges in the existing database.…”

Section: Scaling Of Neutron Rate With Plasma Parametersmentioning

confidence: 99%

“…The TFTR plasma boundary is defined by an inner toroidal belt limiter composed of 22 m 2 of carbon tiles. The deuterium influx from the limiter was minimized by ohmic conditioning discharges 4 and in some cases by lithium pellet injection. 5 However, despite the substantial reductions achieved, recycling from the limiter remained a major fueling source for the plasma (typically, there is no gas feed after the initiation of the discharge).…”

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confidence: 99%

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Transport of Recycled Deuterium to the Plasma Core in TFTR

Bell¹,

Budny²,

Jassby³

et al. 1997

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We report a study of the fueling of the plasma core by recycling in the Tokamak Fusion Test Reactor (TFTR) [Phys. Plasmas 2, 2176 (1995)]. We have analyzed discharges fueled by deuterium recycled from the limiter and tritium-only neutral beam injection. In these plasmas, the DT neutron rate provides a measure of the deuterium influx into the core plasma. We find a reduced influx with plasmas using lithium pellet conditioning and with plasmas of reduced major (and minor) radius. Modeling with the DEGAS neutrals code shows that the dependence on radius can be related to the penetration of neutrals through the scrape-off layer.

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Section: Scaling Of Neutron Rate With Plasma Parametersmentioning

confidence: 99%

mentioning

confidence: 99%

Transport of Recycled Deuterium to the Plasma Core in TFTR

Bell¹,

Budny²,

Jassby³

et al. 1997

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“…The majority of experiments with D-T discharges in TFTR have been carried out in the "supershot" mode of plasma operation. The enhanced energy confinement, peaked density profiles and high fusion reactivity that characterize supershots are known to depend sensitively on the surface condition of the TFTR carbon inner limiter [ 6 ] . Moreover, it has been demonstrated that, in D-only supershots, energy confinement can be improved by depositing lithium (Li) onto the limiter [7,8,9,10].…”

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confidence: 99%

“…Although all the mechanisms by which Li conditioning contributes to plasma performance are not understood, reduced particle (mostly carbon and deuterium) influx from the limiter during NBI appears to play an important role in determining energy confinement in TFTR supershots [6,18]. In this regard, a clear result of Li conditioning can be seen on the edge electron density.…”

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confidence: 99%