Experiments on TFTR supershot plasmas

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

doi:10.1016/S0022-3115(06)80008-5

Experiments on TFTR supershot plasmas

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

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Abstract

Improvements to the TFTR limiter have extended the threshold for carbon blooms (an uncontrolled massive influx of carbon) to greater than 32 MW for 1 s so that blooms seldom occur in present TFTR supershot experiments. As a result of the progression from strong blooms to modest blooms to no blooms, improvements in confinement could be correlated with the occurrence of a carbon bloom in the plasma which immediately preceded the supershot. It is speculated that the carbon influx during a carbon bloom results in a limiter surface which has a slightly reduced self-sputtering yield for the subsequent discharge. The influence on the supershot plasma seems similar to phenomena obtained by conditioning with lithium pellets.

Original language	English (US)
Pages (from-to)	28-34
Number of pages	7
Journal	Journal of Nuclear Materials
Volume	196-198
Issue number	C
DOIs	https://doi.org/10.1016/S0022-3115(06)80008-5
State	Published - Dec 1 1992

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

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10.1016/S0022-3115(06)80008-5

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title = "Experiments on TFTR supershot plasmas",

abstract = "Improvements to the TFTR limiter have extended the threshold for carbon blooms (an uncontrolled massive influx of carbon) to greater than 32 MW for 1 s so that blooms seldom occur in present TFTR supershot experiments. As a result of the progression from strong blooms to modest blooms to no blooms, improvements in confinement could be correlated with the occurrence of a carbon bloom in the plasma which immediately preceded the supershot. It is speculated that the carbon influx during a carbon bloom results in a limiter surface which has a slightly reduced self-sputtering yield for the subsequent discharge. The influence on the supershot plasma seems similar to phenomena obtained by conditioning with lithium pellets.",

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T1 - Experiments on TFTR supershot plasmas

AU - Strachan, J. D.

AU - Bell, M.

AU - Janos, A.

AU - Kaye, S.

AU - Kilpatrick, S.

AU - Manos, D.

AU - Mansfield, D.

AU - Mueller, D.

AU - Owens, K.

AU - Pitcher, C. S.

AU - Snipes, J.

AU - Timberlake, J.

PY - 1992/12/1

Y1 - 1992/12/1

N2 - Improvements to the TFTR limiter have extended the threshold for carbon blooms (an uncontrolled massive influx of carbon) to greater than 32 MW for 1 s so that blooms seldom occur in present TFTR supershot experiments. As a result of the progression from strong blooms to modest blooms to no blooms, improvements in confinement could be correlated with the occurrence of a carbon bloom in the plasma which immediately preceded the supershot. It is speculated that the carbon influx during a carbon bloom results in a limiter surface which has a slightly reduced self-sputtering yield for the subsequent discharge. The influence on the supershot plasma seems similar to phenomena obtained by conditioning with lithium pellets.

AB - Improvements to the TFTR limiter have extended the threshold for carbon blooms (an uncontrolled massive influx of carbon) to greater than 32 MW for 1 s so that blooms seldom occur in present TFTR supershot experiments. As a result of the progression from strong blooms to modest blooms to no blooms, improvements in confinement could be correlated with the occurrence of a carbon bloom in the plasma which immediately preceded the supershot. It is speculated that the carbon influx during a carbon bloom results in a limiter surface which has a slightly reduced self-sputtering yield for the subsequent discharge. The influence on the supershot plasma seems similar to phenomena obtained by conditioning with lithium pellets.

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Experiments on TFTR supershot plasmas

Abstract

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