1990
DOI: 10.1103/physrevlett.65.2382
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Helium exhaust and transport studies with the ALT-II pump limiter in the TEXTOR tokamak

Abstract: The first encouraging experiments demonstrating direct, explicit control of the He 2+ density in a tokamak plasma have been performed in the TEXTOR tokamak with the Advanced Limiter Test-II pump limiter. Helium is injected in a short gas puff from the outside of the plasma, is observed to reach the plasma core, and then is readily removed from the plasma. An exhaust efficiency of -8% is obtained. Active charge-exchange spectroscopy is used to study the exhaust and transport of He 2 * within the plasma, and the… Show more

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Cited by 73 publications
(47 citation statements)
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“…These design values of ALT-II are in agreement with the measurements. We have also verified experimentally the expected helium removal efficiency [10]. The removal efficiencies we obtained for TEXTOR would just be sufficient for the requirements of helium removal for a burning reactor.…”
supporting
confidence: 55%
“…These design values of ALT-II are in agreement with the measurements. We have also verified experimentally the expected helium removal efficiency [10]. The removal efficiencies we obtained for TEXTOR would just be sufficient for the requirements of helium removal for a burning reactor.…”
supporting
confidence: 55%
“…Experiments have been performed on the helium distribution in the plasma, the helium transport, and accumulation of helium in the divertor chamber [5][6][7][8][9][10][11][12][13][14]. Investigations with full pumping capabilities have been executed by the toroidal pump limiter ALT-II on TEXTOR [15][16][17][18][19][20]. Also, proposals were carried out to remove the helium by implantation in nickel [21].…”
mentioning
confidence: 99%
“…in 1987, which is a full toroidal belt limiter equipped with turbopumps, efficient He exhaust has been demonstrated for the first time in a tokamak. 5 These studies also led to the derivation of an important figure of merit for He exhaust: The ratio t He * 0t E of the effective helium exhaust time and the energy confinement must stay below a certain maximum value to allow for a steady-state burning fusion plasma. 6 The maximum value depends on the presence and amount of other impurities in the plasma.…”
Section: Main Achievementsmentioning
confidence: 99%