Thermal desorption of helium from graphite irradiated by He+ ions

Atsumi, H.; Tokura, Shigeru; Yamauchi, Tomoya; Yamanaka, Shinşuke; Miyake, Masanobu

doi:10.1016/s0022-3115(86)80047-2

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1988

1992

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Cited by 19 publications

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“…initially He occupies interstitial sites of high mobility, but that progressive bombardment permits the formation of vacancy clusters or interstitial dislocation loops having higher binding energy (0.9 eV up from 0.7 eV at low fluence) and greater concentration of He. [11] This second type of trap appears to saturate at a fluence of _pproxirnetely 5 × 1017 cm 2, depending somewhat on the impinging energy. The amount of retained He in those studies varied from 12% to 22% depending on the original morphology of the samples.…”

Section: Discussionmentioning

confidence: 98%

Noble gas pumping by the TFTR graphite limiter

Ramsey¹,

Manos²

1992

Journal of Nuclear Materials

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The TFTR limiter is graphite, lt is possible to decrease the amouut of D trapped in the limiter by making plasma discharges with gas injected only as a prefill. When the limiter is deuterium depleted well enough by this technique for supershots (with RD~0.5-0.6) it pumps noble gases. The effective confinement time Xp* ranges from < 1 s for He down to 0.08 s for Kr. These noble gases escape from the limi[er slowly after the run. The partial pressure of Ar and Ne decay with time-constants of several hours, and the data fbr Ar show evidence of two trapping sites. .,

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Section: Discussionmentioning

confidence: 98%