Analysis of outgassing after Joint European Torus discharges under beryllium first wall conditions
Analysis of outgassing after Joint European Torus discharges under beryllium first wall conditions
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铍第一壁条件下欧洲联合环面放电后的脱气分析
DOI：
10.1116/1.578750
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
J. Ehrenberg
中科院分区：
文献类型：
--
作者：
V. Philipps;J. Ehrenberg
在欧洲联合环形加速器的铍阶段，利用质谱法和潘宁规对放电后的氢（H₂、HD、D₂）、碳氢化合物（CₓHᵧ）以及一氧化碳的脱气现象进行了分析。这种分析是在欧姆放电以及附加加热的限制器和X点放电之后的长达3000秒的时间段内进行的。研究发现，氢脱气的时间特性可以用统一的幂律t⁻ⁿ来表征，其中n = 0.73 ± 0.1，且与等离子体运行参数无关。鉴于等离子体面向表面可能的输运和滞留机制以及氘的释放机制，对这一结果进行了讨论。结论是，不是单一的机制，而是多种机制可以解释这种释放行为。然而，最合理的解释之一是氢在限制器和壁中的积累。与早期的全碳壁条件相比，在铍壁条件下碳氢化合物和一氧化碳的脱气现象明显更低。
During the beryllium phase of the Joint European Torus, hydrogen (H2, HD, D2), hydrocarbon (CxHy), and CO outgassing after discharges has been analyzed by means of mass spectroscopy and penning gauges. This analysis has been performed over a period of up to 3000 s after ohmic and additionally heated limiter and X‐point discharges. It has been found that the temporal behavior of hydrogenic outgassing could be characterized by a uniform power law t−n with n=0.73±0.1 which is independent of plasma operation parameters. This result is discussed in view of possible transport and retention mechanism in and deuterium release mechanism from plasma facing surfaces. It is concluded that not a single, but several mechanism can explain the release behavior. However, one of the most plausible explanations is accumulation of hydrogen in limiters and walls. Outgassing of hydrocarbon and CO were significantly lower under beryllium wall conditions as compared to the earlier all carbon wall conditions.