HL-1M装置硼化、硅化和锂涂覆壁的出气特性

OUTGASSING PERFORMANCE UNDER DIFFERENT WALLCONDITIONSBORONIZATION、 SILICONIZATION ANDLITHIUM COATING IN THE HL1M TOKAMAK

借助ＱＭＳ诊断技术，完成了ＨＬ－１Ｍ装置Ｂ化、Ｓｉ化和Ｌｉ涂覆壁的出气特性的对比实验研究。氦直流辉光放电清洗［ＧＤＣ（Ｈｅ）］期间，Ｈ２出气占支配地位，杂质分压与Ｈ２分压成正比，ＧＤＣ后的本底放气率较烘烤去气低。ＧＤＣ（Ｈｅ＋Ｈ２）是去除膜的有效方法。对应Ｂ化、Ｓｉ化和Ｌｉ涂覆壁，托卡马克放电后的Ｈ２出气量比是１∶０．１３∶０．２１。出Ｈ２量／送Ｈ２量对ＳＳ壁为０．５，对Ｂ化壁为１．８，对Ｓｉ化和Ｌｉ涂覆壁则为０．１。对ｎｅ归一化的出气量的Ｈ密度能有效地表示再循环系数（Ｒ）的大小。

utgassing investigations under boronization,siliconization and lithium coating of the first wall of the HL1M tokamak have been performed by means of QMS diagnostic technique. During glow discharge cleaning with He contained ,H2 outgassing is dominant. The impurity partial pressures are approximately proportional to the H2 partial pressures. With the same conditioning time, reduction of the background outgassing rates by GDC is more than that of bakeout outgassing and GDC(He+H2) discharge is a effective process for removing the films unwanted . After tokamak discharges, the ratio of H2 outgassing amounts of B wall to those of Si and Li walls is 1∶0.13∶0.21. And outgassing amounts/gas puffing amounts of H2 are about 0.5, 1.8 and 0.1 for SS , B and Si contained wall, respectively. The H density associated with the H2 outgassing amounts normalized by ne is a significant indication of the recyclling factor R.