Determination of q=1 surface by the variation of pellet ablation rate on the HL-1M

• 来源期刊: 中国物理（英文版）
• 关键词: q=1 surface pellet Hα emission ablation rate
• 年，卷（期）: 2004,（3）
• 页码范围: 379-383
• 页数: 5页
• 语种: 英文

摘要

Strong drop of Hα emission has been observed on the HL-1M tokamak by means of a detector array while a pellet crosses the q=1 surface. In this article, the q=1 surface has been determined precisely by the interval and the shape of the Hα emission striations on the pellet trajectory due to the variation of pellet ablation rate. The q-profile and current density distribution at the plasma centre region have been calculated according to the pellet ablation rate and the magnetic shear feature.