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First EC-DC on HT-7

First EC-DC on HT-7. X. GAO, Y. W. YU, Y. YANG May 1, 2007. Outline. Investigation Parameters Procedure Diagnostics Prospect. Investigation.

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First EC-DC on HT-7

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  1. First EC-DC on HT-7 X. GAO, Y. W. YU, Y. YANG May 1, 2007

  2. Outline • Investigation • Parameters • Procedure • Diagnostics • Prospect

  3. Investigation • ECRF (Electron Cyclotron Range of Frequencies) may be used for heating, non-inductive current drive, start-up and burn-though, plasma control, and wall conditioning. • The reference process for wall conditioning involves … and EC-DC or IC-DC (see below) with toroidal field using D2 and He. －ITER Technical Basis (PDD2-7)

  4. Investigation B∅=B0R0/R ω=neB∅/me Radial plasma density profile, ne ~ zero at R < Rresonance; nearly constant density ~ 1016m-3 at R > Rresonance. ion flux or “plasma loss” is distributed over a very large area of the wall at R > Rresonance. --Alcator C-Mod Mini-Proposal

  5. Investigation • C-Mod: • localize B film growth to • a) produce thicker B films on the outer divertor shelf for a given duration of ECDC • b) avoid B film growth in the antennae. • in-situ tile conditioning and surface heating --Alcator C-Mod Mini-Proposal (2007)

  6. Investigation • TRIAM-1M • the wall conditioned by only ECR-DC is good in both OH and LHCD plasmas. • ECR-DC has no problems with thermal insulation and is suitable for operation in a steady magnetic field. --Wall conditioning using 2.45 GHz ECR-DC on superconducting tokamak TRIAM-1M

  7. Parameters • Parameters (HT-7 Apr. 30, 2007): • Working Gas Species: Helium • Toroidal Field: ~0.09 T(~200A) • Vertical Field: No • Pressure: 1.3E-2 Pa • RF Power: 10 KW, 8 KW • Diagnostics • QMS（王厚银） • OMA（符佳、王光祺）

  8. Procedure（一） • 内真空室用＃1机组分子泵，其他全部关闭 • 设定充气压强1.3E-3 Pa，冲入氦气 • 投入LHW10 KW • 等离子体点亮并持续10分钟

  9. Procedure（二） • 保持其他参数不变，降低LHW功率至8 KW • 等离子体点亮 • 持续9分钟后因LHW电源故障停止

  10. Diagnostics-Video • 等离子体被点亮 • 等离子体位于低场侧 HFS LFS Side view Top view

  11. Diagnostics -QMS 10 KW 8 KW 清洗效果不明显

  12. Diagnostics -QMS 真空室内气体成分前后比较

  13. Diagnostics-OMA

  14. Diagnostics-OMA 在硼化过程中出现了明显的H峰，而ECRH中的H峰不明显

  15. Preliminary results • 实现了LHW D.C. • 用于清洗的参数有待优化 • 观察到有利于硼化控制的局域化的等离子体

  16. Prospect • 清洗 • 改变纵场强度 • 调整气压 • 加入垂直场 • 硼化 • 尝试用于硼化

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