1. 磁约束装置 等离子体与壁的相互作用 (II) 李建刚 2005/04

2. 目前该领域的前沿问题 Understanding the effect of ELMs/disruptions on divertor and first wall structures, Tritium retention & the processes that determine it, Improve understanding of SOL plasma interaction with the main chamber, Better prescription of perpendicular transport coefficients and boundary conditions for input to BPX modeling. Medium-Term SOL transport (parallel and drift) & influence on C transport, High-Z materials - operational experience, Improve our understanding of processes that determine the core impurity level, The impact of the simultaneous use of different materials (e.g. tritium retention).

3. PSI: High Priority Research Areas: recommendations for 2004/2005 Fueling comparison across machines Material migration emphasis on C13 injection experiments and flow measurements Role of divertor geometry in affecting performance (exp’t and theory) Dust Model of movement + summary of existing knowledge Tritium removal update primarily on flash lamp results, new results on T codeposition on tile sides HT-7 ASIPP

4. Tore-Supra 近年的研究前沿和重点

5. Urge for ITER TS assets D retention D recovery Laser/flashlamp, O baking/glows, disruptions C migration Chemical erosion, transport, redeposition, dust Conditionning RF, boronisation W PFCs HHF components, melting, mixed materials C PFCs Cycling studies, acceptance criteria SOL transport and turbulence Anomalous perp., parallel flows Wave/SOL coupling Ripple physics Disruptions Heat loads, time scale, mitigation Fuelling Next stage : put priorities on the different topics for instance on the graph below (not done yet on this page !)

6. ASIPP D in-vessel inventory under long pulse Why no wall saturation?

8. 稳态运行下的重要问题 氢的分布、滞留，特别是在壁饱和条件 下的行为； 再循环的作用、对高约束性能的影响、 控制； 杂质对长脉冲特别是高约束等离子体的 影响； 第一壁材料的腐蚀及再沉积； 材料的辐照损伤。

9. 下一代聚变装置中等离子体与表 面的相互作用 在下一代装置中（像 ITER ）的运行条件 和环境：放电脉冲时间和工作循环比起 目前的聚变装置将大大延长，高热负荷 以及更为强烈的等离子体破裂。

10. 1)High energy content (several hundreds MJ vs. few MJ in current device) and power flow More intense disruptions and disruption-related damage effects;More intense disruptions and disruption-related damage effects; Require an effective reliable way to disperse the power to the divertor surfaces.Require an effective reliable way to disperse the power to the divertor surfaces. 2)Long pulse duration (few hundreds s vs. fews in current devices) require active cooling of PFCs and vessel structure and technique to pumping He ash ; require active cooling of PFCs and vessel structure and technique to pumping He ash ; Require effective control of plasma purity and PMIs to achieve high plasma performance.Require effective control of plasma purity and PMIs to achieve high plasma performance. 3)High duty factor (3% ～ 10%) or pulse repetition rate Short time for wall conditioning and tritium recovery from co-deposited films;Short time for wall conditioning and tritium recovery from co-deposited films; Remote maintenance with acceptable shot-down times.Remote maintenance with acceptable shot-down times. 4)Long cumulative run time The erosion lifetime (needs to be replaced several times);The erosion lifetime (needs to be replaced several times); Tritium retention and dust (safety problems);Tritium retention and dust (safety problems); Neutron damages effects in the bulk surrounding materials and structures;Neutron damages effects in the bulk surrounding materials and structures; PFM surfaces will be modified by mixing effects;PFM surfaces will be modified by mixing effects; 5)Routine operation with large amount of tritium; 6)Superconducting magnet technology; 7)Fast remote maintenance for repair/ refurbishment of the in-vessel components and some of ex-vessel components; 8) Safety: 未来聚变装置的主要特征和相关的 PMI 问题

11. 思考题 为什么要清除器壁中的氧，有哪些方 法？ 碳材料作为第一壁材料的主要优缺点 是什么？ 对长脉冲放电（ 1 分钟到数小时）状 态，最主要的 PWI 是什么，如何解决？