7月1日 Shattered pellet technology development at the ITER Disruption Mitigation Support Laboratory

　　题目：Shattered pellet technology development at the ITER Disruption Mitigation Support Laboratory

　　时间：7月1日 上午9点-11点30分

　　地点：4号楼601会议室

　　主持人：刘海庆研究员

　　摘要：Disruptions are a major threat to machine safety on large tokamak experiments. On ITER uncontrolled disruptions could thermally overload the first wall, generate excessive forces and produce multi-MA runaway beams. To reduce the risk ITER plans to use Shattered Pellet Injection (SPI) as Disruption Mitigation System (DMS). This technology uses fast cryogenic pellets shattered just before entering the plasma, so as the fragments can introduce large amounts of material into the plasma in a short time. Although SPI is being tested on existing tokamak experiments, the pellet sizes to be used on ITER are much larger and requirements are different from present-day devices. Therefore, ITER started a technology development program. In this the most comprehensive laboratory is the DMS Support Laboratory located at the HUN-REN Centre for Energy Research (CER), Budapest, Hungary. The injector and launch system built in this laboratory successfully demonstrated up to 28.5 x 55 mm size cryogenic protium, deuterium, neon and mixture pellets, studied shattering, developed an optical diagnostic, pellet launch gas valves and fast shutter. The presentation will describe the developed special pellet recipes, modelling of the desublimation process and technological elements developed at the laboratory. An overview will also be given of the EU DEMO cryogenic pellet injector development and related studies at CER.

　　报告人介绍：Sandor Zoletnik has 40 years experience in fusion research. His focus is on diagnostic development, plasma turbulence measurements and pellet technology, built diagnostics and done research on most major fusion facilities worldwide. Currently he is the head of the Fusion Plasma Physics Department at the HUN-REN Centre for Energy Research, Budapest, Hungary, and chair of the Diagnostics Topical Group of the International Tokamak Physics Activity.