Flow and Heat Transfer Simulations for ITER’s ECH
June 13, 2013 — The ITER Electron Cyclotron Heating (ECH) system will produce a high-intensity beam of electromagnetic radiation for plasma heating. A total of 20 MW of power will be transferred from 170 GHz gyrotrons through multiple transmission lines. The transmission lines consist of evacuated, aluminum, circularly corrugated waveguides that will each transmit a maximum of 2 MW for up to 3000 seconds. The waveguides, with straight lengths up to 28 meters, as well as mirror, polarizer, power monitor, and arc detector components, will be actively water cooled in order to be able to support the heat load from the long-pulse high-power radiation.
Massive Gas Injection scheme for ITER’s DMS
June 13, 2013 — ITER needs a reliable fast acting tool to mitigate the possible sudden unplanned terminations of the plasma that could damage the plasma chamber from thermal loads, high magnetic forces, and runaway electrons. The Disruption Mitigation System (DMS) consists of injecting a large quantities of mass into the plasma. The massive gas injection (MGI) is investigated here.
Flow and Heat Transfer Simulations for ITER’s CVC
June 13, 2013 — ITER has unique vacuum pumping requirements due to high throughput tritium operation. The roughing system cannot use conventional pumps; therefore a cryopump (CVC) is developed at ORNL to effectively pump the hydrogenic species, while allowing helium impurities to be exhausted to atmosphere. A single tube prototype was built and a full prototype is in progress.