Speaker
Yang Qing Xi
(Institute of Plasma Physics)
Description
Abstract: Wave heating in the Ion cyclotron range of Frequencies (ICRF) has been a method of choice for plasma heating in fusion research because of its flexibility, cost effectiveness and plug-to-power efficiency. A new three-strap ICRF antenna, designed for ASDEX Upgrade, and aiming to lower RF sheath by preventing undesirable currents induced in the antenna frame, demonstrated experimentally to reduce the impurity production. It will be one of the potential and promising solutions applicable to fusion reactor. The ICRF antenna fabrication is a project to undertaken in CAS/ASIPP as one part of the international cooperation agreements, conducted jointly by IPP (Garching, Germany) and ASIPP (Hefei, China). ENEA (Italy) also fabricated components of the antenna. Based on the high requirements for the antenna, the material choice including filler material, the welding method, the measurement & inspection and heat treatment and assembly were all carefully considered and rigorously defined before fabrication. Tools of fixtures and jigs, as well as clamps were designed for manufacturing and assembly. Advanced electron beam welding (EBW) was chosen for the antenna components because of high requirements of welding quality and low deformation. Some workpieces and one mockup of central conductor were manufactured for welding test and inspection for welding qualification. In addition, heat treatment was employed to release heat stress after welding.
This paper is mainly focused on the fabrication of the ASDEX Upgrade ICRF antenna components made in the framework of the CAS/ASIPP project. Based on the high accuracy required for the ICRF components, machining process is introduced, following by welding, qualification tests, assembly, scanning, measurement and metrological analysis.
Keywords：ASDEX-Upgrade, ICRH, fabrication
Co-authors
Song Yun Tao
(Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China)
Wang Yong Sheng
(Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China)
Yang Qing Xi
(Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China)
Zhao Yan Ping
(Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China)
