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Present status and research plan of the SUNIST spherical tokamak* Zhe Gao, 1 Yexi He, 1 Yi Tan, 1 Wenhao Wang, 1 Huiqiao Xie, 1 Lifeng Xie, 1 Long Zeng, 1 Liang Zhang, 1 Chunhuan Feng, 2 Long Wang 2 and Xuanzong Yang 2 1 Department of Engineering Physics, Tsinghua University, Beijing, China 2 Institute of Physics, Chinese Academic of Science, Beijing, China Electronic mail: gaozhe@mail.tsinghua.edu.cngaozhe@mail.tsinghua.edu.cn * This work is supported by the Major State Basic Research Development Program from MOST of China under Grant No. 2008CB717804, NSFC under Grant No. 10535020, as well as the Foundation for the Author of National Excellent Doctoral Dissertation of PR China under Grant No. 200456. 4 th IAEA TCM on ST and 14 th ISTW Frascati, October 7-10, 2008 1 Slide 2 In memory of Professor Yexi He 2 Slide 3 OUTLINES Progress of ECR startup Plan and progress of Alfven wave current drive Upgrade plan of the device and present status 3 Slide 4 Experimental system for ECR startup Microwave injection Turbo pump Cryogenic pump Fast camera ( Upgrade of power supply Improvement of control of equilibrium field (a set of capacitor bank with 1200V 270mF, IGBT-based control scheme) rf power: 400kW/40kW/>5GHz/>30ms (Previously Existed; Now ready; budget ready; in application) 18 Slide 19 Modification of vacuum chamber A new manhole window is opened for convenience of in-vessel components installing and servicing 19 Slide 20 Status of the machine Mission: to install AW antenna and new magnetic probe system, and to open a new manhole window in vessel Before March 27, 2008 Disassembled April 17, 2008 Fabrication May 26, 2008 Cleaning Sep 11, 2008 Vessel reassembled and start of leak detection Sep. 25, 2008 expected to be re- assembled before November this year 20 Slide 21 Summary ECR startup improved and analyzed, but limited by poor diagnostics and microwave power (low freq. and short pulse) AWCD experiment system is preliminarily setuped, but lack of experiences Diagnostic system and power-supply system will be upgraded in a few years 21 Slide 22 potential areas of collaboration Any comment is welcome and any help or collaboration is desirable, typically in Design/improvement of antenna system using more realistic model Antenna shielding and density control in future AW experiments The coupling of rf to plasmas Diagnostic of wave-particle interaction Theory and simulation of the behaviors of the plasma with ECR/AW injection 22