Journal
PLASMA SCIENCE & TECHNOLOGY
Volume 15, Issue 3, Pages 244-251Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1009-0630/15/3/11
Keywords
spherical torus; partial solenoids; double null merging start-up
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Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [0620-20120004]
- second phase of the Brain Korea 21 Program
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A new spherical torus called VEST (Versatile Experiment Spherical Torus) is designed, constructed and successfully commissioned at Seoul National University. A unique design feature of the VEST is two partial solenoid coils installed at both vertical ends of a center stack, which can provide sufficient magnetic fluxes to initiate tokamak plasmas while keeping a low aspect ratio configuration in the central region. According to initial double null merging start-up scenario using the partial solenoid coils, appropriate power supplies for driving a toroidal field coil, outer poloidal field coils, and the partial solenoid coils are fabricated and successfully commissioned. For reliable start-up, a pre-ionization system with two cost-effective homemade magnetron power supplies is also prepared. In addition, magnetic and spectroscopic diagnostics with appropriate data acquisition and control systems are well prepared for initial operation of the device. The VEST is ready for tokamak plasma operation by completing and commissioning most of the designed components.
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