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Feedback position control apparatus of tokamak plasma horizontal position with a digital drive
Author(s) -
Mizuno Yasunori,
Muramatsu Hideki,
Aoki Takamitsu,
Sometani Taro
Publication year - 2000
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(200003)130:4<26::aid-eej4>3.0.co;2-x
Subject(s) - tokamak , plasma , horizontal position representation , waveform , physics , current (fluid) , position (finance) , phase (matter) , control theory (sociology) , displacement (psychology) , electrical engineering , optics , voltage , engineering , mathematics , computer science , geometry , psychology , control (management) , finance , quantum mechanics , artificial intelligence , economics , psychotherapist
A plasma horizontal position feedback control system (PHPFCS) and a digital current drive (DCD) for controlling vertical magnetic field are made on an experimental base, and the horizontal position of a plasma in a small tokamak (HAMANA‐T) is controlled by PID operations from the initial phase of plasma generation. The DCD consists of constant‐current discharge units for multiple condensers and drives a digital current analogous as a whole to the control signal of PHPFCS in the range of ±90 A. The maximum value of the digital current increases in proportion to the number of units. This PHPFCS elongates plasma duration from 1.3 ms to 2.1 ms, smooths the waveform of plasma current, and reduces the plasma loop voltage from 25 V to 20 V. Furthermore, PHPFCS reduces the range of variation in plasma horizontal displacement from 3.5 cm to within 0.5 cm and makes it possible to set accurately the horizontal position from the initial phase in the inner region of a vacuum chamber. © 2000 Scripta Technica, Electr Eng Jpn, 130(4): 26–34, 2000