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A rectangular pulse vertical field circuit for a small tokamak
Author(s) -
Mizuno Yasunori,
Yamane Naoto,
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 - 10.1002/1520-6416(200012)133:4<19::aid-eej3>3.0.co;2-n
Subject(s) - crowbar , plasma , tokamak , pulse duration , pulse (music) , current (fluid) , materials science , electrical engineering , capacitor , physics , optics , voltage , engineering , nuclear physics , laser
A rectangular pulse vertical field circuit of transistor type was devised and assembled as a substitute for the usual crowbar type. The circuit is composed of 10 units, each consisting of a capacitor, a transistor, and a comparator. The current rise time, the maximum field, and the current duration of the circuit are 750 A/ms, 18 G, and 2.5 ms, respectively. When the pulse vertical field of the circuit having a short current fall time is applied to a plasma, the horizontal displacement of the plasma is reduced, the plasma is stably confined around the center of a vacuum vessel, and the duration of the plasma current is elongated. The rapidly rising pulse vertical field can clarify the effect of the vacuum vessel as a thin‐casing shell. © 2000 Scripta Technica, Electr Eng Jpn, 133(4): 19–27, 2000