Premium
Investigation of the optimum parameters for a helical heliac
Author(s) -
Osabe Yukihide,
Kogoshi Sumio,
Maeda Joji,
Katsurai Makoto,
Yamada Hiroshi,
Sato Kohnosuke
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(200002)130:3<1::aid-eej1>3.0.co;2-i
Subject(s) - electromagnetic coil , limit (mathematics) , toroid , large helical device , physics , materials science , plasma , mathematics , mathematical analysis , quantum mechanics
An L = 2 helical heliac is a newly proposed helical‐axis configuration of heliac type in which toroidal coils and a center conductor are replaced by L = 2 helical coils with a double helix. The Shafranov shift of the magnetic axis in an L = 2 helical heliac is suppressed as the helical displacement of a helical coil axis (HDCA) increases because of the increase in the rotational transforms. This suggests that the equilibrium beta limit is large for an L = 2 helical heliac with a large HDCA. An L = 2 helical heliac with a larger HDCA, however, has no magnetic well, a larger magnetic ripple, and a smaller outermost surface. No magnetic well means that the stability beta limit of an L = 2 helical heliac with a large HDCA is low because the magnetic shear of an L = 2 helical heliac is not so large. The optimum coil parameter set of an L = 2 helical heliac is presented from the standpoint of the equilibrium and stability beta limit. © 1999 Scripta Technica, Electr Eng Jpn, 130(3): 1–8, 2000