Concept definition of vacuum system for loop operation of large helical device.
Vacuum, 47 (1996) 1001-1004
A. Miyaharaa, N. Nodab, K. Akaishib, T. Kawamurab, K.-N. Satob, Y. Murakamic, K. Watanabed, G. Horikoshie, G. Tominagaf
a School of Economics, Teikyo University, Hachioji 192-03, Japan
b National Institute for Fusion Science, Nagoya 464-01, Japan
c Naka Fusion Research Establishment, JAERI, Ibaraki 311-01, Japan
d Hydrogen Isotope Research Center, Toyama University, Toyama 930, Japan
e National Laboratory for High Energy Physics, Tukuba 305, Japan
f Faculty of Science, Toho University, Funahashi 274, Japan
Abstract
As the Large Helical Device (LHD), which is under construction at the National Institute for Fusion Science, is installed in a super conducting magnet as confinement magnetic field, it is capable of operating in a steady state loop operation, if proper particle controls of both upstream (plasma region) and downstream (exhaust, impurity removal, H-isotope separation and refueling) are achieved. In the following, not only is the concept of the steady state loop operation described but also several hardware developments to meet this requirement are discussed.
Keywords: Fusion research; helical device; particle balance; loop operation; vacuum system