SlimCS; Compact low aspect ratio DEMO reactor with reduced-size central solenoid

Tobita, Kenji; Nishio, Satoshi; Sato, Masayasu; Sakurai, Shinji; Hayashi, Takao; Shibama, Yusuke; Isono, Takaaki; Enoeda, Mikio; Nakamura, Hirofumi; Sato, Satoshi; Ezato, Koichiro; Hayashi, Takumi; Hirose, Takanori; Ide, Shunsuke; Inoue, Takashi; Kamada, Yutaka; Kawamura, Yoshinori; Kawashima, Hisato; Koizumi, Norikiyo; Kurita, Genichi; Nakamura, Yukiharu; Mori, Kensuke; Nishitani, Takeo; Omori, Junji; Oyama, Naoyuki; Sakamoto, Keishi; Suzuki, Satoshi; Suzuki, Takahiro; Tanigawa, Hiroyasu; Tsuchiya, Kunihiko ; Tsuru, Daigo

The concept for a compact DEMO reactor named "SlimCS" is presented. Distinctive features of the concept is low aspect ratio ( = 2.6) and use of a reduced-size center solenoid (CS) which has a function of plasma shaping rather than poloidal flux supply. The reduced-size CS enables us to introduce a thin toroidal field (TF) coil system which contributes to reducing the weight and construction cost of the reactor. SlimCS is as compact as advanced commercial reactor designs such as ARIES-RS and produces 1 GWe in spite of moderate requirements for plasma parameters. Merits of low-, i.e. vertical stability for high elongation and high beta limit are responsible for such reasonable physics requirements.