C. Namba

H. Momota

M. Ishikawa

Y. Tomita

National Institute for Fusion Science (NIFS-Repository)

§20. Basic Study of Direct Energy Conversion for D3He/FRC Fusion Reactors Ishikawa, M. (lnst. Eng. Mech. & Systems, Univ. Tsukuba) Namba, C., Tomita, Y., Momota, H. I. Objectives The objectives are to study direct energy converters applied for D3 He/FRC fusion reactors with numerical analyses, to reveal items to be solved, to carry out preliminary and conceptual designs of the CUSP type DEC and TW type DEC, and to organize international cooperation. The CUSPDEC is supposed to separate the ions and electrons and also convert their kinet ic energy into electrici ty, whereas the TWDEC wi II convert the kinet ic energy of protons produced by the fusion reaction. I I. Cooperative Studies The members of present cooperat ion research program have carr i ed ou t i ndependen t I y the i r own research at their institutes and had intensive discussion at seminars held at NIFS. They also joined the US-Japan workshop and played important roles. 2. 1 Seminar on May 20th Attendees: M. Ishikawa, C. Namba, H. Momota, Y. Tomi ta, Y. Yasaka (Associate Professor of Kyoto Univ. ), and Y. Shimizu (Ms Student of Kyoto Univ.) 2.2 Seminar on July 21st Attendees: M. Ishikawa, C. Namba, H. Momota, Y. Tomita, and Y. Shimizu (Ms Student of Kyoto Univ.) 2.3 US-Japan Workshop on Physics of High-Beta Plasma Confinement in Innovative Fusion on December 14th and 15th Attendees: M. Ishikawa, C. Namba, H. Momota, Y. 334 Tomi ta, Y. Shimizu (Ms Student of Kyoto Univ. ), S. Mima (Ms Student of Kyoto Univ.), and many others III. Results Obtained by the Studies 3. 1 Behavior of CUSPDEC Many sets of magnetic field distribution for CUSPDEC ari compared, which are designed with three-dimensional analyses of magnetic field. Trajectories of deuterium ions and others are obtained with time-dependent two-dimensional calculations which take into account effects of space charge distribution. It is found that the electric field generated by ions has very large effects. 3.2 Behavior of TWDEC We have designed an external electric circuit which can induce the travel I ing wave by the interact ion wi th the ion flow, and developed a time dependent one-dimensional numerical scheme which can simultaneously analyze the external circuit, the ion trajectory, and the potential distribution. We have also developed a time dependent two-dimensional code, and analyzed the behavior of TWDEC with consideration of colI ision of ions wi th grids. It has been found that the collision loss with grids is much larger than the pure two-dimensional losses. 3.3 Publications 1. Ishikawa, M., Kudo, T., Hayashi, S. Yamane, T., Tomita, H. and Momota, H., "Basic Numerical Simulation on TWDEC for a D- 3 He Fusion Reactor", Fusion Engineering and Design 41, (1998) 541 2. Ishikawa, M., Kudo, T., Yamane, T., Hayashi, S., Shimizu, Y., Tomita, Y. and Momota, H., "Loss Estimation of TWDEC for a D- 3 He FRC Fusion Reactor", Workshop on Physics of High Beta Plasma Confinement in Innovative Fusion, (1998) No.6 

Basic Study of Direct Energy Conversion for D3He/FRC Fusion Reactors

Abstract

Similar works

Full text

Available Versions

National Institute for Fusion Science (NIFS-Repository)