[1] KYOTO UNIV,INST ATOM ENERGY,UJI,KYOTO 611,JAPAN
[2] UNIV TEXAS,INST FUS STUDIES,AUSTIN,TX 78712
[3] NIIGATA UNIV,DEPT PHYS,NIIGATA 95021,JAPAN
[4] HIMEJI INST TECHNOL,DEPT ELECT,HIMEJI,HYOGO 67122,JAPAN
[5] OSAKA UNIV,PLASMA PHYS LAB,SUITA,OSAKA 565,JAPAN
[6] UNIV ILLINOIS,DEPT NUCL ENGN,FUS STUDIES LAB,URBANA,IL 61801