Numerical Investigation of Velocity Map of Outward Electrons Penetrating in Helical Magnetic Surfaces

©2009 by The Japan Society of Plasma Science and Nuclear Fusion Research (Received: 3 September 2008 / Accepted: 5 January 2009) Numeri al Investigation of Velo ity Map of Outward Ele trons Penetrating in Heli al Magneti Surfa es Kazutaka NAKAMURA1), Haruhiko HIMURA1), Mitsutaka ISOBE2), Akio SANPEI1), and Sadao MASAMUNE1) 1)Kyoto Institute of Te hnology, Department of Ele troni s, Matsugasaki, Kyoto 606-8585, Japan 2)National Institute for Fusion S ien e, Gifu 509-5292, Japan In order to investigate the formation pro ess of heli al nonneutral plasmas, we numeri ally perform a mapping of velo ity spa e of outward ele trons whose orbits extend to inward part of losed heli al va uum magneti region of the Compa t Heli al System ma hine. Contrary to the experimental observation, the penetrating ele trons exist in quite narrow region on the velo ity map, whi h are the vi inities of initial pit h angle 90Æ.