2023-12-11T05:17:43Z
https://nifs-repository.repo.nii.ac.jp/oai
oai:nifs-repository.repo.nii.ac.jp:00010469
2023-06-20T20:49:36Z
8:32
Roles of Bumpy Field on Collisionless Particle Confinement in Helical-Axis Heliotrons
"Yokoyama, M.
Nakajima, N.
Okamoto, M.
Nakamura, Y.
Wakatani, M."
metadata only access
bumpy field
collisionless particle
mod-B_min contour
helical-axis heliotoron
"Roles of bumpy field on collisionless particle confinement in helica1-axis heliotrons are investigated with the model magnetic field and particle orbit calculations in the Boozer coordinates. The mod-B_min contours can be shifted in the major radius direction with the control of the bumpy field, where B_min is the minimum value of |B| in the toroidal direction within one field period. The area of closed mod-B_min contours is a useful measure to evaluate global collisionless particle confinement as long as the mod-B_min contours connect toroidally. Negative value of ratio between the bumpy and the helicity components contributes to obtain the largest area of closed mod-B_min contours for finite ratio between the toroidicity and the helicity components. The radial variation of the bumpy field attributes to realize a toroidally localized mod-B_min Structure, which is significantly effective to improve collisionless particle confinement."
1999-02-01
eng
research report
http://hdl.handle.net/10655/3043
https://nifs-repository.repo.nii.ac.jp/records/10469
0915-633X
Research Report NIFS-Series