NIFS-644

FULL TEXT (PDF, 562 KB)


Author(s):

Fujisawa, A., Iguchi, H., Minami, T., Yoshimura, Y., Sanuki, H., Itoh, K., Isobe, M., Nishimura, S., Tanaka, K., Osakabe, M., Nomura, I., Ida, K., Okamura, S., Toi, K., Kado, S., Akiyama, R., Shimizu, A., Takahashi, C., Kojima, M., Matsuoka, K., Hamada, Y., Fujiwara, M.

Title:

Observation of Bifurcation Property of Radial Electric Field Using a Heavy Ion Beam Probe

Date of publication:

Sep. 2000

Key words:

IAEA, fusion energy conference, Sorrento

Abstract:

Bifurcation nature of potential profile of a toroidal helical plasma is investigated in the Compact Helical System (CHS), using a heavy ion beam probe. The measurements reveal that there exist three main branches of potential profiles in electron cyclotron resonance (ECR) heated plasmas with low density of n_e~0.5 x l0^13 cm^-3. The branches with higher central potential exhibit a rather strong radial electric field shear that should result in fluctuation reduction and formation of transport barrier. Lissajous expression is useful to extract the bifurcation characteristics of potential structure.

List of NIFS Report (2000)Return toContents Page Return toNIFS Homepage
footer
 National Institute for Fusion Science
Copyright: 1995-2007 National Institute for Fusion Science (NIFS)
Address: 322-6,Oroshi-cho, Toki, GIFU, 509-5292, Japan
Telephone:+81-572-58-2222