Resonant helical divertor experiments in ohmic and auxiliary heated JIPP T-IIU plasmas

Conference · Mon Aug 01 04:00:00 EDT 1988

OSTI ID:6643008

Evans, T E; deGrassie, J S; Garner, H R; Leonard, A W; Ohyabu, N; Peranich, L S; Mohri, A; Hamada, Y; Ida, K; Kaneko, O; Kawahata, K; Kitagawa, S; Kuroda, T; Masai, K; Morita, S; Ogawa, Y; Okamura, S; Sata, K N; Sakamoto, M; Yamada, H ; Yamazaki, K; Watari, T; Karger, F

A series of initial resonant helical divertor (RHD) experiments have been carried out in ohmically and auxiliary heated JIPP T-IIU plasmas. Disruptive and MHD instabilities make the interpretation of the RHD results difficult but an apparent increase in the energy confinement time is observed when the helical magnetic perturbation is applied. This may be due to the suppression of MHD activity or to a reduction in the edge convective heat losses. Magnetic island effects have been observed on the floating potential of a Langmuir probe array and energy scrape off layer widths have been measured with and without helical perturbations during ICRF operation. Basic pump limiter data are presented including ion temperatures and C/sup +4/ impurity profiles. Energy confinement times are reported in ohmically and NBI heated discharges. 5 refs., 7 figs.

• Research Organization: General Atomics Co., San Diego, CA (USA); Nagoya Univ. (Japan). Inst. of Plasma Physics; Max-Planck-Institut fuer Plasmaphysik, Garching (Germany, F.R.)
• DOE Contract Number: AC03-84ER51044
• OSTI ID: 6643008
• Report Number(s): GA-A-19297; CONF-880512-16; ON: DE88016519
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
CONFINEMENT TIME
DIVERTORS
ELECTRIC PROBES
ENERGY LOSSES
HEAT LOSSES
HEATING
IMPURITIES
INSTABILITY
JIPPT-2 DEVICE
LANGMUIR PROBE
LAYERS
LIMITERS
LOSSES
PLASMA HEATING
PLASMA INSTABILITY
PLASMA SCRAPE-OFF LAYER
PROBES
PUMPED LIMITERS
STELLARATORS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES