Study of radial potential fluctuations by using a gold neutral beam probe system.
A study of fluctuation is one of the main issues in fusion plasma researches. The potential and its fluctuation are measured by a gold neutral beam probe (GNBP) in the tandem mirror GAMMA10. Since there is no stable isotope ((197)Au approximately 100%), there are little measurement errors. GNBP system can measure the potential with about +/-30 V of error. The time and spatial resolutions are estimated to be about 3 micros and 5 mm, respectively. During the formation of axial confining potentials, the radial profiles of the potential and its fluctuation were successfully measured in GAMMA10. GNBP is a useful tool for the study of radial potential fluctuation directly in plasmas.
Mizuguchi
M
M
Plasma Research Center, University of Tsukuba, Tennodai, Tsukuba, Ibaraki 305-8577, Japan. mizuguchi_masanori@prc.tsukuba.ac.jp
Yoshikawa
M
M
Miyata
Y
Y
Goshu
S
S
Nakada
M
M
Oono
Y
Y
Nakashima
Y
Y
Imai
T
T