Open AccessEXPERIMENTAL INVESTIGATION ON PROPERTIES OF E. C. H. PLASMA AND HOT ELECTRON RING
Author(s) -
Guan Weishu,
Wang Enyao,
Cheng Shi-Qing,
Duan Shuyun,
Wang Ji-Hai,
Gu B,
Shang Zhenkui
Publication year - 1989
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.38.228
Subject(s) - plasma , gyrotron , radius , diamagnetism , atomic physics , electron , electron temperature , materials science , torr , ring (chemistry) , arc (geometry) , physics , magnetic field , nuclear magnetic resonance , chemistry , nuclear physics , computer security , geometry , organic chemistry , mathematics , quantum mechanics , computer science , thermodynamics
The ECRH experiment has been carried out on a simple mirror-MM-2 device by use of a 15 GHz high power gyrotron. The experimental results showed that the preionization time will be rapidly shorten following raising the pressure of puffed gas. Duing the "C-mode" operation where the gas pressure is higher, the radial profile of plasma density exhibits a saddle shape. The gas "pressure window" for building a hot electron ring is (0.4-1.2)×10-5 Torr, as the gyrotron output is about 30 kW. Simply by using a movable Langmuire probe accompanied with diamagnetic measurment. it has been determined that the hot electron ring radius is 7 cm, the thickness is about 4 cm and the axial boundary of the ring extends from Z= ±10 cm to Z=±20cm, when the central field is 2.95kg. The hot electron temperature is 140 to 170 keV. The average beta value of hot electron ring is (4-5)%. The radial bursts of electrons due to ring instabilities accompanied with the drops of the diamagnetic signal have also been observed.