The heating of θ-pinch plasma produced by 18 KJ fast condensor bank was investigated at the caner stage in the increasing magnetic field. The electron temperature was determined from the absorption method of soft X-rays at initial pressures of 10-200 mTorr D
2. The time histories of neutron, visible light and hard X-ray's emissions were also observed. The soft X-ray measurements showed the higher (several KeV) and the lower (-10
2 eV) electron temperatures. The higher electron temperature can be observed in the condition that the plasma densities are within the extremly low region, which has the lower and the upper limits. The neutron detector showed the more intense signal in the plasma with the higher electron temperature than in the lower elctron temperature, in spite of the lower density.
The production of such higher temperature plasma can be considered as an dissipative phenomenon in the collisionless plasma, which may result from an microinstability, for in stance, the electron-ion two streaming instability refered to the θ-pinch configration.
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