Author/Authors :
Numakura، نويسنده , , T. F. Cho ، نويسنده , , T. and Kohagura، نويسنده , , J. and Hirata، نويسنده , , M. and Tomii، نويسنده , , Y. and Kiminami، نويسنده , , S. and Shimizu، نويسنده , , K. and Morimoto، نويسنده , , N. and Takahashi، نويسنده , , Y. and Imai، نويسنده , , T. and Miyoshi، نويسنده , , S.، نويسنده ,
Abstract :
Tomographic reconstructions of X-ray emission from hot electrons having a temperature of several tens of keV and cold electrons having a temperature ranging below 100 eV have been carried out by the use of the novel position-sensitive X-ray diagnostic system. The X-ray detection system in the thermal-barrier region of the GAMMA 10 tandem-mirror plasmas consists of a 48-channel silicon semiconductor detector array and the 50-channel microchannel plates (MCPs). When we make outward shifts of the second-harmonic electron cyclotron layers radially by intensifying the mirror magnetic fields in the thermal-barrier region, tomographically reconstructed signals by using the MCP show hollow X-ray profiles and the X-ray reconstructed signals obtained with the semicondcutor detector indicate a good axisymmetric radial profile peaked on the magnetic axis. Several applications including investigation of these hot electrons due to the second-harmonic electron cyclotron heating are made with the newly developed X-ray diagnostic systems.
