PLASMA DIAGNOSTICS USING VACUUM-ULTRAVIOLET RADIATION AND SOFT X-RAYSIN THE GAMMA-10 TANDEM MIRROR DEVICE

Plasma diagnostics using vacuum ultra violet (VUV) and X-ray radiation in the world largest tandem-mirror plasma-confinement-device GAMMA 10 are reported. In particular, the detection characteristics of microch annel plates (MCP) with 50 channels (anodes) are investigated using sy nchrotron radiation ranging from VUV to an X-ray regime (12 eV to 82.5 keV) for the purpose of detector fundamental researches as well as th eir development studies. These investigations also provide application s of MCP as imaging detectors including applications for spatially and temporally resolved plasma VUV and soft X-ray diagnostics. It is foun d that the detection efficiency of MCP remains within one order of mag nitude through dozens eV to several tens keV along with the physical m echanism interpretations of the MCP energy response, and the response uniformity of each channel for an imaging use is experimentally invest igated. Using these detailed and precise MCP calibration data, we appl y the MCP not only for a plasma-radiation imaging detector so as to re construct spatial profiles of emissivity but for a plasma diagnostic t ool to measure plasma-electron velocity distribution functions.