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Soft X-ray Spectroscopic Imager Using a Micro channel Plate for Plasma Studies and its Calibration

We developed a soft x-ray spectroscopic imager using a pin-hole collimator, a changeable aluminum filter array, an MCP and a CCD camera. It can show not only the dynamic x-ray image from plasma but also a stationary image of x-ray with an energy band selected by using a pair of consecutive filters. Before installing the imager in the Hanbit plasma device in Korea Basic Science Institute, Daejeon, Korea, we suggested a simple method of conversion of pixel brightness values into the absolute x-ray photon flux density of the selected energy band by using the central pixel values. The conversion coefficients were obtained by using the measured x-ray spectra from a conventional x- ray generator. Alsowe did a simple calculation to produce a look-up table of the non-uniformity of pixel responses, for correction of the image distortion due to the MCP bias angle and the pin-hole geometry.