Development of a charge exchange recombination spectroscopy method for determination of ion temperature from H[sub α] line broadening in the Hanbit mirror device.

Ion temperatures can be determined from H[sub α] line broadening measured by charge exchange recombination spectroscopy on Hanbit, a mirror device. Since the H[sub α] line emission from hydrogen atoms in plasma edges is much larger than that of the charge exchange recombination emission of ions, the line shape of the latter is submerged into the former when measured by an array detector such as a CCD detector. Thus, a notching filter in front of a detector is needed to block out the central region of the emission line. An optical fiber array detector, which works as a notching filter as well as an array detector, has been developed, since the transmission characteristics of commercial notching filter are not suitable for the line-broadening measurements. The design concept of the optical fiber array detector is described, and the feasibility to determine ion temperatures from the H[sub α] line broadening measurements is estimated. [ABSTRACT FROM AUTHOR]