Coupling of an optical multichannel analyzer to a vacuum spectrometer using a photon converter

This paper discusses multichannel spectral devices that operate in the vacuum ultraviolet that generally employ microchannel plates (MCP) and are placed at the instrument focal plane. An alternative is to replace the MCP with a scintillator which converts the short wavelength light to the visible. A multichannel normal incidence spectrometer has been constructed that employs a tetraphenyl-butadiene (TPB) scintillator which is coupled to the Optical Multichannel Analyser (OMA) using high quality camera lenses. These allow for magnification, or reduction, of the spectral image. Results will be given on data obtained, from the HBTX1B reversed field pinch device, both in spectral survey and spectral line resolution applications