Charge-exchange recombination spectroscopy measurements of ion temperature and plasma rotation in PBX Page: 5 of 16
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varied on a shot-to-shot basis by rotating the plane mirror about its vertical
axis. With this arrangement, a scan along the plasma midplane is achieved.
An aperture in the optical train defines an f/10 optical system.
Optical access to both the NW perpendicular and the SW tangential beam
is desirable, since for a given plasma discharge, a single beam may not be
utilized for the entire beam heating period. Therefore, a fiber optically
coupled telescope system is installed to view across the SW beam. The output
of the fibers is fed directly into the spectrometer entrance slit. At
present, only one viewing system can be utilized for a single discharge, since
the installation of the fiber system necessarily obscures optical access to
the NW beam viewing optics. Future experimental upgrades will alleviate this
The low wavelength limit of the optics viewing the NW beam is
approximately 2500 A. This is presumably due to the uncoated aluminium
mirrors which are used for beam steering. The fiber optically coupled system
cuts off at wavelengths shorter than about 3500 A, due to both internal
coating of :he machine window port and the transmission characteristics of the
optical fibers used. Other groups working with fiber systems have reported
good performance down to the 3000 A range.6
For the results discussed here, the spectrometer was used in third order
to measure the CXRS line of 07+ at 2976 A. In this spectral regime, the 1180
grooves/mm grating had a reciprocal dispersion of 2.2 A/mm. A blocking filter
was installed in front of the entrance slit to eliminate spectral interference
from overlapping orders of diffraction. Spectrometer wavelength and
dispersion calibrations are accomplished with a simple Hg pen lamp.
The output of the spectrometer is coupled to an intensified photodiode
array detector (Princeton Applied Research Corporation, Model 1420). Full or
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Jaehnig, K.P.; Fonck, R.J.; Ida, K. & Powell, E.T. Charge-exchange recombination spectroscopy measurements of ion temperature and plasma rotation in PBX, report, November 1, 1984; New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc1111268/m1/5/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.