SPRED spectrograph upgrade: High-resolution grating and improved absolute calibrations
- 1 August 1986
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 57 (8) , 2043-2045
- https://doi.org/10.1063/1.1138784
Abstract
Two improvements to the SPRED multichannel VUV spectrographs used on the TFTR and PBX tokamaks have been made: (1) a new 2100-g/mm grating covering the 100–320-Å region with 0.4-Å resolution (FWHM) has been added to the existing 450-g/mm grating (100–1100 Å with 2-Å resolution), and (2) the TFTR SPRED has been absolutely calibrated using synchrotron radiation from the NBS SURF II facility, while the PBX system has been calibrated using conventional branching ratios along with line ratios from charge-exchange-recombination excited lines. The availability of high-resolution spectra in the 100–320-Å range provides improved measurements of metallic ion emissions and, when the instrument views across a neutral beam as in PBX, allows carbon and oxygen densities to be measured via charge-exchange-recombination spectroscopy.Keywords
This publication has 10 references indexed in Scilit:
- Calibration of a VUV spectrometer–detector system using synchrotron radiationApplied Optics, 1986
- Grazing incidence reflection coefficients of rhodium, osmium, platinum, and gold from 50 to 300 ÅApplied Optics, 1985
- Relative calibration of grazing incidence spectrometers from charge-exchange excitation of hydrogenic ionsApplied Optics, 1985
- Determination of plasma-ion velocity distribution via charge-exchange recombination spectroscopyPhysical Review A, 1984
- Grazing incidence time-resolving spectrograph for magnetic fusion plasma diagnosticsReview of Scientific Instruments, 1984
- Multichannel grazing-incidence spectrometer for plasma impurity diagnosis: SPREDApplied Optics, 1982
- Reduced absolute uncertainty in the irradiance of SURF-II and instrumentation for measuring linearity of X-ray, XUV and UV detectorsNuclear Instruments and Methods in Physics Research, 1982
- Time-resolving extreme ultraviolet spectrograph for fusion diagnosticsReview of Scientific Instruments, 1981
- Unfolding first and second order diffracted radiation when using synchrotron radiation sources: a techniqueApplied Optics, 1975
- Measurement of Absolute Radiation Intensities in the Vacuum-Ultraviolet RegionJournal of the Optical Society of America, 1963