Photometric Calibration of the SPRED at the FTU Tokamak
The SPRED spectrometer was photometrically calibrated by using the FTU tokamak plasma and the Grazing Incidence Time Resolving Spectrometer (GRITS) from the Johns Hopkins University [Stratton, Nucl. Fusion, Vol. 24, No. 6, pp. 767-777, 1984]. The photometric calibration of the GRITS spectrometer was transferred to the SPRED [Fonck, R.J., Applied Optics, Vol. 21, No. 12, p. 2115 (1982)] by directly comparing the intensity of bright lines emitted from the FTU tokamak plasma that were simultaneously measured by both spectrometers. The GRITS spectrometer ({lambda} = 10 - 360 {angstrom}; {Delta}{lambda} {approx} 0.7 {angstrom}) was photometrically calibrated in the 50 - 360 {angstrom} spectral range at the SURF II synchrotron light source at NIST in Gaithersburg MD in August 1997. The calibration of each SPRED grating was performed separately. These gratings covered the short wavelengths: 100 - 300 {angstrom}({Delta}{lambda} - 1.4 {angstrom}) and the long wavelengths: 200 - 1800 {angstrom} ({Delta}{lambda} {approx} 7 {angstrom}). This calibration should be accurate until the microchannel plate of the SPRED is exposed to atmospheric pressure. This calibration is similar to the one obtained by Stratton [Stratton, Rev. Sci. Instrum. 57 (8), pp. 204,3 August 1986].
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15004653
- Report Number(s):
- UCRL-ID-147990; TRN: US0304916
- Resource Relation:
- Other Information: PDF-FILE: 10 ; SIZE: 0.3 MBYTES; PBD: 1 Dec 1999
- Country of Publication:
- United States
- Language:
- English
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