SPRED spectrograph upgrade: High-resolution grating and improved absolute calibrations
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-A-circle region with 0.4-A-circle resolution (FWHM) has been added to the existing 450-g/mm grating (100--1100 A-circle with 2-A-circle 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-A-circle 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.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- OSTI ID:
- 5405961
- Journal Information:
- Rev. Sci. Instrum.; (United States), Vol. 57:8
- Country of Publication:
- United States
- Language:
- English
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Absolute calibration of a SPRED (Spectrometer Recording Extended Domain) EUV (extreme ultraviolet) spectrograph for use on the DIII-D tokamak
Photometric Calibration of the SPRED at the FTU Tokamak
Related Subjects
PBX DEVICES
PLASMA DIAGNOSTICS
ULTRAVIOLET SPECTROMETERS
TFTR TOKAMAK
CALIBRATION
GRATINGS
RESOLUTION
CARBON
CHARGE EXCHANGE
EXTREME ULTRAVIOLET RADIATION
ION DENSITY
OXYGEN
RECOMBINATION
SYNCHROTRON RADIATION
BREMSSTRAHLUNG
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
ELEMENTS
MEASURING INSTRUMENTS
NONMETALS
RADIATIONS
SPECTROMETERS
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS
ULTRAVIOLET RADIATION
700102* - Fusion Energy- Plasma Research- Diagnostics