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 to 320 A region with 0.4 A resolution (FWHM) has been added to the existing 450 g/mm grating (100 to 1100 A with 2 A 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 to 320 A 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)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5628855
- Report Number(s):
- PPPL-2339; ON: DE86011167
- Country of Publication:
- United States
- Language:
- English
Similar Records
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
SPECTROMETERS
CALIBRATION
TFTR TOKAMAK
CARBON IONS
CHARGE EXCHANGE
OXYGEN IONS
RECOMBINATION
CHARGED PARTICLES
CLOSED PLASMA DEVICES
IONS
MEASURING INSTRUMENTS
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS
700102* - Fusion Energy- Plasma Research- Diagnostics