The ultra-soft x-ray multilayer mirror-based duochromator for the reverse field experiment reversed field pinch experiment
- Gruppo di Padova per Ricerche sulla Fusione, Euratom---ENEA---CNR---Universita di Padova Association, Padova (Italy)
- The Budker Institute of Nuclear Physics, Novosibirsk (Russia)
The ultra-soft x-ray duochromator based on two multilayer mirrors installed on the reversed field pinch experiment (RFX) reversed field pinch is described. Built at the Budker Institute of Nuclear Physics of Novosibirsk, it has been designed to monitor the time behavior of the hydrogen and helium-like resonant transitions of carbon and oxygen, the main impurities in the RFX emission spectrum, with the possibility of scanning the wavelengths between 16 and 45 {Angstrom}. The wavelengths can be independently selected for both the mirrors (made of Ni/C and Cr/C layers, respectively) via a {Theta}{endash}2{Theta} mechanism, without breaking the vacuum. The detector is based on a scintillator layer deposited on the head of a photomultiplier. Vacuum ultraviolet and visible radiation is cut by means of thin metal films (Fe, Al, Cr) deposited on a mylar substrate and on the scintillator. The wavelength resolution ({lambda}/{Delta}{lambda}) of 40 to 50 in the region of interest is provided by a Soller collimator and a precollimator stage placed in front of the mirror. The relatively large etendue allows one to perform observation in a wide range of experimental conditions. Sample results of the chordal observations are compared in absolute units with the predictions of a collisional{endash}radiative one-dimensional impurity transport code. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 451949
- Report Number(s):
- CONF-960543-; ISSN 0034-6748; TRN: 97:006306
- Journal Information:
- Review of Scientific Instruments, Vol. 68, Issue 1; Conference: 11. annual high-temperature plasma diagnostics conference, Monterey, CA (United States), 12-16 May 1996; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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