Published November 1987
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ASDEX Johann spectrometer
- 1. GA Technologies, Inc., San Diego, CA (USA)
Description
A Johann spectrometer is a curved crystal instrument whereby X-ray photons are focused by a crystal onto a position sensitive detector. The geometrical relationship between the slit, the crystal and the detector is a circle known as the Rowland circle. Focusing is achieved by bending the crystal such that its radius of curvature is equal to the diameter of the circle. Initial results of test and evaluation of the crystal holders have shown that the micromachined aluminium holders are far superior to the handpolished stainless steel holders. The best focus is 70 μm FWHM in the visible with central 65% of the crystal in proper focus. (orig./GG)
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Additional details
Publishing Information
- Imprint Pagination
- 12 p.
- Report number
- IPP--III/127
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 19064838
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- ASDEX TOKAMAK; PERFORMANCE TESTING; PLASMA DIAGNOSTICS; X-RAY SPECTROMETERS
- Descriptors DEC
- CLOSED PLASMA DEVICES; MEASURING INSTRUMENTS; SPECTROMETERS; TESTING; THERMONUCLEAR DEVICES; TOKAMAK DEVICES