In-Air X-Ray Detectors : A New Field of Simple and Powerful Beam Diagnostics
- ESRF, 6 rue Jules Horowitz, BP220, F-38043 Grenoble cedex (France)
Crotch or beamport absorbers deal with the unused power of the synchrotron radiation generated by dipoles in electron storage rings. A tiny fraction of the very hard X-rays fully penetrate the absorber structure and enter the free air space behind it. Both at the ESRF (6GeV) and at ANKA (2.5GeV) it was shown that this tiny leakage power can be detected by a simple, compact and low-cost device consisting of a scintillator with optics and camera. Situated In-Air just behind the absorber it measures precisely the vertical electron beamsize. This imaging detector is also applied for 1 us, 5mA single shot measurements in the ESRF transfer-line. A 2nd detector type was developed, using the same leakage X-rays, that consists of a high-Z blade in combination with a small In-Air ionization volume. It generates a direct electric signal that is used for nanometer resolution measurements of vertical beam motion in a spectrum upto 1KHz. The concept and results of both types of detector used now in various applications are reported here that show their potential for simple and powerful beam diagnostics.
- OSTI ID:
- 20894917
- Journal Information:
- AIP Conference Proceedings, Vol. 868, Issue 1; Conference: 12. beam instrumentation workshop, Batavia, IL (United States), 1-4 May 2006; Other Information: DOI: 10.1063/1.2401407; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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