Transmissive x-ray beam position monitors with submicron position- and submillisecond time resolution
- BESSY GmbH, Albert-Einstein-Str. 15, 12489 Berlin (Germany)
- Micron Semiconductor UK, Lancing, BN15 8SJ (United Kingdom)
We present the development of fast transmissive center-of-mass x-ray beam position monitors with a large active area, based on a thinned position sensitive detector in both a duo- and a tetra-lateral variant. The detectors were tested at BESSY beamlines BL14.1, KMC-1, and KMC-2 and yielded signal currents of up to 3 {mu}A/100 mA current at 10 keV photon energy using the monochromatic focused beam of BL14.1. The active area sizes were 1x1 and 3x3 mm{sup 2} for the duo-lateral and 5x5 mm{sup 2} for the tetra-lateral devices, with the duo-lateral detectors currently being available in sizes from 1x1 to 10x10 mm{sup 2} and thicknesses between 5 and 10 {mu}m. The presented detectors' thicknesses were measured to be 5 and 8 {mu}m with a corresponding transmission of up to 93% at 10 keV and 15% at 2.5 keV. Up to a detection bandwidth of 10 kHz, the monitors provide submicron position resolution. For lower detection bandwidths, the signal-to-noise reaches values of up to 6x10{sup 4} at 10 Hz, corresponding to a position resolution of better than 50 nm for both detector sizes. As it stands, this monitor design approach promises to be a generic solution for automation of state-of-the-art crystal monochromator beamlines.
- OSTI ID:
- 21123939
- Journal Information:
- Review of Scientific Instruments, Vol. 79, Issue 6; Other Information: DOI: 10.1063/1.2938400; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Similar Records
Beam Positioning and Beam Polarization Monitor Based on Large Area HTS Pickup Coils
An anatomically realistic lung model for Monte Carlo-based dose calculations