Speaker
Description
Conventional white beam photon beam position monitors (XBPMs) in light source front-ends detect the beam by measuring the drain current from illuminated metallic material (photoelectric). Another common method is the use of semiconductors like Diamond or SiC (photoconduction) however rarely (if any) for white beam due to the high power density. The latest development has been the GRID-XBPM at the APS* making use of X-ray fluorescence. Internal developments of XBPMs for the new beamlines being installed at the Australian Synchrotron has been progressing however the mechanical tolerances due to a smaller upstream mask has meant rethinking how the photon BPM could be implemented.
For the first time we propose a method to measure the power density profile via photoabsorption in 0.4 mm thick CVD diamond probes in a cross configuration, referred to as a thermal photon BPM (TBPM). By measuring the temperature differences between probes the centroid of the beam can be inferred. This report will present the analysis showing that it is possible to achieve a sensitivity of ~1000 ppm/um, a bandwidth of ~10 kHz for < 10 um step changes and robustness under mis-steer conditions.
Footnotes
- S. Oprondek et al., in Proc MEDSI 2018.
| Region represented | Asia |
|---|---|
| Paper preparation format | LaTeX |
