Overview
The beamtime on July 21 is the final shift of the dec 2022 epix10ka calibration beamtimes. From the December beamtimes two primary problems were observed, the check mark problem for the small 10k's and 3 out of the 4 quads of the MFX 2M showing values that were too low after switching.
INSERT IMAGES for the problems.
We believe the problem is due to the X-ray pulse arriving to early in the measurement cycle, and only partially within the ACQ window, For the upcoming beamtimes 4 detectors will be evaluated: epix10ka front facing (no. 27), epix10ka sidefacing 1mm Si, ePix10k2M.1, and a prototype of the ePix10ka non-ghosting ASIC (NG). For the first 2 shifts, the primary aims are (in order of importance):
- Evaluate the problems observed for the 2M and the smalls and correct these, so we can properly calibrate the smalls during the final beamtime.
- to evaluate the linearity and switching dependence on the total flux hitting the detector, i.e. pinhole experiment;
- to evaluate the magnitude of the tigerteeth in switching when running with CompEnOn and Off,
- evaluate the performance of the NG detector (linearity, switching, ghosting).
The aim of the final shift is to calibrate the small ePix10ka detectors when we have corrected the problems observed in december so we have valid calibration data for all detectors. For all 3 beam times, we will be set up to measure airscatter at different fluxes. Prior to going to the beamtime, the following work has to be done:
- DAQ scripts for time scan and intensity scans have to be identified and tested that they run,
- python visulisations for a few pixels that show both lineaity (ADU vs. wave-8), and the timing scans (dely vs measured average intesity);evaluation of dropped shots to see if there is any persistance.
- as well as the scope setup allowing us to see the x-ray pulse position compared to ACQ window has to be verified and ready;
Experimental setup
Measurement plan