...
- 8am MCC meeting met incoming LCLS primary user with ePix (500um silicon for X-rays) who are also battling with radiation damage and showed interests in what we are doing.
- Did a threshold scan (Run 178) on the RTI module and found threshold still narrowed distributed around 3000e but noise got substantially worse at ~500e,
- Turned off RTI bias from the remote control console, but the LV read back still says 6mV, Caladium ADC Vmon=15mV, Imon=5mV which are effectively pedestals. Noise up to 1100e when unbiased.
- Reestablished RTI bias for -80V with BK setV=0.080, readback 0.085 and ADC Vmon 0.088-0.093. Threshold scan Run 179: threshold still narrowly groups around 3000e, noise still ~500e, but he right edge bad pixels cleaned up. Bizarre looking noise RMS vs channel map with systematic alternating column pattern and multiple clusters of values within even the same column from 300e – 900e depending on pixel location.
- 11:00: Used an access to remove Koji's FE65P2 module for shipping. Now will run YARR parasitically for the remainder of the beam time. Next move is to do a scan over the RTI module before switching to the cold box.
| Run | Position | Comment |
|---|---|---|
| 630 | Start position | |
| 631 | y+3 mm | No YARR |
| 632 | y+2 mm | No YARR |
| 633 | same | Retake with YARR (now in all subsequent runs). Delta y (rows) = 0-100 |
| 634 | y-2 mm | Delta Y = 50-150 |
| 635 | y-4 mm | Delta y = 120-220 |
| 636 | y-4 mm | Delta y = 220-300, Delta x = 45-80. Stopped beam for RP to survey Koji's modules |
| 637 | y-2 mm | only got 1000 events before the RCE gave up (wasn't quite to 2000 from 636 because it was stopped manually) |
| 638 | same as 637 | |
| 640 | x-4 mm | Huge noise burst! See the timing distribution in ./bin/run640.root |
| 641 | y+4 mm | no noise burst |
| 642 | y+4 mm | noise burst |
| 643 | same as 642 | noise burst |
| 644 | y+2 mm | |
| 645 | y+2 mm |