Tried to double check beam-target overlap by changing beam horizontal coordinate.
In the tablethe counts in the 4000-5200 keV region in each of the detectors are recorded. Counts were taken for a total time of 5 minutes per beam position. Attached are the xy plots.
I think the tests are inconclusive given that the beam in the first three points were not ideal, with many low intensity injections. Moreover, changing the beam often ends up causing the stats in DSSD0 to rise significantly (consequentely needing to shake the detector to go back to normal operation).
| horizontal |
DSSD0 |
DSSD1 |
DSSD2 |
DSSD3 |
Comments |
| 4.5 mm |
2966 |
60 |
3826 |
1880 |
stats went up at the end of the run (attachment 1 is the xy plot, attachment 1 is the multiplicity showing the noise). |
| 5 mm |
3826 |
68 |
1945 |
1719 |
stats ok. Attachment 3 |
| 5.5 mm |
2443 |
64 |
1 |
1352 |
stats ok. beam bad, called 2222, fixed it. Attachment 4 |
| 5.5 mm good beam |
3587 |
57 |
6 |
2057 |
repeated measurment with good beam. Suspected something wrong with DSSD2 |
| 4.5 mm good beam |
5132 |
64 |
4 |
2153 |
stats bad at the end, confirmed something wrong DSSD2, Jordan did some ASIC check load and made it go back to normal operation. Attachment 5. |
After fixing DSSD2, statsin DSSD0 went up again. Stopped the test after shaking again the detector.
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I have put back the beam at 4mm horizontal. I switched off the target by moving it to x=-10000--->x=-5000 (previosuly X=-19800). Denisity went down to 5E9. However, I decided under Jordan's suggestion to make another test and I put the target back to x=-19800: interestingly the density went up to 5E12 and start oscillating for a while between 5E12 and 5E11.
I did a 10 minute check of counts in the 4000-5200 keV region with this configuration, then switched off the target and did another 10 minutes test. Results:
| horizontal 4 mm |
DSSD0 |
DSSD1 |
DSSD2 |
DSSD3 |
| target on |
9719 |
163 |
7892 |
5210 |
| targte off |
6579 |
108 |
6092 |
3496 |
|