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- Bias voltage: we propose 8 values. For the Stanford reference sensor(with depletion voltage around 10V): 2,5,10,15,20,30,40,60 V. For the two new sensors, as the depletion voltage is not precisely known, we can either the same scan or do a binary scan in order to get more points around the knee (low bias, then high bias, then in the middle, then depending how the efficiency varies, more point in the first or in the second bin).
- B field: the minimum is two steps: 0T and 1.9 T (maximum dipole filed, ATLAS being 2T). If time permits, it would be useful to take one or two steps.beam incident angle:
cscsdfsdaf - Beam incident angle: What is the maximum angle achievable? In 2006, two steps were done: at 0 and 15 degree. We could repeat that, but if time permits an additional step at higher angle would be useful.
Summary:
If we want to perform all measurements at each scan step of the bias voltage, B field and beam angle, and assuming a 50% data taking efficiency:
8 (Bias V) x 2 (B field) x 2 (beam angle) x 4 (hours) x 50% = 256 hours = 11 days. The testbeam is 15 days, so we should have enough time.
It has to be checked if 4 hours are sufficient for the high statistics measurements, such as the efficiency maps. The high statistics measurements do not have to done at each setting/scan step, so we can certainly envisate to spend more time on several scan steps.