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As Chris pointed it out, the effect will of course depend on the magnitude of the field but also on the sensor itself. That's why it important to test the sensors for various magnetic field (at least 1.9T and 0T, but also possibly with one or two more points in between).

Proposed Run Plan

• Measurements to be performed at each setting:

Most of the measurements will be performed at each sensor configuration:* Overl

• • Overall efficiency
  • Efficiency map
  • Charge sharing, overall and map
  • Pulse height distribution, bulk and electrode region
  • other

• Statistics needed at each sensor configuration

The assumption here is based on achieving a statistical error of 1% on the overall efficiency for each sensor configuration. It seems a reasonable number when comparing efficiencies as a function of the bias voltage for example. This means that we need about 10000 good tracks (reconstructed and going through the center part of the sensors). Based on the 2008 TB data taking experience, the efficiency of reconstructing good tracks from all triggers is about 20%. Assuming that 5K triggers are recorded in 20 minutes, we will need a bit less that 4 hours. Let's round to 4 hours.

• Scans

Again, we should keep in mind that we will test two new sensors. For example, the depletion voltage for these new sensors is not precisely known. All quantities (in particular the overall efficiency) should be measured as a function of:* Bif