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The machine base rates, and the resulting frequencies that can be hit if the Run trigger is kept set when changing the DAQ trigger, can be seen in the Excel file below.machine base rates and frequencies we can hit when run and DAQ clocks are different.xlsx
Allowed ACQ trigger rates for set Run trigger rate LCLS-II
Quantum Efficiency
For the prototype detector, a small 500 um thick Si sensor was used with the standard entrance window (1um Al, 1 um non-sensitive Si) was used. For the final detector, a full-size 500 um thick Si sensor with a thin entrance window (Sintef - 100nm Al, 100nm non-sensitive Si) will be used. A first-order estimate of the resulting detection efficiency as a function of photon energy for the two types of sensors can be seen in Figure 6. It should be noted that the non-sensitive region and the Al thickness have not been measured and are best estimates. For the plots stating "with shield" the detection efficiency has been calculated assuming a 25 um thick Polyimide shield located in front of the sensor. An excel sheet containing the values for both sensors can be found under the Figure.
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