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DVCS-3 Updates

• Deadtime analysis in progress: main goals include

• Determine the livetime/deadtime correction factor (LTCF)
• Take a trigger rate/live rate and normalize using the current, adjust to the prescale, and then apply the LTCF.
• To make sure the deadtime is correctly computed, the deadtime, current and prescale factors should be in agreement more than 1%, especially for the range of rates in which the deadtime is linear.

• Currently analyzing run taken in April 2016, 13418 which was a dedicated run for the deadtime analysis, at three different currents (10, 15, 20 uA) using a liquid hydrogen target.
• There are other dedicated deadtime runs taken in February 2016 with a carbon target, 12471 to 12476 at a current of ~5 uA with different prescale factors ( ).

Deadtime Analysis

Plots from run 13418: dedicated deadtime analysis run

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Histogram displaying S0, S2 and the Cerenkov Detector's livetime. We can see that since the Cerenkov detector has the shortest livetime, its deadtime dominates compared to the other detectors.	xx
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Important ELog Updates

• Mongi's ELog update: DVCS ELOG LOGIN REQUIRED on May 1, 2017
• Mongi's ELog update: DVCS ELOG LOGIN REQUIRED on May 21, 2017