[Halld-tagger] [EXTERNAL] Re: DBeamPhoton tests

[Curtis A Meyer]

That looks like it could be difficult to simulate. Curtis

On Apr 24, 2020, at 11:46, Alexander Austregesilo <aaustreg at jlab.org<mailto:aaustreg at jlab.org>> wrote:

Hi,

I looked at the accidental corrected rho yields as a function of energy for the three test runs. You can see the plots on this wiki page:

https://halldweb.jlab.org/wiki-private/index.php/2020_TagM_Threshold_Test

Comparing the two versions with and without the requirement of ADC/TDC matching for the hodoscope, I only see a loss of events below 1% in almost the full energy range. There is only one 100MeV-wide bin near 9.1GeV, where the loss is about 15%. Could this be a sign of a broken or miscalibrated TDC?

For the 2 runs before the adjustment of the microscope thresholds, the loss of rho events with tagged beam photons is close to 30% as expected. Once the thresholds were fixed in run 71724, the loss goes down to 10% in the higher-energy part of the microscope, while it completely recovers for the low-energy part. What is the reason for this discrepancy? New vs old fibers?

Best regards,

Alex

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Curtis A. Meyer | MCS Associate Dean for Research
The Otto Stern Professor of Physics
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