sPHENIX Event Plane Detector discussion

[Eric Mannel <mannel AT bnl.gov>]

Rosi-

This is impressive for first day data.

My suggestion is that the bias voltage be set at the nominal operating voltage for your SiPMs (60V? including offsets) and continue to get some data.  It would be good to compare the waveforms for the channels that have the correct Meritec cable (100 Ohm impedance matched) and the Meritec cables that have hook up wire to see if there is any difference and if we can proceed with building up the 2 boxes over the next 2 weeks and have at least one of them ready for installation next access day.

Eric

On 7/20/2023 6:12 AM, Rosi Reed wrote:

Hi sEPDers,

Attached is a plot of the ADC from channel 68 from runs 22024 - 22028, where we can see a clear mip peak!  It is lower than the cosmic test data as we are currently running at a lower bias voltage and I don't want to change things in the wee hours of the morning.  (This is one of the nicer looking ones, but most channels do have a mip peak.  This can all be discussed shortly.)

This is about 400k events.  We are already in the big-partition and it seems that Dan and Tristan did a good job of timing us in, we seem to be perfectly timed in.

Cheers,

Rosi

--

Rosi Reed
RHIC/AGS UEC member
Associate Professor, Physics Department
Lehigh University
(610)758-3907
16 Memorial Drive East Office 406
Bethlehem, PA 18015
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Eric J. Mannel, Ph.D.
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