[Sbs_gems] [New Logentry] Brief Voltage Spike on uva_xygem_2

[David Flay]

Thanks Nilanga,

Zeke and I will do that before we start the next run.

Best regards,
David

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David Flay, Ph. D.
Hall A/C Staff Scientist
Thomas Jefferson National Accelerator Facility
Office: CEBAF Center, C119
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________________________________
From: Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu>
Sent: Monday, December 6, 2021 3:37 PM
To: David Flay <flay at jlab.org>; sbs_gems at jlab.org <sbs_gems at jlab.org>
Subject: [EXTERNAL] Re: [Sbs_gems] [New Logentry] Brief Voltage Spike on uva_xygem_2


Hmmm, that is a bit worrying.

I think, until we understand this a bit more, we should back down the HV on just this one module by 50 V.

I expect the reduction of efficiency to be very small because of this change. So I think we should do this soon.

Best

Nilanga

________________________________
From: Sbs_gems <sbs_gems-bounces at jlab.org> on behalf of flay at jlab.org <flay at jlab.org>
Sent: Monday, December 6, 2021 3:20 PM
To: sbs_gems at jlab.org <sbs_gems at jlab.org>
Subject: [Sbs_gems] [New Logentry] Brief Voltage Spike on uva_xygem_2

Brief Voltage Spike on uva_xygem_2 <https://logbooks.jlab.org/entry/3957495>

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Lognumber 3957495<https://logbooks.jlab.org/entry/3957495>. Submitted by flay<https://logbooks.jlab.org/user/flay> on Mon, 12/06/2021 - 15:17<https://logbooks.jlab.org/entries?start_date=1638818252&end_date=1638825452&book=HALOG>.

Logbooks:       HALOG<https://logbooks.jlab.org/book/halog>
Entry Makers:   flay

Just catching up on this after the DAQ has settled back in and the HCAL HV was power cycled.

At around 13:50 we had a HV spike on uva_xygem_2, see attached.

[https://logbooks.jlab.org/files/styles/plentybig/public/2021/12/3957495/uva_xygem_2_spike_12-06-21.png]
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