[Dsg-rich] [EXTERNAL] meeting with DSG

[George Jacobs]

Hi All,

The current RICH compressors do not have the air flow capacity to supply 2 detectors even if both of them are operating. These compressors were selected based on a requirement to supply a total of 600 slm air to cool 2 detectors or 300 slm per detector. That original air flow requirement was low by a factor of 3. The current compressors are rated for a duty cycle of up to 50%. That means compressor is running no more than 50% of the time. We see from actual operation it has been running at 90% duty cycle since the RICH was installed in Hall B. The current compressors are simply not designed for that. The current compressors need replaced by ones with significantly larger air flow  capacity that have a 100% duty cycle, which means it is rated for continuous operation.

The RICH detectors require significantly larger capacity air compressors such that a single compressor can supply all six sectors during continuous operation at  or near 100% duty cycle. I have identified such a unit and am awaiting a quote from the company.

Cheers,
George


--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7021
(email) jacobsg at jlab.org


________________________________
From: Dsg-rich <dsg-rich-bounces at jlab.org> on behalf of Marco Mirazita <Marco.Mirazita at lnf.infn.it>
Sent: Monday, October 14, 2019 11:35 AM
To: Tyler Lemon <tlemon at jlab.org>
Cc: dsg-rich at jlab.org <dsg-rich at jlab.org>; marco mirazita <mirazita at jlab.org>
Subject: Re: [Dsg-rich] [EXTERNAL] meeting with DSG

Hi Tyler,
thank you for the minutes, just one clarification.
The system should have both compressors working together routinely, and,
ideally, in case of failure of one compressor, the second should be able
to supply both RICHs for short periods, until the broken one is
repaired.
Best regards,
Marco


Il 2019-10-14 16:41 Tyler Lemon ha scritto:
> Hello,
>  Attached are the minutes from today's meeting.
>
>  Vincenzo,
>  Could you please send us a copy of the slides you showed during the
> meeting? I'll append them to the minutes for when they're posted to
> the DSG website.
>
>  Best regards,
>  Tyler
>
> -------------------------
>
> FROM: Dsg-rich <dsg-rich-bounces at jlab.org> on behalf of Brian Eng
> <beng at jlab.org>
>  SENT: Monday, October 14, 2019 10:17 AM
>  TO: marco mirazita <mirazita at jlab.org>
>  CC: dsg-rich at jlab.org <dsg-rich at jlab.org>
>  SUBJECT: Re: [Dsg-rich] [EXTERNAL] meeting with DSG
>
> Hi Marco,
>
>  Regarding the FPGA temperatures, since we don't have the FPGA code
> itself we can only make an educated guess, but it's quite likely that
> it is using the on-die temperature sensor.
>
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.xilinx.com_support_documentation_user-5Fguides_ug480-5F7Series-5FXADC.pdf&d=DwICAg&c=CJqEzB1piLOyyvZjb8YUQw&r=sLmN_kLNB8f_QBCYTgZaO1cK1zcpXSUHz0BQf_04bYk&m=4l8m15H_iO90wbz-GE_ylHYl-UMwiv1N63B-rH6pta4&s=u_Q6pcX79VN4Vc1R7I-3H8yiC7JThtYK--0L7-IupLc&e=
> [1]
>  (page 14, figure 1-1)
>
>  Note that this sensor has an error of +/- 4C when the temp is < 100C
>
>  > On Oct 14, 2019, at 3:35 AM, mirazita at jlab.org wrote:
>  >
>  >
>  > marco mirazita has invited you to a meeting.
>
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>
> Links:
> ------
> [1]
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.xilinx.com_support_documentation_user-5Fguides_ug480-5F7Series-5FXADC.pdf&d=DwICAg&c=CJqEzB1piLOyyvZjb8YUQw&r=sLmN_kLNB8f_QBCYTgZaO1cK1zcpXSUHz0BQf_04bYk&m=4l8m15H_iO90wbz-GE_ylHYl-UMwiv1N63B-rH6pta4&s=u_Q6pcX79VN4Vc1R7I-3H8yiC7JThtYK--0L7-IupLc&e=
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>
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