[Dsg-rich] [EXTERNAL] RICH electronics

[Matteo Turisini]

Hi Tyler,

the high end of our FPGAs is 85 celsius.
70 celsius was adopted as a precaution in the alarm system (now reduced to 60?)
Ben can for sure argue better than me.

Cheers to everybody,

Matteo 

> Il giorno 23 set 2019, alle ore 22:48, Amrit Yegneswaran <yeg at jlab.org> ha scritto:
> 
> tyler 
> address fpga temp issue with ben.
> i believe 60c is right at the edge of timing issues, not sure.
> From: Dsg-rich <dsg-rich-bounces at jlab.org> on behalf of Tyler Lemon <tlemon at jlab.org>
> Sent: Monday, September 23, 2019 3:11 PM
> To: Marco Mirazita <Marco.Mirazita at lnf.infn.it>
> Cc: dsg-rich <dsg-rich at jlab.org>
> Subject: Re: [Dsg-rich] [EXTERNAL] RICH electronics
>  
> Hi Marco,
> 
> Looking back at EP temperatures during steady operations (I picked 3/10/2019 to 3/31/2019), Hardware Interlock RTDs were ~40 deg C and FPGA temperatures were ~60 deg C.
> 
> Is there a temperature increase that would be considered acceptable? For example if the FPGA temperatures were ~70 deg C rather than ~60 deg C?
> 
> The first test should be determining what flow rate is actually needed to maintain EP temperatures in that acceptable range with all RICH electronics on.
> 
> -Tyler
> 
> From: Marco Mirazita <Marco.Mirazita at lnf.infn.it>
> Sent: Monday, September 23, 2019 9:01 AM
> To: Tyler Lemon <tlemon at jlab.org>
> Cc: dsg-rich <dsg-rich at jlab.org>
> Subject: Re: [Dsg-rich] [EXTERNAL] RICH electronics
>  
> Hi Tyler,
> sorry, I had in mind that the replacement of the PT was scheduled for 
> last Wednesday.
> 
> The tests we have in mind to optimize the cooling system is basically 
> what you said. But we still have to make a plan of the specific 
> measurements we need. We will do this plan in the next weeks.
> Any suggestion from you and the DSG is welcome.
> 
> Best regards,
> Marco
> 
> 
> Il 2019-09-20 20:46 Tyler Lemon ha scritto:
> > Hi Marco,
> > 
> >  The PT replacement has not been completed. It is scheduled for next
> > Wednesday September 25.
> > 
> >  As for the visit to optimize RICH running conditions, I will not be
> > at work for at least part of the week of October 21 to October 25,
> > however there should be other people from DSG that would be able to
> > help.
> > 
> >  What tests are being planned for the visit? Would it essentially be
> > varying the settings of the cooling system (flow rate, buffer tank
> > pressure, compressor output pressure) and seeing how the temperature
> > within RICH is affected?
> > 
> >  Best regards,
> >  Tyler
> > 
> > -------------------------
> > 
> > FROM: Marco Mirazita <Marco.Mirazita at lnf.infn.it>
> >  SENT: Friday, September 20, 2019 12:21 PM
> >  TO: Tyler Lemon <tlemon at jlab.org>
> >  CC: dsg-rich <dsg-rich at jlab.org>; Valery Kubarovsky <vpk at jlab.org>;
> > marco contalbrigo <mcontalb at fe.infn.it>
> >  SUBJECT: Re: [EXTERNAL] RICH electronics
> > 
> > Hi Tyler,
> >  do you know if Bob has completed the replacement of the FT?
> >  If so, the compressor could be restarted on Monday morning, once we
> > are
> >  sure everything is working properly I can turn on the RICH
> > electronics
> >  and keep it on for the night and then make the tests on Tuesday
> > morning.
> > 
> >  As you know, we didn't have much time to optimize the working point
> > of
> >  the cooling system after the RICH installation, we simply choose
> > running
> >  conditions that ensure a safe operation of the detector.
> >  But these running conditions might be problematic with two RICH
> > modules
> >  and definitely not sustainable in case of failure of one of the two
> >  compressors.
> >  Therefore, also in preparation of the upcoming CLAS12 data taking,
> > I'm
> >  planning a visit to JLab for Dario and Sandro to try to optimize the
> >  running conditions, and to be effective this work must be coordinated
> > 
> >  with you and the DSG.
> >  The proposed dates are from October 21 to October 31. Is this plan ok
> > 
> >  for you?
> >  Thank you,
> >  Marco
> > 
> >  Il 2019-09-18 14:12 Tyler Lemon ha scritto:
> >  > Hi Marco,
> >  >
> >  > Bob Miller has scheduled the replacement of the faulty pressure
> >  > transducer (PT) on the air-cooling buffer tank for next Wednesday,
> >  > September 25.
> >  >
> >  > Could the tests be scheduled to start Thursday September 26?
> >  >
> >  > Best regards,
> >  > Tyler
> >  >
> >  > -------------------------
> >  >
> >  > FROM: Marco Mirazita <Marco.Mirazita at lnf.infn.it>
> >  > SENT: Wednesday, September 18, 2019 4:08 AM
> >  > TO: Tyler Lemon <tlemon at jlab.org>
> >  > CC: dsg-rich <dsg-rich at jlab.org>; Valery Kubarovsky <vpk at jlab.org>;
> >  > marco contalbrigo <mcontalb at fe.infn.it>
> >  > SUBJECT: [EXTERNAL] RICH electronics
> >  >
> >  > Hi Tyler,
> >  > the RICH electronics is off since quite a lot of time and in
> >  > preparation
> >  > of the upcoming CLAS12 running I would like to turn it on to verify
> >  > that
> >  > everything is still working and eventually to take new scaler
> >  > calibration data.
> >  > I could plan this work for the beginning of the next week.
> >  > In preparation for that, we should coordinate to have all the
> > systems
> >  >
> >  > ready. Would you be available to start the compressor for the test?
> >  > Thank you,
> >  > Marco
> > 
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