[Dsg-rich] RICH status

[Marco Contalbrigo]

Hi Tyler,
the RICH maintenance condition is compressor OFF, LV and
HV OFF and only nitrogen flow.

The current situation (compressor ON, LV OFF) is unforeseen.
>From the slow control, it seems that the humidity levels
are not significantly affected, nevertheless I would
recommend to keep RICH in this condition for the
shortest time possible and meanwhile to monitor the
humidity trend.

After several months of nitrogen flow, the RICH interior
could be dried and acting as a moisture pump. Thus we
may fed inside humidity (from cooling leakage) without
seeing it.

For the same reason, I recommend to not have cooling
air flow in absence of nitrogen flow (e.g. during future
tests or upgrades).

Thanks, Marco.

On Tue, 8 May 2018, Tyler Lemon wrote:

> Hi Marco,
> 
> The Forward Carriage is being moved today, so we are unable to get access to
> the compressor for the tests and to power it down.
> 
> We will perform the tests tomorrow.
> 
> Best regards,
> Tyler
> 
> _______________________________________________________________________________
> From: "Marco Contalbrigo" <mcontalb at fe.infn.it>
> To: "Tyler Lemon" <tlemon at jlab.org>
> Cc: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>, "dsg-rich"
> <dsg-rich at jlab.org>
> Sent: Tuesday, May 8, 2018 8:39:26 AM
> Subject: Re: [Dsg-rich] RICH status
> 
> Hi Tyler,
> tests are welcome but please keep attention to the
> humidity level inside the RICH. The compressor flow
> leakage brings humidity, in particular when not warmed
> up by the electronics (with LV off).
> Thanks, Marco.
> 
> On Tue, 8 May 2018, Tyler Lemon wrote:
> 
> > Hi Marco,
> >
> > Before turning off the RICH compressor today, we want to perform a two tests:
> >
> > First, we want to see whether the airflow can be made more steady by
> adjusting the
> > air cooling panel's regulator while keeping the same flow level. This should
> > isolate the airflow more from the compressor's on-off cycle.
> >
> > The second test is to see the maximum airflow capable from one outlet of the
> air
> > cooling panel. This would tell us more about the cooling capabilities we have
> for
> > the existing system and whether we could potentially run the current system
> for two
> > RICH sectors.
> >
> > We will send the results of these tests when they are complete.
> >
> > Best regards,
> > Tyler
> >
> >______________________________________________________________________________
> _____
> > From: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>
> > To: "dsg-rich" <dsg-rich at jlab.org>
> > Sent: Monday, May 7, 2018 3:42:56 PM
> > Subject: [Dsg-rich] RICH status
> >
> > Hi all,
> > I made today a new set of calibration runs, see
> > https://logbooks.jlab.org/entry/3573975.
> > The HV and LV are off.
> > The compressor can now be turned off.
> > Marco
> >
> > _______________________________________________
> > Dsg-rich mailing list
> > Dsg-rich at jlab.org
> > https://mailman.jlab.org/mailman/listinfo/dsg-rich
> >
> >
> 
>