[Dsg-rtpc] BONuS Gas port map

Tue Jul 23 14:36:06 EDT 2019

Just to clarify: The overpressure in all 3 volumes - He4 buffer, DMS, and RTPC detector - should be no more than a fraction of a Torr - or less than 1” water column - above atmospheric pressure, which is much less than 1 psi gauge. Since these gases are not flammable or hazardous, we don’t plan to have a max. pressure test of these volumes - we will certainly run them extensively with SLIGHT overpressures. All three volumes will be protected against too much overpressure by bubblers. I believe that this is much simpler, more sensitive and failsafe than an engineered solution (check valve, “overpressure device”).

Greetings - Sebastian

On Jul 22, 2019, at 1:26 PM, Carlos Ayerbe Gayoso <gayoso at jlab.org<mailto:gayoso at jlab.org>> wrote:

Hi Bob,

I apologize for the delay, my answer in the middle

________________________________
From: Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org>>
Sent: Monday, July 15, 2019 4:07 PM
To: Carlos Ayerbe Gayoso <gayoso at jlab.org<mailto:gayoso at jlab.org>>
Subject: Re: Fw: BONuS Gas port map

Hi Carlos,

I have a few more questions on the Bonus 12 target and detector gas systems:

  1.  DMS

  *   where are the gas connections?

I didn't get direct answer from Nathan, but I understand that you and Cyril saw the DMS in person at ODU. Nevertheless I will continue asking for pictures.

     *   is there a mounting feature on the detector, or will it sit on a shelf?

It could be sit on a shelf

     *   is there any radiation shielding required?

No, since the aluminium thickness is enough to stop the beta particles from the sources.

     *   what is the maximum internal pressure allowed?  The system currently has a 1 psi check valve to act as a relief valve; is the 1 psi acceptable?

1 psi is definitely acceptable, but the check valve which was originally set, was removed and just added more oil to the bubbler (Sebastian)

  1.  RTPC
     *   what is the expected operating pressure in the buffer and RTPC volumes?

The operating pressure should be 1 atm limited by the fraction of 1" water column in the bubbler. That is required for buffer and RTPC volumes. In fact, contrary to what is expected, the buffer volume pressure at max should be the same at the RTPC (drift) volume, but never higher than the RTPC volume pressure.

     *   what is the maximum pressure in these volumes?  An over pressure device will be added to protect the detector

There is not a maximum pressure known for the RTPC, but everybody agrees that keeping close to 1 atm + epsilon is the safest procedure.,

Regards,
Bob

On 6/20/2019 4:04 PM, Carlos Ayerbe Gayoso wrote:
Hi Bob,

attached is the very preliminary manual I've been writing. It needs to update the latest modifications on the gas panel. I don't have the numbers you are asking me, so I'm cc'ing to the DSG and Bill Crahen. I think they can provide the numbers you need.

I appreciate the firm sentence about the fittings. I was pursuing any confirmation about it.

Thank you very much.

-Carlos
________________________________
From: Bob Miller <rmiller at jlab.org><mailto:rmiller at jlab.org>
Sent: Thursday, June 20, 2019 3:12 PM
To: Carlos Ayerbe Gayoso; Sebastian Kuhn
Subject: Re: Fw: BONuS Gas port map

Hi Carlos,

I have reviewed the BONUS design with Cyril and need to review the gas system connections on the detector.

Please send me the detector gas system manual and procedures,  as well as the calculations and requirements for tube size, pressure, and flow for the helium and the helium/CO2 supply and return circuits.

Do not order any fittings until this review is complete.

Regards,
Bob

On 6/7/2019 5:52 PM, Carlos Ayerbe Gayoso wrote:
Hi All,

please find attached the updated layout of the RTPC end cap with the correct labels and what kind of fittings and size, so DSG can order the proper fittings soon (as was requested).

Thanks to Keith Harding for the drawing.

Cheers

-Carlos

________________________________
From: Keith Harding
Sent: Friday, June 7, 2019 11:27 AM
To: Carlos Ayerbe Gayoso
Subject: Re: BONuS Gas port map

Carlos,

I updated the layout with the size and type of fittings as well.

Keith

________________________________
From: Carlos Ayerbe Gayoso
Sent: Wednesday, June 5, 2019 3:26 PM
To: Keith Harding
Subject: Re: BONuS Gas port map

Hi Keith,

people make notice a mistake in the labels (actually wrong term of one of the ports).

The one called "Helium Monitor (to DMS)" should be called "RTPC Pressure Port"

I am sorry, I was not aware about the terms they were using.

Cheers

-Carlos
________________________________
From: Keith Harding
Sent: Wednesday, June 5, 2019 10:50 AM
To: Carlos Ayerbe Gayoso
Subject: BONuS Gas port map

Carlos,
Attached is a PDF of the Gas Port Map we created Monday afternoon. Enjoy! 😊 Let me know if there are any changes to be made.

Cheers,
Keith

--
Bob Miller
Hall B Lead Engineer
Jefferson Lab
757 822-9586

--
Bob Miller
Hall B Lead Engineer
Jefferson Lab
757 822-9586

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