[Dsg-hallb_prad_ii] Fw: New Gas System for Prad GEMS to run this year.

Marc Mcmullen mcmullen at jlab.org
Thu Dec 11 10:32:38 EST 2025 

________________________________
From: Marc Mcmullen <mcmullen at jlab.org>
Sent: Thursday, December 11, 2025 10:23 AM
To: Bob Miller <rmiller at jlab.org>
Cc: Brian Eng <beng at jlab.org>; Denny Insley <dinsley at jlab.org>; dsg_hallb-prad_ii at jlab.org <dsg_hallb-prad_ii at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Bob,

Thanks for the update. We will add it to the schedule and update you with the progress.


Regards,
Marc
________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Thursday, December 11, 2025 9:39 AM
To: Marc Mcmullen <mcmullen at jlab.org>
Cc: Brian Eng <beng at jlab.org>; Denny Insley <dinsley at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Marc,

I just received the new MFC and installed it yesterday.

Mix 2 will still be used as is for the MVT.

Mix 1 will now be used for the Prad GEM detectors.  They will flow a maximum of 2 lpm.  The mix will be 70/30 argon/CO2 or 70/28/2 argon/CO2/isobutane.

They would like to test in the Hall with this gas system in mid January.

Please let me know if you can set up the controls by then and if you need any support from Hall B.

Thanks,

Bob Miller
Hall B Lead Engineer
(757) 822-9586
________________________________
From: Marc Mcmullen <mcmullen at jlab.org>
Sent: Thursday, August 14, 2025 2:56 PM
To: Bob Miller <rmiller at jlab.org>; Brian Eng <beng at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Thanks Bob,

We will review it and let you know if we have questions.

Marc
________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Thursday, August 14, 2025 2:55 PM
To: Marc Mcmullen <mcmullen at jlab.org>; Brian Eng <beng at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Marc,

Here is the latest P&IDs for this alteration.

The changes from MVT are that Mix 1 will use CO2 with a 2000 sccm MFC in place of CF4 that used a 200 sccm MFC.  Mix 2 will still operate as normal.

Thanks,

Bob Miller
Hall B Lead Engineer
(757) 822-9586
________________________________
From: Marc Mcmullen <mcmullen at jlab.org>
Sent: Tuesday, August 12, 2025 3:52 PM
To: Brian Eng <beng at jlab.org>; Bob Miller <rmiller at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Bob,

I have started reviewing your P&I, and I talked with Brian. I think we are just planning on updating the MVT GUI and update the networking information for the new MFC.

Did you and Brian come up with a solution for the MFC, if so did it get ordered.

Thanks,
Marc
________________________________
From: Brian Eng <beng at jlab.org>
Sent: Wednesday, August 6, 2025 10:59 AM
To: Bob Miller <rmiller at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Ok, the flow rate itself doesn’t really matter from the controls prospective.

Just keep in mind that the minimum flow is based on the full scale maximum. On the MKS ones a 2 slm will have a minimum of 30 sccm versus 15 sccm for a 1 slm one.

I know we’ve had issues when they set the overall flow too low, which means the individual gas mixes are flowing even less.

________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Wednesday, August 6, 2025 10:51:08 AM
To: Brian Eng <beng at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Brian,

I would like to get the same model MKS but rated for 2000 sccm of N2.  It will meet our needs for this experiment and be a spare for the argon MFCs in the future.

Bob Miller
Hall B Lead Engineer
(757) 822-9586

________________________________
From: Brian Eng <beng at jlab.org>
Sent: Wednesday, August 6, 2025 10:47 AM
To: Bob Miller <rmiller at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Bob,

If you just wanted to get the same model MKS but rated for 1000 sccm of N2 that’d be fine for the controls as it’d be no changes on our side.

If there’s pricing or lead time issues with MKS we can look at getting an Alicat one (same as used for BoNuS). I’d only do this as a backup as it’s both code changes (with are fairly straightforward) but those haven’t been run “outside” like the MKS.

________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Wednesday, August 6, 2025 9:24:26 AM
To: Marc Mcmullen <mcmullen at jlab.org>
Cc: Brian Eng <beng at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.


Hi Marc,

Here is the info for the MVT mixing system argon MFC.

We need an MFC to flow 600 sccm CO2 (728 sccm N2) for the GEM detectors for the PRad experiment starting in January.  I assume we will buy the same model as the current argon MFC to use for CO2.  This will replace MFC-CF-01 in the MVT mixing system.

If you concur, I will order and install the MFC and let you know when it is ready to update the controls.

Thanks,
Bob











[cid:dbbe2c70-5d6e-44a3-b58e-e87aebe659ad]
[cid:e1844ecb-6b5a-40cd-a3eb-4fce9da72fa9]






Bob Miller
Hall B Lead Engineer
(757) 822-9586

________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Friday, August 1, 2025 10:22 AM
To: Brian Eng <beng at jlab.org>
Cc: Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.


Hi Brian,

I think we just need another MFC1 to replace the MFC4.

Early next week, I will verify the MFC part number and check with Marc before ordering one.

Thanks,
Bob


Component Label
Component description
Part Number
Pressure Rating
Mass Flow Controllers
MFC1
MKS GM50A, 0-2000 sccm, 1/4" Swagelok, Analog 0 to 5 VDC (15 pin D connector) argon supply
MKS TYPE GM50A004203SBM020
1000 psi
MFC2
MKS GM50A, 0-200 sccm, 1/4" Swagelok, Analog 0 to 5 VDC (15 pin D connector) isobutane supply
MKS TYPE GM50A111202SBM020
1000 psi
MFC3
MKS GM50A, 0-200 sccm, 1/4" Swagelok, Analog 0 to 5 VDC (15 pin D connector) isobutane supply
MKS TYPE GM50A004203SBM020
1000 psi
MFC4
MKS GM50A, 0-200 sccm, 1/4" Swagelok, Analog 0 to 5 VDC (15 pin D connector) CF4 supply
MKS TYPE GM50A111202SBM020
1000 psi
MFC5
MKS GM50A, 0-2000 sccm, 1/4" Swagelok, Analog 0 to 5 VDC (15 pin D connector) argon supply
MKS TYPE GM50A063102SBM020
1000 psi



Bob Miller
Hall B Lead Engineer
(757) 822-9586
________________________________
From: Brian Eng <beng at jlab.org>
Sent: Friday, August 1, 2025 9:57 AM
To: Bob Miller <rmiller at jlab.org>
Cc: Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Bob,

Marc would handle any software changes that need to be done, but it isn't clear what that would actually be as it seems like the current system does what you want albeit with just different gases.

Seems like it is just changing a MFC to a slightly larger one, which we don't have. Do we need to order it? Once Hall B Techs have it swapped out Marc can get it online and into the system.

We can meet next week if there is some other changes that we're just missed that would take more than an email.

________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Thursday, July 31, 2025 6:54 AM
To: Brian Eng <beng at jlab.org>
Cc: Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Brian,

Do you have any update on this?

Bob Miller
Hall B Lead Engineer
(757) 822-9586
________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Monday, July 21, 2025 1:01 PM
To: Brian Eng <beng at jlab.org>
Cc: Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Brian,

The gas system has been simplified quite a bit.  We will alter the MVT mixing system on the gas pad to supply argon/co2, and distribute the gas to each GEM with manual rotameters.

The MVT mixing system will supply the GEMs using mix 1.  MFC-CF-01 will need to be replaced with a larger one for CO2, while MFC-AR-01 will supply the argon.  The CO2 requirement is 600 sccm, or 728 sccm N2 equivalent.

Mix 2 will stay intact to use for MVT testing.

This alteration should take place in Sep-Oct in order to use the gas system in November.

Do you have a larger MFC?  Who can work on the controls to set this up?

We can meet to discuss the details if you like.

Thanks,

Bob Miller
Hall B Lead Engineer
(757) 822-9586
________________________________
From: Brian Eng <beng at jlab.org>
Sent: Friday, March 7, 2025 2:12 PM
To: Bob Miller <rmiller at jlab.org>
Cc: Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

At least the picture of FT190 is just a MFM according to the model number, so only does readout.

It looks like FCV104/204 are the ones that actually control the flow. There's also some other valves that probably need to be controlled to actually get flow, i.e. FV101/201.

What controls are there to change? We've never done anything with this system. I'm sure someone could swap out the MFM for larger ones and change whatever is (but I have no clue what this actually is) monitoring the sensors to the new scale to get a correct readout.



If PRad doesn't need remote control of the flow, we could setup what the Hall A/C GEMS are using which is fairly inexpensive.

________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Friday, March 7, 2025 1:05 PM
To: Brian Eng <beng at jlab.org>
Cc: Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

Hi Brian,

I may be able to use the MVT gas distribution system for the upcoming PRad GEMs.  The distribution system was supplied by Saclay.  If we change the Brooks MFC to a larger one, can you change the controls to make it work?

The MVT gas mixing system was designed by JLab and will be used also, but the distribution system is different.

Thanks,


Bob Miller
Hall B Lead Engineer
(757) 822-9586
________________________________
From: Brian Eng <beng at jlab.org>
Sent: Monday, February 10, 2025 10:44 AM
To: Bob Miller <rmiller at jlab.org>
Subject: Re: New Gas System for Prad GEMS to run this year.

When would they start and when is it needed by?

I’m guessing this is a different group than the one that is involved with getting the target back online?
________________________________
From: Bob Miller <rmiller at jlab.org>
Sent: Monday, February 10, 2025 10:38:47 AM
To: Brian Eng <beng at jlab.org>
Subject: New Gas System for Prad GEMS to run this year.

Hi Brian,

I have a request from the PRad run group to build a gas system to supply their GEM detectors.

I may be able to modify the MVT gas mixing and delivery system to use for the GEMS.

Who should I work with on the controls for this system?

Thanks,


Bob Miller
Hall B Lead Engineer
(757) 822-9586
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