[Dsg-halla_gem] [EXTERNAL] SBS gas distribution rack moved to EEL/125; help setting up?

[jboyd at jlab.org]

Thanks everyone for the replies. I guess we are just using a lot of gas in
this setup. I will wait to see what the readings are once the transducers
are set up. Right now we are flowing only nitrogen however, we will
eventually flow Ar/CO2.

I believe Anu (and Kondo) know the appropriate flow rates that we expect.

Thanks again for the help.

-John

> I'm working on installing the RPi in the EEL. That way we can start
> reading the transducers.
>
> Marc
> ________________________________
> From: Dsg-halla_gem <dsg-halla_gem-bounces at jlab.org> on behalf of George
> Jacobs <jacobsg at jlab.org>
> Sent: Tuesday, September 28, 2021 1:59 PM
> To: Jack Segal <segal at jlab.org>; jboyd at jlab.org <jboyd at jlab.org>
> Cc: dsg-halla_gem at jlab.org <dsg-halla_gem at jlab.org>
> Subject: Re: [Dsg-halla_gem] [EXTERNAL] SBS gas distribution rack moved to
> EEL/125; help setting up?
>
> Jack is correct, these flow meters have limited accuracy only within the
> advertised range of the flow meter. The mass flow transducers are more
> accurate and should be used to determine actual flow rates.
>
> Dwyer RMA 12 ssv - 50sccm-500sccm
> Dwyer RMA 13 ssv - 100sccm-1000sccm
>
>
> --
> George Jacobs
> Jefferson Lab (TJNAF)
> STE 12
> 12000 Jefferson Ave.
> Newport News, VA 23606
> (office) 757-269-7021
> (email) jacobsg at jlab.org
> (url) https://userweb.jlab.org/~jacobsg
>
>
> ________________________________
> From: Dsg-halla_gem <dsg-halla_gem-bounces at jlab.org> on behalf of Jack
> Segal <segal at jlab.org>
> Sent: Tuesday, September 28, 2021 1:22 PM
> To: jboyd at jlab.org <jboyd at jlab.org>
> Cc: dsg-halla_gem at jlab.org <dsg-halla_gem at jlab.org>
> Subject: Re: [Dsg-halla_gem] [EXTERNAL] SBS gas distribution rack moved to
> EEL/125; help setting up?
>
>    I turned off all the flow meters. Turned them on a section at a time. I
> think you
> are just using a lot of gas. I'm not sure how accurate those visual meters
> are at
> low flow. Also, they are calibrated for air. You are using Ar/CO2.
>    What is the make and model of the visual flow meters?
>
> On 9/28/2021 12:46 PM, Jack Segal wrote:
>> Isolate the GEMs and restart flow one at a time.
>>
>> Sent from my iPhone
>>
>>> On Sep 28, 2021, at 11:39 AM, jboyd at jlab.org wrote:
>>>
>>> To all,
>>>
>>> Anu and I set up the gas distribution from the gas cylinders, to
>>> through
>>> the gas rack, and onto the GEM layers. We have been flushing and
>>> flowing
>>> gas. It seems that the gas loss rate is a bit more than what we would
>>> expect given the flow rates that we have set. We are losing about a
>>> bottle
>>> a day for our 8 layers of GEMs. We expect that 1 bottle should be about
>>> 3+
>>> days.
>>>
>>> Therefore, we are suspecting a leak somewhere, perhaps on the gas
>>> distribution rack. I checked around the gas cylinders and the
>>> connection
>>> manifold and couldn't find any leaks (I did find one but I was able to
>>> fix/seal it).
>>>
>>> What should we do about getting the setup of the gas rack and possibly
>>> the
>>> cylinder/manifold setup leak tested and checked?
>>>
>>> Thank you for the help.
>>>
>>> Best,
>>>
>>> John
>>>
>>>> Hi Brad,
>>>>
>>>> We discussed the SBS gas distribution in our meeting today. I will
>>>> schedule a time to come over and install a Raspberry Pi in area for
>>>> monitoring.
>>>>
>>>> It looks like the rack accessory box has been relocated from the Hall
>>>> to
>>>> EEL 125, George is scheduling to connect the gas flow sensor chassis
>>>> channels to the appropriate flow meters.
>>>>
>>>> After these steps are completed, I'll send an email so Kondo's group
>>>> can
>>>> connect their detector gas lines to the output side of the gas flow
>>>> sensor
>>>> chassis and hook up the premix bottle to the regulator input.
>>>>
>>>>
>>>>
>>>> Regards,
>>>> Marc McMullen
>>>> Sr. Instrumentation Designer
>>>> Detector Support Group
>>>> (757) 269-7738
>>>>
>>>> From: Brad Sawatzky<mailto:brads at jlab.org>
>>>> Sent: Tuesday, September 21, 2021 10:51 PM
>>>> To: Kondo Gnanvo<mailto:kagnanvo at jlab.org>; John
>>>> Boyd<mailto:jboyd at jlab.org>; Rathnayake, Anuruddha
>>>> (adr4zs)<mailto:adr4zs at virginia.edu>; Marc
>>>> Mcmullen<mailto:mcmullen at jlab.org>
>>>> Cc: dsg-halla_gem at jlab.org<mailto:dsg-halla_gem at jlab.org>; Jack
>>>> Segal<mailto:segal at jlab.org>
>>>> Subject: [EXTERNAL] SBS gas distribution rack moved to EEL/125; help
>>>> setting up?
>>>>
>>>> Hi Marc, et al,
>>>>
>>>> The SBS GEM gas distribution rack was recently moved to EEL/125.
>>>> That is where the SBS GEM layers are being stored and worked on.
>>>>
>>>> Marc, can your group support the GEM group in completing the setup
>>>> of that gas system so they can start flowing gas to the layers in
>>>> EEL/125?  It will need to be reconnected to the network, some gas
>>>> line
>>>> 'jumpers' need to be run between the two sides of the rack, and lines
>>>> need to be run from the rack to the GEM modules themselves.  (I
>>>> believe
>>>> Jack fixed the issue with i2c multiplexing in that rack.)
>>>>
>>>> I also moved a large spool of 1/4" poly into EEL/125 so fresh gas
>>>> lines
>>>> can be run.  General consensus is to position the rack in the most
>>>> convenient location in EEL/125 and run (relatively short) gas lines
>>>> of
>>>> the needed length to the individual GEM modules.  We will cut a set
>>>> of
>>>> new (longer) gas lines for the final setup in the Hall in a couple
>>>> months.
>>>>
>>>> I'll be out of town for about a week, but I've discussed this with
>>>> John
>>>> Boyd and Anuruddha, and they are generally in either EEL/125 or /126.
>>>>
>>>> -- Brad
>>>>
>>>> --
>>>> Brad Sawatzky (he/him), PhD <brads at jlab.org> -<>- Jefferson Lab/ Hall
>>>> C/C111
>>>> Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager:
>>>> brads-page at jlab.org
>>>> The most exciting phrase to hear in science, the one that heralds new
>>>>   discoveries, is not "Eureka!" but "That's funny..."   -- Isaac
>>>> Asimov
>>>>
>>>>
>>>
>>>
>
> --
> John(Jack) Segal
> Halls A and C Spectrometer Support Manager
> Thomas Jefferson National Accelerator Facility
> 12000 Jefferson Avenue
> Suite 12
> Newport News, VA 23606-4486
> Phone: (757) 269-7242
> Cell: (757) 320-9977
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