[Sbs_gems] [EXTERNAL] Re: [Fwd: path to GEM checkout]

Sat Oct 30 17:18:06 EDT 2021

Hi John and Anu,
Thank for performing the tests. This is great to know that there was no damage to the chambers.
I don’t think that additional test with Ar-CO2 is necessary, because the main point was to ensure that no damage was done to the structure of the chambers

Best regards
Kondo

From: Sbs_gems <sbs_gems-bounces at jlab.org> On Behalf Of Anuruddha Rathnayake
Sent: Saturday, October 30, 2021 5:08 PM
To: efuchey at jlab.org
Cc: sbs_gems at jlab.org; Huong Nguyen <htn3r.uva at gmail.com>
Subject: Re: [Sbs_gems] [EXTERNAL] Re: [Fwd: path to GEM checkout]

Hi All,

Please see the attached log entry for details of the test we just did/doing (HV will stay on overnight like John mentioned)

https://logbooks.jlab.org/entry/3935002

Eric: That sounds good. We will make sure to turn HV off before 7:30 am Monday and we will let you know once HV is off.

Best,
Anu

On Sat, Oct 30, 2021 at 4:55 PM Eric Fuchey <efuchey at jlab.org<mailto:efuchey at jlab.org>> wrote:
Hi John, and all,

as far as I am concerned, it's all good as long as the HV gets turned off
before Jessie and his team get back to work in the hall on Monday 8am.
So I want to see your plan provisioning someone to stop the DAQ GEMs HVs
by  7:30am at the latest on Monday.

Best,
Eric

> We have conducted the HV tests on all of the GEMs. We did a slow voltage
> ramp up on each module/layer independently and held it at that maximum
> voltage while we inspected for anything unusual (fluctuating current,
> audible/visible sparks, etc.). No GEMs showed any unusual operation or
> raised any points of concern about their well-being. From the HV test
> standpoint, they seem to be okay.
>
> We will continue this inspection by holding HV overnight while monitoring
> the currents.
>
> Before moving on from the overnight HV hold I wanted to get confirmation
> on
> the next steps. If all goes well with the HV hold, should we then switch
> over to Ar/CO2 in the morning and run cosmics starting tomorrow evening?
>
> If this seems like a reasonable plan then that will be what we work
> towards. If not, then please advise.
>
> Best regards,
>
> John Boyd
>
> On Sat, Oct 30, 2021 at 1:48 PM Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu<mailto:kg6cq at virginia.edu>>
> wrote:
>
>> Sorry John,
>>
>> I meant to say less flexibility on Monday at 2 pm, giving the fact that
>> you might have time restriction for the test because of Jessieâ€™s crew
>> more
>> important work schedule
>>
>> Best John
>>
>>
>>
>> *From:* John Boyd <johnaboyd3 at gmail.com<mailto:johnaboyd3 at gmail.com>>
>> *Sent:* Saturday, October 30, 2021 11:40 AM
>> *To:* Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu<mailto:kg6cq at virginia.edu>>; Liyanage, Nilanga K
>> (nl8n) <nl8n at virginia.edu<mailto:nl8n at virginia.edu>>; sbs_gems at jlab.org<mailto:sbs_gems at jlab.org>; Huong Nguyen <
>> htn3r.uva at gmail.com<mailto:htn3r.uva at gmail.com>>; efuchey at jlab.org<mailto:efuchey at jlab.org>
>> *Subject:* Re: [Sbs_gems] [Fwd: path to GEM checkout]
>>
>>
>>
>> Thank you for the response. We will plan to give them a look in a few
>> hours. I am copying the RC (Eric Fuchey) on this email. We are
>> coordinating
>> with him and the INFN team to settle out the details. We will keep
>> everyone
>> updated & informed.
>>
>>
>>
>> Best,
>>
>>
>>
>> John
>>
>>
>>
>> On Sat, Oct 30, 2021 at 10:53 AM Gnanvo, Kondo (kg6cq)
>> <kg6cq at virginia.edu<mailto:kg6cq at virginia.edu>>
>> wrote:
>>
>> Hi John,
>>
>> In my opinion, it is a good idea to conduct this test this weekend if
>> you
>> are available to do so, including Anu.
>>
>>
>>
>> If you decide to do so, inform us and more importantly, keep in mind
>> that
>> the first UV GEM, closer to BB has the modified divider (R4 changed to
>> .5M)
>> therefore the HV should follow
>>
>>
>>
>> Also, ideally all layers need to be tested, so you might also keep Holly
>> and Zeke in the loop about what their plan is.
>>
>>
>>
>> There will probably be less flexibility (time) to do a thorough test
>> tomorrow
>>
>>
>>
>> Best regards
>>
>> Kondo
>>
>>
>> ------------------------------
>>
>> *From:* John Boyd <johnaboyd3 at gmail.com<mailto:johnaboyd3 at gmail.com>>
>> *Sent:* Saturday, October 30, 2021 8:08 AM
>> *To:* Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu<mailto:nl8n at virginia.edu>>; Gnanvo, Kondo
>> (kg6cq) <kg6cq at virginia.edu<mailto:kg6cq at virginia.edu>>; Huong Nguyen <htn3r.uva at gmail.com<mailto:htn3r.uva at gmail.com>>;
>> sbs_gems at jlab.org<mailto:sbs_gems at jlab.org> <sbs_gems at jlab.org<mailto:sbs_gems at jlab.org>>
>> *Subject:* Fwd: [Sbs_gems] [Fwd: path to GEM checkout]
>>
>>
>>
>> In my email yesterday about whether or not to conduct the GEM test this
>> weekend I forgot to include the email from the RC about options and
>> availability for testing the GEMs.
>>
>>
>>
>> It is forwarded here in this email.
>>
>>
>>
>> Best,
>>
>>
>>
>> John
>>
>>
>>
>> ---------- Forwarded message ---------
>> From: *Eric Fuchey* <efuchey at jlab.org<mailto:efuchey at jlab.org>>
>> Date: Sat, Oct 30, 2021, 7:24 AM
>> Subject: [Sbs_gems] [Fwd: path to GEM checkout]
>> To: <sbs_gems at jlab.org<mailto:sbs_gems at jlab.org>>
>>
>>
>>
>> Here is this email forwarded to sbs_gems at jlab.org<mailto:sbs_gems at jlab.org>
>> to summarize:
>> the best time to checkout the GEMs is either this weekend, presumably at
>> any time (unless Jessie warns me of any change of plans) OR Monday
>> around
>> 2pm.
>> Eric
>>
>> ---------------------------- Original Message
>> ----------------------------
>> Subject: path to GEM checkout
>> From:    "Eric Fuchey" <efuchey at jlab.org<mailto:efuchey at jlab.org>>
>> Date:    Fri, October 29, 2021 5:42 pm
>> To:      gautam at jlab.org<mailto:gautam at jlab.org>
>>          adr at jlab.org<mailto:adr at jlab.org>
>>          ewertz at jlab.org<mailto:ewertz at jlab.org>
>>          jboyd at jlab.org<mailto:jboyd at jlab.org>
>>          jeffas at jlab.org<mailto:jeffas at jlab.org>
>>          hszumila at jlab.org<mailto:hszumila at jlab.org>
>>          kagnanvo at jlab.org<mailto:kagnanvo at jlab.org>
>> Cc:      jbutler at jlab.org<mailto:jbutler at jlab.org>
>> --------------------------------------------------------------------------
>>
>> Dear GEM experts,
>>
>> I'm reaching out to you as I know you want to check out the GEMs after
>> the
>> hall incidents.
>>
>> As per Jessie's input (and please Jessie correct me if I'm wrong), a
>> good
>> moment to check out your detector is sometimes this weekend e.g.
>> tomorrow,
>> as he and his team won't be around (unless something changes and he and
>> his team need to go work in the hall this weekend in which case he will
>> warn me.
>>
>> *if that cannot happen this weekend* a right moment to check the GEM out
>> would be around 2pm on Monday when they are pausing on-going work in the
>> hall, so you can coordinate with them;
>>
>> Either way *please warn me ahead of time* when you decide to check the
>> GEMs, just so that I can, if need be, coordinate with Jessie.
>>
>> Best,
>> Eric
>>
>> PS: I'm not entirely sure who in the group is supposed to take care of
>> this task, so I included as many GEM people as possible.
>>
>>
>>
>>
>> --
>> Eric FUCHEY
>>
>>
>>
>>
>>
>> --
>> Eric FUCHEY
>>
>>
>> _______________________________________________
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>> Sbs_gems at jlab.org<mailto:Sbs_gems at jlab.org>
>> https://mailman.jlab.org/mailman/listinfo/sbs_gems
>>
>>
>

--
Eric FUCHEY

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