<div dir="ltr"><div>Yeah, this is relieving in many regards. <br></div><div><br></div><div>The thought behind doing the test with Ar/CO2 was based on something Nilanga had mentioned in the GEM meeting (I believe it was a GEM meeting) last week. He mentioned running a cosmic test and then looking at the cluster sizes to make sure that everything seems correct. There isn't too too much effort involved in switching things over to run the cosmic tests and we should be able to collect enough data before shutting everything back down 8 AM Monday morning. But, if it decidedly not necessary then we will not go through that.</div><div><br></div><div>Thanks,</div><div><br></div><div>John<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Oct 30, 2021 at 5:18 PM Gnanvo, Kondo (kg6cq) <<a href="mailto:kg6cq@virginia.edu">kg6cq@virginia.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang="EN-US">
<div class="gmail-m_-1320056546737851775WordSection1">
<p class="MsoNormal">Hi John and Anu, <u></u><u></u></p>
<p class="MsoNormal">Thank for performing the tests. This is great to know that there was no damage to the chambers.
<u></u><u></u></p>
<p class="MsoNormal">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
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Best regards <u></u><u></u></p>
<p class="MsoNormal">Kondo<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b>From:</b> Sbs_gems <<a href="mailto:sbs_gems-bounces@jlab.org" target="_blank">sbs_gems-bounces@jlab.org</a>> <b>On Behalf Of
</b>Anuruddha Rathnayake<br>
<b>Sent:</b> Saturday, October 30, 2021 5:08 PM<br>
<b>To:</b> <a href="mailto:efuchey@jlab.org" target="_blank">efuchey@jlab.org</a><br>
<b>Cc:</b> <a href="mailto:sbs_gems@jlab.org" target="_blank">sbs_gems@jlab.org</a>; Huong Nguyen <<a href="mailto:htn3r.uva@gmail.com" target="_blank">htn3r.uva@gmail.com</a>><br>
<b>Subject:</b> Re: [Sbs_gems] [EXTERNAL] Re: [Fwd: path to GEM checkout]<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">Hi All,<br>
<br>
Please see the attached log entry for details of the test we just did/doing (HV will stay on overnight like John mentioned)<br>
<br>
<a href="https://logbooks.jlab.org/entry/3935002" target="_blank">https://logbooks.jlab.org/entry/3935002</a><u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">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.<br>
<br>
Best,<br>
Anu<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">On Sat, Oct 30, 2021 at 4:55 PM Eric Fuchey <<a href="mailto:efuchey@jlab.org" target="_blank">efuchey@jlab.org</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style="border-color:currentcolor currentcolor currentcolor rgb(204,204,204);border-style:none none none solid;border-width:medium medium medium 1pt;padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
<p class="MsoNormal">Hi John, and all,<br>
<br>
as far as I am concerned, it's all good as long as the HV gets turned off<br>
before Jessie and his team get back to work in the hall on Monday 8am.<br>
So I want to see your plan provisioning someone to stop the DAQ GEMs HVs<br>
by 7:30am at the latest on Monday.<br>
<br>
Best,<br>
Eric<br>
<br>
> We have conducted the HV tests on all of the GEMs. We did a slow voltage<br>
> ramp up on each module/layer independently and held it at that maximum<br>
> voltage while we inspected for anything unusual (fluctuating current,<br>
> audible/visible sparks, etc.). No GEMs showed any unusual operation or<br>
> raised any points of concern about their well-being. From the HV test<br>
> standpoint, they seem to be okay.<br>
><br>
> We will continue this inspection by holding HV overnight while monitoring<br>
> the currents.<br>
><br>
> Before moving on from the overnight HV hold I wanted to get confirmation<br>
> on<br>
> the next steps. If all goes well with the HV hold, should we then switch<br>
> over to Ar/CO2 in the morning and run cosmics starting tomorrow evening?<br>
><br>
> If this seems like a reasonable plan then that will be what we work<br>
> towards. If not, then please advise.<br>
><br>
> Best regards,<br>
><br>
> John Boyd<br>
><br>
> On Sat, Oct 30, 2021 at 1:48 PM Gnanvo, Kondo (kg6cq) <<a href="mailto:kg6cq@virginia.edu" target="_blank">kg6cq@virginia.edu</a>><br>
> wrote:<br>
><br>
>> Sorry John,<br>
>><br>
>> I meant to say less flexibility on Monday at 2 pm, giving the fact that<br>
>> you might have time restriction for the test because of Jessie’s crew<br>
>> more<br>
>> important work schedule<br>
>><br>
>> Best John<br>
>><br>
>><br>
>><br>
>> *From:* John Boyd <<a href="mailto:johnaboyd3@gmail.com" target="_blank">johnaboyd3@gmail.com</a>><br>
>> *Sent:* Saturday, October 30, 2021 11:40 AM<br>
>> *To:* Gnanvo, Kondo (kg6cq) <<a href="mailto:kg6cq@virginia.edu" target="_blank">kg6cq@virginia.edu</a>>; Liyanage, Nilanga K<br>
>> (nl8n) <<a href="mailto:nl8n@virginia.edu" target="_blank">nl8n@virginia.edu</a>>;
<a href="mailto:sbs_gems@jlab.org" target="_blank">sbs_gems@jlab.org</a>; Huong Nguyen <<br>
>> <a href="mailto:htn3r.uva@gmail.com" target="_blank">htn3r.uva@gmail.com</a>>;
<a href="mailto:efuchey@jlab.org" target="_blank">efuchey@jlab.org</a><br>
>> *Subject:* Re: [Sbs_gems] [Fwd: path to GEM checkout]<br>
>><br>
>><br>
>><br>
>> Thank you for the response. We will plan to give them a look in a few<br>
>> hours. I am copying the RC (Eric Fuchey) on this email. We are<br>
>> coordinating<br>
>> with him and the INFN team to settle out the details. We will keep<br>
>> everyone<br>
>> updated & informed.<br>
>><br>
>><br>
>><br>
>> Best,<br>
>><br>
>><br>
>><br>
>> John<br>
>><br>
>><br>
>><br>
>> On Sat, Oct 30, 2021 at 10:53 AM Gnanvo, Kondo (kg6cq)<br>
>> <<a href="mailto:kg6cq@virginia.edu" target="_blank">kg6cq@virginia.edu</a>><br>
>> wrote:<br>
>><br>
>> Hi John,<br>
>><br>
>> In my opinion, it is a good idea to conduct this test this weekend if<br>
>> you<br>
>> are available to do so, including Anu.<br>
>><br>
>><br>
>><br>
>> If you decide to do so, inform us and more importantly, keep in mind<br>
>> that<br>
>> the first UV GEM, closer to BB has the modified divider (R4 changed to<br>
>> .5M)<br>
>> therefore the HV should follow<br>
>><br>
>><br>
>><br>
>> Also, ideally all layers need to be tested, so you might also keep Holly<br>
>> and Zeke in the loop about what their plan is.<br>
>><br>
>><br>
>><br>
>> There will probably be less flexibility (time) to do a thorough test<br>
>> tomorrow<br>
>><br>
>><br>
>><br>
>> Best regards<br>
>><br>
>> Kondo<br>
>><br>
>><br>
>> ------------------------------<br>
>><br>
>> *From:* John Boyd <<a href="mailto:johnaboyd3@gmail.com" target="_blank">johnaboyd3@gmail.com</a>><br>
>> *Sent:* Saturday, October 30, 2021 8:08 AM<br>
>> *To:* Liyanage, Nilanga K (nl8n) <<a href="mailto:nl8n@virginia.edu" target="_blank">nl8n@virginia.edu</a>>; Gnanvo, Kondo<br>
>> (kg6cq) <<a href="mailto:kg6cq@virginia.edu" target="_blank">kg6cq@virginia.edu</a>>; Huong Nguyen <<a href="mailto:htn3r.uva@gmail.com" target="_blank">htn3r.uva@gmail.com</a>>;<br>
>> <a href="mailto:sbs_gems@jlab.org" target="_blank">sbs_gems@jlab.org</a> <<a href="mailto:sbs_gems@jlab.org" target="_blank">sbs_gems@jlab.org</a>><br>
>> *Subject:* Fwd: [Sbs_gems] [Fwd: path to GEM checkout]<br>
>><br>
>><br>
>><br>
>> In my email yesterday about whether or not to conduct the GEM test this<br>
>> weekend I forgot to include the email from the RC about options and<br>
>> availability for testing the GEMs.<br>
>><br>
>><br>
>><br>
>> It is forwarded here in this email.<br>
>><br>
>><br>
>><br>
>> Best,<br>
>><br>
>><br>
>><br>
>> John<br>
>><br>
>><br>
>><br>
>> ---------- Forwarded message ---------<br>
>> From: *Eric Fuchey* <<a href="mailto:efuchey@jlab.org" target="_blank">efuchey@jlab.org</a>><br>
>> Date: Sat, Oct 30, 2021, 7:24 AM<br>
>> Subject: [Sbs_gems] [Fwd: path to GEM checkout]<br>
>> To: <<a href="mailto:sbs_gems@jlab.org" target="_blank">sbs_gems@jlab.org</a>><br>
>><br>
>><br>
>><br>
>> Here is this email forwarded to <a href="mailto:sbs_gems@jlab.org" target="_blank">
sbs_gems@jlab.org</a><br>
>> to summarize:<br>
>> the best time to checkout the GEMs is either this weekend, presumably at<br>
>> any time (unless Jessie warns me of any change of plans) OR Monday<br>
>> around<br>
>> 2pm.<br>
>> Eric<br>
>><br>
>> ---------------------------- Original Message<br>
>> ----------------------------<br>
>> Subject: path to GEM checkout<br>
>> From: "Eric Fuchey" <<a href="mailto:efuchey@jlab.org" target="_blank">efuchey@jlab.org</a>><br>
>> Date: Fri, October 29, 2021 5:42 pm<br>
>> To: <a href="mailto:gautam@jlab.org" target="_blank">gautam@jlab.org</a><br>
>> <a href="mailto:adr@jlab.org" target="_blank">adr@jlab.org</a><br>
>> <a href="mailto:ewertz@jlab.org" target="_blank">ewertz@jlab.org</a><br>
>> <a href="mailto:jboyd@jlab.org" target="_blank">jboyd@jlab.org</a><br>
>> <a href="mailto:jeffas@jlab.org" target="_blank">jeffas@jlab.org</a><br>
>> <a href="mailto:hszumila@jlab.org" target="_blank">hszumila@jlab.org</a><br>
>> <a href="mailto:kagnanvo@jlab.org" target="_blank">kagnanvo@jlab.org</a><br>
>> Cc: <a href="mailto:jbutler@jlab.org" target="_blank">jbutler@jlab.org</a><br>
>> --------------------------------------------------------------------------<br>
>><br>
>> Dear GEM experts,<br>
>><br>
>> I'm reaching out to you as I know you want to check out the GEMs after<br>
>> the<br>
>> hall incidents.<br>
>><br>
>> As per Jessie's input (and please Jessie correct me if I'm wrong), a<br>
>> good<br>
>> moment to check out your detector is sometimes this weekend e.g.<br>
>> tomorrow,<br>
>> as he and his team won't be around (unless something changes and he and<br>
>> his team need to go work in the hall this weekend in which case he will<br>
>> warn me.<br>
>><br>
>> *if that cannot happen this weekend* a right moment to check the GEM out<br>
>> would be around 2pm on Monday when they are pausing on-going work in the<br>
>> hall, so you can coordinate with them;<br>
>><br>
>> Either way *please warn me ahead of time* when you decide to check the<br>
>> GEMs, just so that I can, if need be, coordinate with Jessie.<br>
>><br>
>> Best,<br>
>> Eric<br>
>><br>
>> PS: I'm not entirely sure who in the group is supposed to take care of<br>
>> this task, so I included as many GEM people as possible.<br>
>><br>
>><br>
>><br>
>><br>
>> --<br>
>> Eric FUCHEY<br>
>><br>
>><br>
>><br>
>><br>
>><br>
>> --<br>
>> Eric FUCHEY<br>
>><br>
>><br>
>> _______________________________________________<br>
>> Sbs_gems mailing list<br>
>> <a href="mailto:Sbs_gems@jlab.org" target="_blank">Sbs_gems@jlab.org</a><br>
>> <a href="https://mailman.jlab.org/mailman/listinfo/sbs_gems" target="_blank">https://mailman.jlab.org/mailman/listinfo/sbs_gems</a><br>
>><br>
>><br>
><br>
<br>
<br>
-- <br>
Eric FUCHEY<br>
<br>
<br>
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