<div dir="auto">Hi Nilanga,<div dir="auto"><br></div><div dir="auto">Just to be sure, are you still planning to be in the counting house and guide us during this test?</div><div dir="auto">I will plan to be in the counting house when the test happens.</div><div dir="auto"><br></div><div dir="auto">Best,</div><div dir="auto">Anuruddha </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 7 Feb 2022, 13:05 Liyanage, Nilanga K (nl8n), <<a href="mailto:nl8n@virginia.edu">nl8n@virginia.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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OK sounds good Arun</div>
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I think it would be important to take LH2 or LD2 runs</div>
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Best</div>
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Nilang</div>
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<div id="m_1825829807653952783divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Arun Tadepalli <<a href="mailto:arunts@jlab.org" target="_blank" rel="noreferrer">arunts@jlab.org</a>><br>
<b>Sent:</b> Monday, February 7, 2022 12:28 PM<br>
<b>To:</b> Mark Jones <<a href="mailto:jones@jlab.org" target="_blank" rel="noreferrer">jones@jlab.org</a>><br>
<b>Cc:</b> David Flay <<a href="mailto:flay@jlab.org" target="_blank" rel="noreferrer">flay@jlab.org</a>>; Liyanage, Nilanga K (nl8n) <<a href="mailto:nl8n@virginia.edu" target="_blank" rel="noreferrer">nl8n@virginia.edu</a>>; <a href="mailto:sbs_gems@jlab.org" target="_blank" rel="noreferrer">sbs_gems@jlab.org</a> <<a href="mailto:Sbs_gems@jlab.org" target="_blank" rel="noreferrer">Sbs_gems@jlab.org</a>><br>
<b>Subject:</b> Re: [Sbs_gems] [EXTERNAL] Upper limits in terms of beam current for the GEM study planned for tomorrow</font>
<div> </div>
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<div style="word-wrap:break-word;line-break:after-white-space">Hello Nilanga,
<div><br>
</div>
<div>From negotiations perspective, Hall C is ok bumping down their current to provide us 25 uA and this can happen comfortably. Il bring up the possibility of dummy running to avoid RF trips during this time but even if not, we can get what we ask
for.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Arun<br>
<div><br>
<blockquote type="cite">
<div>On Feb 7, 2022, at 12:24 PM, Mark Jones <<a href="mailto:jones@jlab.org" target="_blank" rel="noreferrer">jones@jlab.org</a>> wrote:</div>
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Since Hall C is at max 70 that is 350 so that leaves 80uA/2pass = 40uA max for</div>
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Hall A. There will probably be more RF trips. So you may want to talk to Hall A</div>
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to see if there is dummy running ( 40uA) needed that could work at that time.</div>
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Cheers,</div>
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Mark</div>
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<font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b><span> </span>Sbs_gems <<a href="mailto:sbs_gems-bounces@jlab.org" target="_blank" rel="noreferrer">sbs_gems-bounces@jlab.org</a>> on behalf of David Flay <<a href="mailto:flay@jlab.org" target="_blank" rel="noreferrer">flay@jlab.org</a>><br>
<b>Sent:</b><span> </span>Monday, February 7, 2022 12:09 PM<br>
<b>To:</b><span> </span>Liyanage, Nilanga K (nl8n) <<a href="mailto:nl8n@virginia.edu" target="_blank" rel="noreferrer">nl8n@virginia.edu</a>>; Arun Tadepalli <<a href="mailto:arunts@jlab.org" target="_blank" rel="noreferrer">arunts@jlab.org</a>><br>
<b>Cc:</b><span> </span><a href="mailto:sbs_gems@jlab.org" target="_blank" rel="noreferrer">sbs_gems@jlab.org</a> <<a href="mailto:Sbs_gems@jlab.org" target="_blank" rel="noreferrer">Sbs_gems@jlab.org</a>><br>
<b>Subject:</b><span> </span>Re: [Sbs_gems] [EXTERNAL] Upper limits in terms of beam current for the GEM study planned for tomorrow</font>
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Hi Nilanga, </div>
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I believe the total current allowed in the machine is 430 uA -- so this accounts for beam passes. In other words, certainly have to negotiate with Hall C depending on where they are in terms of beam-pass. </div>
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Best regards,</div>
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David </div>
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<span style="margin:0px">----------------------------------------------------------------</span></div>
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David Flay, Ph. D.</div>
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Hall A/C Staff Scientist</div>
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Thomas Jefferson National Accelerator Facility</div>
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Office: CEBAF Center, C119</div>
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<div id="m_1825829807653952783x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b><span> </span>Sbs_gems <<a href="mailto:sbs_gems-bounces@jlab.org" target="_blank" rel="noreferrer">sbs_gems-bounces@jlab.org</a>>
on behalf of Liyanage, Nilanga K (nl8n) <<a href="mailto:nl8n@virginia.edu" target="_blank" rel="noreferrer">nl8n@virginia.edu</a>><br>
<b>Sent:</b><span> </span>Monday, February 7, 2022 12:05 PM<br>
<b>To:</b><span> </span>Arun Tadepalli <<a href="mailto:arunts@jlab.org" target="_blank" rel="noreferrer">arunts@jlab.org</a>><br>
<b>Cc:</b><span> </span><a href="mailto:sbs_gems@jlab.org" target="_blank" rel="noreferrer">sbs_gems@jlab.org</a> <<a href="mailto:sbs_gems@jlab.org" target="_blank" rel="noreferrer">sbs_gems@jlab.org</a>><br>
<b>Subject:</b><span> </span>Re: [Sbs_gems] [EXTERNAL] Upper limits in terms of beam current for the GEM study planned for tomorrow</font>
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Hi Arun</div>
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Thanks for that information.</div>
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It is nice to see that we are allowed to go up to 70 uA with the cryo targets.</div>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
But the question is what will hall C be taking during that time ? </div>
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What is the maximum current the accelerator could deliver at this time ?</div>
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If we are going to hit this upper limit of the total current, then you will have to negotiate with Hall C to see if they agree to lower their current for an hour or two while we take out data.</div>
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Best</div>
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<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
Nilanga</div>
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<div id="m_1825829807653952783x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b><span> </span>Arun Tadepalli <<a href="mailto:arunts@jlab.org" target="_blank" rel="noreferrer">arunts@jlab.org</a>><br>
<b>Sent:</b><span> </span>Monday, February 7, 2022 11:59 AM<br>
<b>To:</b><span> </span>Liyanage, Nilanga K (nl8n) <<a href="mailto:nl8n@virginia.edu" target="_blank" rel="noreferrer">nl8n@virginia.edu</a>><br>
<b>Cc:</b><span> </span><a href="mailto:sbs_gems@jlab.org" target="_blank" rel="noreferrer">sbs_gems@jlab.org</a> <<a href="mailto:sbs_gems@jlab.org" target="_blank" rel="noreferrer">sbs_gems@jlab.org</a>><br>
<b>Subject:</b><span> </span>Re: [Sbs_gems] [EXTERNAL] Upper limits in terms of beam current for the GEM study planned for tomorrow</font>
<div> </div>
</div>
<div style="word-wrap:break-word;line-break:after-white-space">Hello GEM folks,
<div><br>
</div>
<div>I sent a snapshot of max current per target as per the OR document. Any update on what current you would like to go to? I’d have to give a heads up to other halls on our plans.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Arun<br>
<div><br>
<blockquote type="cite">
<div>On Feb 6, 2022, at 11:38 PM, Arun Tadepalli <<a href="mailto:arunts@jlab.org" target="_blank" rel="noreferrer">arunts@jlab.org</a>> wrote:</div>
<br>
<div>
<div style="word-wrap:break-word;line-break:after-white-space">Dear Nilanga,
<div><br>
</div>
<div>Please find attached a snapshot from the operational restrictions document for Hall A. It contains the maximum allowable CW current on each target.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Arun</div>
<div><br>
</div>
<div><span id="m_1825829807653952783x_x_x_x_cid:2CA3D081-873F-48D8-A33D-3B03E139830E"><OR_max_current.png></span><br>
<div><br>
<blockquote type="cite">
<div>On Feb 6, 2022, at 4:19 PM, David Armstrong <<a href="mailto:armd@jlab.org" target="_blank" rel="noreferrer">armd@jlab.org</a>> wrote:</div>
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Hi Folks,<br>
This will be a very interesting study!<br>
cheers,<br>
David<br>
<br>
On 2/6/22 3:12 PM, Liyanage, Nilanga K (nl8n) wrote:<br>
</div>
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Dear All</div>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
My objectives for the high current study are to learn about challenges in high occupancy running such as pileups in both time and space, two signals on the same strip separated by a short time) and two hits on nearby strips causing the clusters to merge.
Even if we solve all hardware problems like gain drop, we are sure to be limited by the occupancy issues in GEp. </div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
Like Kondo said the highest beam current we can take will be limited by the 1 mA limit on the GEM power supplies. The baseline GEM current is about 735 uA, and we are running around 780 uA now (with 5 uA of beam current on LH2) ; this is about 45 uA excess
current in GEM. Given this we should be able to go five times higher or more in beam current before we hit this limit. </div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
So I would like to try to go up to 25 uA on LH2 and also on LD2, if we can get those beam currents.</div>
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We can do this in a few steps, say 5 uA steps in beam current. All we need are short runs, say 10 min at each setting</div>
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I agree with Alex that it is best to take these without zero suppression. </div>
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As Kondo suggested, at each setting we can first take a run with only one UV chamber turned on. After that run, if things look OK, turn the rest of the GEMs and take another run, and then repeat this procedure at the rest of the beam currents.</div>
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<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
If we only take the high current runs with only one chamber on, and not take the tracking runs with the other chambers on, then there is nothing we can learn about pileup and this exercise would not be very useful.</div>
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<br>
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So we must take tracking data to as high beam current as we can</div>
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<br>
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Best</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
Nilanga</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
Arun: Given accelerator limits and Hall C running, how much maximum beam current can we take ?</div>
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<div id="m_1825829807653952783x_x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b><span> </span>Sbs_gems<span> </span><a href="mailto:sbs_gems-bounces@jlab.org" target="_blank" rel="noreferrer"><sbs_gems-bounces@jlab.org></a><span> </span>on
behalf of Holly Szumila-Vance<span> </span><a href="mailto:hszumila@jlab.org" target="_blank" rel="noreferrer"><hszumila@jlab.org></a><br>
<b>Sent:</b><span> </span>Sunday, February 6, 2022 10:45 AM<br>
<b>To:</b><span> </span>Rathnayake, Anuruddha (adr4zs)<span> </span><a href="mailto:adr4zs@virginia.edu" target="_blank" rel="noreferrer"><adr4zs@virginia.edu></a><br>
<b>Cc:</b><span> </span><a href="mailto:Sbs_gems@jlab.org" target="_blank" rel="noreferrer">Sbs_gems@jlab.org</a><span> </span><a href="mailto:Sbs_gems@jlab.org" target="_blank" rel="noreferrer"><Sbs_gems@jlab.org></a>;
Arun Tadepalli<span> </span><a href="mailto:arunts@jlab.org" target="_blank" rel="noreferrer"><arunts@jlab.org></a><br>
<b>Subject:</b><span> </span>Re: [Sbs_gems] [EXTERNAL] Upper limits in terms of beam current for the GEM study planned for tomorrow</font>
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<div dir="ltr">To be clear, the question is what current limits are we willing to test up to for the gem test tomorrow on swing- probably a question for Nilanga and/or Kondo. I think this is for coordination with MCC purposes. </div>
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<blockquote type="cite">On Feb 6, 2022, at 9:52 AM, Anuruddha Rathnayake<span> </span><a href="mailto:adr4zs@virginia.edu" target="_blank" rel="noreferrer"><adr4zs@virginia.edu></a><span> </span>wrote:<br>
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<div dir="ltr">Dear All,<br>
<br>
There is a discussion going on between our current RC (Arun) and some of us here in Jlab about what would be the beam current limits that we should adhere to, if it is possible to come into such a limit looking at the observations we have made so far. <br>
<br>
I'm attaching the GEM linearity studies we have done so far, if that helps to make a decision. <a href="https://logbooks.jlab.org/entry/3932489" target="_blank" rel="noreferrer">https://logbooks.jlab.org/entry/3932489</a><br>
<br>
I believe if you use linearity studies done at SBS-11, that would be the best as our current spectrometer angles at SBS-9 are similar to what we had at SBS-9 (Please correct me if I am wrong, I know this more of as a word of mouth rather than referring to any
official documentation).<br>
<br>
Best,<br>
Anu<br>
<br>
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