<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>As far as I can tell, there has been a lot of work in the hall. trucks are in and out, there is a new detector on the beamline...ect.<br></div><div><br></div><div><br></div><div data-marker="__SIG_PRE__">Marc McMullen<br>Physics Division<br>Detector Support Group<br>7738</div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Amrit Yegneswaran" <yeg@jlab.org><br><b>To: </b>"dsg-rich" <dsg-rich@jlab.org>, "Valery Kubarovsky" <vpk@jlab.org><br><b>Sent: </b>Monday, August 6, 2018 7:01:10 PM<br><b>Subject: </b>Re: [Dsg-rich] RICH cooling system instability<br></div><div><br></div><div data-marker="__QUOTED_TEXT__"><div style="font-family: tahoma,new york,times,serif; font-size: 14pt; color: #009900"><div>so marc/george do you guys know why the door is kept open through the workday.<br></div><div>is it because stuff is coming in and going out or <em>is it for the smokers on the edge</em>!<br></div><div>i thought doug tilles retired.<span id="transmark" style="display: none; width: 0px; height: 0px;"></span><br></div><br><br><hr id="zwchr"><div><b>From: </b>"Marc Mcmullen" <mcmullen@jlab.org><br><b>To: </b>"Valery Kubarovsky" <vpk@jlab.org><br><b>Cc: </b>"dsg-rich" <dsg-rich@jlab.org>, "Marco Mirazita" <marco.mirazita@lnf.infn.it><br><b>Sent: </b>Monday, August 6, 2018 4:45:19 PM<br><b>Subject: </b>Re: [Dsg-rich] RICH cooling system instability<br></div><br><div><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>We have looked at the signals and are seeing a correlation between the signal dips and activity in the hall. The low point of the dip in signal is right around mid-day, but it starts between 7 and 8 am.The signal is back to the previous level between 3 and 5 pm. This essentially looks like the bulk of the Hall B Mechanical/Engineering staff work day, primarily when the roll-up door is used/open.<strong>This does not happen on the weekend</strong>. We looked into other flow signals (LTCC) on the forward carriage and the same thing happens. The dominant culprits look like hall temperature and pressure. This looks like it may be related to the roll-up door, which is generally open during work days.</div><br><br><br><br><div><img src="cid:d3c78e488d3ec0afb6d1a64d80a8a4b2f4f7887d@zimbra" width="877" height="516"></div><div>This is a long plot (7/15 to 8/6). Here you can see the some of the RICH temperatures reacting to daily temperature spikes (bright green). On the 25th the compressors are switch on (dk green) and (teal), during the dips in airflow1 and 2 hall pressure (red) has a sharp drop.</div><div><br><br><br></div><div><img src="cid:432ca189ca6b89e7208a5de77f4d33b77880d4f6@zimbra" width="773" height="450"></div><br><div>Here i have zoomed in (7/31 to 8/3), and the dip spike correlation is more evident.</div><br><div><img src="cid:c8ce53b950dfbfb5307d9ae79e8f33a764308219@zimbra" width="883" height="402"></div><div>Here is a finer X scale view. <br></div><br><br><br><br><div>Marc McMullen<br>Physics Division<br>Detector Support Group<br>7738</div><br><hr id="zwchr"><div><b>From: </b>"Valery Kubarovsky" <vpk@jlab.org><br><b>To: </b>"Peter Bonneau" <bonneau@jlab.org><br><b>Cc: </b>"dsg-rich" <dsg-rich@jlab.org>, "Marco Mirazita" <marco.mirazita@lnf.infn.it><br><b>Sent: </b>Monday, August 6, 2018 3:18:04 PM<br><b>Subject: </b>Re: [Dsg-rich] RICH cooling system instability</div><br><div><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000;"><div>Thank you Peter!</div><br><div>I switched the detector ON to monitor the RICH parameters.</div><br><div>Regards,</div><div>Valery</div><br><hr id="zwchr"><div><blockquote style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Peter Bonneau" <bonneau@jlab.org><br><b>To: </b>"Valery Kubarovsky" <vpk@jlab.org>, "Tyler Lemon" <tlemon@jlab.org><br><b>Cc: </b>"dsg-rich" <dsg-rich@jlab.org>, "Marco Mirazita" <marco.mirazita@lnf.infn.it><br><b>Sent: </b>Monday, August 6, 2018 3:00:42 PM<br><b>Subject: </b>Re: [Dsg-rich] RICH cooling system instability</blockquote></div><div><blockquote style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><p>Hi Valery,</p><p>DSG is looking into this issue.</p><p>I've checked the Hardware Interlock system and it's running normally.</p><p>Mark and George are investigating the compressor for the drop in flow and pressure that occurs around 12:00.</p><p>Peter</p><p><br></p><br><div class="moz-cite-prefix">On 8/6/2018 10:32 AM, Valery Kubarovsky wrote:</div><blockquote cite="mid:1675800492.14823491.1533565977196.JavaMail.zimbra@jlab.org"><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000;"><div>Hi Tylor,</div><div>I observe some instability in the RICH cooling system. Please take a look to the log entry</div><br><div><a class="moz-txt-link-freetext" href="https://logbooks.jlab.org/entry/3584390" target="_blank">https://logbooks.jlab.org/entry/3584390</a><br></div><br><div>It is happening around 12:00. The temperature increase is obviously connected with the change in the<br> airflow1 and airflow2, as well as with the change in the airpr1. As a result we got interlock signal from sensor temp4 and temp11.</div><br><div>Could you please take a more careful look.</div><div>Thank you,</div><div>Valery</div></div><br><fieldset class="mimeAttachmentHeader"></fieldset><br><pre>_______________________________________________
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