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FYI!</div>
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Crew chief said the maintenance is done and beam will come soon.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Sanghwa Park <sanghwa@jlab.org><br>
<b>Sent:</b> Friday, August 21, 2020 12:59 PM<br>
<b>To:</b> HyeKyoung Park <hkpark@jlab.org><br>
<b>Cc:</b> Mike Spata <spata@jlab.org>; Paschke, Kent Dieter (kdp2c) <paschke@virginia.edu>; Ciprian Gal <ciprian@jlab.org><br>
<b>Subject:</b> Re: Hall A data from FFB and FF test</font>
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<div>Again, I won't be able to post this to bteam@jlab mailing list. Please forward it to the list.</div>
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<div>Here are the data for 1C12 BPM. We don't have anything before the arc in our data stream. We have 1C11, 1C12, 1C16, 1H01, 1H04A, 1H04E. </div>
<div>There is a halog with more plots (<a href="https://logbooks.jlab.org/entry/3831916">https://logbooks.jlab.org/entry/3831916</a>) but somehow the ordering is mixed up. I put some summary here.</div>
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<div>rms:</div>
<div>FF on FFB on: 90.14 (um)<br>
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<div>FF, FFB paused: 19.18 (um)</div>
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<div>FF off, FFB on: 13.57</div>
<div>FF off, FFB paused: 11.9</div>
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<div>Note: </div>
<div>When FFB is paused, FF is also paused as far as I understand. During our data taking, the FFB paused period is when the beam modulation was running.</div>
<div>We don't see this additional noise with FF on in the X position.</div>
<div>Just for the complete information, we cannot run with FF off but FFB on, the beam energy modulation (dithering) doesn't work in this setting.<br>
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<div dir="ltr" class="x_gmail_attr">On Fri, Aug 21, 2020 at 10:59 AM HyeKyoung Park <<a href="mailto:hkpark@jlab.org">hkpark@jlab.org</a>> wrote:<br>
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Replying to include people copied in the original message.<br>
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<div id="x_gmail-m_8341050860054148191divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Mike Spata <<a href="mailto:spata@jlab.org" target="_blank">spata@jlab.org</a>><br>
<b>Sent:</b> Friday, August 21, 2020 10:02 AM<br>
<b>To:</b> HyeKyoung Park <<a href="mailto:hkpark@jlab.org" target="_blank">hkpark@jlab.org</a>>;
<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a> <<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a>><br>
<b>Subject:</b> Re: Hall A data from FFB and FF test</font>
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It would be very helpful to have this data for 1C12 BPM and 2 vertical and 2 horizontal BPMs before the Arc. Can we see that?</div>
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Mike</div>
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<p style="margin-top:0px; margin-bottom:0px"><span id="x_gmail-m_8341050860054148191x_ms-rterangepaste-start"></span><span style="font-family:arial,helvetica,sans-serif; font-size:11pt">--</span><span style="font-family:arial,helvetica,sans-serif; font-size:11pt"> </span><br style="font-family:arial,helvetica,sans-serif; font-size:16px">
<span style="font-size:11pt"></span><span style="font-family:arial,helvetica,sans-serif; font-size:11pt">Michael Spata</span><br style="font-family:arial,helvetica,sans-serif; font-size:16px">
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<div id="x_gmail-m_8341050860054148191x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> BTeam <<a href="mailto:bteam-bounces@jlab.org" target="_blank">bteam-bounces@jlab.org</a>> on behalf of HyeKyoung
Park <<a href="mailto:hkpark@jlab.org" target="_blank">hkpark@jlab.org</a>><br>
<b>Sent:</b> Friday, August 21, 2020 9:42 AM<br>
<b>To:</b> <a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a> <<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a>><br>
<b>Subject:</b> [BTeam] Fw: Hall A data from FFB and FF test</font>
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<div id="x_gmail-m_8341050860054148191x_x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Sanghwa Park <<a href="mailto:sanghwa@jlab.org" target="_blank">sanghwa@jlab.org</a>><br>
<b>Sent:</b> Friday, August 21, 2020 9:32 AM<br>
<b>To:</b> <a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a> <<a href="mailto:bteam@jlab.org" target="_blank">bteam@jlab.org</a>><br>
<b>Cc:</b> HyeKyoung Park <<a href="mailto:hkpark@jlab.org" target="_blank">hkpark@jlab.org</a>>; Paschke, Kent Dieter (kdp2c) <<a href="mailto:paschke@virginia.edu" target="_blank">paschke@virginia.edu</a>>; Ciprian Gal <<a href="mailto:ciprian@jlab.org" target="_blank">ciprian@jlab.org</a>><br>
<b>Subject:</b> Hall A data from FFB and FF test</font>
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<div>Hello all,</div>
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<div>Thank you for the discussion this morning. Here is some information when we did the test with FFB system. </div>
<div>Please let me know if you need anything from us. We are happy to provide any information that would help.<br>
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<div>I put the timestamps of our runs which would be useful for you to look at the archive.</div>
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<div>We took two runs, </div>
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<div>run 7699:</div>
<div>Run start time: 2020-08-13 17:00:06 </div>
<div>Run end time: 2020-08-13 17:44:58</div>
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<div>"During" the run, we test (1) FF ON, FFB ON (2) FF ON, FFB pause. The plots below show the comparisons of BPM1Y. Note the vertical scale on the right plot.<br>
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<div>On the right plot, x-axis is the entry number of our data, so it's time proxy. Each entry is for one helicity window at 120Hz.</div>
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<div>Observation: With FF on, we see vertical jitter in our BPMs. The plots only show BPM1Y here but other BPMs saw it too.</div>
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<div>run 7700:</div>
<div>Run start time: 2020-08-13 17:46:26</div>
<div>Run end time: 2020-08-13 18:02:36</div>
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<div>During this run, we test (1) FF OFF, FFB ON (2) FF OFF, FFB pause. BPM1Y comparisons plots are attached below. </div>
<div>Observation: whether we have FFB on or not, if FF is off we didn't see the large jitter anymore.</div>
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<div><img alt="image.png" width="541" height="542" data-outlook-trace="F:1|T:1" src="cid:17411e862bfcb971f162"></div>
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<div>Also, we observed that Hall A Compton central rate (backscattered photon, not background rate) behaves better with FFB and FF OFF. See <a href="https://logbooks.jlab.org/entry/3826851" target="_blank">https://logbooks.jlab.org/entry/3826851</a></div>
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<div>The strip chat shows the compton central rate and FFB status. </div>
<div>Top graph is the Compton central rate. The bottom one is FFB status, =FFB ON, 0=FFB off. </div>
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<div>Sanghwa (Hall A RC)</div>
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<div dir="ltr"><span style="font-size:12.8px">Sanghwa Park</span>
<div style="font-size:12.8px">Stony Brook University</div>
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<div dir="ltr"><span style="font-size:12.8px">Sanghwa Park</span>
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