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</style><article id="node-447902" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3375092" rel="bookmark">RC Status update (Wednesday)</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3375092" class="lognumber" data-lognumber="3375092">3375092</a>. Submitted by <a href="https://logbooks.jlab.org/user/brads">brads</a> on <time datetime="2016-02-03T21:53:32-0500" pubdate="pubdate">Wed, 02/03/2016 - 21:53</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr></table></div>
<div class="logentry node-content">
<p>A rough punchlist first, followed by the tentative plan for the next few days.</p>
<p>Exec summary:<br />
- we may lock up Thursday SWING to allow MCC to begin steering up the Hall A line (no target, no shift crew needed)<br />
- have CH staff starting Friday DAY shift, MCC will work to establish 2-pass beam to Hall A<br />
- straight through, no Compton Chicane<br />
- we'll run with 2-pass over the weekend<br />
- more details below</p>
<p>--------------------------------------------------------------------<br />
Hall Punchlist<br />
--------------------------------------------------------------------<br />
* Everyone needs to read and sign the COO/ESAD/RSAD in the Counting House<br />
- see also <a href="https://logbooks.jlab.org/entry/3375013">https://logbooks.jlab.org/entry/3375013</a></p>
<p>- Harp scanner checkout [Buddhini]<br />
- In progress: see <a href="https://logbooks.jlab.org/entry/3374823">https://logbooks.jlab.org/entry/3374823</a> and follow-ups<br />
- BPM issue follow-up from Fall [Buddhini, Thir, Pete Francis]<br />
- Sounds like the wrong numbers got into the CED in the Fall run and those<br />
bad coefficients drove the bad/strange numbers we saw. Pete affirms<br />
that those numbers were identified and corrected as part of the S&H<br />
troubleshooting of that problem.<br />
- I think Buddhini and Thir are also running some cross checks on those BPMs<br /><a href="https://logbooks.jlab.org/entry/3374826">https://logbooks.jlab.org/entry/3374826</a><br />
- Things sound OK, but Buddhini/Thir please make a halog summarizing the old<br />
issue from the emails we've received and confirm we're in good shape.<br />
- CODA EPICS logging still has a few missing/dead variables [Alex, et al]<br />
- A new Hall A BCM average current screen that uses the new BCM readouts has<br />
been requested [Brad, Kjeldsen, Alex]<br />
- Left Dipole NMR not locking [Segal]<br />
- Raster readback currents zero when on [Barak, Kalyan]<br />
- <a href="https://logbooks.jlab.org/entry/3374919">https://logbooks.jlab.org/entry/3374919</a><br />
- also waiting on some new hardware (filters?) to be installed<br />
- Confirm coin. timing in DVCS DAQ with EDTM [in progress]<br />
- HRS motion (bogie controls) hasn't been checked for a while [Segal]<br />
* NOTE! The RHRS is at 48 degrees and has been surveyed. Do *NOT* move.<br />
- The LHRS motion controls still need to be verified.<br />
- Arc energy scanner motion needs to be checked [Doug]<br />
- Position, Energy, Current locks (and FFB) status unclear [MCC, Brad]</p>
<p>*** Before 4pm Thursday ***<br />
- Be ready to lock up Hall at 4pm (if MCC is ready)<br />
- Ensure target is set to 'no target' position and controls locked out<br />
- Hall/RadCon Checklists completed [Jesse, RadCon; Brad]<br />
- The DVCS calorimeter needs to be pulled downstream on its rails<br />
- Note: It is already at its maximum angle (constrained by the RHRS).<br />
The RHRS angle is *not* to be changed for the time being.</p>
<p>--------------------------------------------------------------------<br />
Completed Punchlist Items<br />
--------------------------------------------------------------------<br />
- Hall A Halo Monitor reported to be not working/disabled<br />
- not critical path item, so will not follow-up at this time<br />
- Target GUI, controls reported to be working [Meekins]<br />
- Right Q1 power supply issue corrected [Segal]<br />
- I believe 700A is still the operational limit<br />
- Right Dipole power supply control working again [Segal]<br />
- LHRS Q1 limited to 1800A (~ 2.6GeV in standard tune)<br />
* We need to ensure shift crew have appropriate instructions on how to set<br />
the LHRS momentum correctly given this limitation.<br />
- Injector Faraday Cup problem from earlier run is confirmed to be fixed [Joe]<br />
- BCM readouts are reported to be working [Alex, Musson, Mack, Ciprian]<br />
- all systems ready for up to 100 uA<br />
- bad power supply causing strange signal noted Monday identified<br />
and replaced with a spare<br />
- linear FIFO removed from Dx3, Dx10 channels [Mack]<br /><a href="https://logbooks.jlab.org/entry/3374376">https://logbooks.jlab.org/entry/3374376</a><br />
- Helicity reporting set to 'prompt' [<a href="https://logbooks.jlab.org/entry/3374890%5D">https://logbooks.jlab.org/entry/3374890]</a><br />
- RHRS HVAC repaired [Chuck]<br />
- Target OTR reported to be working [Brad]<br />
- RHRS detectors in good shape [Kalyan et al]<br />
- LHRS detectors in good shape [Mongi et al]<br />
- DVCS detector in good shape [Mongi et al]</p>
<p>====================================================================<br />
Tentative plan for the near term -- detailed daily runplans to come<br />
====================================================================<br />
We will go with 2-pass beam to Hall A over this weekend and we'll<br />
scratch the Compton Chicane requirement (just go straight through).<br />
See below for more details. As usual, the farther in the future, the<br />
fuzzier the forecast...</p>
<p>Thursday SWING -- Friday OWL<br />
** Optional -- MCC must let us know if this will be useful to them **<br />
- Hall A will plan to lock-up the Hall by 4pm Thursday.<br />
- Target will be moved to the 'no target' position and motion<br />
disabled.<br />
- The DVCS calorimeter will be moved to its safest position<br />
(farthest from the beam line).<br />
* NOTE: there will need to be a low-current limit for this 'unattended'<br />
running so there is no chance of accidentally rad-damage the<br />
calorimeter during steer-up.<br />
- Tune beam will be fine, very low current CW (couple uAmps) is a<br />
maybe, but we need assurance that CW beam can't get "parked" on<br />
something thick in the target area and dump background into the<br />
Calorimeter for long periods.<br />
- Note that the in-Hall BLMs will not be calibrated and we can not<br />
easily monitor dose into the calorimeter. A<br />
* NOTE: We will _not_ have shift crew in the counting house until Friday<br />
DAY shift. MCC should be instructed to call the RC cell phone<br />
if necessary.</p>
<p>Friday DAY -- Weekend<br />
- We'll follow the whiteboard plan, but will take you up on taking<br />
2-pass beam over the weekend.<br />
- NO Compton chicane either<br />
- Do an All-Save, we'll be coming back to 2-pass later in the week.<br />
- Tasks will include:<br />
- Ion chamber calibration (we need to talk about this procedure) [MCC]<br />
- Establish energy, position and current locks (and FFB) [MCC]<br />
- Beamline commissioning work<br />
- ARC energy measurement<br />
- Target positioning study<br />
- Target raster scan<br />
- BPM calibration vs Harps<br />
- Rough BCM calibration (cross calibration Hall A BCMs vs Unser<br />
only, no FC2; non-invasive to other Halls)<br />
- Set LHRS DAQ to readout FADC in LHRS (low priority)<br />
- Start detector checkout and calibration studies<br />
- ...</p>
<p>Monday DAY<br />
- Hall A will go to Restricted Access for target cooldown<br />
* We would like to come back up at 1-pass after the target is cold<br />
- NO Compton chicane needed here either<br />
* If it is feasible to move the Tuesday beam studies to Monday DAY, that<br />
would be a bonus. (Our plan will be the same regardless.)</p>
<p>Monday SWING --> Wed DAY (?)<br />
* Run 1-pass CW beam<br />
- Run GMp optics calibrations studies<br />
- We'll finish any beamline commissioning tasks that were not<br />
completed over the weekend<br />
- ...</p>
<p>Wed DAY (?)<br />
* Pass change to 2-pass<br />
* go THROUGH the Compton Chicane this time<br />
- Yves and Compton experts (Gaskell) need to be on-shift during steer<br />
up to make sure the Compton is threaded well</p>
<p>Wed SWING --> Weekend<br />
- Run 2-pass production quality beam<br />
- Complete remaining DVCS calibration tasks and/or pending beamline<br />
commissioning tasks<br />
- Possible Moller commissioning and/or dedicated Compton Commissioning<br />
- Get the 2-pass DVCS production data in the can</p>
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