<div dir="ltr"><p>Summary experiment meeting</p><p>Present : Bob, Thia, Steve, Doug, Dave Meekins, Kijun, Marco, Mongi, Longwou, Alexandre</p><p><br></p><p>Dave Meekins :</p><p>2 standard cell loop cooled down, no leak</p><p>Silviu cell loop still leaks : leak might be in loop not in cell</p><p>Need to place the tune cylinder target</p><p>Would like to know when we would cool down : lock up is on Feb 27th, so about a week later at the soonest<br></p><p dir="ltr"><br>
On Feb 9, 2015 12:56 PM, "Alexandre Camsonne" <<a href="mailto:camsonne@jlab.org" target="_blank">camsonne@jlab.org</a>> wrote:<br>
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> Let's meet today so we can see where we stand. We will meet in Hall C counting house. Second floor is almost done we should check when we can invade the place.<br>
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> In previous mail :<br>
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> I had those topics<br>
><br>
> -beamline<br>
> --ARC measurement (Doug ?)<br>
Harp new controller installed and working ( Thanks Javier ! ) need new software from accelerator to analyze<br>
Mapper working<br>
Need checked HV of ARC HARPs<br>
</p>
<p dir="ltr">> --Compton<br>
> ---cavity ( Dave ?)<br>
New mirror, same type. Coupling still low 25 %<br>
Might try higher reflectivity later<br>
> ---photon ( Bob ?)<br>
Led pulser back and working<br>
See amplitude in CMU DAQ</p><p dir="ltr">Auxiliary signals plugged in : helicity, cavity power , laser polarization, bcm</p><p dir="ltr">Should be able to get an asymmetry<br>
> ---electron detector ( Alex )<br>
IOC back online after Sue set it back. Can control low voltage, high voltage and threshold</p><p>Ported software to new computer. Can take data and decode</p><p>Detector in beamline for checks, many hot strips but since Compton edge is pretty far at high energy, current detector should be OK even with missing strip so would tend to stick with old detector. Testing electronics without detector, hot strips still there so most likely electronics /noise problem.<br> </p>
<p dir="ltr">> --raster ( Luke / Bob ? )<br>
Raster non uniformity, observed in sampled current. High frequency ripple going in driver might causes spikes. So the spikes in current are real, this might induce a bit of more of boiling ( to be quantified but most likely small ), not an issue for DVCS, at first glance should be OK for GMp<br>
> --BCM / Unser ( Thir ?)<br>
Legacy working fine<br>
New receiver died in middle of run : suspect is locking frequency of the box is fixed. New pathlength adjustement scheme involves tuning accelerator frequency which could get out the bandwidth range of the BCM receiver. <br>
Fiber optic to carry the frequency will eventually be installed to fix that ( unlikely to be done for this run ). So need to pay attention to matching of BCM and accelerator frequency to have a BCM backup to legacy.<br></p>
<p dir="ltr">><br>
><br>
> -HRS ( Longwu, Yang, Barak or Kalyan ? )<br>
><br>
Left HRS checked out, scaler double pulsing fixed
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<p dir="ltr">Right HRS : detector checked out, some issues with VDC ( ? plots in HALOG ! )<br></p>
<p dir="ltr">> -DVCS<br>
> --electronics ( Marco / Alex )</p><p dir="ltr">Test stand operation. Ben to check out the bad spare ARS board.</p><p>Rest of electronics should be fine<br></p><p dir="ltr">
> --calorimeter ( Carlos / Mongi ? )</p><p dir="ltr">Nothing on DVCS calorimeter for now<br>
> --F1 ( Marco / Steve / Alex ?)</p><p>Steve has several spare. Will check the bad boards and setup F1 in test crate to test spares. <br></p>
<p>GMp related from Cynthia :<br></p><p dir="ltr">SOS will be powered this week</p>
<p dir="ltr">><br>
><br>
> Luke confirmed he will be around. I can update on Compton Edet, DVCS electronics.<br>
> Feel free to come by and update.<br>
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> If you thing of any items we need to have worked out you can add to<br>
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> you can also update the status of a system there so we can keep track.<br>
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