[PEPPo] RC summary 2012-06-24 Swing
Arne Freyberger
freyberg at jlab.org
Sun Jun 24 20:21:21 EDT 2012
Peppo production running ended at noon today and a series of systematic
studies have been taking place since noon. The BPM pedestal data and
final PITA scans were completed first off. This was followed by an
access to install the "E" counter, a large (but perhaps not large
enough) plastic scintillator to measure the energy of the positron
beam. It was discovered that the E counter pulse height increased with
lower beam energy, and then by beam steering. The present thought
is that the positron energy is 100% captured by the scintillator,
perhaps due to the average beam location not quite at the center of the
detector.
Never the less, the Fiber Array studies will take place on Owl shift
and if a larger crystal/scintillator can be found during Monday Day
shift the energy measurements will resume. Below is the status of the
"Systematic Studies" plan as of 20:19 this evening.
>
> 1 2012-06-24 Sun Day/Swing systematic studies
>
>
> What Duration Who Run # Elog Why
>
> (h)
>
>
>
> BPM Pedestal Current 120nA 0.25 Riad 6691 1793845
> <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793845> Do these
> runs Saturday Swing
> BPM Pedestal Current 200nA 0.25
> 6675 1793769 <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793769>
> BPM Pedestal Current 330nA 0.25
> 6674 1793765 <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793765>
> 400na
>
> 6672 1793755 <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793755>
> BPM Pedestal Current 450nA 0.25
> 6690 1793842 <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793842>
> BPM Pedestal Current 690nA 0.25
> 6673 1793765 <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793765>
> PITA scan
>
> 6692,6693,6694
>
> PITA scan
>
> 6695,6696
>
>
> Total 1.5
>
>
> See this peppo entry for more details
> <http://opweb.acc.jlab.org/CSUEApps/elog/entry/1793735>
>
>
>
>
>
>
>
>
>
>
> Change spectrometer to 6.2MeV/c, 1mm W 0.17
> 6698 1793860
> <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793860> Measure TS1
> rate: measured 199.51 KHz
> Access to Inj (rewrite to reflect grames plan) 1 Grames
> 1793866 <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793866>
> Retract Polarimeter, install E1 counter
> Reconfigure Trigger 1 Erica
>
> TS1.E1 coincidence, real time, 30Hz, sample mode
> E profile at 6.2MeV/c, TS1 30mV 0.5
> 6715
> E1 EPICS name is: Inj_Scaler ?_Ch ?
> E profile at 6.2MeV/c, TS1 @ 10mV 0.17
> 6716
>
> E profile at 6.2MeV/c, E1 only trigger 0.17
> 6717,6718
>
> Change spectrometer to 5.2MeV/c 0.1
>
>
>
> E profile at 5.5MeV/c, TS1 30mV 0.17
>
>
>
> E profile at 5.5MeV/c, TS1 @ 10mV 0.17
> 6719
>
> E profile at 5.5MeV/c, E1 only trigger 0.17
> 6720,6721
>
> Change spectrometer to 4.2MeV/c 0.1
>
>
>
> E profile at 4.2MeV/c, TS1 30mV 0.17
> 6722
>
> E profile at 4.2MeV/c, TS1 @ 10mV 0.17
> 6723
>
> E profile at 4.2MeV/c, E1 only trigger 0.17
> 6724
>
> Change spectrometer to 3.2MeV/c 0.1
>
>
>
> E profile at 3.2MeV/c, TS1 30mV 0.17
> 6725
>
> E profile at 3.2MeV/c, TS1 @ 10mV 0.17
> 6726
>
> E profile at 3.2MeV/c, E1 only trigger 0.17
> 6727
>
> Change to 0.1mm target 0.01
>
>
>
> E profile at 3.2MeV/c, TS1 30mV 0.17
> 6728
>
> E profile at 3.2MeV/c, TS1 @ 10mV 0.17
> 6729
>
> E profile at 3.2MeV/c, E1 only trigger 0.17
> 6730, 6731
> scans complete by 17:16
>
> Total 5.36
>
>
> Change spectrometer to 6.2MeV/c, 1mm W 0.1
>
>
> Measure TS1 rate
> Configure *BFM* 31MHz 0.5
>
>
>
> E profile at 6.2MeV/c, TS1 30mV 0.17
> 6733 1793962
> <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793962> Pandemonium
> and confusion sets in trying to
> Change spectrometer to 5.2MeV/c 0.1
>
> 1793965 <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1793965>
> interpret the signals. Width of timing signal
> E profile at 5.2MeV/c, TS1 30mV 0.17
>
>
> of order 1.2-1.3 nsec. This is physically
> Change spectrometer to 4.2MeV/c 0.1
>
>
> about 15inches, quite a large fraction of the
> E profile at 4.2MeV/c, TS1 30mV 0.17
>
>
> beam transport.
> Change spectrometer to 3.2MeV/c 0.1
>
>
>
> E profile at 3.2MeV/c, TS1 30mV 0.17
>
>
>
> Change to 0.1mm target 0.01
>
>
>
> E profile at 3.2MeV/c, TS1 30mV 0.17
>
>
>
>
>
> 1.5
>
>
> Switch to electron mode, measure profile
>
>
>
> 6.2MeV/c e- saturated the E counter, switched to
> at two or three energies 2
>
>
> 3.2MeV/c for cross calibration purposes, although
>
>
>
>
>
> due to the difference in signal between e- and e+
>
>
>
>
>
> it is hard to say what we are calibrating.
>
> Total 2
>
> *We are Here at 20:30*
> Access to Inj 1 Joe
>
> Remove E counter, install NaI and W
> NaI coincidence Tests 3
>
>
> Deferred to Monday Swing?
>
> Total 4
>
> this is a like
> see: Fiber Array Plan
> <https://positron.jlab.org/wiki/images/c/c9/FinalHours_2012JUNE24_FiberArray.pdf>
>
>
>
>
>
>
>
>
>
>
>
> Access to Inj 2 Gueye
>
> install Fiber Array
> Change spectrometer to 6.2MeV/c, T=1mm 0.17
>
>
>
> Recommission Fiber Array 1
>
>
>
> Position Scans (? = 1cm, X & Y) 0.68
>
>
>
> e+ profile at 6.2 MeV/c 0.17
>
>
>
> Change spectrometer to 5.2MeV/c 0.17
>
>
>
> e+ profile at 5.2 MeV/c 0.17
>
>
>
> Change spectrometer to 4.2MeV/c 0.17
>
>
>
> e+ profile at 4.2 MeV/c 0.17
>
>
>
> Change spectrometer to 3.2MeV/c 0.17
>
>
>
> e+ profile at 3.2 MeV/c 0.17
>
>
>
> Change spectrometer to 3.2MeV/c w/ 0.1mm W 0.17
>
>
>
> e+ profile at 3.2 MeV/c 0.17
>
>
>
> Scan beam across T2, record 5minute runs 0.5
>
>
>
> Flip analyzing magnet polarity, study position/profile 0.5
>
>
>
> Vary S2 0.62
>
>
>
>
> Total 7.0
>
>
>
> Grand Total 20
>
> 4h more than 16.....
>
--
Arne Freyberger
Director Operations Department
Jefferson Lab Phone: (757) 269-6268
12000 Jefferson Avenue Pager: (757) 584-6268
Newport News, VA 23606 Email: freyberg at jlab.org
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