[PEPPo] Daily RC Report 6/3

[voutier at lpsc.in2p3.fr]

https://positron.jlab.org/wiki/index.php/Sun%2C_June_3%2C_2012_%28Voutier%29

Daily RC Report

Polarimeter calibration continues...

Data Taking

The data points at 4.2 MeV/c and 6.3 MeV/c have been measured. The  
status of the actual analyzing power data as compared to simulation is  
summarized in the PEPPo log entry

http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1789768

The data support the presence of a charge asymmetry at PEPPo current  
even if zeroed at higher currents with the PITA procedure.

http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1789669

This latter was measured in the morning using a small scintillator  
detector and found to be in accordance with the response of polarimeter.

http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1789699

Combining magnet polarities and half-wave plate data will remove this  
dependence.

The origin of the non-linearities previously mentionned have been  
traced-back to the saturation of the FADC range from the pile-up of  
signals.

Hardware

We still have issues with the beam spot stability at T2. The dipole  
power supply is slowly drifting and should be corrected regularly  
manually till monday, when experts will investigate the problem.


Next 24 hours:

Saturday, 6/2 - SWING SL=Robert MICHAELS

   Calibration of the polarimeter at 3.2 MeV/c
   Energy change to 7.2 MeV/c

Sunday, 6/3 - OWL SL=Jean-Sebastien REAL

   Calibration of the polarimeter at 7.2 MeV/c
   Systematic studies

Sunday, 6/3 - DAY, SL=Joe GRAMES

   Dipole power supply work
   Spin dance


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