[Sane-analysis] Minutes of Feb 24th Meeting

[Narbe Kalantarians]

_*Narbe:*_ Ran SANE GEANT3 for 4.7GeV parallel data with higher 
statistics. Added tracker and hodoscope variables to  reconstruction. 
Compared reconstructed/thrown. Working, along with Oscar, on getting 
scripts to work for batch job submittal. Working on adjusting package to 
read in target material information (Z, A, densities, ...) for various 
packing fractions to be able to obtain dilution factors.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/SANE_GEANT


_*James:*_ Produced tables for calculated target polarization and 
calibration constant for each run. Working on retrieving corrupted 
data/event files ,which were mostly around the beginning
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/User:Jmaxwell#Important_Links


_*Hovhannes:*_ Per request, made plots showing improvement from 
implementing timing(time-walk correction) and geometric cuts to Cerenkov 
TDC spectrum. Plots shown are for mirrors 1, 3, and 8 (top to bottom, 
respectively), columns 1 and 2 (left and right panels, respectively). 
The black curves are before and red curves after implementation of these 
cuts. Mirror 3 loses stats, which might be from losing back-scattered 
events.   
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Cerenkov_TDC_Improvement
Next meeting will be Feb 17 2010 at 3:30pm


_*Luwani:*_ Finished beam position plots for remainder of runs. The 
quantities are Tx and Ty, which are, respectively, the horizontal and 
vertical beam positions projected back to the target.The  scale is 
millimeters. Will do similar plots for the target encoder positions to 
narrow in on why some runs show target edges on the Slow Raster (ADC) 
distributions.  
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Beam_Position_Studies


Hovhannes also mentioned that he noticed that the helicity information 
seems not well known, specifically the polarity for the helicity scalers 
that are written into the data. He mentioned that when he flips the sign 
on what these nominally are the asymmetries improve but the dead-times 
get wider in resolution and vice-versa.

Mark mentioned that it is not known what polarity the helicity scalers 
were set in the beginning of the experiment.

His asymmetries seem to be consistent, overall, with what Jon has been 
getting.


/*Please add or correct if I missed something or got something wrong./


The next meeting will be March 3rd at 3:30 pm
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/sane-analysis/attachments/20100224/36901c8e/attachment.html