Summary of process used to change the HV for 2009 in BTOW:HV Files: Version indicates interation/mapping (numeral/letter)
1) 2009_i0.csv HV/Mapping as set in 2008. Calibration determined from 2008 data electrons/MIPS.
http://drupal.star.bnl.gov/STAR/subsys/bemc/calibrations/run-8-btow-calibration-2008/05-absolute-calibration-electrons
2) 2009_i0d.csv Map of SoftId/CellId determined by taking 6 data sets with all voltages set to 300 V, except for SoftId%6=0,1,2,3,4,5,6, successively. (link to Joe's pages)
http://drupal.star.bnl.gov/STAR/subsys/bemc/calibrations/run-8-btow-calibration-2008/08-btow-hv-mapping
drupal.star.bnl.gov/STAR/blog-entry/seelej/2009/mar/10/run9-btow-hv-mapping-analysis-summary
drupal.star.bnl.gov/STAR/blog-entry/seelej/2009/mar/05/run9-btow-hv-mapping-analysis
drupal.star.bnl.gov/STAR/blog-entry/seelej/2009/mar/08/run9-btow-hv-mapping-analysis-part-2
3) 2009_i1d.csv HV change determined from 2008 data electrons/MIPS (g1/g2)=(V2/V1)**k, with k=10.6 (determined from LED data).
http://drupal.star.bnl.gov/STAR/subsys/bemc/calibrations/run-8-btow-calibration-2008/06-calculating-2009-hv-electron-calibrations
4) 2009_i2d.csv Slopes measured for all channels. Outliers defined as |slope/<slope> -1|>0.2 (deviation of channel slope from average slope over barrel >20%:Approx 114 channels. Outliers corrected according to (s1/s2)=(V1/V2)**k as above. Hot towers HV reduced by hand. (Approx 10 towers)
http://drupal.star.bnl.gov/STAR/subsys/bemc/calibrations/run-9-btow-calibration-page/02-comparing-2007-2008-and-2009-btow-slopes