Minutes of the E00-102 Meeting
Tuesday, July 17 2002

Fissum

MA/KF/WH/BR/AS/LW

o Mattias announced he has decided to relocate from
  JLab to Lund in order to more efficiently pursue 
  his Lic degree.  This means coursework and a period
  of writing and as a result, the e00102 analysis will 
  progress more slowly.  Very tentative goal for the 
  conclusion of the Lic work is 021231 (the end of 
  this year).

o Wendy announced she has decided to relocate from
  JLab to ODU to more efficiently overlap with Larry.
  She will continue to pursue the e00102 analysis.

o we made tentative and loose plans for an E00102 
  collaboration meeting in very early January, 2003.
  Location t b a.

o Wendy showed plots demonstrating progress she had
  made from last week.  There is evidence of 
  discriminator time-walk as a function of pulse 
  height in the S0 TDCs.  The plan will be to 
  cut/paste the time-walk correction algorithm from 
  the other Si paddles into the S0 routines to remove 
  it, and then fold the S0 information into the S1/S2 
  optimization to (hopefully) gain on the ultimate 
  signal-to-noise ratio in the coincidence timing peak.

o Wendy also showed plots of her first attempts with
  Nilanga's y_target optimization routines.  As it 
  turned out, the present optics database produced 
  results that did not look too bad; however, there 
  were definite twists in certain of the y_target vs. 
  (x, y, theta, phi) plots for the HRSl.  We do not 
  have the experience to gauge how "bad" these twists 
  are.  Wendy will talk to Nilanga and/or Doug to try
  and determine a quality factor.  The HRSr was not 
  investigated yet - it is a little more complicated 
  with sieve slit data for protons, but we are hopeful 
  we can extract some useful information with very 
  restrictive "pristine" Emiss cuts to clean up the 
  spectra, as per Nilanga's original idea.  Ultimately, 
  it looks like we have some optics "issues".

o Once these optics issues have been taken care of, we
  want to track the spectrometer pointing throughout
  the experiment.  Bodo took us through many questions 
  we had regarding coordinate systems, surveys,
  spectrometer mispointings, LVDTs, pointing runs, and 
  so forth.

o in the end, we decided on an algorithm whereby for
  each H2Ofall run, we will look at y_target as 
  reconstructed by the HRSl for each of the foils.
  We will track this value as a function of run number
  and thus time.  Since the HRSl was completely static
  during the experiment, we anticipate no changes.
  Should this be true, we can assume a static target,
  and then use y_target from the HRSr to reconstruct
  its pointing.

o Mattias then went through the PERL scripts he has
  been writing which will allow us to pull any EPICS
  variables we want out of the datastream and stripline
  them - that is, plot them as a function of time both
  within a run and over several runs.  Bodo suggested
  we can then pipe this information through a little
  piece of code that checks for time stability and
  consistency in order to identify "non-ideal" runs.
  A very nice "pre-analysis" that we will pursue.

o Kevin then distributed the PRC article to "wow and
  amaze" everyone with the progress.  Right now we
  are waiting on Nilanga's archives and (hopefully)
  Juncai agreeing to remake some figures in the
  interest of efficiency.  Again, the goal is to
  have a distributable version in hand by mid-August,
  when Kevin returns to JLab prior to the GRC.

o finally, Kevin went through the figures he pulled 
  out of his archives for the generation of Mattias' 
  GRC poster, and we came up with a tentative design.  
  We'll (Kevin and Mattias) generate a poster in late 
  July and early August and send it around for comments. 
  Kevin will bring a "finalized" version to JLab in 
  mid-August before the GRC for people to see and offer 
  any last minute comments.