Minutes of the E00-102 Planning Meeting
Monday 010709
KF

Present:

MA Mattias Andersson
CC Chris Curtis
JD Jim Dahlberg
KF Kevin Fissum
WH Wendy Hinton
DM Dave Meekins
BR Bodo Reitz
AS Arun Saha
LW Larry Weinstein

o DM volunteered to take the reigns of the waterfall 
  target issues, and interact with both the Italians 
  and the survey group to ensure that we have a 
  working target on Day 0, and that we know its 
  location.  AS pointed out that a target review needs 
  to be done in the very near future.  DM agreed to 
  interact with Franco Garibaldi on this subject as 
  well.

o AS went through the drawings of the new waterfall
  target and outlined to CC and JD what we were 
  after.  LW then went through what he feels the 
  critical dimensions and tolerances are.  In 
  particular, he pointed out we have no tolerance for 
  beam left yaw, but substantial tolerance for beam 
  right yaw.  Pitch and roll are not an issue.  CC 
  and JD outlined just how the anticipated setup would 
  be surveyed (errors in this description are mine):

  - fix permanent mount points for the survey targets
    to the outside of the rectangular can.  JD pointed
    out this is critical, and wondered if it was too
    late to do it.  The concensus was it was not.  DM
    made suggestions as to where to locate these mount
    points.  The targets act as fiducials for the posts 
    which guide the water.  Shoot the position of the 
    fiducial targets w r t the posts.

  - put the stainless steel windows on the rectangular
    can, and put the rectangular can inside the
    scattering chamber.  Locate mount points for 
    survey targets on the outside of the scattering
    chamber.  Survey the position of the fiducials on
    the rectangular can w r t the survey targets on the 
    outside of the scattering chamber.

  - close up the scattering chamber.  Shoot the location
    of the survey targets on the outside of the 
    scattering chamber, the survey targets on the 
    superHARPs/BPMs, and the spectrometers w r t the 
    hall/accelerator coordinate system.
   
o DM pointed out there is vacuum inside the scattering
  chamber, and that the pumpdown of the cryotarget system
  causes non-predictable motion in all three dimensions
  of a few mm (which they then compensate for).  JD
  suggested it would then be a good idea to test for
  this with a precheck - set up to look for variations
  in the position of the fiducials on the rectangular
  can through optical ports on the scattering chamber
  during pumpdown.

o KF asked which scattering chamber we would be using,
  and does it have the optical ports CC and JD need.
  Right now I am confused because I heard both that
  Paul Brindza had a new scattering chamber for us, 
  and that we would use the e89003 scattering chamber.  
  If we use the e89003 scattering chamber, since it is 
  not critically circular, we probably have to think a 
  bit more about how we will set and determine the angles 
  and pointing of the spectrometers.  That is, we may 
  need to do pointing measurements with each angle 
  change (no big deal because we have foil targets).

o AS suggested we go to a new rectangular can and 
  scattering chamber design.  He suggested extending
  the upstream and downstream beamlines to butt up 
  against the rectangular can, replacing the 75 um
  stainless steel windows on the side of the rectangular
  can with something much thinner and see-through (which
  would ease all the survey troubles tremendously), and 
  removing the windows on the scattering chamber and 
  leaving the chamber filled with room air.  AS will 
  investigate, but we will assume for now that we will
  use a system essentially identical to the one we 
  used for e89003.

o JD pointed out the solid target ladder hanging beneath
  the rectangular can will also need fiducializing, 
  and pointed out that a reproducibility check would 
  also be a good idea.  AS stated that the tolerances 
  for this are much more relaxed.

o we decided that we would like other surveys which were
  approved by CC and JD:

  - the as-found angular location of the HRSl both at the 
    beginning and the end of the experiment.

  - the as-found angular location of the HRSr at the 
    beginning of the experiment (when it is along qvec), 
    and then at the end of the experiment (after we have 
    moved it back to where we think qvec is).
 
o CC made note of our timetable and asked for a summary
  of our desired tolerances for the knowledge of the
  location of the targets.  DM and LW will work on 
  this independently, and then compare results.  What
  they agree on will be forwarded to CC.

o AS suggested another meeting in mid-August.