Notes from Local Meeting on Mar. 19, 2004

• Q² scanner - UMass group (Reported by Kent from briefing by Ross)
  

• Installed the Scanner System and checked motion control from PC in Counting House.
• Components will fit in allocated space with only minor modifications to PMT housing (to be done at UMass).
• System mounted on rail which is not designed to be fixed in place. Modifications to this mounting rail to hold it in place will be required. Alignment/positioning with precision from external fiducials will be difficult; beam-based position check will be required.
• Installation procedure takes significant time. In order to meet the goal of only one shift to install, a wiring junction box will be redesigned to use socket/plug (quick) connectors. Bob will coordinate with JLab technical staff to connectorize the cables; the connector types and wiring diagram will be passed to Ross so he can modify the junction box to match. With this change and with the cables already in place, it should be possible to complete installation of a scanner in one shift.
• It is desired, for efficiency of installation, that the scanner be setup in the Right HRS first. This is where the motion control hardware is located, so this would allow more testing and preparation for the installation in the second arm, for which time is more critical.
• Mover system and frames have gone back to UMass for modification to increase stability and more robust cable handling.

• Bob

• Working on Lumi.

• Lisa

• Showed plots of birefringence gradients of Arwen. Similar in size to what was measured previously.
• New Pockels cells are due to arrive soon.
• Next things to do in laser room: measure the steering, study IA cell, work on imaging, characterize new cells.
• For various reasons, work in laser room has fallen behind schedule, but it seems most problems impeding progress have now been resolved.
• Source configuration plan is another high priority.

• Ryan

  • Working on charge asymmetries from GDH run
  • Doing calculations concerning things of interest with the source
    

• Hachemi

• Finished building one of the Target Lumi.
• Still analyzing Lumi Data.
• Working on Compton with David.

• Bryan

• Fixing ADCs.

• Riad

• Working on Lumi.

• General Issues

• Thinking about rewriting PANAM for a simpler and more stable interface
  • Bob, Bryan, Hachemi, and Kent will discuss this.
  • Getting Rich involved would be difficult, as he doesn't have a DAQ handy for testing.
• Sieve running is clearly necessary for HAPPEX. Pointing measurement requires small holes to define kinematics and, most importantly, there is no extended target optics data since the GDH run.