Summary:

Glen White:  Using the Pair Luminosity Monitor (BeamCal) to Extract Beam parameters

• Glen took over Achim Stahl's program to extract beam parameters from the BeamCal observables.  Achim's April 2004 results are posted here for reference.
• Glen has converted the FORTRAN to MATLAB, added Beam-Beam kick as a new observable, added 3 Banana-ness parameters to those we would like to extract and has begun the process of computing Taylor matrix parameters relating parameters to observables, a process that requires many Guinea-Pig runs.
• Plan is to investigate quality of results as a function of
  • Crossing Angle
  • "Real-ness" of input beam distributions
  • Field Map
  • Detector granularity, resolution, etc.

Andrei Seryi:  Study of 2mrad Horizontal Crossing Angle

• Andrei looked at photon and e beam distributions at entrance of QF magnet for the proposed CLIC-inspired 2mrad crossing angle scheme using TURTLE to transport the rays and making approximations where necessary to mimic disrupted beam distributions.
• SR Photons from beam core and disrupted beam distribution agreed with Appelby's LCWS'04 talk, exiting between the poles of the QF1 magnet
  • Leave aside for the moment just how field-free the coil pocket can be made while providing the needed gradient
• SR from the halo hit both the beampipe at the downstream end of QD and the magnet poles of QF

Andrei Seryi:  First look at local chromatic correction lattice that could be tested at the ATF

• A first attempt was made and compared to the lattice proposed by our KEK colleagues.  Results look promising.

Takashi Maruyamai:  GEANT study of SR from disrupted 500 GeV beam at QF1 Face

• SR and beam rays similar to Andrei's
• Plots for 500 GeV beams  indicate lots 150kW of power in SR photons using proposed scheme at 1 mrad, rising sharply with increasing crossing angle. Design to handle this would be required
• It was agreed that future studies would also look at 250 GeV beams

Tom Markiewicz, 09/24/04