Minutes of the MUCOOL Meeting
          Friday, January 7th, 2000

 Scribe:  Steve Geer

 1.  RF Update        Al Moretti

     Lab G: Modulator has driven tube at full power. 
     Expect setup complete in a couple of months. Need to 
     check on plans for magnet delivery.

     Cavity: Al model progressing, complete in a couple of 
     months. 

 2.  X-Ray Measurements     Jim Norem

     Jim had some running time end of December, and measured 
     X-ray flux both on-axis and at 90 degrees, and found 
     comparable fluxes (within factor of 2 ?). Hence the flux
     seems to be roughly isotropic, and falls as E**9.5. Jim 
     plans more measurements soon.

 3.  Beam experiment design        Steve Geer

     Over the last few months we have been considering how to
     modify the beam experiment design so that an early (rather 
     than late) cooling stage can be measured ( -> larger beam 
     size/angles, lower required precision, and ~ 2 years later
     in time before the RF cavities will have been developed). 
     We have discussed ideas in Friday MUCOOL meetings, in the 
     2 Day MUCOOL collaboration meeting in November, and most 
     recently in a meeting at the LBNL Collaboration meeting 
     of those interested in doing the design work. 

     The present goal is to have a redesigned experiment ready 
     for presentation to MUTAC by early summer. Present ideas 
     for the experiment are:

     (i) Since the 200 MHz RF will be late, start with an initial
         experiment that has no RF, with the goal of learning how to
         make the required measurements. This experiment will require
         sufficient absorber to produce a significant change in emittance
         and the tested item could therefore (although not necessarily)
         be a minicooling section.

    (ii) Decouple the beam and instrumentation as much as possible from
         the setup to be tested. We would like to try designing the 
         instrumentation so that it out of the solenoid channel -> cheaper
         and more conventional spectrometers. Hence the "facility" would 
         provide a tagged and momentum and direction analyzed muon beam, 
         plus a way of measuring the muons at the exit of the cooling section
         being tested. The apparatus to be tested would include the "matching"
         from the FODO -> solenoid world.

      Note:  After the meeting Alvin suggested we think about using a 
      pencil-like (low emittance) beam at the input and make measurements
      by approaching the equilibrium emittance from below, rather than 
      above.  This idea deserves consideration ... it has some obvious 
      advantages.

 4.  Beam experiment design :  Status and Plans

     (a) Dan Kaplan:  Dan has provided preliminary beam input and output 
         files corresponding to the minicooling setup he is studying. The 
         next step is to provide files appropriate for the cooling experiment
         -> an input file for a beam that looks like a muon test beam 
         (5% momentum spread, small emittance) with a corresponding output
         file. Dan is also going to look into availability of large 
         aperture bending magnet at FNAL.

     (b) Gail Hansen:  Gail has begun to estimate (back of envelope) 
         detector performance required to make the measurements we need
         of the cooling system performance. Next step is to try to understand
         what set of measurements (i.e. plots) the experiment would need 
         to produce (e.g. pt(in) vs pt(out), r(in) vs r(out), etc) in order 
         to learn whether the channel is behaving as expected. 

     (c) Rick Fernow: Rick has been thinking about the acceptance needed 
         for the downstream measuring system. Once the muons exit the 
         solenoid channel they rapidly diverge -> large aperture magnet
         needed. Rick believes that we need to compute beam envelopes 
         through the system as a starting point to see if our concept of
         a decoupled measuring system (outside the solenoid channel) is 
         viable ... particularly the downstream end. If Dan can find out 
         what large aperture magnets might be available, then Rick together
         with Steve Kahn would be interested in trying to sketch a viable
         geometry (if one exists) for the downstream instrumentation. In
         the longer term, Rick would have a crack at designing the magnetic
         interface ("matching") between the solenoid channel and the
         upstream & downstream systems.

     (d) Steve Kahn: Steve has also been thinking about the instrumentation 
         channel, acceptances etc. The ultimate goal would be to produce 
         a complete GEANT simulation for the experiment. The starting point 
         is clearly a sketch of a viable geometry.

     (e) Don Summers: Don has begun to consider an explicit realization of 
         a detector system along the lines we are thinking. The first goal
         is to push this far enough to specify the position, angle, and 
         momentum resolutions that could be achieved. We will then be 
         able to use Dans input and output files, plus the list of plots 
         Gail plus the group identifies, to test whether Dons resolutions 
         meet our needs, or we need a more ambitious system.

     (f) Jim Norem:  Jims focus is to continue to work towards an 
         understanding of the X-Ray issue. Jim is also interested in the
         muon beamline design.

     (g) Kevin Lee:  Kevin expressed an interest in getting involved in 
         the experiment design studies.