Present: Peter Bosted, Don Crabb, Keith Griffioen, Piotr
         Decowski, Bill Olson, Steve Rock

Target: Draft of Design Document sent to John, he is working on it. 
May 15 will be Target review. 

Beam: Lew has checked that a dump at 8 deg., directly after last end
magnet, makes negligible muon background. He will write a memo on this. 
He is presently looking at muon backgrounds from collimators (like
C37 and one in alcove). Peter studied E158 test runs with various
quad settings: can reproduce optics. Implications for E160 are that
beam in x will be about 5 mm wide (sigma) at diamond, and 1 mm wide
at collimator. In vertical, results depends on linac emittance: with
damped beam get very small spots, but need to check if beam is
small enough with undamped beam (3 mm-murad would give too big a spot
size at diamond). 

Spectrometer: Keith still checking if should use (1+cos**2) for
J decay or not.  

Simulations: Study of B81 filled with alumina. Design of beam pipe
being worked on by Piotr. File with atomic catered gammas from
beam, which hit sides of pipe and make background. Got rate down from 
1000 to 10 charged particles/spill/plane (for huge planes), by
improved beam pipe design.  Smaller planes
will much less. Another problem is nuclear interactions in
target. Get about 100 hits/spill in (small) front plane from gammas
(low energy, exponential, peaked around 100 MeV). Rates are much
lower without beam pipe, so this has significant impact. So,
presently hadronic punch-through gammas are a bigger problem than
Compton scattered ones. Keith still looking into Nuclear Compton.
Peter suggests that we should look at Primakof effect (nuclear
coherent pi0 photoproduction: large cross section from lead)?
Note: simulations now are for "high luminosity" setting at 48 GeV, 
corresponding to 5E10 elec. on 0.015 r.l. diamond and 1 mm radius
collimator (3 times higher psi rate than proposal). 
Greg Mitchell will start to work on simulation of E161 spectrometer.

Detectors: Steve had an idea to taper thickness to compensate for 
attenuation.

Range telescope: Keith will look for references about resolution. 

Equipment: Keith talked to Dave Cashy who went to Fermilab. Talked
to Volker. Dead ends so far. Greg Mitchell will contact Focus group.