A TWIST physics analysis meeting was held on December 7 and 8.  The goal
was to get on track with strategies for the April run, and to initiate
work in preparation for the January collaboration meeting.

Priorities for the April run were discussed.  Formost of these are
	- Determination of internal stack alignments
		- D vs. t studies vs. temp, pressure
	- Determination of energy calibrations
	- Determination of WC efficiencies for Michel positrons
		- as a function of wire, energy, and angle
	- test of the accuracy of the t_o determinations
	- a study of muon range and target stopping distributions
	- the above to be done with He/Iso

Other items include:
	- repeat of the above with DME
	- study of alignment of WC to field (perhaps in two positions)
	- study of magnet to beam (not necessary in near term)
	- study of proton beam shifts
	- beam backgrounds (we'll study this parasitically)
	- trigger efficiency
	- multiple scattering
	- pile-up
	- cloud muon beam
	- M13 tune
	- map edge of momentum distribution
	- cosmic ray trigger

The software tracking speed was discussed.  If
	- tracking takes 333 ms per event on a 1 GHz machine
	- and if we have 10 cpu's running at 1 GHz
	- and if we use all 10 cpu's for 12 months
we can expect to track approximately 10^9 events in a year.  We should
plan our 2001 data runs to optimize planning for 10^8 events in the
first year.

We spent some time discussing alignments strategies.  These have been
posted before at
http://stoney.phys.ualberta.ca/~e614//Projects/E614-S3/00008/

One additional idea was to use higher momentum muons.  These could be
stopped in the downstream scintillator, the target, and the upstream
scintillator due to range straggling.  The decays from the three z
positions would illuminate the detector with increased uniformity.

The alignments group will prepare estimates of the statistical sample
necessary, but needs the tracking code before progress can be made.

There was some discussion of the possible grid adjacent to the target. 
If the target is not flat, this grid would smooth the field.  It was
felt that we don't have a clear enough idea how the scattering would
increase if such a grid was employed.

Some studies planned include:
	
TWIST-Geant
	Energy calibration distributions (Farhana, Andrei)
		- normal beam
		- cloud muon beam

	Hard Scatters from grid (Co-op student)

	Alignment
		- stats (don)
		- distribution (Dave)
	Range Studies (Maxim)
		- Sc thickness
		- Compare Geant with PSI data
		- optimal target thickness (mylar?)

	Beam studies - Can we reconstruct a beam focus with the stack?
		(co-op student)

	D vs. t studies (start with idealized contours)

M13 - Geant
	Production of a cloud muon beam with the degrader wheel between
		dipoles (Peter?)

Semi-analytic
	studies of systematics (Roman, Nate, Jim)
		- such as, how does one compare rho with and without polarized beam?

The above topics will be discussed further at the January collaboration
meeting.

			nate
			
-- 

Nathan Rodning, Associate Chair
Professor of Physics
University of Alberta
Edmonton, Alberta   T6G 2J1
Canada
(780) 492-3518  /  Fax:  (780) 492-0714
http://www.thehungersite.com/

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