What might we try to do in the first engineering run to learn 
about the M13 muon beam?

We want to learn about the behavior of the muon beam as a
function of almost anything that we can control or can change
with time. Much of this can be done with simulation, but having
reliable data with which to test and verify the simulation
results would be a great advantage. The information will help to
experimentally verify or extend our understanding of systematic
uncertainties.

Some of this can be done without relying on the solenoid tracking
chambers, and should be done as soon as possible, in the fall
engineering run.

Two temporary separated chambers, each with x-y information,
followed by scintillators for muon and electron identification
and triggering, give us position (x and y) and divergence (dx and
dy) of a particular particle trajectory. The distributions and
correlations of x, y, dx, and dy can be measured, at least for
higher energy pions (as well as electrons and cloud muons).

This kind of measurement will give us information on the beam
properties as a function of:

1. Beam emittance (jaw settings)
2. Momentum acceptance (slit settings)
3. Beam element settings (dipole and quadrupole settings)
4. Beam tune strategy (maximum rate tune, or whatever Jaap
   Doornbos suggests as a useful tune)

Other measurements must be done with surface muons. Here the
scattering in one chamber could make interpretation of results
difficult or impossible. For these cases, another strategy could
be used, perhaps involving a movable collimator in vacuum
followed at some distance by one x-y chamber.

In this case, we measure the beam as a function of:

5. BL1A steering (protect monitor readings)
6. Solenoid field (on or off)
7. Production target (10 mm graphite or ss-jacketed Be, or...?)
8. Muon tof (surface or cloud muons... could also be learned from
   run above 30 MeV/c).

There are other kinds of measurements which will be considered,
including muSR to determine cloud muon polarization, which do not 
rely on a fast x-y chamber.


-- 
 Glen Marshall                mailto:Glen.Marshall@triumf.ca
 TRIUMF, 4004 Wesbrook Mall   phone: 604-222-7466
 VANCOUVER, BC V6T 2A3        fax:   604-222-1074

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