Simulation Issues
A partial list of G0 issues that are on the list for simulation study follows.
(Note that the order does not imply a priority.) If anyone is considering doing
other studies, or if there are other questions that you think should be
studied send e-mail to Steve Williamson.
- How effective is the 2-layer detector and coincidence requirement
at eliminating background counts. Would adding thin material (aluminium?)
between the two layers improve background rejection by eliminating
"cross-talk"? How much material would be needed to make this worth while?
- Look again at the collimator thicknesses using up-to-date geometry.
For forward-angle mode, what is the rate of proton "punch through"?
- In the forward- and backward angle modes, what are the rates of and
what is the time structure of energy deposited in the scintillators as
a function of intial reaction product (electrons, protons, pions, gammas,
etc) produced in a target reaction.
- What is the PI-/e ratio for backward-angle mode.
- In the up-stream position, how effective is the planned exit line/helium
bag at lowering the background radiation? Are there dimensions that
could be altered to optimize this? Is there any way to re-focus the
beam magnetically (quads) to dump the beam more cleanly?
- How effective is the current plan for neutron shielding around the
exit line. Would more shielding near the detectors significantly reduce
the neutron generated background from this source?
- What is the effect of the block house/floor on our rates (target
related rates -- repeat rates calculation with external shielding -- and
background rates -- non-target-related).
- Estimate low energy background (neutrons and photons) in the detector
and exit window regions. Estimate total dose rate to detectors, bases, and
windows. Also include moller running mode and non-G0 production running
(the object is to estimate radiation damage to components that will
live continuously in the hall).
- Investigate the effects of proposed vacuum windows in the beam line
for vacuum isolation of the spectrometer.
- What techniques could be used for the verification (calibration)
of the spectrometer optics using beam.
- Provide test data for the analysis codes.