MUCOOL Meeting Notes, June 18 1999
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 I) Micro Channel Plate (MCP) TOF detector (Alan)
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   Alan thinks that an MCP timing station with a 30ps resolution is 
achievable for MuCool.  Resolutions of 50ps have been achieved in existing 
configurations.  A timing resolution of 10ps, which is also relevant to
the momentum determination using the TOF counter is harder to obtain.  The
main design issue for the MCP detector in MUCOOL is the strength of the 
magnetic field.  A magnetic field parallel to the axis of the MCP axis
reduces the number of electrons collected.  This effect is a function of
the strength of the field and the MCP pore diameter.  The available MCP
detectors have a pore diameter of 5microns, and they have been tested to have
acceptable gains operating in up to 2T fields.  Extrapolating from existing
data it seems that a 2microns MCP will work at 3T.  The bottom line is that the
TOF channel solenoid will be designed for 2T.  There are other possibilities
for future developments, like the microsphere plates and MCPs with 
sub-micron diameters, which will not be so strongly affected by the 
presence of the field.  

 The current status of the FNAL effort: have MCPs which are connected, have
initial mechanical design for setup, need detailing.

II) Geant Simulation of TOF channel.  Study momentum resolution (Panagiotis)  
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    The momentum resolution of the TOF detector was studied as a function of
the timing resolution and the slope resolution of the TPC upstream of the
TOF.  The objective was to examine at which timing resolution the TOF can
provide a competitive momentum measurement.  Both a Geant simulation and 
analytical calculations were used for this study.  The conclusions were:
a) for the x' range considered for MUCOOL, the momentum resolution of the
TOF is independent of the x' TPC measurement  b) p_z has to remain constant 
between the 2 TOF counters (then only one TPC measurement is necessary and the
reconstruction is simple), so the TOF counters have to be placed away from
the fringe field regions d) the momentum resolution obtained was 0.7% for
10ps, 1.2% for 20ps, and 2.2% for 50ps.

III) TPC reconstruction (S. Khan)
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    Steve reported on the resolution obtained with the current TPC 
reconstruction: Dp/p= 0.28%.  This is 2 times the quoted required resolution 
in the proposal.

IV) Cooling performance with smearing (Paul)
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    Paul smeared the DPGeant phase space distributions using the nominal
resolution parameters quoted in the proposal.  He concludes that cooling 
is apparent after the 5th section.  

V) Bunched beam design (Jim)
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   Jim presented his ideas on how to use collimators in order to define 
the beam phase space and clean the beam for the bunched beam version of the 
cooling experiment.



	p.spentzouris (spentz@fnal.gov)