Linear collider muon detector: What

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Linear collider muon detector Whats new
in Europe

• Marcello Piccolo
• Arlington, Jan. 2003

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Agenda

• ADVANCES (?)
• Mainly simulation
• tried version 3.0.6 for Brahms (thanks Ties)
• Debugging stage almost over
• Capability of writing hits files for
  calorimetry and muon system
• will try to integrate the two devices
• RD
• Beam time allocated at Frascati (Three weeks )

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The new Brahms release

• The (Fortran) Code to full simulate the Tesla
  detector has been upgraded
• W-Si calorimeter option has been implemented
• Had Cal is based on the scintillator design.
• As of now it is possible to write a complete hit
  file containing
• Tracking detectors
• Calorimeters
• Muon detector

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The new Brahms release (cont.)

• I tried to integrate a relevant number of events
  in order to check performances and reproduce
  previous results.
• My plans were to run 10000 bb events and 10000
  ZH events, but I was able to simulate about 4000
  bb events and 1000 ZH events.
• The complete package takes a couple of
  minutes/event on a P4/1.7GHz for the entire
  thing a factor 4 less if one starts from a hit
  file and does only reconstruction.

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Single positive muon efficiency

• Comparison between the old simulation (open dots)
  and the new 3.0.6 one (full dots).
• Some hints of non-optimized matching can be seen.

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Energy leakage

• Here too there seem to be discrepancies between
  the two releases
• The newer version seems to have smaller leakage
  into the muon filter.
• This statement has to be taken cum grano salis,
  as I did not have a chance of looking at results
  in detail.
• Next meeting Ill probably be able to say more on
  this issue.

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Lets now go to bb events

• Here is the overall momentum
• spectrum of the produced
• hadrons.
• It is worth noticing the relatively
• low momenta of the produced
• particles.
• The average momentum is a bit
• less than 10 GeV/c

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Here are the overall resultsbb events _at_500 GeV
The four spectra refer to Black generated
primary particles Red generated
m Green identified m Blue misidentified p
4000 evts
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Here are the overall resultsZH events _at_500 GeV
The four spectra refer to Black generated
primary particles Red generated
m Green identified m Blue misidentified p
1000 evts
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Some RD points

• There are few issues that need to be addressed
• RPC (either bakelite or glass) have to be
  certified as rate capable.
• Gas mixes that grant to be neutron transparent,
  especially for the end-caps have to be found.
• Working regimes have to be investigated in
  different rates environment.

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The Frascati Test Beam Facility
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Conceptual view of the facility
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Particle multiplicity
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In the coming months

• Look deeper and (hopefully) understand the
  details of the new simulation tools.
• Merge had-cal hits and muon hits to reduce the
  muon detection threshold.
• Start developing a swimming routine to follow
  penetrating tracks through the different detector
  subsystems.
• Start the RD program on parallel plate chambers
  at TBF in Frascati.