Linear collider muon detector:

1
Linear collider muon detector

• Marcello Piccolo
• Amsterdam, April 2003

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Agenda

1. Simulation
2. Started running with V 3.07 in Brahms. Few
   preliminary results
3. Results available also from the other side of the
   Atlantic.reasonable agreement.
4. RD Dedicated real work started or starting on a
   very short time base.

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The new Brahms release

• The (Fortran) Code to full simulate the Tesla
  detector has been upgraded (thanks to Ties and
  Vasily)
• W-Si calorimeter option has been implemented
• Had Cal is based on the scintillator design.
• The Design Report muon detector has also been
  folded in.
• 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.)
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Muon ID with dE/dx Correction
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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
7000 evts
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Some RD points on the EU side of the Atlantic

• 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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Conceptual view of the facility
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Simulated beam energy spectra
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Particle multiplicity
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Efficiency bidimensional mapA good bakelite RPC

• The overall efficiency
• For this module is
• (92.7.05 )
• Cosmic ray data

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Efficiency bidimensional mapGlass RPCs

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Plateaux for two 1.1 m2 Glass RPCs
Turn on for streamer pulses on Glass
RPC. Detector dimensions 1x1.1 m2 Gas mix 60/35/5
Ar/Fr/Isob
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Transverse and longitudinal efficiency
distributions Glass RPC
The tube structure of the Glass RPC is
apparent in the first plot where boundaries
between different Detectors can be seen as a
drop In the efficiency. The distribution along
the other coordinate is flat as expected
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R D is Needed Why?

1. How good is muon ID? For full LC menu?
2. Does E-flow benefit from m Cal?.
3. Requires integration with barrel and forward
   tracking and calorimetry, structural Fe,
   solenoid, mechanical support, cables, etc.
4. Robust design parameters - must be understood,
   optimized, cost estimated, reviewed.
5. Best m detector design?

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Mechanical Engineering

1. Statics OK with 47T plates
2. Bolting appears to be possible structurally.
3. Open questions
4. Machined Fe?
5. Groove fitted?
6. Spokes a la CMS?
7. Bolted?
8. Opportunities for further ME work here.

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Extruded Scintillator RD at Fermilab

• Studied Wavelength shifting (WLS) fiber readout
  of scintillator extrusions for possible future
  large scale detectors
• Scintillator MINOS extrusions
• 1 X 4 cm grooved
• TiO2 reflector
• Scintillator KEK prototype
• 1.2 X 2.5 cm hole down the middle
• TiO2 reflector
• WLS Kuraray Y11
• 1.2 mm 175 ppm (MINOS Standard)
• 1.0 mm 200 ppm
• 0.5 mm 200 ppm
• Photodetector - Visible Light Photon Counter
  (VLPC)
• Used D0 HISTE VI devices
• QE80-85
• Gain 60,000
  Alan Bross March 2003

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VLPC Tests with MINOS Scintillator

• 1.2 mm WLS fiber (MINOS) results using VLPCs.

Tests of 1.0 0.5 mm fibers, etc. Want to try
co-extr of scint fiber.
MINOS Ref. Value (sum)
Alan Bross March2003
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Outlook and Conclusions

• Simulation tools specific to the muon filter are
  being developed both in Europe and U.S.
• Preliminary results seems to be in comfortable
  agreement.
• RD programs (again specific) to muon detector
  have started and will be in full swing in the
  coming months.
• Interesting developments also relevant for the
  hadronic calorimeter will be pursued.