Linear collider muon detector: Marcello Piccolo Amsterdam, April 2003

Marcello Piccolo2 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. R&D Dedicated real work started or starting on a very short time base.

Marcello Piccolo3 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

Marcello Piccolo4 The new Brahms release (cont.)

Marcello Piccolo5 Muon ID with dE/dx Correction

Marcello Piccolo6 Here are the overall results: ZH GeV The four spectra refer to: Black: generated primary particles particles Red : generated  Green: identified  Blue : misidentified  7000 evt’s 7000 evt’s

Marcello Piccolo7 Some R&D 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.

Marcello Piccolo8 Conceptual view of the facility

Marcello Piccolo9 Simulated beam energy spectra

Marcello Piccolo10 Particle multiplicity

Marcello Piccolo11 Efficiency bidimensional map A good bakelite RPC The overall efficiency For this module is  = (92.7±.05 ) % Cosmic ray data

Marcello Piccolo12 Efficiency bidimensional map Glass RPC’s

Marcello Piccolo13 Plateaux for two 1.1 m 2 Glass RPC’s Turn on for streamer pulses on Glass RPC. Detector dimensions 1x1.1 m 2 Gas mix 60/35/5 Ar/Fr/Isob

Marcello Piccolo14 Transverse and longitudinal efficiency distributions Glass RPC 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

Marcello Piccolo15 R & D is Needed – Why? 1. How good is muon ID? For full LC menu? 2. Does E-flow benefit from  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  detector design?

Marcello Piccolo16 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.

Marcello Piccolo17 Extruded Scintillator R&D at Fermilab   Studied Wavelength shifting (WLS) fiber readout of scintillator extrusions for possible future large scale detectors u u Scintillator: MINOS extrusions s s 1 X 4 cm – grooved s s TiO 2 reflector u u Scintillator: KEK prototype s s 1.2 X 2.5 cm – hole down the middle s s TiO 2 reflector u u WLS: Kuraray Y11 s s 1.2 mm 175 ppm (MINOS Standard) s s 1.0 mm 200 ppm s s 0.5 mm 200 ppm u u Photodetector - Visible Light Photon Counter (VLPC) s s Used D0 HISTE VI devices – –QE=80-85% – –Gain  60,000 Alan Bross – March 2003

Marcello Piccolo18 VLPC Tests with MINOS Scintillator MINOS Ref. Value (sum)   1.2 mm WLS fiber (MINOS) results using VLPCs. Alan Bross March2003 Tests of 1.0 & 0.5 mm fibers, etc. Want to try co-extr of scint + fiber.

Marcello Piccolo19 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.  R&D 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.