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Carsten Schwarz PANDA June 2004 CID Cherenkov Imaging Detectors ● RICH software at HERMES, Ralf Kaiser, Glasgow ● Present status of DIRC, C.S., GSI ● Spiralling.

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Presentation on theme: "Carsten Schwarz PANDA June 2004 CID Cherenkov Imaging Detectors ● RICH software at HERMES, Ralf Kaiser, Glasgow ● Present status of DIRC, C.S., GSI ● Spiralling."— Presentation transcript:

1 Carsten Schwarz PANDA June 2004 CID Cherenkov Imaging Detectors ● RICH software at HERMES, Ralf Kaiser, Glasgow ● Present status of DIRC, C.S., GSI ● Spiralling electrons, Klaus Föhl, Edinburgh ●...

2 Carsten Schwarz PANDA June 2004 Present status of DIRC ● GSI Design proposal ● Working principle (BaBar) ● TOP (Belle) ● Photondetectors ● TR

3 Carsten Schwarz PANDA June 2004 GSI Design Proposal (CID) PANDA: Spokesperson: Jim Ritman, Deputy: Guenther Rosner PANDA1 (CID): Leading Part.: GSI, Task Coordinator: C.S. 2.280 TEuro 430 TEuro RICH: Glasgow Guenther Rosner 163 TE Edinburgh Klaus Foehl 20 TE DIRC: Darmstadt C.S. 173 TE Mainz Josef Pochodzalla 49 TE Vienna Johann Marton 25 TE

4 Carsten Schwarz PANDA June 2004 Ring Imaging Cherenkov Detectors RICH RICH focus or proximity focusing DIRC Detecting Internally Reflected Cherenkov light PID: tracking  p, RICH  b  m pin point focus (camera obscura) CID Cherenkov Imaging Detectors

5 Carsten Schwarz PANDA June 2004 Charged particle identification with DIRC How to perform PID within a magnetic field in front of an EMC as compact as possible (material, costs) DIRC For p~GeV: SiO 2 (n=1.47) Aerogel, C 6 F 14 (n=1.02, 1.24) target B

6 Carsten Schwarz PANDA June 2004 DIRC less space than aerogels costs of calorimeter no problems with field Detecting Internally Reflected Č-light (exsting at BaBar) 10000 PMTs !

7 Carsten Schwarz PANDA June 2004 DIRC K eff.  miss-id. reaction pp   at  s = 3.6 GeV/c 2 degree K eff.  miss-id. reaction pp   at  s = 3.6 GeV/c 2 degree  2 /n=2.4 pion  =0.9745 47 photons

8 Carsten Schwarz PANDA June 2004 Mechanical radiator quality Edge losses Edge thickn. Sharpness of edges should be  50  m Needs special care for handling

9 Carsten Schwarz PANDA June 2004  T, T2 T1 (discussed at Belle)  reduced # of PMT for Kaon PID  very good time resolution required (~ 100 ps) DIRC-TOP Time Of Propagation

10 Carsten Schwarz PANDA June 2004 Mechanical support quartz slabs embedded in honeycomb structure

11 Carsten Schwarz PANDA June 2004 Photon detector test ALADIN magnet MCP-PM Burle Planacon 85001-501

12 Carsten Schwarz PANDA June 2004 Micro Channel Plate PM Planacon 85001-501, Burle Photocathode pixelized photoanode MCP glass tube

13 Carsten Schwarz PANDA June 2004 Micro Channel Plate PM Planacon 85001-501, Burle light: LED

14 Carsten Schwarz PANDA June 2004 Photon detector candidate: PMT-MCP Photocathode pixelized photoanode MCP glass tube works up to 2.2 Tesla amplification up to 10 7 fast: 0.1 ns Anashin et al. NIMA 504 (2003) 276 pores: 9  m

15 Carsten Schwarz PANDA June 2004 DIRC Topics for Technical Report ● Geometry of slabs – 17 x 30 – 10 x 30 – 5 x 30 mm 2 – 10 x 120 – 10 x 240 mm 2 ● Cherenkov angle resolution  C – tracking (photon det.) – dispersion (#ph  ) – transport BABAR TOP

16 Carsten Schwarz PANDA June 2004 RICH topics for Technical Report ● Thickness of radiator(s) – #ph vs. Rayleigh scattering ● Refractive index ● Cherenkov angle resolution  C


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