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 transcript:

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 ●...

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

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 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

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

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

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) PMTs !

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  = photons

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

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

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

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

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

Carsten Schwarz PANDA June 2004 Micro Channel Plate PM Planacon , Burle light: LED

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

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

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