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Status of the LHCb RICH detector and the HPD

Beauty 2005. Status of the LHCb RICH detector and the HPD. Tito Bellunato – Università degli Studi di Milano Bicocca & INFN On behalf of the LHCb RICH group. Assisi – 23 June 2005. The LHCb detector. Designed to study CP violation and rare decays of B-hadrons at LHC. RICH2: 17-100 GeV/c.

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Status of the LHCb RICH detector and the HPD

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  1. Beauty 2005 Status of the LHCb RICH detector and the HPD Tito Bellunato – Università degli Studi di Milano Bicocca & INFN On behalf of the LHCb RICH group Assisi – 23 June 2005 Tito Bellunato

  2. The LHCb detector Designed to study CP violation and rare decays of B-hadrons at LHC RICH2: 17-100 GeV/c RICH1: 2-60 GeV/c Tito Bellunato

  3. Aerogel RICH 1 aerogel RICH1 C4F10 CF4 RICH2 Tito Bellunato

  4. RICH 1 Mechanical Design - Overview 20 G Magnetic shields ~8 tonnes of “Armco” iron RICH 1 shields Detection plane 0 G Quartz windows Seal directly to the Vertex Locator exit window Gas enclosure Tito Bellunato

  5. RICH 1 Optics 7 x 14 Hybrid Photon Detectors Flat glass mirrors Spherical beryllium mirrors Aerogel Beryllium beam-pipe C4F10 gas radiator Tito Bellunato

  6. RICH 1 Mirrors 3mm thick Be base + 0.3mm glass surface layer coated with Al. Radius curvature: 2700mm Beryllium blank Beampipe hole Tito Bellunato

  7. Aerogel I Ct (- ) 4 l T = Ae linked network of SiO2 particles density = 0.15 g/cm³ hygroscopic Transparent over a wide range: optical properties dominated by Rayleigh scattering: Transmittance T, clarity factor C, surface scattering factor A, thickness t, wavelength l A=95% C=0.0053 μm4/cm Produced by the Boreskov Institute for Catalysis in Novosibirsk Tito Bellunato

  8. Aerogel II n = 1.030 ± 0.001 C=0.006 μm /cm tested against: radiation OK C4F10 OK? Pre-production OK – 4 liters inside specs 4 World-record 50 mm thickness and 200 mm transverse size Tito Bellunato

  9. HPDs Beam AerogelMirror Testbeam I Mirror curvature R= 949 mm Beam: PS-T9 10 GeV/c p- (p+, p) Aerogel: 4 tiles 10x10x4.4 cm3 n=1.028 C=0.0052 mm4/cm Tito Bellunato

  10. Testbeam II Photon yield studies: Single photon resolution (mrad): Nγ HPD0 HPD1 HPD2 σθ HPD0 HPD1 HPD2 Data 1.19 1.00 0.86 Data 3.2 3.2 3.5 MC 1.22 1.09 1.21 MC 2.4 2.4 2.4 Scaling with acceptance to 2π : Becomes 2.7 mrad scaled to RICH1 optics Data 11.7 9.3 9.1 Tito Bellunato

  11. Testbeam III 10 GeV/c π+, p qpion= 238.0 mrad qproton= 221.4 mrad HPD plane Tito Bellunato

  12. RICH2 – software version CF4 gas volume : ~100 m³ Refractive index: n = 1.0005 HPD plane: 9 columns, 16 tubes each Tito Bellunato

  13. RICH 2 – hardware version Superstructure Magnetic shield maximum measured field at the HPD focal plane 6 G Awaited in the pit by the end of August Tito Bellunato

  14. Tito Bellunato

  15. Alignment I Clean room CCD Target Lens Laser Single Mirror Shutter Mirrors R = 8600 mm Tito Bellunato

  16. 2 mm Spherical Mirrors Alignment All mirrors from one side Alignment and stability set a 50 μrad contribution to the overall uncertainty in the single photon Cherenkov angle reconstruction Tito Bellunato

  17. The Hybrid Photon Detector Requirements: 2.6 m² coverage with 75% active area 2.5 x 2.5 mm² granularity Single photon efficiency 40 MHz readout S20 photocathode: 75 mm Ø active 20 kV operation Developed by CERN/ DEP(NL) cross-focused , 83mm Ø, encapsulated binary electronics 32 x 32 pixels (500 mm x 500 mm). Tito Bellunato

  18. The HPD - II On-detector Off-detector RICH2 column Tito Bellunato

  19. System Test I HPD column mechanics Beam Mirror HPD housing PS beam: 10 Gev/c π- e- Radiator vessel Tito Bellunato

  20. System Test II 3500 N2 run, one HPD accumulated rings 0 C4F10 run, ring on four HPDs. single event accumulated rings Tito Bellunato

  21. B┴ 50 G B║ 30 G 0 G B║ Magnetic distortions… B┴  Tito Bellunato

  22. …and corrections Calibration and distortion monitoring system in both RICHes to allow corrections Non uniform rotation (S-distortion) Third order polynomial fit Non uniform radial dilatation Second order polynomial fit Image rotation vs radius of entrance point Radius on chip vs radius of entrance point B║ 1, 3 and 5mT Rotation angle (rad) Radius on chip (mm) Entrance plane radius (mm) Entrance plane radius (mm) Parameterisation under control for both axial and transverse field distortions Tito Bellunato

  23. The RICH project is healthy and advanced Construction is under way - almost over for RICH2 The photon detector is understood in both detection issues and data-flow Eager for first collisions in 2007 Conclusions Tito Bellunato

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