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RICH 2004 Playa del Carmen, Mexico Nov. 30 – Dec. 5, 2004

Short report from RICH 2004 at Playa del Carmen. RICH 2004 Playa del Carmen, Mexico Nov. 30 – Dec. 5, 2004. Itzhak Tserruya. There are three experiments that have constructed or are constructing RICH counters with CsI photocathodes: COMPASS

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RICH 2004 Playa del Carmen, Mexico Nov. 30 – Dec. 5, 2004

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  1. Short report from RICH 2004 at Playa del Carmen RICH 2004Playa del Carmen, MexicoNov. 30 – Dec. 5, 2004 Itzhak Tserruya RICH 2004, Playa del Carmen

  2. There are three experiments that have constructed or are constructing RICH counters with CsI photocathodes: • COMPASS • RICH detector for kaon Physics in Hall A at Jefferson Lab • ALICE (STAR) RICH 2004, Playa del Carmen

  3. COMPASS SPECTROMETER Beam:160 GeV µ+ 2 . 108 µ/spill (4.8 s/16.2s) Pm ~ 80% trigger-hodoscopes DW45 straws SM2 dipole Muon-filter2,MW2 HCAL1 RICH_1 Gem_11 ECAL2,HCAL2 SM1 dipole MWPC Gems Scifi Polarised Target Muon-filter1,MW1 Veto straws,MWPC,Gems,SciFi Gems,SciFi,DCs,straws Silicon SciFi Micromegas,DC,SciFi BMS RICH 2004, Playa del Carmen Silvia DALLA TORRE

  4. 3 m 6 m vessel mirror wall photon detectors: CsI MWPC 5 m radiator: C4F10 COMPASS RICH-1 - DESIGN from the experiment design: • hadron PID up to ~50 GeV/c • LARGE acceptance (large size): H: 500 mrad V: 400 mrad • able to stand trigger rates up to 100 KHz • beam rate up to 108 Hz • minimize material + detector designed in 1996 radiator: C4F10 detection of VUV photons (165-200 nm)

  5. PHOTON DETECTION photon detectors (PD) : 5.3 m2 MWPCs (8 chambers) with CsI photocathode read-out: 84,000 analog read-out ch.s with extended local intelligence MWPCs with CsI photocathodes 2 CsI photocathodes, 60 x 60 cm2 each RICH 2004, Playa del Carmen Silvia DALLA TORRE

  6. MWPCs WITH LARGE SIZE PHOTOCATHODES, COMPASS EXPERIENCE photocathode storing marble tablewith x,y movement and microscope to solde anode wire and for dimensional checks(gaps, planarity within 100 mm) CsI: hygroscopic, water degrades QE never exposed to air (max 50 ppm O2 , routinely: 10 ppm) glove box to handle photocathodes photocathode transportation system RICH 2004, Playa del Carmen Silvia DALLA TORRE

  7. JLABHall ARICH COLLABORATION E.Cisbani, S.Colilli, F.Cusanno,S.Frullani, R.Fratoni, F.Garibaldi, F.Giuliani, M.Gricia, M.Iodice, M.Lucentini, L.Pierangeli, F.Santavenere, G.M.Urciuoli, P.Veneroni, G. De Cataldo, R. De Leo, L.Lagamba, E.Nappi, J.LeRose, B.Kross, B.Reitz, J.Segal, C.Zone, H.Breuer INFN – JLAB – Univ. Of Maryland Performance and results of the RICH detector for kaon physics in Hall A at Jefferson Lab 5th International Workshop on RICH Counters (RICH2004) Playa del Carmen, Mexico November 30 – Dececember 5, 2004

  8. JLAB Hall A RICH layout – similar to ALICE HMPID RICH Freon Radiator: 1800x400x15 mm3 single box with quartz windows glued on neoceram housing Grid plane: 100 mm positive wires (collects electrons ionized in the gap) Wire chamber : composed by 20 mm anode wires plane sandwitched between a cathode plane formed by 100 mm wires and the cathode plane formed by the photocathodes Three Photocathodes : 403x640 mm2each, divided in 8.4 x 8 mm2 size pads evaporated with a 300 nmCsI layer Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

  9. Photocathode positioning in the glove box Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

  10. JLAB Hall A RICH: the evaporation system Quantum Efficiency 110 cm Measurement System details in : F.Cusanno et al. NIM A502(2003)251 Photocathode 120 cm crucibles 10-6 mbar vacuum 2 nm/s CsI deposition at T = 60ºC (CERN experts indications). Vacuum - heating conditions starts15 – 24 h before evaporation. A post-evaporation heat treatment is done for 12 hours. Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

  11. Covers ~5% of central barrel phase space • Extends identification of • /K to 3 GeV/c and K/p to 5 GeV/c ALICE HMPID RICH 2004, Playa del Carmen

  12. 10mm C6F14 radiator 5 mm 80 mm CH4 4 mm CsI photo- cathode MWPC ALICE HMPID (see talk of A. Gallas) • Proximity focusing RICH counters consisting of seven modules. • 15 mm thick liquid C6F14 radiator (n= 1.2988 at  = 175 nm) • 12 m2 of CsI photocathode deposited onto the pad cathode of a MWPC. ( talk of H. Hoedlmoser) proximity gap RICH 2004, Playa del Carmen

  13. The CsI evaporation station at CERN

  14. ALICE HMPID prototype in STAR See talk of Nikolai Smirnov Prototype successfully tested and used in STAR

  15. Summary • No one has used a dry room for CsI handling. If we want to use we will have to prove that it does not affect the QE. • There is a lot of experience and know how around  A. Braem from CERN RICH 2004, Playa del Carmen

  16. PLAYA Del CARMEN Event Display …there are rings too! Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

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