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

Itzhak Tserruya RICH 2004, Playa del Carmen 2 There are three experiments that have constructed or are constructing RICH counters with CsI photocathodes: 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)

3 RICH 2004, Playa del Carmen Silvia DALLA TORRE 3 Itzhak TserruyaPlaya del Carmen, 30/11-5/12/ th RICH Workshop SM1 dipole SM2 dipole Polarised Target HCAL1 Muon-filter1,MW1 Micromegas,DC,SciFi Gems,SciFi,DCs,straws MWPC Gems Scifi trigger-hodoscopes Silicon COMPASS SPECTROMETER COMPASS SPECTROMETER RICH_1 BMS Gem_11 ECAL2,HCAL2 straws,MWPC,Gems,SciFi straws Muon-filter2,MW2 DW45 SciFi Veto Beam: 160 GeV µ µ/spill (4.8 s/16.2s) P  ~ 80%

4 4 COMPASS RICH-1 - DESIGN from the experiment design:  hadron PID up to ~50 GeV/c  LARGE acceptance (large size): H: 500 mrad H: 500 mrad V: 400 mrad V: 400 mrad  able to stand trigger rates up to 100 KHz up to 100 KHz  beam rate up to 10 8 Hz  minimize material + detector designed in 1996 radiator: C 4 F 10 5 m 6 m 3 m photondetectors: CsI MWPC mirrorwall vessel radiator: C 4 F 10 detection of VUV photons ( nm)

5 RICH 2004, Playa del Carmen Silvia DALLA TORRE 5 Itzhak TserruyaPlaya del Carmen, 30/11-5/12/ th RICH Workshop PHOTON DETECTION photon detectors (PD) : 5.3 m 2 MWPCs (8 chambers) with CsI photocathoderead-out: 84,000 analog read-out ch.s with extended local intelligence MWPCs with CsI photocathodes 2 CsI photocathodes, 60 x 60 cm 2 each

6 RICH 2004, Playa del Carmen Silvia DALLA TORRE 6 Itzhak TserruyaPlaya del Carmen, 30/11-5/12/ th RICH Workshop photocathodestoring glove box to handlephotocathodes photocathodetransportationsystem MWPCs WITH LARGE SIZE PHOTOCATHODES, COMPASS EXPERIENCE CsI: hygroscopic, water degrades QE never never exposed to air (max 50 ppm O 2, routinely: 10 ppm) marble table with x,y movement and microscope to solde anode wire and for dimensional checks (gaps, planarity within 100  m)

7 7 5 th International Workshop on RICH Counters ( R ICH2004) Playa del Carmen, Mexico November 30 – Dececember 5, 2004 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 J LAB H all A R ICH C OLLABORATION

8 Freon Radiator: 1800x400x15 mm 3 single box with quartz windows glued on neoceram housing Grid plane: 100  m positive wires (collects electrons ionized in the gap) Wire chamber : composed by 20  m anode wires plane sandwitched between a cathode plane formed by 100  m wires and the cathode plane formed by the photocathodes Three Photocathodes : 403x640 mm 2 each, divided in 8.4 x 8 mm 2 size pads evaporated with a 300 nm CsI layer J LAB Hall A RICH layout – similar to ALICE HMPID RICH Mauro Iodice – R ICH Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

9 P hoto c athode positioning in the glove box

10 Mauro Iodice – R ICH Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004 J LAB Hall A RICH: the evaporation system Photocathode 110 cm 120 cm mbar vacuum 2 nm/s CsI deposition at T = 60ºC (CERN experts indications). Vacuum - heating conditions starts 15 – 24 h before evaporation. A post-evaporation heat treatment is done for 12 hours. crucibles Quantum Efficiency Measurement System details in : F.Cusanno et al. NIM A502(2003)251

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

Itzhak Tserruya RICH 2004, Playa del Carmen 12 ALICE HMPID Proximity focusing RICH counters consisting of seven modules. consisting of seven modules. 15 mm thick liquid C 6 F 14 radiator (n= at = 175 nm (n= at = 175 nm) 12 m 2 CsI photocathode deposited onto the pad cathode of a MWPC. 12 m 2 of CsI photocathode deposited onto the pad cathode of a MWPC. proximity gap C 6 F 14 radiator CH 4 MWPC CsI photo- cathode 4 mm 80 mm 10mm 5 mm (see talk of A. Gallas) ( talk of H. Hoedlmoser)

Itzhak Tserruya13 The CsI evaporation station at CERN

Itzhak Tserruya14 ALICE HMPID prototype in STAR Prototype successfully tested and used in STAR See talk of Nikolai Smirnov

Itzhak Tserruya RICH 2004, Playa del Carmen 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

16 Mauro Iodice – R ICH Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004 P LAYA Del C ARMEN Event Display …there are rings too!