Itzhak TserruyaItzhak Tserruya RICH 2004, Playa del CarmenRICH 2004, Playa del Carmen 11

RICH 2004RICH 2004Playa del Carmen, MexicoPlaya del Carmen, Mexico

Nov. 30 – Dec. 5, 2004Nov. 30 – Dec. 5, 2004

Itzhak TserruyaItzhak Tserruya

Short report from RICH 2004 at Short report from RICH 2004 at Playa del Carmen Playa del Carmen

Itzhak TserruyaItzhak Tserruya RICH 2004, Playa del CarmenRICH 2004, Playa del Carmen 22

There are three experiments that have There are three experiments that have constructed or are constructing RICH constructed or are constructing RICH counters with CsI photocathodes:counters with CsI photocathodes:– COMPASS COMPASS – RICH detector for kaon Physics in Hall A at RICH detector for kaon Physics in Hall A at

Jefferson LabJefferson Lab– ALICE (STAR)ALICE (STAR)

RICH 2004, Playa del CarmenRICH 2004, Playa del Carmen Silvia DALLA TORRE Silvia DALLA TORRE 33

Itzhak TserruyaItzhak TserruyaPlaya del Carmen, 30/11-5/12/2004 - 5Playa del Carmen, 30/11-5/12/2004 - 5thth RICH Workshop RICH Workshop 33

SM1 dipoleSM1 dipole

SM2 dipole

Polarised Target

HCAL1

Muon-filter1,MW1

Micromegas,DC,SciFi

Gems,SciFi,DCs,straws

MWPC Gems Scifi

trigger-hodoscopes

Silicon

COMPASS COMPASS SPECTROMETERSPECTROMETER

RICH_1

BMS

Gem_11

ECAL2,HCAL2

straws,MWPC,Gems,SciFi

straws Muon-

filter2,MW2

DW45

SciFi

Veto

Beam: 160 GeV µ+

2 . 108 µ/spill

(4.8 s/16.2s)

P ~ 80%

44 44

COMPASS RICH-1 - DESIGNCOMPASS RICH-1 - DESIGN

from the experiment design:from the experiment design:

hadron PID up to ~50 GeV/chadron PID up to ~50 GeV/c LARGE acceptance (large LARGE acceptance (large

size): size):

H: 500 mrad H: 500 mrad

V: 400 mrad V: 400 mrad

able to stand trigger rates able to stand trigger rates

up to 100 KHzup to 100 KHz beam rate up to 10beam rate up to 1088 Hz Hz minimize materialminimize material

+ detector designed in 1996+ detector designed in 1996

radiator:radiator:

CC44FF1010

5 m

5 m

6 m6 m3 m3 m

photon photon detectors:detectors:CsI MWPCCsI MWPC

mirrormirrorwallwall

vesselvessel

radiator:radiator:

CC44FF1010

detection of detection of VUVVUV photons photons(165-200 nm)(165-200 nm)

RICH 2004, Playa del CarmenRICH 2004, Playa del Carmen Silvia DALLA TORRE Silvia DALLA TORRE 55

Itzhak TserruyaItzhak TserruyaPlaya del Carmen, 30/11-5/12/2004 - 5Playa del Carmen, 30/11-5/12/2004 - 5thth RICH Workshop RICH Workshop 55

PHOTON DETECTIONPHOTON DETECTIONphoton photon

detectorsdetectors (PD) : (PD) :

5.3 m5.3 m22 MWPCs MWPCs

(8 chambers)(8 chambers)

with with CsI CsI

photocathodephotocathode

read-out:read-out:

84,000 analog84,000 analog

read-out ch.sread-out ch.s

with extended with extended

local intelligencelocal intelligence

MWPCs with MWPCs with

CsI photocathodesCsI photocathodes

2 CsI 2 CsI photocathodes,photocathodes,60 x 60 cm60 x 60 cm2 2 eacheach

RICH 2004, Playa del CarmenRICH 2004, Playa del Carmen Silvia DALLA TORRE Silvia DALLA TORRE 66

Itzhak TserruyaItzhak TserruyaPlaya del Carmen, 30/11-5/12/2004 - 5Playa del Carmen, 30/11-5/12/2004 - 5thth RICH Workshop RICH Workshop 66

photocathodephotocathodestoringstoring

glove box to glove box to handle handle photocathodesphotocathodes

photocathode photocathode transportation transportation systemsystem

MWPCs WITH LARGE SIZE MWPCs WITH LARGE SIZE PHOTOCATHODES, PHOTOCATHODES, COMPASS EXPERIENCECOMPASS EXPERIENCE

CsI: hygroscopicCsI: hygroscopic,,water degrades QEwater degrades QE never never exposed to airexposed to air(max 50 ppm O(max 50 ppm O2 ,2 ,

routinely: 10 ppm)routinely: 10 ppm)

marble tablemarble table with x,y with x,y movement and microscopemovement and microscopeto solde to solde anode wireanode wire and for and fordimensional checksdimensional checks (gaps, (gaps, planarity within 100 planarity within 100 m)m)

77 77

5th International Workshop on RICH Counters (RICH2004) 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

JLAB Hall A RICH

COLLABORATION

8

Freon Radiator: 1800x400x15 mm3 single box with quartzwindows 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 mm2 each, divided in 8.4 x 8 mm2 size pads evaporated with a 300 nm CsI layer

JLAB Hall A RICH layout – similar to ALICE HMPID RICH

Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

9

Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

Photocathode positioning in the glove box

10

Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

JLAB Hall A RICH: the evaporation system

Photocathode

110 cm

120

cm

10-6 mbar vacuum2 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

MeasurementSystem

details in : F.Cusanno et al.NIM A502(2003)251

Itzhak TserruyaItzhak Tserruya RICH 2004, Playa del CarmenRICH 2004, Playa del Carmen 1111

ALICE HMPID 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 TserruyaItzhak Tserruya RICH 2004, Playa del CarmenRICH 2004, Playa del Carmen 1212

ALICE HMPID ALICE HMPID Proximity focusing RICH counters Proximity focusing RICH counters

consisting of seven modules.consisting of seven modules.

15 mm thick liquid C15 mm thick liquid C66FF1414 radiator radiator

(n= 1.2988 at (n= 1.2988 at = 175 nm = 175 nm) 12 m12 m22 of CsI photocathode CsI photocathode deposited onto the pad cathode of deposited onto the pad cathode of a MWPC.a MWPC.

proximity gap

C6F14 radiator

CH4

MWPCCsI photo-cathode 4 mm

80 mm

10mm

5 mm

(see talk of A. Gallas)

( talk of H. Hoedlmoser)

Itzhak TserruyaItzhak Tserruya 1313

The CsI evaporation station at CERN The CsI evaporation station at CERN

Itzhak TserruyaItzhak Tserruya 1414

ALICE HMPID prototype in STAR ALICE HMPID prototype in STAR

Prototype successfully tested and used in STAR

See talk of Nikolai Smirnov

Itzhak TserruyaItzhak Tserruya RICH 2004, Playa del CarmenRICH 2004, Playa del Carmen 1515

Summary

No one has used a dry room for CsI No one has used a dry room for CsI handling. If we want to use we will have to handling. If we want to use we will have to prove that it does not affect the QE.prove that it does not affect the QE.

There is a lot of experience and know how There is a lot of experience and know how around around A. Braem from CERN A. Braem from CERN

16

Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

PLAYA Del CARMEN Event Display …there are rings too!