RICH detector for CLASS12 E.Cisbani INFN-Rome and ISS CLASS12-RICH Working Group Meeting

07 Aug 2008 E. Cisbani / Class12-RICH

RICH detector for CLASS12E.Cisbani

INFN-Rome and ISS

CLASS12-RICHWorking Group Meeting

07 August 2008


Hadron PID in Class12 BaselineGeV/c 1 2 3 4 5 6 7 8 9 10

/KTOF

LTCCHTCC

/pTOF

LTCCHTCC

K/pTOF

LTCC

• /K PID rely on LTCC performance in 3-5 GeV/c• (No K/p PID in 5-8 GeV/c)

RICH


Which RICH?• Liquid Radiator (Freon)

– Cover up to 5 GeV/c– Relatively inexpensive

(proximity focusing RICH)

• Aerogel + Gas Radiators– Cover up to 12 GeV/c– Very expensive

Cost: Aerogel RICH ~ 5 x Proximity Focusing RICH


Location of the RICH ?Replace part of LTCC:- No impact on

baseline design- Nobody will

probably complain- Large space

available (and to be covered!)

Add to HTCC:- Impact on baseline design- somebody will probably

complain


LTCC SectorAbout 6.2 m2

entrance window

1 m depth


Proximity Focusing RICH


Gap: 600 mmFreon Thick: 20-30 mm (?)

Resolution: 1.5-1.8 mradChannels: 70 k

Proximity RICH Performance 1/2

(Assume full detection acceptance)


Proximity RICH: Performance 2/22 cm radiator:p/K separation upto 4.2 GeV/c withsuperior rejection(1:1000) and high K efficiency (93%)

with 3 cm radiator:same performance up to 4.7 GeV/c


Proximity RICH in LTCC• The RICH replaces 2 adjacent sectors

of LHCCTwo radiatorsOne photon detector

Entrance window ~ 12 m2

Detection area ~ 16 m2

Readout Chs ~ 80000


HallA Proximity RICH Now in EEL/122

Will be used in the Transversityexperiment next October


Quarz planarity e parallelism 0.1 mm


Evaporation Fac. & QE Meas. CsI is evaporated on the pad panel in the evaporation chamber: 120h x 110r cm2 (vacuum 10-7 mbar)


Recent CsI Evaporation (July08)


Hall A RICH in Hypernuclear Exp. (2003-2005)

K/ rejection ~ 1/1000

F. Garibaldi et al. NIM A502 (2003)


Photon Detector• Replace MWPC with GEM Chamber

– faster,– higher gain,– stability at high rate

HBD @ Phenix


Costs (!very preliminary!)

HallA RICH Factor Class12 RICH

Readout 95 4 380 (15%)

MWPC: Pads Planes 20 10 200 (8%)

MWPC: Parts (Macor Insulator) 15 10 150 (6%)

Freon (C6F14) 20 40 800 (33%)

Quartz+Neoceram 30 20 600 (24%)

Mechanical Structure 30 10 300 (12%)

Evaporation Fac. 500 1 500 (exist)

Freon Recirculation System 20 (?) 1.5 30 (?)

Total 210+520 2420+530

Class12/HallaRadiator 36-48 (min.-max. volume), 24 (surface)Detector 13 (surface), 4 (chs)

GEM ~ 1.2 x MWPC k$(estimation from Lire, CHF, $ and Euro)


Aerogel in HTCCValeryKubarovsky

Main Issues:- Aerogel add 2-3% X0- Online trigger may be

challenging

- HTCC design shall be revised

- Impact on tracking ?

- Cost probably higher than LTCC option (but full acceptance)


Aerogel RICH: successful in HERMES

• Pixel 2.3• Mirror 0.6• Point emiss. 0.7 • n disp. 0.5• Chromatic 1.3• Forw.Scatt. 0.4• Surface 0.4• Total (calc.)/pe 2.9• Total (exp.)/pe 3.3 • Npe (exp.) 10

One HERMES RICHdetector soon at U.Va.


Aerogel RICH / expected to be better in future

0

0.2

0.4

0.6

0.8

1

100 200 300 400 500 600 700 800

T %

wavelength (nm)

’80s

1996

2004

t

Aerogel improvements Matsushita100x100x20mm3 n=1.050

Dalla Torre / RICH04

… and smaller pixel size

Aerogel cost ~ 4 $/cm3


Conclusion?• Proximity RICH in 2 LTCC sectors should

provide:/K rejection better than

• 1:1000 up to 4.2 GeV/c (worst case)• 1:1000 up to 4.7 GeV/c (best case) • 1:100 up to 5 GeV/c (K efficiency > 90%)

• Costs about $ 2.5M

• Aerogel option should be investigated further


Documents

RICH detector for CLASS12 E.Cisbani INFN-Rome and ISS CLASS12-RICH Working Group Meeting