1. RICH detector for CLASS12
E.Cisbani
INFN-Rome and ISS
CLASS12-RICH
Working Group Meeting
07 August 2008
07 Aug 2008
E. Cisbani / Class12-RICH

2. Hadron PID in Class12 Baseline
GeV/c 1 2 3 4 5 6 7 8 9 10
p/K
TOF
LTCC
HTCC
p/p
K/p
p/K PID rely on LTCC performance in 3-5 GeV/c
(No K/p PID in 5-8 GeV/c)
 RICH
07 Aug 2008
E. Cisbani / Class12-RICH

3. Which RICH? Liquid Radiator (Freon) Aerogel + Gas Radiators
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
07 Aug 2008
E. Cisbani / Class12-RICH

4. 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
07 Aug 2008
E. Cisbani / Class12-RICH

5. LTCC Sector About 6.2 m2 entrance window 1 m depth 07 Aug 2008
E. Cisbani / Class12-RICH

6. Proximity Focusing RICH
07 Aug 2008
E. Cisbani / Class12-RICH

7. Proximity RICH Performance 1/2
Gap: mm
Freon Thick: mm (?) 
Resolution: mrad
Channels: 70 k
(Assume full detection acceptance)
07 Aug 2008
E. Cisbani / Class12-RICH

8. Proximity RICH: Performance 2/2
2 cm radiator:
p/K separation up
to 4.2 GeV/c with
superior rejection
(1:1000) and high
K efficiency (93%)
with 3 cm radiator:
same performance up to 4.7 GeV/c
07 Aug 2008
E. Cisbani / Class12-RICH

9. Proximity RICH in LTCC The RICH replaces 2 adjacent sectors of LHCC
Two radiators
One photon detector
Entrance window ~ 12 m2
Detection area ~ 16 m2
Readout Chs ~ 80000
07 Aug 2008
E. Cisbani / Class12-RICH

10. HallA Proximity RICH Now in EEL/122 Will be used in the Transversity
experiment next October
07 Aug 2008
E. Cisbani / Class12-RICH

11. Quarz planarity e parallelism 0.1 mm
07 Aug 2008
E. Cisbani / Class12-RICH

12. Evaporation Fac. & QE Meas.
CsI is evaporated on the pad panel in the evaporation chamber: 120h x 110r cm2 (vacuum 10-7 mbar)
07 Aug 2008
E. Cisbani / Class12-RICH

13. Recent CsI Evaporation (July08)
07 Aug 2008
E. Cisbani / Class12-RICH

14. Hall A RICH in Hypernuclear Exp. (2003-2005)
K/p rejection ~ 1/1000
F. Garibaldi et al. NIM A502 (2003)
07 Aug 2008
E. Cisbani / Class12-RICH

15. Photon Detector Replace MWPC with GEM Chamber faster, higher gain,
stability at high rate
Phenix
07 Aug 2008
E. Cisbani / Class12-RICH

16. Costs (!very preliminary!)
Class12/Halla
Radiator (min.-max. volume), 24 (surface)
Detector 13 (surface), 4 (chs)
HallA RICH
Factor
Class12 RICH
Readout 95 4
380 (15%)
MWPC: Pads Planes 20 10
200 (8%)
MWPC: Parts (Macor Insulator) 15
150 (6%)
Freon (C6F14) 40
800 (33%)
Quartz+Neoceram 30
600 (24%)
Mechanical Structure
300 (12%)
Evaporation Fac.
500 1
500 (exist)
Freon Recirculation System
20 (?)
1.5
30 (?)
Total k$
(estimation from Lire, CHF, $ and Euro)
GEM ~ 1.2 x MWPC
07 Aug 2008
E. Cisbani / Class12-RICH

17. Aerogel in HTCC Valery Main Issues: Kubarovsky 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)
07 Aug 2008
E. Cisbani / Class12-RICH

18. Aerogel RICH: successful in HERMES
One HERMES RICH
detector soon at U.Va.
Pixel
Mirror
Point emiss
n disp
Chromatic
Forw.Scatt
Surface
Total (calc.)/pe 2.9
Total (exp.)/pe
Npe (exp.)
07 Aug 2008
E. Cisbani / Class12-RICH

19. Aerogel RICH / expected to be better in future
Aerogel improvements
Matsushita
100x100x20mm3 n=1.050
’80s
1996
2004 t
Aerogel cost ~ 4 $/cm3
… and smaller pixel size
Dalla Torre / RICH04
07 Aug 2008
E. Cisbani / Class12-RICH

20. Conclusion? Proximity RICH in 2 LTCC sectors should provide:
p/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
07 Aug 2008
E. Cisbani / Class12-RICH

21. 07 Aug 2008
E. Cisbani / Class12-RICH