HERMES_RICH

EIC Detector – JLab – 04/June/2010

EIC Detector Workshop

JLab : 4-5/June/2010









HERMES: Forward RICH Detector



Evaristo Cisbani / INFN-Rome Sanità Group









Cisbani / HERMES RICH

Most of the slides from R. De Leo and D. Ryckbosch





• Overview

• Performances

• Inheritance

• HERMES RICH in SBS HallA

• Aerogel RICH in CLAS12

1

HERMES Experimental Setup









EIC Detector – JLab – 04/June/2010

e+N  e’ + h +X in DIS









Cisbani / HERMES RICH

2 identical RICH modules





2

Hadron PID: HERMES RICH









EIC Detector – JLab – 04/June/2010

Identify p, K and p

from 2 to >12 GeV/c 5.5 GeV K+



C4F10 gas







REAL DATA from NIMA 479 (2002) 511









Cisbani / HERMES RICH

14.6 GeV e-

1.5 GeV p-









aerogel







Two radiators: aerogel and gas

PMTs as photon detector gas

Focusing Optics

Reference: NIMA 479 (2002) 511-530 3

HERMES RICH module layout









EIC Detector – JLab – 04/June/2010

147





63









101









Cisbani / HERMES RICH

180

48









281 126



unit is cm

4

Radiators









EIC Detector – JLab – 04/June/2010

Aerogel









Dirk Rickbosch – DESY07









(Absorb otherwise randomly

reflected photons)









Cisbani / HERMES RICH

(cut photons with l5GeV) plot vs day









4

1









Cisbani / HERMES RICH EIC Detector – JLab – 04/June/2010

average n (e+>5GeV)









EIC Detector – JLab – 04/June/2010

Dn ~

0.0003









Cisbani / HERMES RICH

Dn ~

0.0003









Dn ≈ 3 *10-4 in 10 years!

Dn ≈ 1*10-4 in the last 5 years! 1

5

one RICH module preserved @ UVa (thanks to G. Cates)









EIC Detector – JLab – 04/June/2010

HERMES

RICH









Cisbani / HERMES RICH

Aerogel Spare









Now stored at UVa under safe/controlled conditions + additional wall of spare 1

Aerogel from the other module. 6

EIC Detector – JLab – 04/June/2010

SIDIS (Cond. appr. Exp.): Setup and parameters



e+3He→e’+p(K)+X





BB: e-arm at 30o

 = 45 msr

GEM Tracker

Gas Cherenkov

Shower









Cisbani / HERMES RICH

 GMn/PR-09-019

SBS: h-arm at 14o

 = 50 msr

GEM tracker

excellent PID / RICH

Hadron CALO



Event rate: ~104×HERMES

Beam: 50 mA, E=8.8 and 11 GeV (80% long. Pol.) 60 days of production

Target: 65% polarized 3He  GEn(2)/PR-09-016 expected stat. accuracy:

 Luminosity: 1.4×1037 cm-2s-1 10*better than HERMES on 1

7

proton

HERMES RICH in SBS (SIDIS Exp.)









(old GEM setup)

8

1









Cisbani / HERMES RICH EIC Detector – JLab – 04/June/2010

RICH detector in CLAS12









EIC Detector – JLab – 04/June/2010

Main Requirements:

1. separation up to 8 GeV/c

2. from 5 to 40 degree polar angle

3. p/K rejection>100 (<1% p contamination)

4. minimize material budget



Substitute 2 LTCC sectors with a RICH detector

Possible option: aerogel + SiPM (with time

correlation) RICH









Cisbani / HERMES RICH

GeV

1 2 3 4 5 6 7 8 9 10

/c

TOF



p/K LTCC

HTCC

TOF



p/p LTCC

HTCC

TOF

K/p LTCC  ratio K/p ~ 0.1-0.15 1

9



From. M. Contalbrigo

Aerogel characteristics improvements









EIC Detector – JLab – 04/June/2010

Cisbani / HERMES RICH

2005 IEEE Nuclear Science Symposium Conference Record

M. Tabata et al.

2

0

EIC Detector – JLab – 04/June/2010

Aerogel RICH with 2 x mirrors

35o

Proximity between 5 and 10

degree 25o

Focusing

Mirrors acts at polar angle mirror 20o

above 10 degree Photon

detectors

10o





Target 5o



Beam

Doubled detector area









Cisbani / HERMES RICH

Focusing mirrors to reduce

detector area to ~ 2 m2/sec



Relax performance requests

for the external half (lower p)



Increase pad size

Reduce channel number

Standard PMTs



Similar to i.e. LHC-b !!! 2

1



From. M. Contalbrigo

EIC Detector – JLab – 04/June/2010

Aerogel RICH with mirror & semi-reflective layer

35o



25o

Proximity up to 15 degree

20o

Mirror above 15 degree





10o





Target 5o



High density of hits Semi-reflective Beam

check with track multiplicity mirror









Cisbani / HERMES RICH

Photon

detector

Too high absorption in aerogel

semi-reflective mirror



Reduced collection efficiency

(bi-alcali q.e. 25 %)

ultra bi-alcali q.e. 45 %

cost increases by 50 %



New concept !!!



2

2



From. M. Contalbrigo

Summary









EIC Detector – JLab – 04/June/2010

• HERMES RICH designed and built in ~2 years

– Configuration: Mirror Focusing, dual radiator, with PMT readout

– First RICH using aerogel radiator in a real experiment

– Very stable performance in 10 years

• HERMES RICH “inheritance”:

– H-RICH for SIDIS physics in SBS/Hall A

– CLAS12 p-K-p PID detector (work in progress!)









Cisbani / HERMES RICH

• Presently available improvements (at reasonable price):

– Better aerogel (higher transmission and reduced scattering)

– Smaller photon detectors: multianode PMTs, SiPM (with time

information)

– Improved mirrors





2

Recent RICH 2010 conference: http://rich2010.in2p3.fr/ 3