EIC Detector – JLab – 04/June/2010 Cisbani / HERMES RICH 1 HERMES: Forward RICH Detector Evaristo Cisbani / INFN-Rome Sanità Group Most of the slides from R. De Leo and D. Ryckbosch EIC Detector Workshop JLab : 4-5/June/2010 • Overview • Performances • Inheritance • HERMES RICH in SBS HallA • Aerogel RICH in CLAS12
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EIC Detector – JLab – 04/June/2010 Cisbani / HERMES RICH 1 HERMES: Forward RICH Detector Evaristo Cisbani / INFN-Rome Sanità Group Most of the slides from.
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EIC
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b –
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1
HERMES: Forward RICH Detector
Evaristo Cisbani / INFN-Rome Sanità Group
Most of the slides from R. De Leo and D. Ryckbosch
EIC Detector WorkshopJLab : 4-5/June/2010
• Overview
• Performances
• Inheritance• HERMES RICH in SBS HallA
• Aerogel RICH in CLAS12
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HERMES Experimental Setup
e+N e’ + h +X in DIS
2 identical RICH modules
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Hadron PID: HERMES RICH
Two radiators: aerogel and gasPMTs as photon detectorFocusing Optics
5.5 GeV K+
14.6 GeV e-1.5 GeV -
REAL DATA from NIMA 479 (2002) 511
C4F10 gas
Reference: NIMA 479 (2002) 511-530
Identify , K and pfrom 2 to >12 GeV/c
aerogel
gas
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HERMES RICH module layout
126
unit is cm
147
63
101
18048
281
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Radiators
C4F10 Gas at STPn(633 nm)=1.00137
Refractive Index n(633 nm)=1.03
Dirk Rickbosch – DESY07
Scattering//Absorption Length(400 nm) = 2.3 cm
Aerogel
(cut photons with <300 nm)
(Absorb otherwise randomly reflected photons)
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Optics
not aligned
aligned
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Photon Detector plane
¾ inch diameter
+ single PMT 100 m Metal sheet wrap
up to 90 G magnetic field
Size of the detector and
diameter of the PMT defined by cost constraint
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Light Collection
Dirk Ryckbosch – DESY07
Funnel collection efficiency
Nov 98
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Electronics
VME based, 20 MHz bus from front-end to VME
less than 30 s to transfer data to VME
able to keep data up to 800 ns (selectable) since trigger
down to 50 ns gate width
No time information
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One RICH Module during installation
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Rings and identification probability matrix
K
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Reconstructed angle and number of photoelectrons
electrons
Npe = 10
Npe = 12
gas
aerogel
aero=7.6 mrad
gas=7.5 mrad
aerogel
gas
efficiencyRayleigh scattering ~-4
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Exp. angle resolution (%)
HERMES: Largest error from pixel size; by design (cost-performance tradeoff)