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Il RICH-1 di COMPASS dopo l'upgrade:progetto, realizzazione e caratterizzazione del
rivelatore durante la presa dati 2006
M. Chiosso Congressino di Sezione, Torino 23/01/07
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The RICH upgrade
Introduction
Motivation of the project
The detector upgradeopticsphoton detectorsread-out electronicsinstallation
Preliminary characterization
Project of an upgraded front-end chip: C-MAD
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The COMPASS experimentCOmmon Muon Proton Apparatus for Structure and Spectroskopy
nucleon structuremeasurements
hadron spectroscopy measurements
270 physicists, 25 institutes, 11 countries
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The COMPASS experimentCOmmon Muon Proton Apparatus for Structure and Spectroskopy
Approved by CERN in October 1998
2001: technical run
2002-2004: physics runs
2005: spectrometer upgrade (during shutdown of CERN accelerator)
2006: resumed data taking
Up to now only muon data were taken, apart from a two weeks pilot run with pion beam, in 2004
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The COMPASS spectrometerCOmmon Muon Proton Apparatus for Structure and Spectroskopy
Rich
Magnete SM1
Magnete SM2
HCAL1
ECAL1
ECAL2
HCAL2
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Il RICH di COMPASS
5 m5 m
6 m6 m3 m3 m
mirrormirrorwallwall
vesselvessel
radiator:radiator:CC44FF1010
photon photon detectors:detectors:CsI MWPCCsI MWPC
radiator gas: C4F10
mirrors: 21 m2 di superficie
photon-detectors: Multi Wire Proportional Chamber (MWPC):82944 18x18 mm2 pad channels
Angular acceptance: horizontal ±250 mrad, vertical ±180 mrad
Wavelength range: 165 nm 200 nm
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The upgrade motivationsReadout electronics based on Gassiplex chip (3μs integration time)
THE EXPERIMENTAL ENVIRONMENT:
large photon flux in the center (μ-halo)
high uncorrelated background
New photon detection with MaPMT:
excellent time-resolution μ-halo rejected
using time information
In addition, higher rate operation:
previously: 20 kHz
now: up to 100 kHz
overlap of overlap of event event images:images:μμ beam beam halohalo
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The upgrade project
FAST photon detection system
• MAPMTs 576 in total• telescopes of fused silica lenses
• read-out :sensitive FE: MAD chipTDC: F1
Time resolution: few ns
MWPCs with CsI Photocathodes(already in use since 2001)
read-out: APV chipnegligible dead timetime resolution (MWPC + r-o):~ 3 μs ~ 400 ns
NOT DISCUSSED IN THIS TALKNOT DISCUSSED IN THIS TALK
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Performances
photons / ring (photons / ring (β β ≈ ≈ 1)1)1414
σσθθ--phph (β ≈≈1) : 1.2 mrad
σσring ring (β ≈≈1) : 0.6 mrad
2.5σ π/K separation up to 43 GeV/c
Before upgradephotons / ring (photons / ring (β β ≈ ≈ 1)1)
5050--6060
σσθθ--phph (β ≈≈1) : 1.7 mrad
σσring ring (β ≈≈1) : 0.4 mrad
2.5σ π/K separation up to 50GeV/c
Expected after upgrade
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Upgraded Rich resolution
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Phast photo-detection system
Photon detectors : MAPMTwide wavelength rangetime resolution < 1 nsecadequate for high rate operation – up to which rate ?robust
Summarising:good for next RICH generationbut expensive for large surfaces
our challanges:large ratio of the collection and photocathode areaswith minimal image distortion
ratio = 7.3 achieved LENS SYSTEM, critical designmake use of the UV range fused silica LENSEScouple to a read-out system able to guarantee efficiency, highrate operation and to preserve time resolution
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576 telescopes
Purpose: focusing cherenkov photonson MaPMTs
UV transparent quartz lenses
Large geometrical acceptance
Minimum image distortion
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Mapmt
Hamamatsu R7600-03-M16:
bialkali photocathode, 18x18 mm2 active surface, 16 pixels
UV extended glass window with borosilicate glass(200 – 700 nm)
PMT in soft iron box
B<10G
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Single photoelectron detection
Wide dynamic range
0 100 200 300 400 500 600
hEntries 250000
Mean 76.53
RMS 58.02
Underflow 0
Overflow 0
0 100 200 300 400 500 600
200
400
600
800
1000
1200
1400
freeEntries 250000
Mean 76.53
RMS 58.02
Underflow 0
Overflow 0
pedestal1 multiplication stage less
1 e
2 eall these photoelectrons must be detected for good efficiency
~ 270 fC~ 30 fC ~ 90 fC
Hit multiplicity per event vs threshold
Large flat region between cross-talk and detection losses region
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Detection at high rate
mean signal amplitude versus rate/pixelpulsed light source synchronus to trigger + random background from lamp
measured for single photoelectronmeasured for single photoelectron
Working HV Working HV
Goal Goal (for the future (for the future needs of COMPASS): needs of COMPASS): operate up to operate up to 5MHz/pixel5MHz/pixel single single photoelectron ratesphotoelectron rates
no rate limitation from MAPMT
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MaPMT readout
144 DREISAM cards
36 HOT-CMC
9 CATCH
144 gigabit optical fibres
1152 MAD cards
144 roofboards
57616-channelPMT
MAD cards and Dreisamcards mounted close to the MAPMTs
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FE electronics:MAD cards + roof board
Based on MAD4 chip: Pre-amplifier + shaper + comparator
Low noise (connected to PMT): 5-7fC
Average PMT signal: 1pC
Up to 1MHz/channel
TORINOTORINO
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Digital readout electronics:DREISAM card
Based on dead-time free F1-TDC chip
64 channels per board
Time resolution < 120 ps
Max rate per channel: up to 10 MHzat 100 kHz trigger rate
hits
physics signal
1 MHz randombackground
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Readout electronics of 1 quarter
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A full detector
Both cameras installed ready for beamJune 2006
Data taking during Compass run 2006
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Installation
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Installation
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Milestones and Status
Preliminary studies up to October 2004Project design: November 2004 – March 2005Material procurement and constructions: April 2005 - March 2006Assembly: April-May 2006Ready for beam: June 2006Characterization from data 2006 goin onNext future upgrade: C-MAD project
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First look on 2006 RICH data
Time spectrum Cherenkov ring
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Performances of the upgraded MaPMT RICH (2006 data, preliminary)
Number of photons per ring at saturation:65 (before 14)
Time resolution:≈ 1 ns (3 ms)
Ring resolution: 0.36 mrad (0.5 mrad)
Improved suppression of backgroundfrom μ-halo
prelim
inary
ΘΘparticleparticle<30 <30 mradmrad
3030--60 60 mradmrad
120120--150 150 mradmrad
150150--180 180 mradmrad
9090--120 120 mradmrad
6060--90 90 mradmrad
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New PID performances
π
K
p
prelim
inary
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Future upgrade:C-MAD
CMAD, an upgrade of MAD4 chipfor Compass Rich-1:
characterization of the prototype
O. Cobanoglu, M. Chiosso, G. Mazza, D. Panzieri, A. Rivetti
I.N.F.N & University of Torino
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CMAD-V2 full size prototype
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
FE
DAC b0
b7
One shot LVDSin
out +
out -
8 channels full-custom Asic prototype
each single channel consists of:a pre-amplifier with adjustable R-C feedback networka shaper with baseline restorera comparator with adjustable thresholdprogrammable one-shotLVDS output driver
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MAD4
C-MADV2
Efficiency at high rate
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Time Schedule
End of february submission of the third prototype
End of february – End of may design and production of new front-end boards
End of may prototype delivering
June test of prototype chips mounted on new front-end boards
June and July full test of the prototype
End of july start of mass production
End of october delivery of whole production (chips and boards)
november - december mounting and testing
January 2008 ready to install
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Thanks to many colleagues…The COMPASS RICH upgrade team: