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La nuova elettronica di front-end per il rivelatore RICH di COMPASS Michela Chiosso Università di Torino – Dip. di Fisica Generale INFN – Sezione di Torino.

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Presentation on theme: "La nuova elettronica di front-end per il rivelatore RICH di COMPASS Michela Chiosso Università di Torino – Dip. di Fisica Generale INFN – Sezione di Torino."— Presentation transcript:

1 La nuova elettronica di front-end per il rivelatore RICH di COMPASS Michela Chiosso Università di Torino – Dip. di Fisica Generale INFN – Sezione di Torino 1th Congressino di Dipartimento Dip. di Fisica Generale A. Avogadro, 7- 8 Aprile 2008

2 Outline  Cherenkov counters  The COMPASS RICH: general description the multi-anode photomultipliers photon-detection the read-out electronics  CMAD-V3, a new front-end chip for the multi-anode photomultipliers

3 The COMPASS experiment COmmon Muon Proton Apparatus for Structure and Spectroskopy 270 physicists, 25 institutes, 11 countries  nucleon structure measurements  hadron spectroscopy measurements

4 The COMPASS spectrometer COmmon Muon Proton Apparatus for Structure and Spectroskopy

5 Cherenkov Effect cos  c =  n Particella carica Rich detector: a cherenkov counter The ingredients: 1. Radiator 2. Light collector 3. Large area photon detectors  minimizing  p.e  maximizing N p.e.

6 Cherenkov Light Imaging Technique: the first paper

7 RICH Ring Image Cherenkov Gaseous radiator; image focusing by spherical or parabolic mirrors 1977 Ypsilantis & Seguinot COMPASS RICH  gaseous radiator Particle Identification

8 COMPASS RICH Radiator  12 MWPC with CsI photocathodes  4 camera with multianode photomultipliers Photon-detectors 2 spherical mirrors:  total surface = 21m 2  Angular acceptance: ± 250 mrad horizontal; ± 180 mrad vertical Light collector C 4 F 10  transmittance > 80% ( =165 nm)  n=1.0015

9 The photon detectors FAST photon detection system MAPMTs 576 in total telescopes of fused silica lenses read-out electronics:  sensitive FE: MAD4 chip  TDC: F1 Time resolution: few ns MWPCs with CsI Photocathodes (already in use since 2001) spherical surface aspherical surface planar surface MAPMT

10 CsI MWPC MaPMT Outside MAD4 + F1 A photon-detector view… Inside

11 Phast photo-detection system Photon detectors : MAPMT  wide wavelength range  time resolution < 1 nsec  adequate for high rate operation – up to which rate ?  robust Summarising:  good for next RICH generation  but expensive for large surfaces  our challenges:  large ratio of the collection and photocathode areas with minimal image distortion  ratio = 7.3 achieved  LENS SYSTEM, critical design  make use of the UV range  fused silica LENSES couple to a read-out system able to guarantee efficiency, high rate operation and to preserve time resolution

12 Performances photons / ring (  ≈ 1) 65 time resolution <1ns  ring ≈  ring (  ≈1) : 0.3 mrad 2   /K separation at p h > 55 GeV/c Excellent suppression of  -halo high rate capability: up to 100 kHz Ch photons from physics event Ch photons from  -halo

13 Single photoelectron detection Single photoelectron detection Wide dynamic range pedestal 1 multiplication stage less 1 e all 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 bialkali photocathode, 18x18 mm 2 active surface, 16 pixels UV extended glass window with borosilicate glass (200 – 700 nm ) Hamamatsu R M16 MAPMT

14 144 DREISAM boards 36 HOT-CMC 9 CATCH 144 gigabit optical fibres 1152 MAD4 boards 144 Roof boards channel PMT MAD4 boards and Dreisam boards mounted close to the MAPMTs MAPMT readout electronics MAPMT readout electronics

15 Readout electronics of 1 quarter

16 Analog electronics: MAD4 boards + Roof board MAD4 boards + Roof board  Based on MAD4 chip: pre-amplifier + shaper + comparator  Low noise: 5-7fC  Average PMT signal: 500 fC  Up to 1MHz/channel 7 fC

17 CMAD: the new front-end chip for RICH-MAPMT. Preserve the compatibility with the existing read-out Chip designed to replace the older ASIC (MAD4) Key requirements: Gain optimized for MAPMT read-out 8 channels per chip Gain programmable channel by channel Threshold and baseline adjustable channel by channel (on board DACs) Hits rate > 5 MHz From 0.8  m BiCMOS to 0.35  m CMOS

18 CMAD 8 channels programmable gain channel by channel: from 0.4mV/fC to 1.2mV/fC in step of 0.08; additional 4x gain multiplication improved baseline restorer: able to cope with a rate > 5MHz/channel programmable threshold on each single programmable common channel threshold for 4 channels programmable baseline on each single channel 10 bits threshold DAC on chip 8 bits threshold setting the full biasing circuit is incorporated on chip CMAD versus MAD4 MAD4 4 channels fixed gain = 3.5 mV/fC baseline restorer: up to 1 MHz/channel

19 CMAD:Channel overview CMAD: Channel overview From the 1 th DAC  Variable gain preamp  shaper  baseline restorer Front-end building blocks

20 CMAD: some test results Preamplifier PreamplifierLinearity Gain Control Threshold and baseline Threshold and baselinesettings (DACs test) Channels equalization Channel speed

21 CMAD: some test results Preamplifier PreamplifierLinearity

22 CMAD: some test results Gain Control I R=R feedback C=C feedback Cdigit = Rdigit

23 CMAD: some test results Gain Control II

24 CMAD: some test results Threshold and baseline Threshold and baselinesettings (DACs test)

25 CMAD: some test results Threshold and baseline Threshold and baselinesettings (DACs test) Channels equalization

26 CMAD: some test results Channel speed

27 CMAD: In production! M.Chiosso, O. Cobanoglu, P. Delaurenti, M. Brusa, G. Mazza, D. Panzieri, A. Rivetti CMAD Team

28 Thanks to many colleagues… the COMPASS Torino group the COMPASS Torino group Raffaello GARFAGNINI Ivan GNESI Antonino GRASSO Angelo MAGGIORA Marco MAGGIORA Daniele PANZIERI Bakur PARSAMYAN Guido PIRAGINO Elena ROCCO Stefano SOSIO Maxim ALEKSEEV Antonio AMOROSO Ferruccio BALESTRA Raimondo BERTINI Maria P. BUSSA Michela CHIOSSO Marialaura COLANTONI Oleg Yu. DENISOV Andrea FERRERO Università di Torino – Dip. Di Fisica Generale A. Avogadro I.N.F.N – Sezione di Torino

29 Torino group responsabilities in COMPASS collaboration Multiwire proportional chambers (MWPCs) Rich-Wall RICH electronics and mirrors MW1 electronics Detectors Pion polarizability analysis (Primakov)  polarization analysis Drell-Yan physics at COMPASS (proposal) Hadron run coordination Physics

30 Spare Slides

31 New PID performances Michela Chiosso 10th ICATPP 09/10/2007 Kaons identification efficiency  PID efficiency studies based on kaons from decay of exclusive    Ch.threshold < p k < 60 GeV/c)

32 New PID performances Michela Chiosso 10th ICATPP 09/10/2007 efficiency vs θ k 2006 data

33 10 bit DAC


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