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MICE calorimeter R_D

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					                  CHIPP Workshop on Detector R&D
                   11-12 June - University of Geneva




              MICE Calorimeter R&D
                  Jean-Sebastien Graulich, Univ. Genève


                  o   Introduction to MICE
                  o   The MICE Calorimeter
                  o   Sensor and Electronics
                  o   Test beam results
                  o   Future developments
                  o   Conclusion


CHIPP June 2008             Jean-Sébastien Graulich
                  Introduction

                                        MICE is Accelerator
                                         Physics more than HEP
                                        MICE is part of the R&D
                                         program towards the
                                         neutrino factory
                                        Aim at Demonstrating
                                         Ionization Cooling of a
                                         muon beam
                                        Validate new simulation
                                         tools for future design
                                        MICE should deliver
                                         results before 2011



CHIPP June 2008     Jean-Sébastien Graulich               Slide 2
                  MICE Design
                        Focus coils and
                        LH2 Absorbers




                           Coupling coils and
                         200 MHz RF Cavities

                      Solenoids, Matching coils and
                       Scintillating fiber Tracker




CHIPP June 2008     Jean-Sébastien Graulich           Slide 3
                  MICE PID Design
         Time of Flight Stations




     Some Beam
     Optics here


                                                 Electron/Muon Calorimeter


           Cherenkov Counters


CHIPP June 2008        Jean-Sébastien Graulich                     Slide 4
              MICE Status @ RAL, UK
Pion production and                         MICE hall at RAL
capture in ISIS vault




                                                   Pion decay solenoid (PSI)




                                  First beam
                                  Protons/Pions



    CHIPP June 2008     Jean-Sébastien Graulich                    Slide 5
              MICE Electron-Muon Calorimeter

            Aim at separating muons from decay electrons
            Necessary to reduce systematic errors on emittance
             measurement

Muons and electrons have
≠ Single Particle Emittance




     CHIPP June 2008          Jean-Sébastien Graulich             Slide 6
                 Electron Muon Separation
         Muons and electrons have
         Overlapping Pz in the Tracker
         (where it is measured)




                                         Time of flight is not sufficient to separate them




     CHIPP June it was goingJean-Sébastien Graulich nobody was right.“ 7
“Nobody said2008             to be easy, and                      Slide
                                                    President George Bush, quoted by Rikard Sandstroem
                      EMCal Conceptual Design
           Design proposed by Geneva
                 Reduce the need for charge measurement (ADC are expensive, aren’t they…)
                 Backboned by detailed simulation
           Made of two parts:
                 High Z active pre-shower layer: Forces electrons to shower
                 Thick stack of plastic scintillator:
                  Stop the muons
                  Measure range and track topology




e+
µ+


         CHIPP June 2008             Jean-Sébastien Graulich                     Slide 8
         Pre-shower: KLOE Like




CHIPP June 2008   Jean-Sébastien Graulich   Slide 9
                        KL Construction
   Produced by INFN Roma III
   “In the mail” to RAL
   Coupled to individual PMTs
   Readout by 100 MHz
    waveform digitizer (after shaper)
          This gives both charge and
           time (< 1 ns) information
                                                       KL + shielding
KL Naked
                                            9400                                          V1724 - Seq
                                                                                 norm        2236    +_264.6
                                            9200                                 t           6.177   +_0.839
                                                                                 t0          1.666   +_ 0.321
                                                                                 t0          27.48   +_   0.33
                                                                                 offset      8194    +_     7.1
                                            9000


                                            8800
                                                                             Signal Shape
                                            8600                             well understood
                                            8400

    CHIPP June 2008               Jean-Sébastien Graulich
                                            8200                                  Slide 10
                                                   0   20       40      60         80                100
          Scintillator Wall (SW)
                               ~1 m3 bloc of scintillator
                               Longitudinal segmentation needed
                                to measure the range
                                      Increasing thickness optimize the
                                       relative precision on the range w.r.t
                                       the number of readout channels
                               Transverse segmentation needed
                                to reduce the occupancy per
                                channel
                               Main issue:
                                Muons stopping in the EMCal
                                produce background when they
                                decay
                                      At equilibrium: ~1 muon in the
                                       detector at all time



CHIPP June 2008   Jean-Sébastien Graulich                          Slide 11
                            SW R&D

    Use extruded scintillators + WLS fibers
          A la Minerna
          First prototype built in INFN Trieste using rectangular
           shape scintillator received from Fermilab

                                                             19 mm




                                                                           15 mm




CHIPP June 2008           Jean-Sébastien Graulich               Slide 12
                                      Full scale single Layer Prototype




1/5 scale 2x4 Layers Prototype      Simple mechanical assembly
                                         Easily stackable
                                    Assembled, equipped and
                                     tested in Trieste
                                    Has been tested in beam at
                                     CERN last week
              SW Light Sensor choice



                              Two Options




    Multi-Anode PMTs
          Like in Minerna itself
          64 or 256 channels per PMT
          Last dynode can be used to measure the total energy deposit per
           plane.
    SiPM (or Hamamatsu MPPC)
          Like in T2K (P0D for example)
          Give some d.o.f. for the mechanical assembly

CHIPP June 2008            Jean-Sébastien Graulich                  Slide 14
            SW Front-End Electronics
    TDC with ~1.5 ns resolution is cheap
          Discriminator from existing ASIC (e.g. VA64TAP2.1)
          A simple FPGA can give the time w.r.t trigger
          ~ 20 CHF/channel can be achieved
    ADC is more expensive
          In particular if dead time has to be small
          Commercial waveform digitizer @ 1 GHz: ~2000 CHF/ch
                 Note that cost decreases rapidly for lower sampling rates

    2 Options (among others)
          Keep the full segmentation allowed by the design (~1500 ch)
           but with only 1 fADC per plane
          Reduce the segmentation by grouping fibers and equip each
           channel with shaper + fADC at 100 MHz (like for KL)


CHIPP June 2008              Jean-Sébastien Graulich                   Slide 15
           Recent Testbeam at CERN


                                                           CERN T9
                                                           beam line




         MICE-SW-EMR                              Plastic Scintillator
                                                  TRIGGER

                  1m rods




                       Si-detectors
                       TRACKING
CHIPP June 2008         Jean-Sébastien Graulich                 Slide 16
Participants:
Gianrossano Giannini, Pietro Chimenti, Erik Vallazza, Stefano Reia (M.T.),
Dario Iugovaz(M.T.), Mauro Bari(E.T.), Giulio Orzan(E.T.)
Trieste INFN and Trieste University- Physics Department
Michela Prest, Valerio Mascagna & students: Andrea, Daniela, Davide, Said
Como Univ. and INFN-MiB
Jean-Sebastien Graulich
    CHIPP June
Geneva Univ. 2008            Jean-Sébastien Graulich                Slide 17
                      Light yield study


  2.0 GeV CERN T9 beam
  (e-/-)




                               2 FIBERS             XY Silicon detectors
                               SINGLE FIBER         (resol. ~ 40m)
multianode PMT
(16 channels)                  GLUED
                               NOT GLUED

    CHIPP June 2008       Jean-Sébastien Graulich                  Slide 18
           Pulse height comparison




CHIPP June 2008   Jean-Sébastien Graulich   Slide 19
                  Efficiency in SW
            Electron Muon Ranger




CHIPP June 2008         Jean-Sébastien Graulich   Slide 20
Efficiency versus
beam particle
position
in scintillator bars
(1.9 cm height) in
all 4 vertical layers
superimposed
                         Wide and deep efficiency drop
                         between individual bars
                         Being analyzed more carefully..

       CHIPP June 2008   Jean-Sébastien Graulich     Slide 21
The first two layers are equipped with WLS fibers on both sides




     CHIPP June 2008        Jean-Sébastien Graulich               Slide 22
         Obninsk/CPTA SiPM (Russian flavor)




CHIPP June 2008     Jean-Sébastien Graulich   Slide 23
            IRST SiPM (Italian flavor)
         Energy spectrum (e+pi @ 2 GeV/c)               Easy calibration !




                                  After cut on the
                                  opposite scintillator side
                                  (readout with MA-PMt)




CHIPP June 2008            Jean-Sébastien Graulich                           Slide 24
           Further developments
       Considering triangular shape for better occupancy
       Minerva die set gives a triangle with a base of
        33mm and ht. of 17 mm nominal
       Allow grouping channels with marginal loss in
        resolution => savings in FEE




            Minerna test bench




CHIPP June 2008            Jean-Sébastien Graulich      Slide 25
Each layer 59 triangular bars:
30 triangular bars x 33 mm =990 mm
 + 29 matching triangular bars



                                Half triangular edge mechanical elements



                                     Each layer Active Scintillator region :
                                     990 mm x 990 mm x 17 mm

                                     Thickness with fiberglass cover~18 mm

                                        Total=18 mm x 40 layers = 720 mm
                      Conclusion
       MICE will demonstrate Ionization Cooling for muons by
        2010/2011
       It requires electron/muon separation for p between 140
        and 240 MeV/c at 10-3 level, with 99.8% efficiency
       A PID detector system has been designed in Geneva and
        is constructed by FNAL/Geneva/INFN collaboration
       It includes a fully active extruded scintillator detector
        (~1m3) with WLS fiber and (Si)PM readout
       We are developing cheap and efficient construction
        techniques and Front End Electronics
       Economical FEE able to do charge measurement at MICE
        rate (1MHz) is something to be…




CHIPP June 2008          Jean-Sébastien Graulich              Slide 27
Spare Slides




               28
CHIPP June 2008   Jean-Sébastien Graulich   Slide 29
CHIPP June 2008   Jean-Sébastien Graulich   Slide 30
How efficiency is defined:
 6) To overcome this problem an “or” condition has been added so that the
    efficiency is computed not only for the expected rod but taking into account
    also the previous and the next one. In other words, if the particle is expected
    to pass through rod number 3, the pulse heights of rod number 2, 3 and 4 are
    considered, if anyone of them is over-threshold, the particle in this event is
    considered as “detected” (that is a 1 is put into the profile histograms
    described                                                               before).
                                                           The dead zone width
                                                           is reduced.


                                                           Anyway a (smaller)
                                                           region seems to have
                                                           poorer efficiency...

                                                            maybe rods profile
                                                           is not rectangular!
                                            1m long rods of
                                            the same type
                                            of the EMR ones

                                Curved
                                edges



Dead zone up
to ~ mm




CHIPP June 2008   Jean-Sébastien Graulich
ENERGY SCAN




                                               At 15 GeV dead
                                               region seems to
                                               reduce at less than
                                               0.5 mm (as expected
                                               from rods shape)


   CHIPP June 2008   Jean-Sébastien Graulich

				
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