CHIPP June 2008Jean-Sébastien Graulich MICE Calorimeter R&D Jean-Sebastien Graulich, Univ. Genève...
-
date post
15-Jan-2016 -
Category
Documents
-
view
220 -
download
0
Transcript of CHIPP June 2008Jean-Sébastien Graulich MICE Calorimeter R&D Jean-Sebastien Graulich, Univ. Genève...
CHIPP June 2008 Jean-Sébastien Graulich
MICE Calorimeter R&DJean-Sebastien Graulich, Univ. Genève
o Introduction to MICEo The MICE Calorimetero Sensor and Electronicso Test beam resultso Future developmentso Conclusion
CHIPP Workshop on Detector R&D
11-12 June - University of Geneva
CHIPP June 2008 Jean-Sébastien Graulich Slide 2
IntroductionIntroduction
MICE is Accelerator MICE is Accelerator Physics more than HEP Physics more than HEP
MICE is part of the MICE is part of the R&D program towards R&D program towards the the neutrino factoryneutrino factory
Aim at Demonstrating Aim at Demonstrating Ionization CoolingIonization Cooling of a of a muon beammuon beam
Validate new Validate new simulation toolssimulation tools for for future designfuture design
MICE should deliver MICE should deliver results before 2011results before 2011
CHIPP June 2008 Jean-Sébastien Graulich Slide 3
MICE DesignMICE DesignFocus coils and LH2 Absorbers
Coupling coils and200 MHz RF Cavities
Solenoids, Matching coils and
Scintillating fiber Tracker
CHIPP June 2008 Jean-Sébastien Graulich Slide 4
MICE PID DesignMICE PID Design
Time of Flight Stations
Cherenkov Counters
Electron/Muon Calorimeter
Some Beam Some Beam
Optics hereOptics here
CHIPP June 2008 Jean-Sébastien Graulich Slide 5
MICE Status @ RAL, UKMICE Status @ RAL, UKPion production and capture in ISIS vault
MICE hall at RAL
Pion decay solenoid (PSI)
First beam Protons/Pions
CHIPP June 2008 Jean-Sébastien Graulich Slide 6
MICE Electron-Muon MICE Electron-Muon CalorimeterCalorimeter
Aim at separating muons from decay electronsAim at separating muons from decay electrons Necessary to reduce systematic errors on emittance Necessary to reduce systematic errors on emittance
measurementmeasurement
Muons and electrons have
≠ Single Particle Emittance
CHIPP June 2008 Jean-Sébastien Graulich Slide 7
Electron Muon Electron Muon SeparationSeparation
Muons and electrons have
Overlapping Pz in the Tracker
(where it is measured)
Time of flight is not sufficient to separate them
“Nobody said it was going to be easy, and nobody was right.“President George Bush, quoted by Rikard Sandstroem
“Nobody said it was going to be easy, and nobody was right.“President George Bush, quoted by Rikard Sandstroem
CHIPP June 2008 Jean-Sébastien Graulich Slide 8
EMCal Conceptual EMCal Conceptual Design Design
Design proposed by GenevaDesign proposed by Geneva Reduce the need for charge measurement (ADC are expensive,
aren’t they…) Backboned by detailed simulation
Made of two parts:Made of two parts: High Z active pre-shower layer: Forces electrons to shower Thick stack of plastic scintillator:
Stop the muonsMeasure range and track topology
ee++
µµ++
CHIPP June 2008 Jean-Sébastien Graulich Slide 9
Pre-shower: KLOE Pre-shower: KLOE LikeLike
CHIPP June 2008 Jean-Sébastien Graulich Slide 10
V1724 - Seq
norm 264.6 2236 0.839 6.177 0.321 1.666t 0.33 27.48offset 7.1 8194
0 20 40 60 80 100
8200
8400
8600
8800
9000
9200
9400
KL ConstructionKL Construction Produced by INFN Roma IIIProduced by INFN Roma III ““In the mail” to RALIn the mail” to RAL Coupled to individual PMTs Coupled to individual PMTs Readout by 100 MHzReadout by 100 MHz
waveform digitizer (after shaper)waveform digitizer (after shaper) This gives both charge and
time (< 1 ns) information
KL + shieldingKL
Naked
Signal Shape well understood
CHIPP June 2008 Jean-Sébastien Graulich Slide 11
Scintillator Wall Scintillator Wall (SW)(SW)
~1 m~1 m33 bloc of scintillator bloc of scintillator Longitudinal segmentationLongitudinal segmentation
needed to measure the rangeneeded to measure the range Increasing thickness optimize
the relative precision on the range w.r.t the number of readout channels
Transverse segmentationTransverse segmentation needed to reduce the needed to reduce the occupancy per channeloccupancy per channel
Main issue:Main issue:
Muons stopping in the EMCal Muons stopping in the EMCal produce background when produce background when they decaythey decay
At equilibrium: ~1 muon in the detector at all time
CHIPP June 2008 Jean-Sébastien Graulich Slide 12
SW R&DSW R&D
Use extruded scintillators + WLS fibers Use extruded scintillators + WLS fibers A la Minera First prototype built in INFN Trieste using
rectangular shape scintillator received from Fermilab
19 mm
15 mm
Full scale single Layer Prototype
1/5 scale 2x4 Layers Prototype
Simple mechanical Simple mechanical assemblyassembly
Easily stackable
Assembled, equipped and Assembled, equipped and tested in Triestetested in Trieste
Has been tested in beam at Has been tested in beam at CERN last weekCERN last week
CHIPP June 2008 Jean-Sébastien Graulich Slide 14
SW Light Sensor choiceSW Light Sensor choice
Multi-Anode PMTsMulti-Anode PMTs Like in Minera itself 64 or 256 channels per PMT Last dynode can be used to measure the total energy
deposit per plane. SiPM (or Hamamatsu MPPC)SiPM (or Hamamatsu MPPC)
Like in T2K (P0D for example) Give some d.o.f. for the mechanical assembly
Two OptionsTwo Options
CHIPP June 2008 Jean-Sébastien Graulich Slide 15
SW Front-End SW Front-End Electronics Electronics
TDC with ~1.5 ns resolution is cheapTDC 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 expensiveADC 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)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 16
CERN T9beam line
Si-detectorsTRACKING
Plastic ScintillatorTRIGGER
1m rods
MICE-SW-EMR
Recent Testbeam at Recent Testbeam at CERNCERN
CHIPP June 2008 Jean-Sébastien Graulich Slide 17
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 DepartmentMichela Prest, Valerio Mascagna & students: Andrea, Daniela, Davide, SaidComo Univ. and INFN-MiBJean-Sebastien GraulichGeneva Univ.
CHIPP June 2008 Jean-Sébastien Graulich Slide 18
GLUEDNOT GLUED
multianode PMT(16 channels)
XY Silicon detectors (resol. ~ 40m)
2.0 GeV CERN T9 beam(e-/-)
2 FIBERSSINGLE FIBER
Light yield studyLight yield study
CHIPP June 2008 Jean-Sébastien Graulich Slide 19
Pulse height Pulse height comparisoncomparison
CHIPP June 2008 Jean-Sébastien Graulich Slide 20
Electron Muon Ranger
Efficiency in SWEfficiency in SW
CHIPP June 2008 Jean-Sébastien Graulich Slide 21
Efficiency versus beam particle positionin scintillator bars(1.9 cm height) in all 4 vertical layerssuperimposed
Wide and deep efficiency drop between individual bars
Being analyzed more carefully..
CHIPP June 2008 Jean-Sébastien Graulich Slide 22
The first two layers are equipped with WLS fibers on both sides
CHIPP June 2008 Jean-Sébastien Graulich Slide 23
Obninsk/CPTA SiPM (Russian Obninsk/CPTA SiPM (Russian flavor)flavor)
CHIPP June 2008 Jean-Sébastien Graulich Slide 24
IRST SiPM (Italian IRST SiPM (Italian flavor)flavor)
After cut on the opposite scintillator side (readout with MA-PMt)
Easy calibration !
Energy spectrum (e+pi @ 2 GeV/c)
CHIPP June 2008 Jean-Sébastien Graulich Slide 25
Further Further developmentsdevelopments
Considering triangular shape for better Considering triangular shape for better occupancyoccupancy
Minerva die set gives a triangle with a base Minerva die set gives a triangle with a base of 33mm and ht. of 17 mm nominalof 33mm and ht. of 17 mm nominal
Allow grouping channels with marginal loss Allow grouping channels with marginal loss in resolution => savings in FEEin resolution => savings in FEE
Minera test bench
Each layer 59 triangular bars: 30 triangular bars x 33 mm =990 mm + 29 matching triangular bars
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
Half triangular edge mechanical elements
CHIPP June 2008 Jean-Sébastien Graulich Slide 27
ConclusionConclusion
MICE will demonstrate Ionization Cooling for MICE will demonstrate Ionization Cooling for muons by 2010/2011 muons by 2010/2011
It requires electron/muon separation for It requires electron/muon separation for pp between 140 and 240 MeV/c at 10between 140 and 240 MeV/c at 10-3-3 level, with level, with 99.8% efficiency 99.8% efficiency
A PID detector system has been designed in A PID detector system has been designed in Geneva and is constructed by FNAL/Geneva/INFN Geneva and is constructed by FNAL/Geneva/INFN collaborationcollaboration
It includes a fully active extruded scintillator It includes a fully active extruded scintillator detector (~1mdetector (~1m33) with WLS fiber and (Si)PM ) with WLS fiber and (Si)PM readoutreadout
We are developing cheap and efficient We are developing cheap and efficient construction techniques and Front End construction techniques and Front End ElectronicsElectronics
Economical FEE able to do charge measurement Economical FEE able to do charge measurement at MICE rate (1MHz) is something to be…at MICE rate (1MHz) is something to be…
28
Spare SlidesSpare Slides
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!
CHIPP June 2008 Jean-Sébastien Graulich
Curved edges
Dead zone up to ~ mm
1m long rods of the same type of the EMR ones
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)