chipp june 2008jean-sébastien graulich mice calorimeter r&d jean-sebastien graulich, univ....

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


MICE DesignMICE DesignFocus coils and LH2 Absorbers

Coupling coils and200 MHz RF Cavities

Solenoids, Matching coils and

Scintillating fiber Tracker


MICE PID DesignMICE PID Design

Time of Flight Stations

Cherenkov Counters

Electron/Muon Calorimeter

Some Beam Some Beam

Optics hereOptics here


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


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


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


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++


Pre-shower: KLOE Pre-shower: KLOE LikeLike


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


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


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


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


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)


CERN T9beam line

Si-detectorsTRACKING

Plastic ScintillatorTRIGGER

1m rods

MICE-SW-EMR

Recent Testbeam at Recent Testbeam at CERNCERN


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.


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


Pulse height Pulse height comparisoncomparison


Electron Muon Ranger

Efficiency in SWEfficiency in SW


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..


The first two layers are equipped with WLS fibers on both sides


Obninsk/CPTA SiPM (Russian Obninsk/CPTA SiPM (Russian flavor)flavor)


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)


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


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

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!


Curved edges

Dead zone up to ~ mm

1m long rods of the same type of the EMR ones


ENERGY SCAN

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

chipp june 2008jean-sébastien graulich mice calorimeter r&d jean-sebastien graulich, univ....

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