The Construction Technique of KLOE EmCal · The AMS option for a “KLOE_like” Electromagnetic...
Transcript of The Construction Technique of KLOE EmCal · The AMS option for a “KLOE_like” Electromagnetic...
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MICE EmCal
Overview of Design and Construction Technique
Hardware and Software activities
Ludovico TortoraINFN - Roma III
CERN - 29 March 2003
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NIM A 482 (2002) 363-385
Density ≈ 5 g/cm3
Sampling fraction for mip ≈ 15%Radiation length ≈ 1.5 cm
The construction technique consists in embedding 1 mm diameterpolystyrene based blue scintillating fibers between thin grooved lead plates,obtained by plastic deformation of 0.5 mm thick lead foil.
Fibers are glued to the lead plates and run parallel to each other with apitch of 1.35 mm and are mostly orthogonal to the entering particles.
Fine Grained Calorimeter Option for Electron Identifier
The Construction Technique of KLOE EmCal
fiber
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T.O.F. IIIT.O.F. IIIPrecise timingPrecise timing
Electron IDElectron IDEliminate muons that decEliminate muons that dec
Tracking devices: Tracking devices: He filled TPC-GEM (similar to TSLA R&D)He filled TPC-GEM (similar to TSLA R&D)and/or and/or scisci-fi-fiMeasurement of momentum, angles and positionMeasurement of momentum, angles and position
T.O.F. I & IIT.O.F. I & IIPion Pion /muon ID/muon IDprecise timingprecise timing
10% cooling of 200 MeV muons requires ~ 20 MV of RF single particle measurements => measurement precision can be as good as ∆ ( ε out/ε in ) = 10-3
201 MHz RF cavities
Liquid H2 absorbersor LiH ?
SC Solenoids;Spectrometer, focus pair, compensation coil
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muons defocused by fringe field
and
EmCal
…omissis … we decided in Chicago in February 02 that : the useful spectrometer field region should be 100 cm long and 30 cm diameter the inner bore should be 40 cm
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KLOE Construction Techniques
• Pb sheet swaging machine (large & small)• Precision growing of layers• Scintillating fibers• Optical epoxy• Pressure application• Accurate machining of module• Winston cones & light guides
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Small Swaging Machine @Regina
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Zisis PapandreouDept. of Physics
University of Regina
Zisis PapandreouDept. of Physics
University of Regina
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Big Swaging Machine @ LNF
The grooving rollers result by theassembling of 13 disk-like pieces,50 mm thick and 400 mm in diametermade of hardened steel and ground toshape by a sintered diamond tool;the rollers are fixed by means of ballbearings on a very rigid frame and arealigned and checked with a set ofmicrometers.
The achievable thickness uniformity isaround few tens of µm and the groovescan deviate from a straight line by lessthan 0.1 mm per foil length.
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The AMS option for a “KLOE_like” Electromagnetic Calorimeter
• www.pi.infn.it• The Electromagnetic Calorimeter is built of layers of 1.5 mm lead and 1 mm scint. fibers.• The granularity for readout is 2x2 cm2 (about 1 radiation lenght x 1 rad.l.).• In this way is possible to study the longitudinal and the lateral shape of the e. m. showers.• The cell length is 65 cm and the readout of this system is only on one side.• To have the information about the coordinate along the fiber, each superlayer has fibers
oriented perpendicularly to the next.
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Scintillating Fibers
• Kuraray (SCSF-81 type) 1 mm fibers• PolHiTech (0046 or 0044 type) 1 mm fibers• Both emit in blue-green region• Have 3-4 m attenuation length and 2.5 ns decay
constants• Kuraray are sensitive to UV light
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Optical Fiber Tests with 100MeV pions
• Properties:– Light collection efficiency
(cladding)– Scintillation light production
(doping)– Light attenuation
coefficient– Timing resolution
• Fibers Types (single-,double-clad)– Kuraray SCSF-81– Pol.Hi.Tech. 0046– Bicron (too expensive) M11 Experimental Area at TRIUMF
August 2001
Zisis PapandreouDept. of Physics
University of Regina
Zisis PapandreouDept. of Physics
University of Regina
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Spectrum and Attenuation Length
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Optical Epoxy
• UHU industrial epoxy to glue to Al plate• Bicron-600 optical glue
– 28:100 hardener to epoxy– Curing time 1.5-2.5 hrs– Application: Glue-fibers-glue; teflon clamps– Requires proper training, suites, masks, gloves,
ventillated and dust-free room…• Pressure application (pistons or vacuum)• 150 µm Al tape; care to avoid delamination
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Pisa Pistons – Front and Side Views
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Prototype Module Construction
96 x 13 x 10 cm3
70 kg
B. Klein, J. Kushniryk,T.Summers, G. WilliamsLead Sheet Swaging
Matrix gluing & pressing
Inspection and cleaning
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Prototype Pb/SciFi Modules
Build in May 2002with help from
KLOE Folks
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KLOE Winston cone light guide
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[cell dimension : 3,5×3,5×200 cm3]
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How visible energy looks like
LADON Test @ LNF - 1993 Test @ PSI - 1994
electronsphotons
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The KLOE experienceshows that the visible energy isa linear function of the kineticenergy of the electrons in therange 20 ÷ 300 MeV.
Defining 1 MIP as thevisible energy deposited by aminimum ionizing particle in aread out element, the slope is≈ 37 MIP/GeV
Linearity
4%
1 %
Electrons 00 ≤ θ ≤ 400
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MIP and Muons in KLOE
Energy response for muons
Pµ (MeV/c) 150 200 240 280
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Energy response for muons and pions[cell dimension : 3,5×3,5×200 cm3]
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P= 200 MeV/c P = 250 MeV/c
∑∑=
i i
i ii
EEX
X distribution for 3.5 cm granularity
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NIM A 354 (1995) 352-363
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Electrons and Muons impacting the Calorimeter
by P. Janot
The momentum distribution (upper plot) and the directionality distribution(lower plot) of the electrons (histogram) and muons (shaded histogram).
The angle θ is the angle between the particle momentum and the z axis
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Electrons and Muons in MICE
KLOE-like Electron Identifier is characterized by :
- Radiation length ≈ 1.5 cm - Density ≈ 5 g/cm3
- Moliere radius ≈ 3 cm
From P. Janot simulation :
Muons (150 ÷ 350) MeV/c quite collimated (0 ÷ 0.2 ) rad Electrons ( 0 ÷ 300 ) MeV broad angular spread ( 0 ÷ 1.2 ) rad
With a EmCal depth 12÷15 cm (8÷10 X0) :
Muons (mostly) punching through for Pµ > 200 MeV/c ( tagged by a “ aligned sequence of MIP signals ” )
Enough containment for electron showers (300 MeV electrons have the maximun of shower ≈ 3.5 cm after conversion point and are tagged by cluster of cells)
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eIt’s possible to distinguish electronsfrom muons by means of :
⇒ path reconstruction based
on the energy released inside
the calorimeter’s elements
⇒ combination of cluster length, total energy, energy per plane …
Pattern of visible energy
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KLOE EmCal : NIM A 482 (2002) 363-385[cell dimension : 4,4×4,4×400 cm3]
15.000 Km of fibres (Kurarary & Pol. Hi. Tech) Average attenuation length ≈ 400 cm
Number of PhotoElectrons NPE = (AMIP × GADC) / GPM - Cosmic Ray ⇒ 35 PE/MIP - exp. energy scale ⇒ 40 MeV /MIP (obtained from showering particles of known energy like Bhabha at φ peak…)
Light yield ≈ 1 PE/MeV deposit at 200 cm far from PM
KLOE is operating with hardware electronics threshold ≈ 4mV corresponding to ≈ 3 MeV energy deposit at calorimeter center
As Electron Identifier for MICE ( length ≈ 60 cm ) we estimate to collect 70÷90 photoelectrons per MIP
hardware threshold ≤ 2 MeV
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Energy and Timing Resolutions
• In KLOE the EmCal is made of 5000 elements, most of them 4 meterlong and 4.3x4.3 cm2 of section, we find :- energy resolution
- timing resolution• In MICE these features have to be taken into account as reference for
possible contributions to :⇒ the system of time of flight⇒ the trigger⇒ impact point reconstruction (≈ 2 cm)
• As Electron Identifier in a MICEwe expect (even) better resolutions(because we collect more photoelectrons per MIP)
)(%7.5 GeVE
)(54 GeVEpsNIM A 482 (2002) 363-385
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Conclusions
•A possible design for the MICE Electron Identifier is a calorimeter (60x60 cm2 , 12÷15 cm thick) made of lead-scintillating fibers composite built as described above.
•A first evaluation suggests a read out granularity of 3.75x3.75 cm2
- to have a very high efficiency (≥ 99%) in electron tagging over all the energy range- a µ misidentification factor ≈ 10-3
•The proposed segmentation requires, in case of double side read out, to manage 128 electronics channels.
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STEP I: we get the muon beam
In this first phase we define the beam tunings, composition,settings for both mu+ and mu- as a function of momentum.
needed:beam (!)
TOF,trigger
some DAQtwo SCI FI arrays or beam chambers
PID
10 m
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EmCal Module and PMs Readout
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… resuming KLOE EmCal prototype @ Roma III ….
cut-out of KLOE EmCalPrototype 0 (LNF twin)
≈ 200 lead/scintillating fiberslayers corresponding to ≈ 15 X0
12 cells 44 × 44 mm2 each
light collected by a gluedWinston cone guide
only one side readout byHamamatsu R1398
Schematic view of the 14-cells
KLOE Calorimeter prototype 0
230 mm ≈ 15 X0
132
mm
≈ 8
X0
470 m
m
44 × 44 mm2
LNFbeam
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Low energy electrons
… some background ….
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Energy range
≈ 75 % ≈ 16 %
≈ 5%≈ 2%
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Longitudinal and Transverse Shower Profile
ROWS1 2 3 4
COLUMNS
2
ETOT (MIPs)
BEAM
Shower transverse profile (Calorimeter 1)
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e+e- → Φ→ KS KL with KS→ π0π0 and KL→ πeνγ
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.. some K± KLOE events...
e+e- → Φ → K+ K-
K- → π-π0 , K+ → µ+ν
e+e- → Φ → K+ K-
K+ → µ ν , K- → π0 e ν
+
-
K-
+
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Muons from charged Kaons decay in KLOE
(Alessandra Tonazzo)
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Muons from charged Kaons decay in KLOE
(Alessandra Tonazzo)
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… KLOE published data on KS semileptonic decays ….
π−
e+
ν
ΚL
e+e- → Φ → KL KS
KL crash , KS → π e ν
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MX (e+e−→x+x-γ)
π+π−γ
π+π−π0
e+e−γ
before likelihood
after likelihood
µ+µ−γ
…. from KLOE analysis of e+e-→π+π-γ events ….
(selection by ToF + EmCal likelihood) backgrounds : e+e- → µ+µ- γ , e+e- → e+e-γ
(Anna Ferrari)
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Sample of Electrons and Muons
(Anna Ferrari)
electrons
muons
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Energy deposition per layer
Electrons Muons
Eplan (1) Eplan (2)
Eplan (3) Eplan (4)
( Anna Ferrari )
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Barycentre of the visible energy
Electrons
Muons
∑∑=
i i
i ii
EEX
X
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Electron and Muon identification
XCUT = 8.5 cm
% IN OUT
µ 99.87 0.13e 0.85 99.15
electrons
muons
( Anna Ferrari )
∑∑=
i i
i ii
EEX
X
X
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Electron and Muon identification
XCUT = 8.0 cm
% IN OUT
µ 100.00 0.00e 1.4 98.6
electrons
muons
( Anna Ferrari )
∑∑=
i i
i ii
EEX
X
X
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EmCal : homogeneity of response and µ/e identification
The EmCal structure is intrinsically homogenous; so his response doesn’tdepend on kinematic parameters of impinging particles (except for thresholdeffect on the energy deposition).High efficiency in detection is guaranteed if enough active material is fired,that is the EmCal has adequate transversal dimensions which allow fullsampling, even for strongly divergent particles.As far µ/e identification concerns, the ”KLOE-like” EmCal shows a tagefficiency greater than 99%. To reach 1 0/00 of misidentification, the simplevisible energy measurement is not enough; some pattern recognition - alreadyexperimented in KLOE - has to be implemented to distinguish electrons fromstopping muons. Therefore we need adequate readout granularity.“ the tail of the high energy muon spectrum could generate some light in theCerenkov and be counted as an electron” ; (apparently) no problem for EmCalthanks to the peculiar and very clean pattern shape of a minimum ionizingparticle.
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Info on MICE EmCal
Construction schedule : 1 year for a detector 60x60x15 cm3
but :pending technical decision about final layout and dimensions, major involvement of LNF infrastructures and external firms have to be consideredSpending profile :ready to place 90% of ordersneeded to do asap (procurements will take lot time) but pending financial approval
Work going on and planes
- recovery of equipments & tools
- “prototype” test @BTF
- look at KLOE data analysis for MICE goals(reproducibility of simulations)
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e/µ simulations in spaghetti
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e/µ simulations in tiles
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…. downstream Cerenkov…. … KLOE calorimeter ……
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