1 a first design of the pep-n calorimeter a first design of the pep-n calorimeter presented by p....
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A first design of the PEP-N Calorimeter A first design of the PEP-N Calorimeter Presented by P. Patteri
Laboratori Nazionali di Frascati INFN
for PEP-N Calorimeter Group
Brief presentation of KLOE calorimeterBrief presentation of KLOE calorimeter Schematics of PEP-N calorimeterSchematics of PEP-N calorimeter Simulations: reconstruction and TOFSimulations: reconstruction and TOF
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24 barrel modules60 cells (5 layers)
4.3m length
2 × 32 endcap modules
10/15/30 cells
2440 cells2440 cells 4880 channels4880 channels
Fiber choice: Kuraray SCSF-81 and Pol.Hi.Tech 0046
PM choice: Mesh Hamamatsu R5946
KLOE CALORIMETER OVERVIEW
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The KLOE EMC is a fine sampling lead/scintillating fibers calorimeter
Volume Ratio Fiber:Lead 50:50Energy sampling fraction 13 %<X0>= 1.6 cm <>=5.3 g/cm3
1.2 mm
Lead
1.35 mm1.0 mm
52.5 cm
15X0
430 cmPure “em” calorimeter … no compensation
High light yield and good energy resolution due to fibers’ choice
Excellent time resolution driven by fast time emission in the fibers and small light path dispersion along the fibers’ length
THE CALORIMETER STRUCTURE
N.B. the particles impinging on the calorimeter cross the fibers “almost” orthogonallyN.B. the particles impinging on the calorimeter cross the fibers “almost” orthogonally
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Title: fig11.ps Creator: XV Version 3.10a Rev: 12/29/94 - by John Bradley Preview: This EPS picture was not saved with a preview (TIFF or PICT) included in it Comment: This EPS picture will print to a postscript printer but not to other types of printers Light guides at one end of a barrel module
before photo-tubes installation
Light guides at one end of a barrel module before photo-tubes installation
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Title: (C:\\WINNT40\\Profiles\\Paolo\\Desktop\\12-2000\\CalNim\\Figs\\Exploded.eps) Creator: (CorelDRAW 8) Preview: This EPS picture was not saved with a preview (TIFF or PICT) included in it Comment: This EPS picture will print to a postscript printer but not to other types of printers Exploded view of the PM boxExploded view of the PM box
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Average energy scale:
40 MeV/MIP
Using the number of pe/MIP measured at CRS: light yield of
1000 pe/GEV/side @ calorimeter center
A factor 2 more light at the calorimeter boundaries
Energy resolution dominated by sampling fluctuactions
No cuts have been made on “holes” or specific detector regions
LINEARITY IN ENERGY RESPONSE AND ENERGY RESOLUTION
e+e- e+e-
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TIMING RESOLUTION
Behaviour of t
as a function of the energy is reported using all relevant ’s samplesComparing the difference of timing between two clusters at small and large angle we estimate that of the 147 ps of constant term:
50 ps mis-calibration
55 ps bunch spread
125 ps machine time spread
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Measured efficiency in Kloe calorimeterMeasured efficiency in Kloe calorimeter
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Summary of KLOE-type SciFi calorimeterSummary of KLOE-type SciFi calorimeter
Spatial resolution transverse ~1.5 cm
longitudinal 1.2/E cm/GeV
Energy resolution 0.06/E 1/GeV
Time resolution 54/E[GeV]+ 147 ps
Radiation length 1.5 cm
Energy sampling frac. 13 %
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Perspective view of the PEP-N calorimeterPerspective view of the PEP-N calorimeter
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Forward calorimeterForward calorimeter
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Montecarlo efficiency of 10 cm thick Montecarlo efficiency of 10 cm thick Kloe-type calorimeterKloe-type calorimeter
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Montecarlo energy resolution of 10 cm thick Montecarlo energy resolution of 10 cm thick Kloe-type calorimeterKloe-type calorimeter
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energy distributionenergy distributionFCAL, RCAL (top) BCAL, PCAL (bottom)FCAL, RCAL (top) BCAL, PCAL (bottom)
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K- K- time-of-flight difference time-of-flight difference
Delta TOF
0.00
1.00
2.00
3.00
4.00
200 300 400 500 600 700 800 900 1000 1100
Momentum [Mev/c]
De
lta
TO
F [
ns
]
kappa-pi TOF 60 cm (PCAL)+ 280 ps - 280 pskappa-pi TOF 125 cm (FCAL)+ 280 ps - 280 ps
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TOF distribution in FCAL, BCAL and PCALTOF distribution in FCAL, BCAL and PCALTitle:pepnt_12_his.epsCreator:HIGZ Version 1.26/04Preview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
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