Forward Calorimeter Baseplane and FC1 Layer Sum Board D. Tompkins 30 June 2015.
Design of the TESLA very Forward Calorimeter
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Design of the TESLA very Forward Calorimeter K. Afanasiev 2 , V. Drugakov 2 , E. Kouznetsova 1 , W. Lohmann 1 , A. Stahl 1 1 DESY - Zeuthen 2 University of Minsk DPG, Aachen, 10.03 – 13.03. 200
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Design of the TESLA very Forward Calorimeter. K. Afanasiev 2 , V. Drugakov 2 , E. Kouznetsova 1 , W. Lohmann 1 , A. Stahl 1 1 DESY - Zeuthen 2 University of Minsk. DPG, Aachen, 10.03 – 13.03. 2003. Location and Requirements. - PowerPoint PPT Presentation
Transcript of Design of the TESLA very Forward Calorimeter
Design of the TESLA
very Forward Calorimeter
K. Afanasiev2, V. Drugakov2,
E. Kouznetsova1, W. Lohmann1, A. Stahl1
1 DESY - Zeuthen2 University of Minsk
DPG, Aachen, 10.03 – 13.03. 2003
Location and Requirements
• Detection and measurement of electrons and photons at small angles
• Fast beam diagnostic
• Shielding of the inner part of the detector
Beamstrahlung
• TESLA : Beam size 553 nm x 5 nm
↓ (pinch effect)
• ~6 x 1010 photons / BX
↓ (→e+e-, e-→e+e-e- , e+e-→e+e- e+e-)
• ~6 x 104 e+e- pairs / BX
Background Simulation
GUINEAPIG + BRAHMS( for √s = 500 GeV ) :
Per bunch crossing :
• ~15000 e± hit the LCAL• ~20 TeV of deposited
energy
Expected dose :
• for “bad” regions :up to 10
MGy/year(R,)-distribution of the deposited energy in
LCAL :
De
po
sit
ed
En
erg
y,
Ge
V
is required !
One of possible options for calorimeter technology
Diamond-tungsten sandwich
www.desy.de/~ghodbane
CVD DIAMONDradiation hardness
No decrease in the charge collection distance up to 10 MGy
Sandwich LCALgeometry
Z - Segmentation :
Tungsten 3.5 mm
Layer == 1 X0
Diamond 0.5 mm
(R,) - Segmentation :
Tungsten absorber +
Diamond sensor
=> Cell size = 0.5 cm
RM ~ 1 cm
Signal and background
250 GeV e- + BG :
Signalreconstruction
sensor PA/discr ADC
reconstructionAlgorithm :
• 10 previous BG -> average BG + RMS
• “Suspected” cells : ECELL > 3 BG
reasonable z-location
• Requirement of a longitudinal chain of such cells
Sandwich LCALrecognition
Efficiency vs radius :
Sandwich LCALrecognition
Fake rate :
(BG of high energy + BG fluctuations)
( 50
0 b
un
chcr
oss
ing
s )
Sandwich LCALrecognition
Energy resolution vs radius :
Sandwich LCALrecognition
Energy resolution vs radius :
Sandwich LCALrecognition
Polar angle resolution vs radius :
Sandwich LCALRecognition
Calibration :
Averaged energy resolution :
Sandwich LCALRecognition
Averaged angular resolution :
CONCLUSIONS
sandwich diamond-tungsten calorimeter seems to be a promising technology
high energetic e±, can be detected with reasonable efficiency even near the beam pipe, on top of the extremely high background
“hardware part” of the study has been started
