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Introduction BeamCal LHCal Summary
BeamCal and LHCal
S. Luki¢On behalf of the FCAL collaboration
Vin£a Institute of Nuclear Sciences, University of Belgrade
CLICdp meeting, 30-31 Aug. 2016, CERN
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 1/15
Introduction BeamCal LHCal Summary
Reminder � What are BeamCal and LHCal
Detector hermeticity (shower tagging at low angles)
Beam-parameter monitoring
Fast luminosity monitoring
LumiCal
BeamCal
Very forward region of the CLICdp detector
LumiCal
LHCal
BeamCal
Very forward region at ILD
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 2/15
Introduction BeamCal LHCal Summary
Reminder � What are BeamCal and LHCal
Detector hermeticity (shower tagging at low angles)
Beam-parameter monitoring
Fast luminosity monitoring
LumiCal
BeamCal
Very forward region of the CLICdp detector
LumiCal
LHCal
BeamCal
Very forward region at ILD
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 2/15
Introduction BeamCal LHCal Summary
Section 2
BeamCal
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 3/15
Introduction BeamCal LHCal Summary
Radiation hard sensor materials
Up to 1 MGy/yr absorbed in BeamCal
Irradiation tests at SLAC
12-15 GeV electron beam @ 1 nA
Sensor sandwiched between 6 and8 X0 thick absorbers
20 Mrad/hr dose in shower
2 X0 pre-radiator;
introduces a little
divergence in
shower
Not shown: 4 X0
“post radiator” and
8 X0 “backstop”
Sensor sample
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 4/15
Introduction BeamCal LHCal Summary
Radiation hard sensor materials
Charge collection in a p-type �oat-zone Si diode after 270 Mradabsorbed dose (= Dose at the �hottest� spot in BeamCal after 3years of running)Charge collection reduced by 20%
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 5/15
Introduction BeamCal LHCal Summary
Radiation hard sensor materials
Power draw map of BeamCal (collapsed) � based on an ILC simulationwith a 5 T magnetic �eld of the SiD detector (no DID/antiDID)
Power draw of BeamCal and per pixel in the hotspot vs. temperatureS. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 6/15
Introduction BeamCal LHCal Summary
Readout electronics
Development at Ponti�cia Universidad Catolica de Chile
Readout chip R&D within the MOSIS education program
0.5 µm process
Con�gurable front-end for particle physics
Testboard to be submitted for fabrication
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 7/15
Introduction BeamCal LHCal Summary
Contact bonding R&D
Spring loaded contacts (molded bumps)
Simple, robust and repeatable
assembly
Tight requirements on surfaces
→ uniform and constant contact
force required
Fanout for a BeamCal Ga-As sensor with molded bumps
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 8/15
Introduction BeamCal LHCal Summary
Contact bonding R&D
Commercially available interposers
Low pro�le (down to 0.5 mm)
High density
Can be manufactured to the user's geometry
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 9/15
Introduction BeamCal LHCal Summary
Simulation studies
Reconstruction algorithms
Shower reconstruction in presence of beambackground
Beam parameter monitoring
Backscattering etc.
DD4hep implementation of the BeamCal and the
surrounding beam instrumentation, [mrad]θ
5 10 15 20 25 30 35 40 45 50
ε
0
0.2
0.4
0.6
0.8
1
=500GeVeEclustering, pregen bgshower fit, pregen bgclustering, gausian bgshower fit, gausian bg
ε vs. θ for a 500 GeV shower at a3 GeV CLIC
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 10/15
Introduction BeamCal LHCal Summary
Alternative sensor orientation
Higher deposit by MIP travelling parallel to the sensors � betterdynamic ratio for the calibrationSapphire sensors � better radiation hardnessWorse spatial uniformity and energy resolution
Alternative sensor layout with sapphire sensorsS. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 11/15
Introduction BeamCal LHCal Summary
Section 3
LHCal
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 12/15
Introduction BeamCal LHCal Summary
Particle-type discrimination in LHCal
Discrimination of EM from hadronic showers by the 2D E vs.〈z〉 distribution.
M. Lazorenko, Taras Shevchenko National University of Kyiv
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 13/15
Introduction BeamCal LHCal Summary
Shower energy resolution in LHCal
Simulation study on the shower resolution in LHCal for thecase of W and Fe absorbers.
V. Lukianchuk, Y. Onischuk, Taras Shevchenko National University of Kyiv
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 14/15
Introduction BeamCal LHCal Summary
Summary
R&D on radiation hard sensor materials, bonding schemesand readout for BeamCal in progress.
Several activities slowed down by lack of funding.
LHCal (simulation) studies started only recently.
S. Luki¢, CLICdp meeting, 30-31 Aug. 2016, CERN BeamCal and LHCal 15/15