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