Beam test performance of the highly granular SiW-ECAL technological prototype for the ILC

Abstract

The technological prototype of the CALICE highly granular silicon-tungsten electromagnetic calorimeter (SiW-ECAL) was tested in a beam at DESY in 2017. The setup comprised seven layers of silicon sensors. Each layer comprised four sensors, with each sensor containing an array of 256 5.5 × 5.5 mm 2 silicon PIN diodes. The four sensors covered a total area of 18 × 18 cm 2 , and comprised a total of 1024 channels. The readout was split into a trigger line and a charge signal line. Key performance results for signal over noise for the two output lines are presented, together with a study of the uniformity of the detector response. Measurements of the response to electrons for the tungsten loaded version of the detector are also presented.

ILD silicon tungsten electromagnetic calorimeter first full scale electronic prototype

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Implementation of large imaging calorimeters

“…This allows for triggering at a 1/3 mip MPV with nearly 100% efficiency while keeping noise cut at 4 σ. A recent improvement in PCB design increased the S/N in the readout branch from 16-17 (with 320 μm wafers on PCB version v11) to 20.3 ± 1.5, while the number of masked channels went from 8 % to 0.3% [6]. This ratio rises to 30-40 when using 650 μm wafers on the latest PCB version (v13).…”

“…A technological prototype of the SDHCAL [12] was built in 2011, including single and multi-gap thin GRPC 6 , segmented in cells of 1×1 cm² and separated by 2.6 cm stainless-steel absorbers. Ωmega's HARDROC2 ASICs perform the readout.…”

Conceptual design report for the LUXE experiment

“…The observed shift in the energy deposited in the ECAL due to background can be corrected for by direct background measurements with the laser off, with minimal effect on the resolution for most of the ECAL fiducial volume. In order to perform energy measurements in the phase-0 early runs, an already available high granularity electromagnetic calorimeter from the CALICE collaboration [225] together with a partly instrumented LUXE ECAL may be used. This way both measurements for physics at low laser power as well as background will be performed.…”