Speaker
Description
Highly compact and granular electromagnetic calorimeters are required for precision measurements in luminometers at e$^+$e$^-$ colliders and for the determination of positron multiplicity and energy spectra in the laser–electron scattering experiment LUXE, which probes strong-field QED. In luminometer applications, where Bhabha scattering serves as the reference process, a compact calorimeter with a small Molière radius enables a precise definition of the fiducial volume, reduces the required space, and improves the separation of high-energy electromagnetic showers from low-energy background. In laser–electron scattering, the wide dynamic range of secondary particles makes a compact calorimeter suitable for both counting and energy measurement. A sandwich-type calorimeter has been designed and partially constructed, consisting of tungsten absorber plates interleaved with thin silicon sensor planes separated by 1.2 mm gaps. Each sensor plane uses a 90x90 mm² silicon pad sensor with a 16×16 matrix, flexible Kapton circuits, and a carbon-fiber support, with a total thickness of less than 1 mm. The readout employs FLAME ASICs integrating analogue electronics and 10-bit ADCs. A prototype with up to 11 layers was tested with 1–6 GeV electron beams at DESY-II. Preliminary results on energy, position, and angular resolution, the Molière radius, and longitudinal shower development are presented.
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