Speaker
Description
Highly compact and granular electromagnetic calorimeters are required for precision luminosity measurements at future e⁺e⁻ colliders and for the determination of positron multiplicity and energy spectra in the LUXE experiment.
A silicon–tungsten sampling calorimeter is being developed within the FCAL and DRD Calo collaborations. Its construction poses a significant technological challenge, since the gaps between the tungsten absorber plates must be kept as small as possible in order to preserve the intrinsic compactness of tungsten. The active layers therefore have to integrate the silicon pad sensors, signal routing, high-voltage distribution and mechanical support within a very limited thickness.
The design, assembly and integration procedures developed for these modules are presented, together with experience from the construction of a multi-layer prototype. The system has been operated in electron beams at DESY, providing a validation of the mechanical integration, sensor connectivity and full readout chain of this highly compact calorimeter concept.
Preliminary beam-test results on energy, position, and angular resolution, as well as on the Molière radius and longitudinal shower development, are presented and compared with simulation expectations. The current status of the prototype development and the prospects for further performance studies will also be discussed.