Speaker
Description
Performant electromagnetic calorimeters suited for a Particle Flow approach rely on their granularity and compactness to unravel the contributions of nearby showers. For practical reasons, their readout electronics must be close to the sensors, hence present a very low power dissipation, in a scalable geometry allowing for long (~1.5–1.8 m) detector cassettes serviced from a single end. To do so, near linear colliders, detector electronics can be pulsed. The aforementionned requirements apply to the very front-end ASICs but equally to the supporting PCB’s. The technological prototype of the CALICE SiW ECAL is testing solutions for an ILC-like environnement, based on 18×18 cm² front-end boards, holding 16 SKIROC2 ASICs and 4 matrices of silicon diodes. Five versions of these boards, using either packaged or naked chips, have been integrated, and recently tested in beam, in a stack of 15 single-board layers, and in long layer of 8 boards. Lessons learned from these tests will be discussed in this contribution, as well as the new, improved, design, including on-board power regulations.
