Shielding and electrical performance of silicon detector supermodules

Abstract

A large detector structure, called a supermodule, was developed for the CDF Run IIb silicon strip detector. The supermodule is a compact mechanical, thermal, and electrical unit, which is ideally suited for construction and assembly of large volume detector systems. Its dense packaging requires careful suppression of possible electromagnetic interference due to power, clock, control, and data bus activity. We study the coupling of the magnetic fields caused by a clock signal through an aluminum shield into the silicon strips. Analytical and numerical calculations of the resulting interference signal are presented, and its shape and size are estimated. The calculations are in fair agreement with electrical performance measurements taken with final design supermodules. Calculations and measurements show that the interference effect can be effectively suppressed by a thin aluminum shield.

Power distribution for SLHC trackers: Challenges and solutions

“…A miniaturized PCB with a commercial air-coil buck converter is being constructed to power silicon module read out by ABCD chips. This and custom devices will enable us to investigate the severity of EMR and if fringe-fields leaking out of the air coil could be picked up by the loop formed of silicon strips [15] although first estimates suggest that this is unlikely.…”

Serial powering of silicon strip detectors at SLHC

“…A highly integrated and densely packaged silicon strip stave was designed and prototyped for the Run IIb detector upgrade [5]. The electrical properties of this stave were studied in detail and are well documented [6,7]. We plan to use this stave as a challenging test bed for serial powering.…”

The CDF Run IIb Silicon Detector: Design, preproduction, and performance

“…A detailed explanation of the interference effects causing the structure is given in Ref. [57], together with simulations and comparison to measurement. The effect is present if the magnetic fields, associated with the front-end clock signal, are not sufficiently suppressed by the aluminum shield.…”