Components Qualification for a Possible use in the Mu2e Calorimeter Waveform Digitizers

TL;DR

This paper discusses the qualification process for waveform digitizer components in the Mu2e calorimeter, focusing on radiation hardness and operation in a high magnetic field within harsh experimental conditions.

Contribution

It presents the initial qualification procedures and experimental results for components intended for use in the Mu2e calorimeter digitizer system.

Findings

Initial qualification tests completed for selected components.

Experimental results inform component suitability under radiation and magnetic field.

Procedures set the stage for final component selection after simulations.

Abstract

The Mu2e experiment at Fermilab searches for the charged flavor violating conversion of a muon into an electron in the Coulomb field of a nucleus. The detector consists of a straw tube tracker and a CSI crystal electromagnetic calorimeter, both housed in a superconducting solenoid. Both the front-end and the digital electronics, located inside the cryostat, will be operated in vacuum under a 1 T magnetic field, having to sustain the high flux of neutrons and ionizing particles coming from the muons stopping target. These harsh experimental conditions make the design of the calorimeter waveform digitizer quite challenging. All the selected commercial devices must be tested individually and qualified for radiation hardness and operation in high magnetic field. At the moment the expected particles flux and spectra at the digitizers location are not completely simulated and we are using initial rough estimates to select the components for the first prototype. We are gaining experience in the qualification procedures using the selected components but the choice will be frozen only when dose and neutron flux simulations will be completed. The experimental results of the first qualification campaign are presented.