Prototyping of petalets for the Phase-II Upgrade of the silicon strip tracking detector of the ATLAS Experiment

TL;DR

This paper reports on the development and testing of petalets, small prototype modules for the ATLAS Inner Tracker upgrade, demonstrating their mechanical and electrical performance to inform future large-scale detector construction.

Contribution

It introduces the design, assembly, and evaluation of petalets, a new modular prototype structure for the ATLAS silicon strip detector upgrade.

Findings

Successful assembly and testing of petalets with promising mechanical stability.

Electrical measurements indicate reliable signal routing and sensor performance.

Outlook provided for scaling up prototypes for full detector modules.

Abstract

In the high luminosity era of the Large Hadron Collider, the HL-LHC, the instantaneous luminosity is expected to reach unprecedented values, resulting in about 200 proton-proton interactions in a typical bunch crossing. To cope with the resultant increase in occupancy, bandwidth and radiation damage, the ATLAS Inner Detector will be replaced by an all-silicon system, the Inner Tracker (ITk). The ITk consists of a silicon pixel and a strip detector and exploits the concept of modularity. Prototyping and testing of various strip detector components has been carried out. This paper presents the developments and results obtained with reduced-size structures equivalent to those foreseen to be used in the forward region of the silicon strip detector. Referred to as petalets, these structures are built around a composite sandwich with embedded cooling pipes and electrical tapes for routing the signals and power. Detector modules built using electronic flex boards and silicon strip sensors are glued on both the front and back side surfaces of the carbon structure. Details are given on the assembly, testing and evaluation of several petalets. Measurement results of both mechanical and electrical quantities are shown. Moreover, an outlook is given for improved prototyping plans for large structures.