Silicon strip staves and petals for the ATLAS Upgrade tracker of the HL-LHC

Sergio Díez

doi:10.1016/j.nima.2012.06.004

Abstract

This paper describes the baseline integration structures for the silicon strip sensors to be used in the ATLAS detector for the Phase-II upgrade of the Large Hadron Collider (LHC) machine, the so-called High Luminosity LHC (HL-LHC). Highly modular structures have been developed for the integration of the silicon strips sensors, readout electronics, cooling, and support structures, called ‘staves’ for the barrel region and ‘petals’ for the end-caps of the ATLAS strips tracker. This work describes the status of the current prototypes, the building procedure, designed for mass production even at a prototyping stage, and their electrical performances.

Highlights

The Large Hadron Collider (LHC) experiment at CERN is extending the frontiers of particle physics with its unprecedented high energy and luminosity
Studies are underway to increase the capabilities of the LHC machine and its detectors, in order to further extend their sensitivity to new physics
Once the hybrids have been fabricated and tested, they are removed from the panels and glued directly onto the silicon strip sensors

Summary

Introduction

The LHC experiment at CERN is extending the frontiers of particle physics with its unprecedented high energy and luminosity. Phase-II upgrade, the so-called High Luminosity LHC (HL-LHC), is foreseen to increase the instantaneous luminosity of the machine by a factor of ten with respect to the current LHC, up to a integrated luminosity of 3000 f b−1 [1]. This luminosity increase poses numerous technological challenges to be faced by the LHC detectors: The new detectors must be faster, more highly segmented, cover more area, be more resistant to radiation, and require much greater power delivery to the front-end systems. They cannot introduce excess material which could undermine performance For these reasons, the current ATLAS tracker, the so-called Inner Detector (ID), will be replaced by an all-silicon upgraded tracker. Detailed studies for this approach are published elsewhere [5]

Stave module prototypes

Construction of stave module prototypes

Electrical tests and irradiations

Stavelet prototypes

Endcap integration structures: petals

Conclusions