A double-sided silicon micro-strip Super-Module for the ATLAS Inner Detector upgrade in the High-Luminosity LHC

Abstract

The ATLAS experiment is a general purpose detector aiming to fully exploit the discovery potential of the Large Hadron Collider (LHC) at CERN. It is foreseen that after several years of successful data-taking, the LHC physics programme will be extended in the so-called High-Luminosity LHC, where the instantaneous luminosity will be increased up to 5 × 10 34 cm −2 s −1 . For ATLAS, an upgrade scenario will imply the complete replacement of its internal tracker, as the existing detector will not provide the required performance due to the cumulated radiation damage and the increase in the detector occupancy. The current baseline layout for the new ATLAS tracker is an all-silicon-based detector, with pixel sensors in the inner layers and silicon micro-strip detectors at intermediate and outer radii.The super-module is an integration concept proposed for the strip region of the future ATLAS tracker, where double-sided stereo silicon micro-strip modules are assembled into a low-mass local support structure. An electrical super-module prototype for eight double-sided strip modules has been constructed. The aim is to exercise the multi-module readout chain and to investigate the noise performance of such a system. In this paper, the main components of the current supermodule prototype are described and its electrical performance is presented in detail.

Mechanical studies towards a silicon micro-strip super module for the ATLAS inner detector upgrade at the high luminosity LHC

“…Details of the DSM performance, as well as results from an 8-module electrical SM prototype have been previously presented [5,6]. This paper describes mechanical design and prototype studies of the SM and its evolution towards a practicable solution for the ATLAS ITK.…”

“…This paper describes mechanical design and prototype studies of the SM and its evolution towards a practicable solution for the ATLAS ITK. Together with [6], it summarises the successful completion of a first stage feasibility investigation of the SM concept for the ITK.…”

“…Prototype studies are so far made CFRP layups using T300 fibres. 6 It is expected that significant design optimisation can be achieved following a full comparison of fabricated prototypes with finite element analysis (FEA) models (see section 5).…”

“…This section presents a short overview of the electronic services and their implication for the LS mechanics. Figure 13 shows a 3D CAD rendition of the SM, adapted for DSM130 modules, and including the service bus as currently foreseen for the electrical SM prototype [6,9] as well as the SM Controller (SMC) at the end of each SM with the ABCN 130 nm CMOS ASIC. Neither unit has been optimised at this stage.…”

“…The development foresees the construction of DSM modules attached to a light but stable carbon-fibre based local support (LS) that provides a precise mechanical support for the DSM modules, and together with loaded DSM modules and their associated services is attached to carbon fibre cylinders in the central (barrel) region of the ITK. The development has used the result of a complementary electronics project (the ABCN 250 nm CMOS front-end ASIC) [10] to construct double-sided micro-strip silicon modules (DSM250), that have been operated successfully in a so-called 8-module electrical prototype [5,6,9]. The DSM250 modules have been demonstrated to fulfil the electrical requirements for the HL-LHC tracker, but detailed design work is still required for the optimised service design.…”