G. Barbier

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

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 × 1034 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 super-module prototype are described and its electrical performance is presented in detail.

Double-sided silicon strip modules for the ATLAS tracker upgrade in the High-Luminosity LHC

The Large Hadron Collider (LHC) will be upgraded in ~ 2022 to enable peak luminosities of ~ 5 × 1034 cm−2 s−1. In the period until ~ 2030, an integrated luminosity of ~ 3000 fb−1 is targeted, an order of magnitude increase. For ATLAS, an upgrade scenario will imply the complete replacement of its internal tracker. An all-silicon based tracker (pixels in the innermost layers, strips at outer radii) is currently being designed. The super-module is an integration concept for the barrel short and long-strip region of the future ATLAS tracker in which double-sided silicon micro-strip modules are assembled into a local support structure. A super-module prototype for eight strip modules has been built. The main components of the current prototype are described. First electrical results with DC-DC power converters are presented.

Performance of the ATLAS silicon strip detector modules

Abstract The performance of the silicon strip detector prototypes developed for use in ATLAS at the LHC is reported. Baseline detector assemblies (“modules”) of 12 cm length were read out with binary electronics at 40 MHz clock speed. For both irradiated and unirradiated modules, the tracking efficiency, noise occupancy, and position resolution were measured as a function of bias voltage, binary hit threshold, and detector rotation angle in a 1.56 T magnetic field. Measurements were also performed at a particle flux comparable to the one expected at the LHC.

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

It is expected that after several years of data-taking, the Large Hadron Collider (LHC) physics programme will be extended to the so-called High-Luminosity LHC, where the instantaneous luminosity will be increased up to 5 × 1034 cm−2 s−1. For the general-purpose ATLAS experiment at the LHC, a complete replacement of its internal tracking detector will be necessary, as the existing detector will not provide the required performance due to the cumulated radiation damage and the increase in the detector occupancy. The 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 (SM) is an integration concept proposed for the barrel strip region of the future ATLAS tracker, where double-sided stereo silicon micro-strip modules (DSM) are assembled into a low-mass local support (LS) structure. Mechanical aspects of the proposed LS structure are described.

R&D towards the module and service structure design for the ATLAS inner tracker at the super LHC (SLHC)

We have designed modules and a service structure of silicon microstrip detectors as a part of the ATLAS inner tracker for the SLHC project on the basis of a modular and replaceable concept. Six modules have been completed with common components and by similar procedures. Single module tests and four-module combined tests were performed at each site and have been compared for crosschecking. Details of the module design and electrical performance are presented. A half-module was irradiated up to 5 × 1014 1-MeV neq/cm2 using 24-GeV protons at the CERN PS. Its electrical performance was investigated before and after irradiation. The design of an eight-module structure, which is insertable to and is replaceable from the overall structure, has also been reported.

Pulse height of MIP's in an n-side silicon microstrip detector after proton irradiation with a fluence of 1x10**15 p cm**(-2)

We have irradiated an n-side silicon microstrip detector to an equivalent high energy fluence of 1/spl times/10/sup 15/ p cm/sup -2/ using 55 MeV protons. We determined the median pulse height to be 0.7 fC at a bias voltage of 180 V, and deduced a depletion region of about 80 /spl mu/m.