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Title: The Assembly of the ALICE Silicon Pixel Detector

Abstract

The Silicon Pixel Detector (SPD) is the innermost part of the Inner Tracking System (ITS) of the ALICE experiment at LHC. It consists of 240 detector ladders containing in total about 10 million 50 x 425 {mu}m2 pixel cells that have to be assembled on ten carbon fibre support and cooling sectors. The mounting procedure of the basic SPD modules (Half-Staves) and the assembly of the barrel sectors are presented. Results on the assembly of the first sector are reported.

Authors:
 [1];  [2]
  1. Dipartimento di Fisica dell'Universita, via Marzolo 8, I-35131, Padova (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
21054846
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 884; Journal Issue: 1; Conference: 6. Latin American symposium on nuclear physics and applications, Iguazu (Argentina), 3-7 Oct 2005; Other Information: DOI: 10.1063/1.2710610; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CARBON FIBERS; CERN LHC; COOLING; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; SI SEMICONDUCTOR DETECTORS

Citation Formats

Moretto, S., and INFN, via Marzolo 8, I-35131, Padova. The Assembly of the ALICE Silicon Pixel Detector. United States: N. p., 2007. Web. doi:10.1063/1.2710610.
Moretto, S., & INFN, via Marzolo 8, I-35131, Padova. The Assembly of the ALICE Silicon Pixel Detector. United States. doi:10.1063/1.2710610.
Moretto, S., and INFN, via Marzolo 8, I-35131, Padova. Mon . "The Assembly of the ALICE Silicon Pixel Detector". United States. doi:10.1063/1.2710610.
@article{osti_21054846,
title = {The Assembly of the ALICE Silicon Pixel Detector},
author = {Moretto, S. and INFN, via Marzolo 8, I-35131, Padova},
abstractNote = {The Silicon Pixel Detector (SPD) is the innermost part of the Inner Tracking System (ITS) of the ALICE experiment at LHC. It consists of 240 detector ladders containing in total about 10 million 50 x 425 {mu}m2 pixel cells that have to be assembled on ten carbon fibre support and cooling sectors. The mounting procedure of the basic SPD modules (Half-Staves) and the assembly of the barrel sectors are presented. Results on the assembly of the first sector are reported.},
doi = {10.1063/1.2710610},
journal = {AIP Conference Proceedings},
number = 1,
volume = 884,
place = {United States},
year = {Mon Feb 12 00:00:00 EST 2007},
month = {Mon Feb 12 00:00:00 EST 2007}
}
  • The ALICE Silicon Pixel Detector (SPD) is constituted by two barrel layers with {approx_equal}107 hybrid pixel cells. The basic detector element is the Half-Stave (HS), an array of two ladders, each composed of 5 pixel chips bump bonded to a Si sensor matrix. The ladders are mounted on a low-mass aluminum/polyimide multilayer bus for power distribution and signal routing. The assembly procedures of the half-staves and their mounting on the carbon fiber support sectors, implemented on high precision measuring tables, with computerized controllers for positioning and gluing, are described, and the present status of construction is overviewed.
  • The Inner Tracking System (ITS) of the ALICE experiment is made of position sensitive detectors which have to operate in a region where the track density may be as high as 50 tracks/cm{sup 2}. To handle such densities detectors with high precision and granularity are mandatory. The Silicon Pixel Detector (SPD), the innermost part of the ITS, has been designed to provide tracking information close to primary interaction point. The assembly of the entire SPD has been completed.
  • The silicon vertex tracker (VTX) will be installed in the summer of 2010 to enhance the physics capabilities of the Pioneering High Energy Nuclear Interaction eXperiment (PHENIX) experiment at Brookhaven National Laboratory. The VTX consists of two types of silicon detectors: a pixel detector and a strip detector. The pixel detector consists of 30 pixel ladders placed on the two inner cylindrical layers of the VTX. The ladders are required to be assembled with high precision, however, they should be assembled in both cost and time efficient manner. We have developed an assembly bench for the ladder with several assemblymore » fixtures and a quality assurance (Q/A) system using a 3D measurement machine. We have also developed an assembly procedure for the ladder, including a method for dispensing adhesive uniformly and encapsulation of bonding wires. The developed procedures were adopted in the assembly of the first pixel ladder and satisfy the requirements.« less
  • The ALICE experiment studies the properties of quark-gluon plasma and requires a good tracking system. This document presents the silicon drift detector which is part of the Inner Tracking System. Its principle and main features are given, especially its sensitivity to temperature variation and the effect of parasitic fields on measurement. Finally, the typical spatial resolution of this detector, which has been measured during beam tests, is shown.
  • The authors report the results obtained with a novel readout system for scintillating fibers and x-ray imaging based on the combination of a silicon pixel detector and one stage of light amplification using a 2nd generation image intensifier. The pixel detector is a hybrid assembly of a high resistivity silicon detector bump-bonded to a CMOS binary readout chip and can be read out a speed of 15 MHz. Each pixel element measures 75{micro}m x 500{micro}m. Scintillating fiber ribbons and scintillating crystals are coupled to the detector array using one stage of light amplification provided by a micro-channel plate (MCP) imagemore » intensifier with fiberoptic faceplates. They have used the system to image electron tracks in a bundle /of scintillating fiber ribbons. Further they have shown how the system can be used for imaging 122 keV x-rays such as those used in nuclear medicine. The system provides the possibility of single photon counting, high spatial resolution and Compton rejection.« less