P. Nilsson

The Alice silicon pixel detector

CERN European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland Universita degli Studi di Padova, I-35131, Padova, Italy Dipartimento IA di Fisica e Sez. INFN di Bari, I-70126,Bari,Italy Comenius University, SK-84215 Bratislava, Slovakia NIKHEF, National Institute for Nuclear Physics and High Energy Physics, 1098 SJ Amsterdam, The Netherlands Slovak Academy of Sciences, SK-04353, Kosice, Slovakia Universita di Roma I, La Sapienza, I-00185, Roma, Italy

The silicon pixel detector (SPD) for the ALICE experiment

The ALICE silicon pixel detector (SPD) constitutes the two innermost layers of the inner tracking system (ITS). The basic building block of the SPD is the half-stave carrying two detector ladders. The half-stave is equipped with a multi-chip module (MCM) and an optical fibre link for control and readout. A 5-layer aluminium/polyimide bus ensures the distribution of power and signals on each half-stave. The half-staves are mounted on a light-weight carbon-fibre structure with an integrated evaporative cooling system. An overview of the SPD development and the current status of the construction are presented.

Performance of ALICE silicon pixel detector prototypes in high energy beams

The two innermost layers of the ALICE inner tracking system are instrumented with silicon pixel detectors. Single chip assembly prototypes of the ALICE pixels have been tested in high energy particle beams at the CERN SPS. Detection efficiency and spatial precision have been studied as a function of the threshold and the track incidence angle. The experimental method, data analysis and main results are presented.

The Assembly of the first Sector of the ALICE Silicon Pixel Detector

The Silicon Pixel Detector (SPD) is the innermost part of the Inner Tracking System (ITS) of the ALICE experiment at LHC. 240 detector ladders containing in total about 10 million pixel cells with dimension 50 × 425 µm2, have to be assembled on a carbon fibre support. 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.

Integration and test of the ALICE SPD readout chain

The silicon pixel detector (SPD) is the innermost element of the ALICE inner tracking system (ITS). The on-detector electronic system consists of several ASICs in a commercial 0.25μm CMOS process (radiationhardened by design), a low-mass multi layer Kapton cable for power and signal distribution (pixel bus), and a multi-chip module that includes a custom designed, very compact optical transceiver. The control and readout data transmission is done via optical fibres. Prototypes of the full read-out chain have been produced and tested. Integration issues and test results are presented and discussed.

Beam Test Performance and Simulation of Prototypes for the ALICE Silicon Pixel Detector

The silicon pixel detector (SPD) of the ALICE experiment in preparation at the Large Hadron Collider (LHC) at CERN is designed to provide the precise vertex reconstruction needed for measuring heavy flavor production in heavy ion collisions at very high energies and high multiplicity. The SPD forms the innermost part of the Inner Tracking System (ITS) which also includes silicon drift and silicon strip detectors. Single assembly prototypes of the ALICE SPD have been tested at the CERN SPS using high energy proton/pion beams in 2002 and 2003. We report on the experimental determination of the spatial precision. We also report on the first combined beam test with prototypes of the other ITS silicon detector technologies at the CERN SPS in November 2004. The issue of SPD simulation is briefly discussed.

THE ALICE SILICON PIXEL DETECTOR (SPD)

G. ANELLI, F. ANTINORI, A. BOCCARDI, M. BURNS, I. A. CALI, M. CAMPBELL, P. CHOCHULA, R. DINAPOLI, D. ELIA, F. FORMENTI, A. O. GINER, M. KRIVDA, V. LENTI, V. MANZARI, M. MOREL, P. NILSSON, A. PEPATO, P. RIEDLER, R. SANTORO, G. STEFANINI CERN European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland Universita degli Studi di Padova, I-35131, Padova, Italy Dipartimento IA di Fisica e Sez. INFN di Bari, I-70126, Bari ,Italy Slovak Academy of Sciences, SK-04353, Kosice, Slovakia ASP-Associazione per lo Sviluppo Scientifico e Technologico del Piemonte, I-10133 Torino, Italy

The ALICE silicon pixel detector readout system : moving towards system integration

A number of key components have been designed, produced and tested for the readout system of the Alice Silicon Pixel Detector (SPD). This paper gives an overview of the system, describes the results obtained from the individual components as well as the software and hardware of the Data Acquisition System.