The MCM contains three radiation hard ASICs and an 800 Mbit/s custom developed optical link for the data transfer between the detector and the control room. Each half stave is read out using a multi-chip module (MCM). An essential part of the half stave is a low-mass multi-layer flex that carries power, ground, and signals to the pixel chips. The tight material budget and the limitation in physical dimensions required by the detector design introduce new challenges for the integration of the on- detector electronics. Each pixel chip contains 8192 active cells, so the total number of pixel cells in the SPD is ≈107. The SPD includes 120 half staves each of which consists of a linear array of 10 ALICE pixel chips bump bonded to two silicon sensors. The ALICE silicon pixel detector (SPD) comprises the two innermost barrel layers of the ALICE inner tracker system. The ALICE silicon pixel detector front-end and read-out electronics During the first injection tests in June 2008 the SPD was able to record the very first sign of life of the LHC by registering secondary particles from the beam dumped upstream the ALICE experiment. The detector has been installed in the experiment in summer 2007. The pixel trigger system allows to apply a set of algorithms for the trigger selection, and its output is sent to the Central Trigger Processor (CTP).
A unique feature of the ALICE SPD is that it is capable of providing a prompt trigger signal, called Fast-OR, which contributes to the L0 trigger decision. This has set some stringent constraints on the design and construction of the SPD. The physics targets of the ALICE experiment require that the material budget of the SPD is kept within approximate to 1\\%X(0) per layer. It consists of two barrel layers of hybrid silicon pixel detectors at radii of 39 and 76 mm. The ALICE Silicon Pixel Detector (SPD) forms the two innermost layers of the ALICE Inner Tracking System (ITS). The constraints on material budget and detector module dimensions are very demanding.ĭetector performance of the ALICE silicon pixel detector
The on- detector read-out is based on a multi-chip-module containing 4 ASICs and an optical transceiver module. Each pixel chip contains 8192 active cells, so that the total number of pixel cells in the SPD is ≈ 107. The SPD includes 120 detector modules (half-staves) each consisting of 10 ALICE pixel chips bump bonded to two silicon sensors and one multi-chip read-out module. The ALICE silicon pixel detector (SPD) comprises the two innermost layers of the ALICE inner tracker system. Kluge, A Antinori, Federico Burns, M Cali, I A Campbell, M Caselle, M Ceresa, S Dima, R Elias, D Fabris, D Krivda, Marian Librizzi, F Manzari, Vito Morel, M Moretto, Sandra Osmic, F Pappalardo, G S Pepato, Adriano Pulvirenti, A Riedler, P Riggi, F Santoro, R Stefanini, G Torcato De Matos, C Turrisi, R Tydesjo, H Viesti, G PH-EP The ALICE Silicon Pixel Detector System (SPD)
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