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Leonardo Rossi - IEEE Xplore Author Profile

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Hybrid pixel detectors have been used as vertex detectors in most of the Large Hadron Collider (LHC) experiments. Their truly 3D hit information, together with their efficiency, speed and radiation resistance make them ideal to reconstruct track and vertices in the harsh environment surrounding the LHC interaction region. Many technological challenges have been overcome to build those devices acco...Show More
A silicon pixel detector, developed in RD19, and consisting of 4 planes, /spl sim/30 cm/sup 2/ each, is operating for the first time in the lead ion experiment WA97 at CERN. The 288 CMOS readout chips are bump-bonded to 48 Si detector matrices, assembled in 8 identical arrays. The total number of pixel cells is nearly 300000 and each cell, 75 /spl mu/m/spl times/500 /spl mu/m, contains a complete ...Show More
An asynchronous version of a binary pixel readout circuit has been implemented in an array with 16 columns at 500 mu m pitch and 63 rows at 75 mu m pitch. This readout chip has been bonded with solder bumps to a silicon detector with matching pixel elements. Event information in a pixel can be strobed into a local memory by a trigger signal and subsequently read out. Without a strobe the informati...Show More
An asynchronous version of a binary pixel readabout circuit has been implemented in an array with 16 columns at 500 mu m pitch and 63 rows at 75 mu m pitch. This readabout chip has been bonded with solder bumps to a silicon detector with matching pixel elements. Event information in a pixel can be strobed into a local memory by a trigger signal and subsequently read out. Without a strobe the infor...
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The readout electronics of a silicon microstrip vertex detector aimed at finding secondary vertices for beauty identification is described. High density and high speed have been achieved, allowing the detector to take part in the trigger. Despite the large number of channels and thanks to the use of application-specific integrated circuits (ASICs), the amount of electronics needed for the readout ...Show More
The implementation of a trigger aimed at selecting those nuclear interactions which contain a charm particle is described. The trigger uses a fast emulator of the PDP-11 which calculates the impact parameter of the decaying charged tracks originating from the charm decay. An enrichment factor of 15 is thereby obtained. The results obtained show that, in its present implementation, this trigger, wh...Show More
For future large scale, long term applications of silicon particle detectors in high energy physics experiments, e.g. in proton or electron colliders, it is necessary to evaluate the reliability of such detectors. An automated measurement apparatus has been built, which is used to test planar silicon detectors for several days or weeks, both with and without irradiation. Defective detectors were s...Show More