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Papers by Claude Colledani

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

The ILD detector is proposed for an electron-positron collider with collision centre-of-mass ener... more The ILD detector is proposed for an electron-positron collider with collision centre-of-mass energies from 90~\GeV~to about 1~\TeV. It has been developed over the last 10 years by an international team of scientists with the goal to design and eventually propose a fully integrated detector, primarily for the International Linear Collider, ILC. In this report the fundamental ideas and concepts behind the ILD detector are discussed and the technologies needed for the realisation of the detector are reviewed. The document starts with a short review of the science goals of the ILC, and how the goals can be achieved today with the detector technologies at hand. After a discussion of the ILC and the environment in which the experiment will take place, the detector is described in more detail, including the status of the development of the technologies foreseen for each subdetector. The integration of the different sub-systems into an integrated detector is discussed, as is the interface b...

The International Large Detector, ILD, is a detector concept which has been developed for the ele... more The International Large Detector, ILD, is a detector concept which has been developed for the electron-positron collider ILC. The detector has been optimized for precision physics in a range of energies between 90 GeV and 1 TeV. ILD features a high precision, large volume combined silicon and gaseous tracking system, together with a high granularity calorimeter, all inside a 3.5 T solenoidal magnetic field. The paradigm of particle flow has been the guiding principle of the design of ILD. In this document the required performance of the detector, the proposed implementation and the readiness of the different technologies needed for the implementation are discussed. This is done in the framework of the ILC collider proposal, now under consideration in Japan, and includes site specific aspects needed to build and operate the detector at the proposed ILC site in Japan.

CMOS sensors are being developed to equip a vertex detector offering the perfomances required for... more CMOS sensors are being developed to equip a vertex detector offering the perfomances required for the physics programme at the International Linear Collider. The progress realised from Spring 2003 to Spring 2005 is exposed in this report. It addresses the exploration of new fabrication processes, the design of fast integrated signal processing micro-circuits, the assessment and improvement of the radiation tolerance, the reduction of the power dissipation, the thinning of the sensors, the design of a light mechanical support and cooling studies. Progresses were also achieved on a detector design exploiting the features of CMOS sensors. Since several performance requirements are dictated by the beamstrahlung electron rate, the latter was revisited and assessed with improved accuracy. The constraints coming out from this study are significantly more stringent than those written in the TESLA TDR.

A novel Monolithic Active Pixel Sensor (MAPS) for charged particle tracking is presented. The par... more A novel Monolithic Active Pixel Sensor (MAPS) for charged particle tracking is presented. The partially depleted thin epitaxial layer of a low-resistivity silicon wafer is used as a sensitive detector volume from which the charge liberated by ionising particles is collected by diffusion. The sensor is a photodiode within a special structure allowing the high detection efficiency required for tracking applications. Two prototypes have been designed and fabricated using standard 0.6 and 0.35micron CMOS processes. Results of the first prototype are presented, which is made of four arrays, each containing 64×64 pixels with a readout pitch of 20 microns in both directions. Extensive tests made with a soft X-ray source (Fe) and beams of minimum ionising particles (pions of 15 and 120 GeV/c) at CERN have demonstrated the predicted performance. The individual pixel noise of around 12 ENC leads to an extremely favourable signal to noise ratio for minimum ionising particles for which over 100...

CMOS Monolithic Active Pixel Sensors (MAPS) have demonstrated their strong potential for tracking... more CMOS Monolithic Active Pixel Sensors (MAPS) have demonstrated their strong potential for tracking devices, particularly for flavour tagging. They are foreseen to equip several vertex detectors and beam telescopes. Most applications require high read-out speed, imposing sensors to feature digital output with integrated zero suppression. The most recent development of MAPS at IPHC and IRFU addressing this issue will be reviewed. An architecture will be presented, combining a pixel array, column-level discriminators and zero suppression circuits. Each pixel features a preamplifier and a correlated double sampling (CDS) micro-circuit reducing the temporal and fixed pattern noises. The sensor is fully programmable and can be monitored. It will equip experimental apparatus starting data taking in 2009/2010.

The APVD[1,2], an integrated circuit for the front-end electronics of DC-coupled silicon detector... more The APVD[1,2], an integrated circuit for the front-end electronics of DC-coupled silicon detectors has been developed and produced in the radiation-hard process DMILL for the CMS experiment. This paper reports very briefly on the final test results, more details will be published elsewhere. I. SUMMARY The APVD_DC contains, like other members of the APV[3] family 128 identical analogue channels, each com-posed of a low noise preamplifier, a CR-RC shaper, an analogue pipeline of 160 cells and a signal processing stage[1,2]. A current compensation circuit is added in every preamplifier to sink the leakage current coming from a DC coupled silicon detector. The circuit has been tested and measured in the presence of significant DC-currents up to 11 microampere, without deterioration of the analogue performance of the circuit like pulse shape or dynamic range. The noise increases by about 300 ENC as is shown in figure 1, small compared to the additional shot-noise. Figure 1: The measured ...

Designed and manufactured in a commercial CMOS 0.35 μm OPTO process for equipping the EUDET beam ... more Designed and manufactured in a commercial CMOS 0.35 μm OPTO process for equipping the EUDET beam telescope, MIMOSA26 is the first reticule size pixel sensor with digital output and integrated zero suppression. It features a matrix of pixels with 576 rows and 1152 columns, covering an active area of ~224 mm. A single point resolution of about 4 μm was obtained with a pixel pitch of 18.4 μm. Its architecture allows a fast readout frequency of ~10 k frames/s. The paper describes the chip design, test and major characterisation outcome.

$Research paper thumbnail of A 128 channels analog readout chip ($APVD_{DC}$) for DC-coupled silicon detectors of the CMS tracker$

The APVD_DC realised in the DMILL technology is a radiation-hard integrated circuit for front-end... more The APVD_DC realised in the DMILL technology is a radiation-hard integrated circuit for front-end readout electronics of the silicon tracker of CMS. DC-coupled silicon microstrip detectors have significant economical advantages compared to AC-coupled devices mainly due to their less complex fabrication process and better yield. The APVD_DC allows the use of DCcoupled silicon detectors with significant leakage currents as it is expected due to irradiation after several years of LHC operation. In this paper, a solution is presented with an active individual leakage current compensation technique for each input channel. The APVD_DC contains 128 identical analogue channels, each one composed of a low noise preamplifier, a CR-RC shaper, a 160 cells-deep analogue pipeline and an analogue signal processing stage. A deconvolution filter at the latest stage recuperates the initial fast response function of a silicon detector and confines it to one LHC bunch crossing. The 128 analogue channel...

Proceedings Eleventh Annual IEEE International ASIC Conference (Cat. No.98TH8372)

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2006

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010