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Reference : UMR7178-REGSOM-076
Workplace : STRASBOURG
Date of publication : Monday, May 03, 2021
Scientific Responsible name : BAUDOT Jérôme
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Monolithic CMOS pixel sensor or MAPS offer key features to build highly granular and light charged particles trackers in high-energy physics experiments. A larger number of future large experiments consider using this technology, which brings new demands on the sensor specifications while keeping a small pixel size and a low power dissipation. Two prominent of these new requirements concern the hit rate capability and the size of the sensitive area.
The so-called stitching technique allows fabricating CMOS chips at the wafer-scale, with one dimension exceeding 20 cm, resulting in area of several hundreds of cm2. Such sensor will feature few tens of million of pixels. Combined with hit rate in excess of 100 MHz/cm2, such pixel matrix will generate an enormous quantity of data overwhelming current read-out strategies.
This thesis proposes to develop innovative ways to deal with the internal data flow of such sensors, obviously having in mind to optimize three major criteria: allowing a maximal hit rate on pixels, coping with distances in excess of 10cm between pixels and the circuit output and minimizing the power dissipation in the matrix. Asynchronous architectures for such readouts will be of particular interest for this research. The case of the future large sensor (28x10 cm2) for the ALICE experiment at Cern will be used as a prominent application for this development.
The doctoral student will work within the core facility C4Pi of IPHC. With about twenty engineers, post-doctorant fellows and PhD students, the C4Pi is a major group on the international stage for the development of CMOS pixel sensors (MAPS) for the detection of charged particles dedicated to high-energy physics. C4Pi collaborates with various groups at the national level and with the large world laboratories like CERN (Geneva), DESY(Hamburg) and KEK(Tsukuba).
The PhD student will benefit from a dynamic environment where different R&D projects are on-going, which allows for frequent chip fabrications. C4Pi also offer powerful test equipments to characterize prototypes.
Constraints and risks
The future student will work daily with scientific English and within international collaborations. Strong team-work ability and motivation to visit foreign laboratories are strongly welcome.
Applications must include the following documents
• A cover letter
• A detailed CV including list of internships or projects in microelectronics
• Transcript of results obtained during the Master studies (for completed semesters)
• At least two recommendation letters directly sent by the referees
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