2 sujets IRFU/DEDIP

Dernière mise à jour :


• Nuclear physics

 

DESIGN OF A MONOLITHIC PIXEL SENSOR FOR PARTICLE PHYSICS WITH AN EMBEDDED ADAPTIVE READOUT ELECTRONICS

SL-DRF-24-0349

Research field : Nuclear physics
Location :

Département d’Electronique, des Détecteurs et d’Informatique pour la physique (DEDIP)

Systèmes Temps Réel, Electronique d’Acquisition et Microélectronique

Saclay

Contact :

Fabrice Guilloux

Stefano PANEBIANCO

Starting date : 01-10-2024

Contact :

Fabrice Guilloux
CEA - DRF/IRFU/DEDIP/STREAM

33 1 69 08 67 31

Thesis supervisor :

Stefano PANEBIANCO
CEA - DRF/IRFU/DPhN/LQGP

0169087357

In current and future high-energy physics experiments (i.e. upgrades of large detectors at the LHC and experiments in future colliders), the granularity of particle detectors continues to increase, and the use of multi-channel submicron integrated circuits has become a standard.

This granularity was taken one step further in the field of "Monolithic Active Pixel Sensor" (MAPS) technology, where pixel sizes can be as small as 10 x 10 µm2. These small pixels make it possible to achieve record spatial resolutions or greatly improve the radiation resistance of the trace detector, at the cost of a large quantity of data produced. This large amount of data is acceptable where a maximum spatial resolution is required, but can be prohibitive when this is not necessary, or when space and consumption constraints put limits on the number of fast downstream links.

Each experiment therefore requires to redefine the combination of the pixel size and the architecture of the detector's readout electronics, in order to meet the occupancy rate requirements of each physics experiment, and the detector's readout capabilities.
A major innovation in the design of pixel sensors for particle physics is to decouple the pixel matrix from the data rate sent.
As part of a team that has been developing MAPS since 1999, the approach required for the thesis is in a first step to study the existing trace detector architecture in order to understand its limitations in terms of radiation resistance. In a second step, the thesis will focus on information grouping options, assessing the impact of these options on data reduction as well as on induced information loss.

This will be supported by the design of a system-on-chip architecture, including pixel array optimization and digital processing, validating the work carried out in an integrated circuit.

To this end, this thesis will focus specifically on one of the major experiments at the European Center for Nuclear Research (CERN): the Upstream Tracker detector for the LHC Beauty Quark Experiment (LHCb).
Imaging with Micromegas detectors with Optical readout

SL-DRF-24-0102

Research field : Nuclear physics
Location :

Département d’Electronique, des Détecteurs et d’Informatique pour la physique (DEDIP)

DÉtecteurs: PHYsique et Simulation

Saclay

Contact :

Thomas PAPAEVANGELOU

Esther FERRER RIBAS

Starting date : 01-10-2024

Contact :

Thomas PAPAEVANGELOU
CEA - DRF/IRFU/DEDIP/DEPHYS

01 69 08 2648

Thesis supervisor :

Esther FERRER RIBAS
CEA - DRF/IRFU/DEDIP/DEPHYS

0169083852

Personal web page : https://irfu.cea.fr/Pisp/esther.ferrer-ribas/

Laboratory link : https://irfu.cea.fr/Phocea/Vie_des_labos/Ast/ast_sstheme.php?id_ast=4218

Recent developments have shown that coupling a Micromegas gaseous detector on a glass substrate with a transparent anode and a CCD camera enable the optical readout of Micromegas detectors with an impressive spatial resolution showing that the glass Micromegas detector is well-suited for imaging. This feasibility test has been effectuated with low-X-ray photons permitting energy resolved imaging. This test opens the way to different applications. Here we will focus, on one hand, on neutron imaging for non-destructive examination of highly gamma-ray emitting objects, such as fresh irradiated nuclear fuel or radioactive waste and on the other hand, we would like to develop a beta imager at the cell level in the field of anticancerous drug studies.
Both applications require gas simulations to optimize light yields, optimization of the camera operation mode and design of the detectors in view of the specific constraints of reactor dismantling and medical applications: spatial resolution and strong gamma suppression for neutron imaging and precise rate and energy spectrum measurements for the beta. The image acquisition will be optimized for each case and dedicated processing algorithms will be developed.

 

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