New architecture demonstrator for very large X-ray Microcalorimeter arrays.

Postdoctoral researcher position at CEA/Saclay on the realisation of a New architecture demonstrator for very large X-ray Microcalorimeter arrays

The researcher will take care of managing the development of a representative X-ray Micro-calorimeter array based on a new type of architecture (planar based), a new detector, the High Resistivity TES, active feedback and SQUID-free multiplexing electronics, and a superconducting and thermally insulating multi-layer technology to achieve a real scientific "leap forward" that would constitute the realization of a very large space-based X-ray micro-calorimeter camera.

For the development of this demonstrator, we plan three main steps. First, we will build (batch L1) at the PTA (Plateforme Technologique Amont: Silicon Facility CEA/CNRS à Grenoble) an interconnection network (RI integrated circuit) corresponding to different pixel sizes, with ML pads of different thermal conductivity. In parallel, we will produce at IJCLab a set of different pixels each consisting of an NbSi sensor deposited on an absorber with insulation layers.

Once these two objects have been realised, we will hybridise several pixels on the RI circuit, and we will characterise them using the test device (electronic and mechanical) that we have already realised for our current development dedicated to the HR-TES (thesis in progress). Finally, we will produce (batch L3) a homogeneous array of a few optimised pixels (typically 16) that we will test with the multiplexed electronics that we are developing elsewhere (thesis in progress).

This position is funded for two years,  to start at a date to be agreed after 1st october 2022. The successful applicant will join the CEA/DRF/IRFU laboratory, located in Saclay near Paris. He/she will have the opportunity to work also at IJCLab at Orsay University (very nearby Saclay).

A PhD in spatial, cryogenic os Silicon facility technics is required at the time of the contract signature. The ideal candidate should be familiar with in micro X-ray calorimeters. Previous experience with cryo-electronics and/or cryo-measurements is higly desirable.

How to apply for this position: The applicants are invited to send via email a cover letter, a curriculum vitae, a brief statement of research interests (maximum 4 pages) with links to recent publications, and two letters of reference to Dr J.L. Sauvageot. The applications should ideally be received by 25 September 2022. After this date, the applications will be considered until the position is filled but before the end of 2022.