PhD position on study of cryogenic radiofrequency absorbers (M/F)

Job Description

Thesis Subject

High-current particle accelerators suffer from strong wake-fields in the radiofrequency (RF) range induced by the charged particles passing through the superconducting accelerating cavities. Such wake-field RF could deflect the subsequent beam and also heat up the cavities; thus, RF absorbers need to be installed to eliminate such wake-field in a controlled way. The PhD student will work on developing the RF absorbers around the 800 MHz superconducting cavities for the PERLE accelerator locally at IJCLab and Future Circular Collider in collaboration with CERN. In particular, the PERLE configuration requires efficient RF absorption in cryogenic environment where the material properties of absorbers (dielectric ceramics) have not been very well studied. This project is dedicated to developing a test-stand to measure dielectric properties of such absorbers in cryogenic environment and develop wake-field simulations out of the measured material parameters. Eventually, the student will design, develop, and test the Beam Line Absorbers (BLA) for the PERLE accelerator. The main objective is divided by the following four tasks.
Task 1: Investigate existing test-stands in the world (Fig. 6) to understand their functionality and limitations
Task 2: Develop test-stand of lossy dielectric materials in IJCLab to obtain material parameters as a function of temperature and frequency in collaboration with dark matter and radioastronomy projects
Task 3: Using the parameters obtained in task 1-2, perform comprehensive wake-field simulation of accelerator cryomodules such as PERLE/iSAS and/or FCCee in collaboration with CERN, BNL, and JLAB
Task 4: Based on the results in task 3, determine and propose the optimal configurations of RF absorbers in the PERLE cryomodule

Your Work Environment

The Irène Joliot-Curie Physics Laboratory of 2 Infinities (IJCLab) is a UMR under the supervision of the CNRS (IN2P3), the University of Paris-Saclay and the University of Paris is located on the campus of the University of Paris -Saclay in Orsay. The laboratory is located on the campus of the Université Paris-Sud, Université Paris-Saclay in Orsay. The campus is located 20 km south of Paris and easily accessible by RER in 35 minutes.
IJCLab was born in 2020 from the merger of five units (CSNSM, IMNC, IPN, LAL, LPT). The staff is made up of nearly 560 permanent (340 engineers, technicians and administrators and 220 researchers and teacher-researchers) and approximately 200 non-permanent including 120 doctoral students. The research themes of the laboratory are nuclear physics, high energy physics, theoretical physics, astroparticles, astrophysics and cosmology, particle accelerators, energy and the environment and health. IJCLab has very significant technical capacities (around 280 IT) in all the major fields required to design, develop / implement the experimental devices necessary for its scientific activity, as well as the design, development and use of instruments. .
The PhD student will work in the RF group of the Laboratory which is involved in the development of superconducting cavities of multiple national and international accelerator projects, such as PERLE, FCC, ESS, Spiral2, MYRRHA, etc.
The group includes around 15 physicists (permanent researchers, post-docs and doctoral students).

Compensation and benefits

Compensation

2300 € gross monthly

Annual leave and RTT

44 jours

Remote Working practice and compensation

Pratique et indemnisation du TT

Transport

Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€

About the offer

About the CNRS

The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.

CNRS

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