PhD subjects

2 sujets IRFU/DACM

Dernière mise à jour : 13-11-2018


• Accelerators physics

• Solid state physics, surfaces and interfaces

 

Light Ion Source Optimisation for High Intensity production

SL-DRF-19-0298

Research field : Accelerators physics
Location :

Département des Accélérateurs, de Cryogénie et de Magnétisme (DACM)

Laboratoire d'Etudes et de Développements pour les Accélérateurs (LEDA)

Saclay

Contact :

Olivier TUSKE

Starting date :

Contact :

Olivier TUSKE

CEA - DRF/IRFU/SACM/LEDA

+33 1 69 08 68 20

Thesis supervisor :

Olivier TUSKE

CEA - DRF/IRFU/SACM/LEDA

+33 1 69 08 68 20

Since more than 20 years, CEA Saclay developed and built high intensity ion sources for accelerators, mainly heated by the electronic cyclotronic resonnant mechanism (ECR). The experience of the CEA is well recognize worldwide, our group was chosen to built ion sources for different facilities: IFMIF/LIPAc (Japan), SPIRAL2 facility (France) and FAIR in Germany.

High performances, in particular the high reliability of our ions sources made them essential for futur high intensity neutron source for fusion reactor material research, or experiences in neutron diffraction or cancer cure with the boron neutron capture therapy (BNCT).

The aim of this thesis is to provide us to a better understanding of the physical phenomena inside the ion sources, as the microwave-plasma interaction/coupling, or the plasma confinement. The primary goal is to optimize beam quality for ions sources, in term of stability in time, in homogeneity and purity but also to increase the extracted current far beyond actual performances. Compact ion sources with a better efficiency are also expected.

This ambitious program could be only validated with various experimental measurements at Saclay on a plasma reactor or on an extracted intense light ion beam with dedicated diagnostics.

Mastering high intensity beam production is the key of the future. Those innovative ion sources will play a large part in maintaining CEA leadership in the field of light ion sources and also in particles accelerators.

Nano Hetero structure for next generation superconducteurs under intense RF fields

SL-DRF-19-0425

Research field : Solid state physics, surfaces and interfaces
Location :

Département des Accélérateurs, de Cryogénie et de Magnétisme (DACM)

Laboratoire d’Intégration et Développement des Cavités et Cryomodules (LIDC2)

Saclay

Contact :

thomas proslier

Claire ANTOINE

Starting date :

Contact :

thomas proslier

CEA - DRF/IRFU/SACM/LIDC2

0169088711

Thesis supervisor :

Claire ANTOINE

CEA - DSM/IRFU/SACM/LIDC2

+33 169 08 73 28

Laboratory link : http://irfu.cea.fr/dacm/Phocea/Vie_des_labos/Ast/ast_groupe.php?id_groupe=3301

Since their discoveries at the beginning of the twentieth century, the unique properties of superconductivity have been used in a wide variety of applications from powerful electromagnets used in MRIs and fusion reactors, to next generation electronic fast digital circuits (Quantum-bits) and particle accelerators. Major causes for performance limitations in a superconductor originate from its interaction with external electro-magnetic fields which are responsible for the entire electromagnetic behavior of applied superconducting materials. We propose an original approach to mitigate the superconducting dissipation originating from deleterious vortices: a new superconducting multilayer as efficient screening structure to inhibit vortices entry into the bulk superconductor. The synthesis and design of these nano hetero-structures by Atomic Layer Deposition will be optimized and tailored to drastically improve the performance of a superconductor-based device: superconducting radio frequency (SRF) cavities.

The PhD student will be an important active part of the synergistic approach between synthesis, design, characterization and performance tests of the most effective screening hetero-structures based on the superconducting nitride alloys NbN, NbTiN, MoN and insulating materials AlN, MgO, SrTiO3 in order to provide a technological breakthrough towards unprecedented superconductor performances for superconducting resonators. This 3 years program will focus on three research thrusts or work packages:

1- Explore synthetic routes to deposit innovative hetero-structures. Years 1-2.

2- Tailor hetero-structure properties to optimize superconductor performances. Years 2-3

3- Test optimized hetero-structure on superconducting Nb resonators. Year 3.

 

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