Déformations mécaniques de l'hydrogène solide pour la fabrication de cibles cryogéniques continues submillimétriques pour l'accélération laser-plasma

Abstract : The interaction between a high-energy laser and a thin hydrogen target can generate an electrostatic field accelerating protons up to a few tens of MeV. This scientific field is called "laser/plasma acceleration". In this context, the Low Temperature Laboratory (CEA, France) has designed in 2014 a prototype extruding thin solid-hydrogen ribbon-shaped targets of onemillimeter in width and a few tens of micrometers in thickness.This Ph.D. thesis studies the geometry, the stability and the velocity of these ribbons, which are critical in the laser/matter interaction. Experimental campaigns led with this prototype in different laser facilities are described as well. The second and main objective of this Ph.D. thesisis to charaterize and measure the rheological properties of solid Hydrogen, in order to model its flow through a submillimeter-wide extrusion nozzle. This characterisation has been made possible through the design of an innovative cryogenic rheometer generating a continuous shear deformation in solid hydrogen at controled temperature, below 14 kelvins. Shear deformationof solid Hydrogen is studied and detailled, and its apparent viscosity near its melting point is measured. A deformation law is stated, then tested by numerical simulation.
Complete list of metadatas

Cited literature [110 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02280969
Contributor : Abes Star <>
Submitted on : Friday, September 6, 2019 - 6:29:07 PM
Last modification on : Sunday, September 8, 2019 - 1:17:54 AM

File

MICHAUX_2019_archivage.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02280969, version 1

Collections

Citation

Sylvain Michaux. Déformations mécaniques de l'hydrogène solide pour la fabrication de cibles cryogéniques continues submillimétriques pour l'accélération laser-plasma. Dynamique des Fluides [physics.flu-dyn]. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAY010⟩. ⟨tel-02280969⟩

Share

Metrics

Record views

236

Files downloads

24