Avancerad sökning

Hittade 4 uppsatser som matchar ovanstående sökkriterier.

1. 1. Multi-spectral X-ray imaging with a laser-plasma accelerator

   Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Författare :Andrea Angella; [2022]
   Nyckelord :Multi-spectral imaging; single-photon counting; X-ray absorption spectroscopy; XAS; LWFA; laser-wakefield acceleration; K-edge; imaging; metal-detection algorithm; Physics and Astronomy;

   Sammanfattning : This master thesis focuses on the creation of an algorithm to perform multispectral imaging of a metallic target using X-rays. The generation of an ultrashort high-power low-divergent X-ray beam is performed by means of a Ti:Sapphire laser driven wake-field plasma accelerator. LÄS MER

3. 2. In-line Phase-contrast Tomography using Betatron X-rays Produced by a Laser-Plasma Accelerator

   Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Författare :Kristoffer Svendsen; [2017]
   Nyckelord :source size; x-ray; in-line; phase-contrast; phase contrast; LWFA; laser wakefield acceleration; tomography; diffraction; diffraction simulation; laser-plasma acceleration; Physics and Astronomy;

   Sammanfattning : X-ray phase-contrast imaging is a powerful technique that allows great resolving power for low absorbing samples, such as biological tissue. This method relies on measuring the phase shift induced by the sample instead of the absorption traditional radiography relies on. LÄS MER

4. 3. Exploring the Use of Graphene as a Target Material for Laser Plasma Ion Acceleration

   Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Atomfysik

   Författare :Hannes Pahl; [2017]
   Nyckelord :Laser Plasma Acceleration; Target Material; Graphene; Physics and Astronomy;

   Sammanfattning : The interaction of a solid target with an ultra-high intensity laser pulse can result in the laser plasma acceleration of ions. The recent proposal of a new laser plasma ion acceleration scheme, named chirped standing wave acceleration, has created interest in a new class of ultra-thin solid target materials, either freestanding or as a part of novel compound targets. LÄS MER

5. 4. Monte Carlo simulations and measurements of the radiation environment at a laser-plasma accelerator

   Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Författare :Jack Strand Berg; [2016]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : In current experiments at the high-power laser facility at the Lund Laser Centre, electrons accelerated to hundreds of MeV over short distances by means of laser wakefield acceleration in produced plasmas. To determine the amount of secondary radiation generated when accelerated electrons interact with surrounding materials is of interest to ensure a safe working environment. LÄS MER