Oxford Centre for High Energy Density Science (OxCHEDS): publications

Multi-Pulse Laser Wakefield Acceleration: A New Route to Efficient, High-Repetition-Rate Plasma Accelerators and High Flux Radiation Sources

(2014)

Authors:

SM Hooker, R Bartolini, SPD Mangles, A Tünnermann, L Corner, J Limpert, A Seryi, R Walczak

Scaling of Magneto-Quantum-Radiative Hydrodynamic Equations: From Laser-produced Plasmas to Astrophysics

(2014)

Authors:

Joseph E Cross, Brian Reville, Gianluca Gregori

Proton-driven plasma wakefield acceleration: a path to the future of high-energy particle physics

(2014)

Authors:

AWAKE Collaboration, R Assmann, R Bingham, T Bohl, C Bracco, B Buttenschon, A Butterworth, A Caldwell, S Chattopadhyay, S Cipiccia, E Feldbaumer, RA Fonseca, B Goddard, M Gross, O Grulke, E Gschwendtner, J Holloway, C Huang, D Jaroszynski, S Jolly, P Kempkes, N Lopes, K Lotov, J Machacek, SR Mandry, JW McKenzie, M Meddahi, BL Militsyn, N Moschuering, P Muggli, Z Najmudin, TCQ Noakes, PA Norreys, E Oz, A Pardons, A Petrenko, A Pukhov, K Rieger, O Reimann, H Ruhl, E Shaposhnikova, LO Silva, A Sosedkin, R Tarkeshian, RMGN Trines, T Tuckmantel, J Vieira, H Vincke, M Wing, G Xia

Imaging Lattice dynamics in individual nanocrystals

Optics Infobase Conference Papers (2014)

Authors:

JN Clark, L Beitra, G Xiong, A Higginbotham, DM Fritz, HT Lemke, D Zhu, M Chollet, GJ Williams, M Messerschmidt, B Abbey, RJ Harder, AM Korsunsky, JS Wark, IK Robinson

Abstract:

We report imaging of coherent acoustic phonons on the picosecond time scale within a single nanocrystal using an X-ray free-electron laser. Our results allow unprecedented comparison with predictive models and observation of the vibrational modes. © 2014 OSA.

Molecular dynamics simulations of shock-induced plasticity in tantalum

High Energy Density Physics 10:1 (2014) 9-15

Authors:

D Tramontina, P Erhart, T Germann, J Hawreliak, A Higginbotham, N Park, R Ravelo, A Stukowski, M Suggit, Y Tang, J Wark, E Bringa

Abstract:

We present Non-Equilibrium Molecular Dynamics (NEMD) simulations of shock wave compression along the [001] direction in monocrystalline Tantalum, including pre-existing defects which act as dislocation sources. We use a new Embedded Atom Model (EAM) potential and study the nucleation and evolution of dislocations as a function of shock pressure and loading rise time. We find that the flow stress and dislocation density behind the shock front depend on strain rate. We find excellent agreement with recent experimental results on strength and recovered microstructure, which goes from dislocations to a mixture of dislocations and twins, to twinning dominated response, as the shock pressure increases. © 2013 Elsevier B.V.

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