Skip to main content
Home
Department Of Physics text logo
  • Research
    • Our research
    • Our research groups
    • Our research in action
    • Research funding support
    • Summer internships for undergraduates
  • Study
    • Undergraduates
    • Postgraduates
  • Engage
    • For alumni
    • For business
    • For schools
    • For the public
Menu
Atomic and Laser Physics
Credit: Jack Hobhouse

Dr Ramy Aboushelbaya

Postdoctoral Research Assistant in Extreme Intensity Laser-Plasma Interaction Physics

Sub department

  • Atomic and Laser Physics

Research groups

  • Laser fusion and extreme field physics
ramy.aboushelbaya@physics.ox.ac.uk
Clarendon Laboratory, room Old Library
  • About
  • Publications

Preparations for a European R&D roadmap for an inertial fusion demo reactor

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences The Royal Society 379 (2020) 20200005

Authors:

Peter Norreys, Luke Ceurvorst, James Sadler, Benjamin Spiers, Ramy Aboushelbaya, Marko Mayr, Robert Paddock, Naren Ratan, Alexander Savin, Kevin Glize, Raoul Trines, Bob Bingham, Matthew Hill, Nathan Sircombe, Peter Allan, Laura Hobbs, Steve James, James Skidmore, J Fyrth, J Luis, Emma Floyd, Colin Brown, Brian Haines, Re Olson, Sa Yi, Ab Zylstra, K Flippo, Pa Bradley, Rr Peterson, Jl Kline, Rj Leeper

Abstract:

A European consortium of 15 laboratories across nine nations have worked together under the EUROFusion Enabling Research grants for the past decade with three principle objectives. These are: (a) investigating obstacles to ignition on megaJoule-class laser facilities; (b) investigating novel alternative approaches to ignition, including basic studies for fast ignition (both electron and ion-driven), auxiliary heating, shock ignition, etc.; and (c) developing technologies that will be required in the future for a fusion reactor. A brief overview of these activities, presented here, along with new calculations relates the concept of auxiliary heating of inertial fusion targets, and provides possible future directions of research and development for the updated European Roadmap that is due at the end of 2020.
More details from the publisher
Details from ORA
More details
More details

Whole-beam self-focusing in fusion-relevant plasma

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences Royal Society 379:2189 (2020) 20200159

Authors:

Benjamin Spiers, Matthew Hill, Colin Brown, Luke Ceurvorst, Naren Ratan, Alexander Savin, P Allan, Emma Floyd, J Fyrth, L Hobbs, S James, J Luis, M Ramsay, Nathan Sircombe, J Skidmore, Ramy Aboushelbaya, Marko Mayr, Robert Paddock, Rhw Wang, Peter Norreys

Abstract:

Fast ignition inertial confinement fusion requires the production of a low-density channel in plasma with density scale-lengths of several hundred microns. The channel assists in the propagation of an ultra-intense laser pulse used to generate fast electrons which form a hot spot on the side of pre-compressed fusion fuel. We present a systematic characterisation of an expanding laser-produced plasma using optical interferometry, benchmarked against three-dimensional hydrodynamic simulations. Magnetic fields associated with channel formation are probed using proton radiography, and compared to magnetic field structures generated in fullscale particle-in-cell simulations. We present observations of long lived, straight channels produced by the Habara-Kodama-Tanaka (HKT) wholebeam self-focusing mechanism, overcoming a critical barrier on the path to realising fast ignition.
More details from the publisher
Details from ORA
More details
More details

Nonlinear wakefields and electron injection in cluster plasma

Physical Review Accelerators and Beams American Physical Society 23 (2020) 093501

Authors:

Marko Mayr, Benjamin Spiers, Ramy Aboushelbaya, Robert Paddock, James Sadler, Charles Sillett, Robin Wang, Karl Krushelnick, Peter Norreys

Abstract:

Laser and beam driven wakefields promise orders of magnitude increases in electric field gradients for particle accelerators for future applications. Key areas to explore include the emittance properties of the generated beams and overcoming the dephasing limit in the plasma. In this paper, the first in-depth study of the self-injection mechanism into wakefield structures from nonhomogeneous cluster plasmas is provided using high-resolution two dimensional particle-in-cell simulations. The clusters which are typical structures caused by ejection of gases from a high-pressure gas jet have a diameter much smaller than the laser wavelength. Conclusive evidence is provided for the underlying mechanism that leads to particle trapping, comparing uniform and cluster plasma cases. The accelerated electron beam properties are found to be tunable by changing the cluster parameters. The mechanism explains enhanced beam charge paired with large transverse momentum and energy which has implications for the betatron x-ray flux. Finally, the impact of clusters on the high-power laser propagation behavior is discussed.
More details from the publisher
Details from ORA
More details
Details from ArXiV

Measuring the orbital angular momentum of high-power laser pulses

Physics of Plasmas AIP Publishing 27:5 (2020) 053107

Authors:

Ramy Aboushelbaya, Kevin Glize, Alexander Savin, Marko Mayr, B Spiers, Robin Wang, N Bourgeois, C Spindloe, Robert Bingham, Peter Norreys

Abstract:

In this article, we showcase the experimental results of methods to produce and characterize orbital angular momentum (OAM) carrying high-power lasers. The OAM pulses were produced on the ASTRA laser of the Central Laser Facility using a continuous spiral phase plate. Three different characterization methods were then used to measure the OAM content of the beam. The methods that were used were a cylindrical lens diagnostic, an interferometric diagnostic, and a projective diagnostic. We further discuss the relative advantages and disadvantages of each method in the context of high-power laser experiments.
More details from the publisher
Details from ORA
More details

Wakefields in a cluster plasma

Physical Review Special Topics: Accelerators and Beams American Physical Society 22:11 (2019) 113501

Authors:

M Mayr, L Ceurvorst, M Kasim, J Sadler, B Spiers, K Glize, A Savin, N Bourgeois, F Keeble, A Ross, D Symes, R Aboushelbaya, R Fonseca, J Holloway, N Ratan, R Trines, R Wang, R Bingham, P Burrows, M Wing, R Pattathil, Peter Norreys

Abstract:

We report the first comprehensive study of large amplitude Langmuir waves in a plasma of nanometer-scale clusters. Using an oblique angle single-shot frequency domain holography diagnostic, the shape of these wakefields is captured for the first time. The wavefronts are observed to curve backwards, in contrast to the forwards curvature of wakefields in uniform plasma. Due to the expansion of the clusters, the first wakefield period is longer than those trailing it. The features of the data are well described by fully relativistic two-dimensional particle-in-cell simulations and by a quasianalytic solution for a one-dimensional, nonlinear wakefield in a cluster plasma.
More details from the publisher
Details from ORA
More details

Pagination

  • First page First
  • Previous page Prev
  • Page 1
  • Page 2
  • Current page 3
  • Page 4
  • Page 5
  • Next page Next
  • Last page Last

Footer Menu

  • Contact us
  • Giving to the Dept of Physics
  • Work with us
  • Media

User account menu

  • Log in

Follow us

FIND US

Clarendon Laboratory,

Parks Road,

Oxford,

OX1 3PU

CONTACT US

Tel: +44(0)1865272200

University of Oxfrod logo Department Of Physics text logo
IOP Juno Champion logo Athena Swan Silver Award logo

© University of Oxford - Department of Physics

Cookies | Privacy policy | Accessibility statement

Built by: Versantus

  • Home
  • Research
  • Study
  • Engage
  • Our people
  • News & Comment
  • Events
  • Our facilities & services
  • About us
  • Current students
  • Staff intranet