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Atomic and Laser Physics
Credit: Jack Hobhouse

Prof Peter Norreys FInstP;

Professorial Research Fellow

Research theme

  • Accelerator physics
  • Lasers and high energy density science
  • Fundamental particles and interactions
  • Plasma physics

Sub department

  • Atomic and Laser Physics

Research groups

  • Oxford Centre for High Energy Density Science (OxCHEDS)
peter.norreys@physics.ox.ac.uk
Telephone: 01865 (2)72220
Clarendon Laboratory, room 141.1
Peter Norreys' research group
  • About
  • Research
  • Teaching
  • Publications

Suprathermal electrons from the anti-Stokes Langmuir decay instability cascade

Physical Review E American Physical Society 105:4 (2022) 045208

Authors:

QS Feng, R Aboushelbaya, MW von der Leyen, BT Spiers, RW Paddock, I Ouatu, R Timmis, RHW Wang, LH Cao, ZJ Liu, CY Zheng, XT He, PA Norreys

Abstract:

The study of parametric instabilities has played a crucial role in understanding energy transfer to plasma and, with that, the development of key applications such as inertial confinement fusion. When the densities are between 0.11n_{c}≲n_{e}≲0.14n_{c} and the electron temperature is in inertial confinement fusion-relevant temperatures, anomalous hot electrons with kinetic energies above 100keV are generated. Here a new electron acceleration mechanism-the anti-Stokes Langmuir decay instability cascade of forward stimulated Raman scattering-is investigated. This mechanism potentially explains anomalous energetic electron generation in indirectly driven inertial confinement fusion experiments, it also provides a new way of accelerating electrons to higher energy for applications such as novel x-ray sources.
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Efficient generation of new orbital angular momentum beams by backward and forward stimulated Raman scattering

(2022)

Authors:

QS Feng, R Aboushelbaya, MW Mayr, WP Wang, RMGM Trines, BT Spiers, RW Paddock, I Ouatu, R Timmis, RHW Wang, R Bingham, PA Norreys
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Efficient Location-Based Tracking for IoT Devices Using Compressive Sensing and Machine Learning Techniques

Chapter in High-Dimensional Optimization and Probability, Springer Nature 191 (2022) 373-393

Authors:

Ramy Aboushelbaya, Taimir Aguacil, Qiuting Huang, Peter A Norreys
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Methods for Extremely Sparse-Angle Proton Tomography

Physical Review E: Statistical, Nonlinear, and Soft Matter Physics American Physical Society (2021)

Authors:

Ben T Spiers, Ramy Aboushelbaya, Qingsong Feng, Marko W Mayr, Iustin Ouatu, Robert W Paddock, Robin Timmis, Robin HW Wang, Peter A Norreys

Abstract:

Proton radiography is a widely-fielded diagnostic used to measure magnetic structures in plasma. The deflection of protons with multi-MeV kinetic energy by the magnetic fields is used to infer their path-integrated field strength. Here, the use of tomographic methods is proposed for the first time to lift the degeneracy inherent in these path-integrated measurements, allowing full reconstruction of spatially resolved magnetic field structures in three dimensions. Two techniques are proposed which improve the performance of tomographic reconstruction algorithms in cases with severely limited numbers of available probe beams, as is the case in laser-plasma interaction experiments where the probes are created by short, high-power laser pulse irradiation of secondary foil targets. The methods are equally applicable to optical probes such as shadowgraphy and interferometry [M. Kasim et al. Phys. Rev. E 95, 023306 (2017)], thereby providing a disruptive new approach to three dimensional imaging across the physical sciences and engineering disciplines.
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Methods for extremely sparse-angle proton tomography

PHYSICAL REVIEW E American Physical Society (APS) 104:4 (2021) 45201

Authors:

Bt Spiers, R Aboushelbaya, Q Feng, Mw Mayr, I Ouatu, Rw Paddock, R Timmis, Rh-W Wang, Pa Norreys

Abstract:

Proton radiography is a widely fielded diagnostic used to measure magnetic structures in plasma. The deflection of protons with multi-MeV kinetic energy by the magnetic fields is used to infer their path-integrated field strength. Here the use of tomographic methods is proposed for the first time to lift the degeneracy inherent in these path-integrated measurements, allowing full reconstruction of spatially resolved magnetic field structures in three dimensions. Two techniques are proposed which improve the performance of tomographic reconstruction algorithms in cases with severely limited numbers of available probe beams, as is the case in laser-plasma interaction experiments where the probes are created by short, high-power laser pulse irradiation of secondary foil targets. A new configuration allowing production of more proton beams from a single short laser pulse is also presented and proposed for use in tandem with these analytical advancements.
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