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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

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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Ionization states for the multi-petawatt laser-QED regime

(2021)

Authors:

I Ouatu, BT Spiers, R Aboushelbaya, Q Feng, MW Mayr, RW Paddock, R Timmis, C Ticos, KM Krushelnick, PA Norreys
More details from the publisher

Time-resolved Measurement of Power Transfer in Plasma Amplifier Experiments on NIF

2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings (2021)

Authors:

PL Poole, RK Kirkwood, SC Wilks, TD Chapman, D Kalantar, M Edwards, P Michel, L DIvol, J Bude, BE Blue, KB Fournier, BM Van Wonterghem, N Fisch, P Norreys, W Rozmus

Abstract:

Beam combination via an ion wave plasma optic is discussed, including measurement of the power transfer (pump depletion and seed amplification) for several seed pulse durations and total pump energies, with accompanying simulation studies.

Methods for Extremely Sparse-Angle Proton Tomography

(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
More details from the publisher

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