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Atomic and Laser Physics
Credit: Jack Hobhouse

Professor Steven Rose

Visiting Professor

Research theme

  • Lasers and high energy density science

Sub department

  • Atomic and Laser Physics

Research groups

  • Oxford Centre for High Energy Density Science (OxCHEDS)
Steven.Rose@physics.ox.ac.uk
Imperial College London webpage
  • About
  • Publications

X-ray-line coincidence photopumping in a potassium-chlorine mixed plasma

Physical Review A American Physical Society 101:5 (2020) 53431

Authors:

LMR Hobbs, D Burridge, MP Hill, DJ Hoarty, CRD Brown, R Charles, G Cooper, SF James, LA Wilson, W Babbage, PW Hatfield, P Beiersdorfer, J Nilsen, H Scott, Sj Rose

Abstract:

Exploiting the multiple long pulse capability and suite of x-ray diagnostics of the Orion laser, we have set out to explore line coincidence photopuming—the enhancement in population of an atomic level brought on by resonant absorption of x rays from a different emitting ion. Unlike previous work, the two ions are in the same plasma and so the experiment is an x-ray analog of the well-known Bowen resonance fluorescence mechanism that operates in astrophysical situations in the optical region. Our measurements have shown enhanced fluorescence in a chlorine plasma, attributable to line coincident photopumping from co-mixed potassium ions. To detect this relatively low signal-to-noise phenomenon, the data from multiple shots are combined, and the statistical method of bootstrapping is used to assign a confidence value to the measured enhancement, resulting in an estimate of the enhancement of 39 ± 16 18% compared to the null case, where no pumping occurs. The experimental results have been compared to coupled radiation-transport and radiation hydrodynamics simulations using the cretin code together with the nym radiation hydrodynamics model and agreement has been found, with the simulations also predicting modest enhancement.
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Potential of prompt γ-ray emission studies in fast-neutron induced fission: a first step

The European Physical Journal A Springer Nature 56:3 (2020) 98

Authors:

L Qi, C Schmitt, M Lebois, A Oberstedt, S Oberstedt, JN Wilson, A Al-Adili, A Chatillon, D Choudhury, A Gatera, G Georgiev, A Göök, B Laurent, A Maj, I Matea, SJ Rose, B Wasilewska, F Zeiser
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Enhanced Fluorescence from X-Ray Line Coincidence Pumping

Chapter in X-Ray Lasers 2018, Springer Nature 241 (2020) 29-35

Authors:

J Nilsen, D Burridge, LMR Hobbs, D Hoarty, P Beiersdorfer, GV Brown, N Hell, D Panchenko, MF Gu, AM Saunders, HA Scott, P Hatfield, MP Hill, L Wilson, R Charles, CRD Brown, S Rose
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Single-Shot Multi-keV X-Ray Absorption Spectroscopy Using an Ultrashort Laser-Wakefield Accelerator Source

Physical Review Letters American Physical Society (APS) 123:25 (2019) 254801

Authors:

B Kettle, E Gerstmayr, MJV Streeter, F Albert, RA Baggott, N Bourgeois, JM Cole, S Dann, K Falk, I Gallardo González, AE Hussein, N Lemos, NC Lopes, O Lundh, Y Ma, SJ Rose, C Spindloe, DR Symes, M Šmíd, AGR Thomas, R Watt, SPD Mangles
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An investigation of the L-shell X-ray conversion efficiency for laser-irradiated tin foils

Plasma Science and Technology IOP Publishing (2019)

Authors:

David Bailie, Cormac Hyland, R Singh, S White, G Sarri, F Keenan, D Riley, S Rose, E Hill, Feilu Wang, Dawei Yuan, Gang Zhao, Huigang Wei, Bo Han, Baoqiang Zhu, Jianqiang Zhu, Pengqian Yang
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