Publications by Steven Rose

Free Electron Relativistic Correction Factors to Collisional Excitation and Ionisation Rates in a Plasma

High Energy Density Physics Elsevier BV (2019) 100716

JJ Beesley, SJ Rose

Observation of He-like Satellite Lines of the H-like Potassium K XIX Emission


ME Weller, P Beiersdorfer, TE Lockard, GV Brown, A McKelvey, J Nilsen, R Shepherd, VA Soukhanovskii, MP Hill, LMR Hobbs, D Burridge, DJ Hoarty, J Morton, L Wilson, SJ Rose, P Hatfield

Using Sparse Gaussian Processes for Predicting Robust Inertial Confinement Fusion Implosion Yields

IEEE Transactions on Plasma Science Institute of Electrical and Electronics Engineers (IEEE) (2019) 1-8

P Hatfield, S Rose, R Scott, I Almosallam, S Roberts, M Jarvis

Laboratory measurements of geometrical effects in the x-ray emission of optically thick lines for ICF diagnostics

PHYSICS OF PLASMAS 26 (2019) ARTN 063302

G Perez-Callejo, LC Jarrott, DA Liedahl, EV Marley, GE Kemp, RF Heeter, JA Emig, ME Foord, K Widmann, J Jaquez, H Huang, SJ Rose, JS Wark, MB Schneider

Radiation transfer in cylindrical, toroidal and hemi-ellipsoidal plasmas

Journal of Quantitative Spectroscopy and Radiative Transfer Elsevier BV (2019)

G Pérez-Callejo, JS Wark, SJ Rose

The use of geometric effects in diagnosing ion density in ICF-related dot spectroscopy experiments


G Perez-Callejo, DA Liedahl, MB Schneider, SJ Rose, JS Wark

Enhanced fluorescence from x-ray line coincidence pumping of K-pumped Cl and Mg-pumped Ge plasmas

X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XIII SPIE (2019)

J Nilsen, D Burridge, LMR Hobbs, D Hoarty, P Beiersdorfer, GV Brown, N Hell, D Panchenko, MF Gu, AM Saunders, HA Scott, RA London, P Hatfield, MP Hill, L Wilson, R Charles, CRD Brown, S Rose

A proposal to measure iron opacity at conditions close to the solar convective zone-radiative zone boundary

High Energy Density Physics Elsevier BV (2019)

DJ Hoarty, J Morton, M Jeffery, LK Pattison, A Wardlow, SPD Mangles, SJ Rose, C Iglesias, K Opachich, RF Heeter, TS Perry

The blind implosion-maker: Automated inertial confinement fusion experiment design

PHYSICS OF PLASMAS 26 (2019) ARTN 062706

PW Hatfield, SJ Rose, RHH Scott

Observing thermal Schwinger pair production

Physical Review A American Physical Society (APS) 99 (2019) 052120

O Gould, S Mangles, A Rajantie, S Rose, C Xie

ALICE: A non-LTE plasma atomic physics, kinetics and lineshape package


EG Hill, G Perez-Callejo, SJ Rose

Ultrafast Imaging of Laser Driven Shock Waves using Betatron X-rays from a Laser Wakefield Accelerator.

Scientific reports 8 (2018) 11010-

JC Wood, DJ Chapman, K Poder, NC Lopes, ME Rutherford, TG White, F Albert, KT Behm, N Booth, JSJ Bryant, PS Foster, S Glenzer, E Hill, K Krushelnick, Z Najmudin, BB Pollock, S Rose, W Schumaker, RHH Scott, M Sherlock, AGR Thomas, Z Zhao, DE Eakins, SPD Mangles

Betatron radiation from laser wakefield accelerators is an ultrashort pulsed source of hard, synchrotron-like x-ray radiation. It emanates from a centimetre scale plasma accelerator producing GeV level electron beams. In recent years betatron radiation has been developed as a unique source capable of producing high resolution x-ray images in compact geometries. However, until now, the short pulse nature of this radiation has not been exploited. This report details the first experiment to utilize betatron radiation to image a rapidly evolving phenomenon by using it to radiograph a laser driven shock wave in a silicon target. The spatial resolution of the image is comparable to what has been achieved in similar experiments at conventional synchrotron light sources. The intrinsic temporal resolution of betatron radiation is below 100 fs, indicating that significantly faster processes could be probed in future without compromising spatial resolution. Quantitative measurements of the shock velocity and material density were made from the radiographs recorded during shock compression and were consistent with the established shock response of silicon, as determined with traditional velocimetry approaches. This suggests that future compact betatron imaging beamlines could be useful in the imaging and diagnosis of high-energy-density physics experiments.

Laser-driven strong magnetostatic fields with applications to charged beam transport and magnetized high energy-density physics

Physics of Plasmas American Institute of Physics (2018)

SJ Rose, JJ Santos, M Bailly-Grandvaux, M Ehret, AV Arefiev, D Batani, FN Beg, A Calisti, S Ferri, R Florido, P Forestier-Colleoni, S Fujioka, MA Gigosos, L Giuffrida, L Gremillet, JJ Honrubia, S Kojima, P Korneev, KFF Law, J-R Marques, A Morace, C Mosse, O Peyrusse, M Roth, S Sakata, F Suzuki-Vidal, VT Tikhonchuk, T Toncian, N Woolsey, Z Zhang

Production of photoionized plasmas in the laboratory with x-ray line radiation.

Physical review. E 97 (2018) 063203-

S White, R Irwin, JR Warwick, GF Gribakin, G Sarri, FP Keenan, D Riley, SJ Rose, EG Hill, GJ Ferland, B Han, F Wang, G Zhao

In this paper we report the experimental implementation of a theoretically proposed technique for creating a photoionized plasma in the laboratory using x-ray line radiation. Using a Sn laser plasma to irradiate an Ar gas target, the photoionization parameter, ξ=4πF/N_{e}, reached values of order 50ergcms^{-1}, where F is the radiation flux in ergcm^{-2}s^{-1}. The significance of this is that this technique allows us to mimic effective spectral radiation temperatures in excess of 1 keV. We show that our plasma starts to be collisionally dominated before the peak of the x-ray drive. However, the technique is extendable to higher-energy laser systems to create plasmas with parameters relevant to benchmarking codes used to model astrophysical objects.

X-ray line coincidence photopumping in a solar flare

Monthly Notices of the Royal Astronomical Society Blackwell Publishing Inc. (2017)

SJ Rose

Modelling K shell spectra from short pulse heated buried microdot targets


DJ Hoarty, N Sircombe, P Beiersdorfer, CRD Brown, MP Hill, LMR Hobbs, SF James, J Morton, E Hill, M Jeffery, JWO Harris, R Shepherd, E Marley, E Magee, J Emig, J Nilsen, HK Chung, RW Lee, SJ Rose

Measurements of plasma spectra from hot dense elements and mixtures at conditions relevant to the solar radiative zone.


DJ Hoarty, E Hill, P Beiersdorfer, P Allan, CRD Brown, MP Hill, LMR Hobbs, SF James, J Morton, N Sircombe, L Upcraft, JWO Harris, R Shepherd, E Marley, E Magee, J Emig, J Nilsen, SJ Rose

Efficient evaluation of collisional energy transfer terms for plasma particle simulations


AE Turrell, M Sherlock, SJ Rose

Transport coefficients of a relativistic plasma.

Physical review. E 93 (2016) 053208-

OJ Pike, SJ Rose

In this work, a self-consistent transport theory for a relativistic plasma is developed. Using the notation of Braginskii [S. I. Braginskii, in Reviews of Plasma Physics, edited by M. A. Leontovich (Consultants Bureau, New York, 1965), Vol. 1, p. 174], we provide semianalytical forms of the electrical resistivity, thermoelectric, and thermal conductivity tensors for a Lorentzian plasma in a magnetic field. This treatment is then generalized to plasmas with arbitrary atomic number by numerically solving the linearized Boltzmann equation. The corresponding transport coefficients are fitted by rational functions in order to make them suitable for use in radiation-hydrodynamic simulations and transport calculations. Within the confines of linear transport theory and on the assumption that the plasma is optically thin, our results are valid for temperatures up to a few MeV. By contrast, classical transport theory begins to incur significant errors above k_{B}T∼10 keV, e.g., the parallel thermal conductivity is suppressed by 15% at k_{B}T=20 keV due to relativistic effects.

Ultrafast collisional ion heating by electrostatic shocks.

Nature communications 6 (2015) 8905-

AE Turrell, M Sherlock, SJ Rose

High-intensity lasers can be used to generate shockwaves, which have found applications in nuclear fusion, proton imaging, cancer therapies and materials science. Collisionless electrostatic shocks are one type of shockwave widely studied for applications involving ion acceleration. Here we show a novel mechanism for collisionless electrostatic shocks to heat small amounts of solid density matter to temperatures of ∼keV in tens of femtoseconds. Unusually, electrons play no direct role in the heating and it is the ions that determine the heating rate. Ions are heated due to an interplay between the electric field of the shock, the local density increase during the passage of the shock and collisions between different species of ion. In simulations, these factors combine to produce rapid, localized heating of the lighter ion species. Although the heated volume is modest, this would be one of the fastest heating mechanisms discovered if demonstrated in the laboratory.