ORCID Profile
0000-0002-5493-3434
Current Organisation
University of York
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Publisher: Elsevier BV
Date: 11-2018
Publisher: Hindawi Limited
Date: 22-12-2016
DOI: 10.1017/S0263034616000811
Abstract: The energy spectra of protons generated by ultra-intense (10 20 W cm −2 ) laser interactions with a preformed plasma of scale length measured by shadowgraphy are presented. The effects of the preformed plasma on the proton beam temperature and the number of protons are evaluated. Two-dimensional EPOCH particle-in-cell code simulations of the proton spectra are found to be in agreement with measurements over a range of experimental parameters.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2011
Publisher: Springer Science and Business Media LLC
Date: 12-2010
Publisher: SPIE
Date: 20-08-2009
DOI: 10.1117/12.825057
Publisher: AIP Publishing
Date: 04-2014
DOI: 10.1063/1.4870633
Abstract: Hot electron generation plays an important role in the fast ignition approach to inertial confinement fusion (ICF) and other applications with ultra-intense lasers. Hot electrons of temperature up to 10–20 MeV have been produced by high contrast picosecond duration laser pulses focussed to intensities of ∼1020 W cm−2 with a deliberate pre-pulse on solid targets using the Vulcan Petawatt Laser facility. We present measurements of the number and temperature of hot electrons obtained using an electron spectrometer. The results are correlated to the density scale length of the plasma produced by a controlled pre-pulse measured using an optical probe diagnostic. 1D simulations predict electron temperature variations with plasma density scale length in agreement with the experiment at shorter plasma scale lengths (& .5μm), but with the experimental temperatures (13–17 MeV) dropping below the simulation values (20–25 MeV) at longer scale lengths. The experimental results show that longer interaction plasmas produced by pre-pulses enable significantly greater number of hot electrons to be produced.
Publisher: Elsevier BV
Date: 03-2011
Publisher: AIP Publishing
Date: 10-2011
DOI: 10.1063/1.3649923
Abstract: We model x-ray free-electron laser (XFEL) interactions of pulses of 100 fs duration or less with thick (many attenuation lengths) solid iron targets assuming the instantaneous target opacity is determined solely by the energy absorbed for a given photon energy. Ex les of the bound-free opacity dependence on energy absorbed for iron targets at photon energies of 750–2000 eV are presented. This is utilized to model XFEL pulse propagation through solid iron and to predict the resulting iron plasma opacity as the pulse progresses. Assuming the establishment of local thermodynamic equilibrium and electron-ion thermalization after a sufficiently long time interval, we calculate the temperature profiles to be expected in solid iron targets.
Publisher: AIP Publishing
Date: 2011
DOI: 10.1063/1.3546031
Publisher: Elsevier BV
Date: 06-2011
Publisher: SPIE
Date: 09-09-2019
DOI: 10.1117/12.2528736
Publisher: Springer International Publishing
Date: 2020
Publisher: AIP Publishing
Date: 28-02-2014
DOI: 10.1063/1.4865227
Abstract: X-ray emission from hollow ions offers new diagnostic opportunities for dense, strongly coupled plasma. We present extended modeling of the x-ray emission spectrum reported by Colgan et al. [Phys. Rev. Lett. 110, 125001 (2013)] based on two collisional-radiative codes: the hybrid-structure Spectroscopic Collisional-Radiative Atomic Model (SCRAM) and the mixed-unresolved transition arrays (MUTA) ATOMIC model. We show that both accuracy and completeness in the modeled energy level structure are critical for reliable diagnostics, investigate how emission changes with different treatments of ionization potential depression, and discuss two approaches to handling the extensive structure required for hollow-ion models with many multiply excited configurations.
Publisher: The Optical Society
Date: 09-11-2010
DOI: 10.1364/OL.35.003820
Publisher: SPIE
Date: 08-07-2021
DOI: 10.1117/12.2593349
Publisher: AIP Publishing
Date: 04-2011
DOI: 10.1063/1.3577571
Publisher: American Physical Society (APS)
Date: 06-04-2016
Location: United Kingdom of Great Britain and Northern Ireland
Location: Germany
No related grants have been discovered for Erik Wagenaars.