Sep 15 – 21, 2019
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

Evolution of relativistic transparency in nanometer-scale targets

Sep 19, 2019, 4:40 PM
SBIO (Hotel Biodola)


Hotel Biodola

talk WG2 - Ion beams from plasmas WG2


Emma-Jane Ditter (Imperial College London)


When a multi-terawatt laser pulse is incident onto a nanometer-scale target, strong electron heating and plasma expansion occurs. As the plasma expands, the target experiences a change in electron density which affects the type of interaction occurring. Of particular interest is the regime of relativistic transparency, when the target density drops below the relativistic critical density, $\gamma n_{crit}$, and laser light is able to penetrate and transmit through the target.
When a 45$\,$fs terawatt laser pulse with $a_{0}$ of 12.5 is incident onto a nanometer scale target, information on the plasma dynamics can be obtained from the optical diagnostics. In particular, the percentage of reflected and transmitted light as well as their spatial profiles is shown to be a good indication of electron density and target heating. Supporting simulations show rate of electron heating varying from 0.1 – 1.7 MeV for different polarisations and targets in the range of 2-100nm. A strong correlation with plasma expansion is also seen. These results will be discussed and will be presented alongside analytical expectations.

Primary authors

Emma-Jane Ditter (Imperial College London) George Hicks (Imperial College London) Oliver Ettlinger (Imperial College London) Aodhan McIlvenny (Queen's University of Belfast) Domenico DORIA (ELI-NP, HH-IFIN, QUB) Domenico Doria (Queens University of Belfast) Marco Borghesi (Queen's University Belfast) Zulfikar Najmudin (Imperial College London) Dr Hamad Ahmed (Queen's University Belfast) Paul McKenna (University of Strathclyde) Dr Philip Martin (Queen's University Belfast) Dr Samuel Williamson (University of Strathclyde) Dr Lorenzo Romagnani (Ecole Polytechnique) Dr Nicola Booth (CLF)

Presentation materials