Imperial College London
Alternate

Professor Roland A Smith

Faculty of Natural Sciences, Department of Physics

Professor of Laser Physics
 
 
 
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Contact

 

+44 (0)20 7594 7866r.a.smith Website

 
 
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Location

 

745Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Robinson:2018:epjconf/201816703007,
author = {Robinson, T and Giltrap, S and Eardley, S and Consoli, F and De, Angelis R and Ingenito, F and Stuart, N and Verona, C and Smith, RA},
doi = {epjconf/201816703007},
journal = {EPJ Web of Conferences},
title = {Electro-optic analysis of the influence of target geometry on electromagnetic pulses generated by petawatt laser-matter interactions},
url = {http://dx.doi.org/10.1051/epjconf/201816703007},
volume = {167},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present an analysis of strong laser-driven electromagnetic pulses using novel electro-optic diagnostic techniques. A range of targets were considered, including thin plastic foils (20-550 nm) and mass-limited, optically-levitated micro-targets. Results from foils indicate a dependence of EMP on target thickness, with larger peak electric fields observed with thinner targets. Spectral analysis suggests high repeatability between shots, with identified spectral features consistently detected with <1 MHz standard deviations of the peak position. This deviation is reduced for shots taken on the same day, suggesting that local conditions, such as movement of metal objects within the target chamber, are more likely to lead to minor spectral modifications, highlighting the role of the local environment in determining the details of EMP production. Levitated targets are electrically isolated from their environment, hence these targets should be unable to draw a neutralization current from the earth following ejection of hot electrons from the plasma, in contrast to predictions for pin-mounted foils in the Poyé EMP generation model. With levitated targets, no EMP was measurable above the noise threshold of any diagnostic, despite observation of protons accelerated to >30 MeV energies, suggesting the discharge current contribution to EMP is dominant.
AU  - Robinson,T
AU  - Giltrap,S
AU  - Eardley,S
AU  - Consoli,F
AU  - De,Angelis R
AU  - Ingenito,F
AU  - Stuart,N
AU  - Verona,C
AU  - Smith,RA
DO  - epjconf/201816703007
PY  - 2018///
SN  - 2100-014X
TI  - Electro-optic analysis of the influence of target geometry on electromagnetic pulses generated by petawatt laser-matter interactions
T2  - EPJ Web of Conferences
UR  - http://dx.doi.org/10.1051/epjconf/201816703007
UR  - http://hdl.handle.net/10044/1/54471
VL  - 167
ER  -
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