| Autor: |
Consoli F; ENEA - C.R. Frascati, Fusion and Nuclear Safety Department, Via E. Fermi 45, 00044, Frascati, Italy. fabrizio.consoli@enea.it., De Angelis R; ENEA - C.R. Frascati, Fusion and Nuclear Safety Department, Via E. Fermi 45, 00044, Frascati, Italy., Robinson TS; The Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom., Giltrap S; The Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom., Hicks GS; The Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom., Ditter EJ; The Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom., Ettlinger OC; The Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom., Najmudin Z; The Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom., Notley M; Central Laser Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom., Smith RA; The Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom. |
| Abstrakt: |
We demonstrate here for the first time that charge emitted by laser-target interactions at petawatt peak-powers can be efficiently deposited on a capacitor-collector structure far away from the target and lead to the rapid (tens of nanoseconds) generation of large quasi-static electric fields over wide (tens-of-centimeters scale-length) regions, with intensities much higher than common ElectroMagnetic Pulses (EMPs) generated by the same experiment in the same position. A good agreement was obtained between measurements from a classical field-probe and calculations based on particle-flux measurements from a Thomson spectrometer. Proof-of-principle particle-in-cell simulations reproduced the measurements of field evolution in time, giving a useful insight into the charging process, generation and distribution of fields. The understanding of this charging phenomenon and of the related intense fields, which can reach the MV/m order and in specific configurations might also exceed it, is very important for present and future facilities studying laser-plasma-acceleration and inertial-confinement-fusion, but also for application to the conditioning of accelerated charged-particles, the generation of intense electric and magnetic fields and many other multidisciplinary high-power laser-driven processes. |
