Efficient laser-driven proton and bremsstrahlung generation from cluster-assembled foam targets
oleh: Irene Prencipe, Josefine Metzkes-Ng, Andrea Pazzaglia, Constantin Bernert, David Dellasega, Luca Fedeli, Arianna Formenti, Marco Garten, Thomas Kluge, Stephan Kraft, Alejandro Laso Garcia, Alessandro Maffini, Lieselotte Obst-Huebl, Martin Rehwald, Manfred Sobiella, Karl Zeil, Ulrich Schramm, Thomas E. Cowan, Matteo Passoni
| Format: | Article |
|---|---|
| Diterbitkan: | IOP Publishing 2021-01-01 |
Deskripsi
The interaction between intense 30 fs laser pulses and foam-coated 1.5 μ m-thick Al foils in the relativistic regime (up to 5 × 10 ^20 W cm ^−2 ) is studied to optimize the laser energy conversion into laser-accelerated protons. A significant enhancement is observed for foam targets in terms of proton cut-off energy (18.5 MeV) and number of protons above 4.7 MeV (4 × 10 ^9 protons/shot) with respect to uncoated foils (9.5 MeV, 1 × 10 ^9 protons/shot), together with a sixfold increase in the bremsstrahlung yield. This enhancement is attributed to increased laser absorption and electron generation in the foam meso- and nanostructure.