Abstract
Abstract Microstructured targets demonstrate an enhanced coupling of high-intensity laser pulse to a target and play an important role in laser-induced ion acceleration. Here we demonstrate an approach that enables us to control the morphology of amorphous solid water (ASW) microstructured targets, by deposition of water vapor on a charged substrate, cooled down to 100 K. The morphology of the deposited ASW structures is controlled by varying the surface charge on the substrate and the pressure of water vapor. The obtained target is structured as multiple, dense spikes, confined by the charged area on the substrate, with increased aspect ratio of up to 5:1 and having a diameter comparable with the typical spot size of the laser focused onto the target.
Highlights
Interaction of high-intensity laser pulses with matter is attractive owing to the wide field of applications, such as secondary light sources, X-ray or gamma generation[1,2], electron[3], and ion[4,5] acceleration
Deposition of water vapor on a charged amorphous solid water (ASW) surface showed a variety of growth kinetics, resulting in well-separated features and increased aspect ratio
ASW targets can be deposited with a wide range of aspect ratio of pillars from 1.7 to 5.1 and varying grain morphology, averaged over four to five depositions under the same experimental conditions
Summary
Interaction of high-intensity laser pulses with matter is attractive owing to the wide field of applications, such as secondary light sources, X-ray or gamma generation[1,2], electron[3], and ion[4,5] acceleration. A promising ion acceleration scheme is one whereby a high-intensity laser interacts with a structured dynamic plasma target[13]. In this mechanism the laser pulse interacts with microstructured ice targets, sometimes plainly referred to as “snow,” deposited on a sapphire substrate[14]. Such an interaction is assumed to benefit from the localized enhancement of the laser electrical
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