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Abstract
Modern chirped pulse amplification laser systems with continuously improving controllability and increasing power are about to reach intensities of up to $10^{22}~\text{W}~\text{cm}^{-2}$ and have proven their potential to accelerate ions out of plasma to several tens percent of the speed of light. For enabling application, one important step is to increase the repetition rate at which ion bunches are at the disposal. In particular, techniques used so far for thin foil target production can require several days of preparing reasonable amounts for a single campaign. In this paper we describe the reasonably droplet method which we have tested and improved so that the emerging foils with thicknesses of a few nanometres up to micrometre can be used as targets for laser ion acceleration. Their quality and performance can compete with so far employed techniques thereby enabling the production of hundreds of targets per day.
Highlights
Acceleration of ions by intense laser pulses[1] relies on using different mechanisms that are distinct in the required target thickness
While measuring foils on a substrate can be investigated optically with confocal and brightfield microscopy, or mechanically with an atomic force microscope (AFM), these methods largely fail for measuring the foils directly on the water surface
We find the well known but rarely employed droplet technique to produce thin films very helpful and efficient for the production of reasonably large quantities of nanometre thin plastic foils
Summary
Acceleration of ions by intense laser pulses[1] relies on using different mechanisms that are distinct in the required target thickness. When restricting our needs to plastic materials, we investigated the droplet method that circumvents floating and shortens the production time significantly, enabling the provision of hundreds of foils per day, and if a constant thickness is required, even in one single process. The plastic is dissolved in a solvent and this solution is dropped directly on a water surface.
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