Abstract
In a recent experimental campaign, we used laser-accelerated relativistic hot electrons to ensure heating of thin titanium wire targets up to a warm dense matter (WDM) state [EPL114, 45002 (2016)10.1209/0295-5075/114/45002]. The WDM temperature profiles along several hundred microns of the wire were inferred by using spatially resolved X-ray emission spectroscopy looking at the Ti Kα characteristic lines. A maximum temperature of ∼30 eV was reached. Our study extends this work by discussing the influence of the laser parameters on temperature profiles and the optimisation of WDM wire-based generation. The depth of wire heating may reach several hundreds of microns and it is proven to be strictly dependent on the laser intensity. At the same time, it is quantitatively demonstrated that the maximum WDM temperature doesn't appear to be sensitive to the laser intensity and mainly depends on the deposited laser energy considering ranges of 6×1018-6×1020 W/cm2 and 50-200 J.
Highlights
Warm dense matter (WDM) studies [1] are currently receiving increasing attention being important for various Ąelds of science such as astrophysics, physics of plasmas and thermonuclear fusion [2Ű7]
hot electrons (HE) energy spectrum can be roughly described by a Maxwellian distribution with a characteristic temperature Thot [67], which may be estimated according to the laser intensity value using a semi-empirical scaling law
We experimentally studied the inĆuence of laser pulse parameters on temperature proĄles of warm dense matter (WDM) generated in a titanium wire heated by a laser-accelerated hot-electron current
Summary
Warm dense matter (WDM) studies [1] are currently receiving increasing attention being important for various Ąelds of science such as astrophysics, physics of plasmas and thermonuclear fusion [2Ű7]. WDM is usually deĄned as matter with density and temperature of about 0.1Ű100 g/cm and 1Ű100 eV, respectively. Over-dense WDM is created in laboratories by compression and heating of matter by shock waves, as has been demonstrated in various experiments on high-power lasers [8Ű11] or even combined with diamond anvils [12,13]. Fast isochoric heating of solid matter may ensure obtaining a near-solid-density WDM. Such experiments can be performed with XFEL [14,15], optical lasers [16Ű19], accelerated particle beams [20Ű25] and laser wakeĄeld [26Ű29]. Isochoric heating of solid-state foils by optical laser pulses is a well-established way for producing WDM [30Ű34], recently alternative target types have been successfully employed as well [35Ű41]
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