Abstract
A compact Thomson parabola spectrometer for diagnostics of laser-generated plasma, projected in Messina University, has been employed in different experiments concerning diagnostics of laser-generated plasmas. It allows to detect charged particles emitted from hot laser plasma and fast analyzing of their charge state, kinetic energy and mass-to-charge ratio. Moreover, it is possible to detect electrons emitted from laser-generated plasma. The spectrometer consists of a double pinhole input for alignment direction, a permanent magnet (0.004-4 kG) and an electric field ($0.05--5\text{ }\text{ }\mathrm{kV}/\mathrm{cm}$) both orthogonal to the direction of the incident particles, and different type of planar detectors (multichannel plates, phosphorous screen, gafchromic, CR39 and PM 355 track detectors). Measurements have been acquired at MIFT in Messina observing electrons up to 10 keV kinetic energy, at INFN-LNS of Catania using ions emitted from plasma submitted to a postacceleration up to 30 kV per charge state and at PALS Laboratory in Prague detecting energetic ions above 1 MeV per charge state. The particles recognition using the Thomson spectrometer has been obtained comparing the experimental parabola curves with the theoretical simulations obtained using COMSOL software. Results will be presented and discussed.
Highlights
Ion streams generated by laser induced plasmas, with an energy of the order of keV–MeV, can be detected using different devices such as Faraday cups, semiconductor detectors, gafchromic films, track detectors, and others
These results indicate that the plasma ion acceleration is of about 106 eV per charge state and that the maximum charge states of the O and Ti ions are 4þ
The arrival time of the ions decreases significantly because ions are postaccelerated to 30 keV per charge state
Summary
Ion streams generated by laser induced plasmas, with an energy of the order of keV–MeV, can be detected using different devices such as Faraday cups, semiconductor detectors, gafchromic films, track detectors, and others. A high-intensity laser hitting a target causes a plasma production with the expulsion of high-energy electrons, ions and photons, with angular emission narrow for the particles and large for the photons. The backward plasma acceleration (BPA) in thick targets occurs, while at high intensities the target normal sheath acceleration (TNSA) from thin targets can occur [3].
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