Laser-induced ablation: physics and diagnostics of ion emission

• Autorzy: Torrisi L.
• Konferencja: 9th Kudowa Summer School „Towards Fusion Energy”
• Języki publikacji: EN

Abstrakty

EN

Pulsed lasers generating beams of different intensities may be used to produce ablation of solid targets placed in high vacuum and to generate pulsed plasma and ion acceleration. The plasma is in a non-equilibrium condition and in the first instant the particles being generated are subject to thermal interactions, to a supersonic gas expansion in vacuum and to a Coulomb acceleration due to the high electric field developed along the normal to the target surface. The ion diagnostics, based on time-of-flight technique, allow us to measure the mean ion energy, the total number of ions, as well as the ion energy and charge state distributions. The ion energy distributions may be described by the Coulomb- -Boltzmann-Shifted (CBS) function, which after fitting to the experimental data may be used to determine the equivalent ion temperature and the accelerating voltage. Given the equivalent acceleration voltage and the plasma Debye length, it is possible to estimate the magnitude of the electric field developed in the plasma. Measurements of the ablation yield, plasma dimension and optical spectroscopy allow us to calculate the atomic and electronic plasma density and to evaluate the coronal plasma temperature. Some applications of the laser-induced ablation consist in the realization of laser ion sources (LIS), generation of multi-energetic ion beams by using a post-accelerating voltage, use of ultra-intense fs lasers to accelerate ions to energies of the order of tens MeV/nucleon. Other special applications include the pulsed laser deposition (PLD) of thin films, the laser ablation coupled to mass quadrupole spectrometry (LAMQS) probes, ablation of biological tissues, and generation of plasma for astrophysical and nuclear investigations.

Słowa kluczowe

EN

laser-generating plasma; Boltzmann distribution; time-of-flight

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2011
• Tom: Vol. 56, No. 2
• Strony: 113--117
• Opis fizyczny: Bibliogr. 14 poz., rys.

Twórcy

autor

Torrisi L.

• Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare (National Institute for Nuclear Physics), 62 S. Sofia Str., 95123 Catania, Italy, Tel.: [phone], Fax: [phone], E-mail: [e-mail] and Dipartimento di Fisi,

Bibliografia

• 1. Bell AR (1993) Laser plasmas. In: Dendy R (ed) Plasma physics, an introductory course. Cambridge University Press, Cambridge
• 2. Caridi F, Torrisi L, Giuffrida L (2010) Time-of-flight and UV spectroscopy characterization of laser-generated plasma. Nucl Instrum Methods B 268:499–505
• 3. Clark EL, Krushelnich K, Zepf M et al. (2000) Energetic heavy-ion and proton generation from ultraintense laser-plasma interactions with solids. Phys Rev Lett 85;8:1654–1657
• 4. Gammino S, Ciavola G, Torrisi L et al. (2004) Innovative ion sources for accelerators. The benefits of the plasma technology. Czech J Phys 54:Suppl C;C883–C888
• 5. Goldman L (2002) Foreword. In: Waynant RW (ed) Lasers in medicine. CRC Press, London
• 6. Laska L, Krasa J, Velyhan A et al. (2009) Experimental studies of generation of 100 MeV Au-ions from the laser-produced plasma. Laser Part Beams 27:137–147
• 7. Mezzasalma AM, Mondio G, Serafino T, Caridi F, Torrisi L (2009) Electronic properties of thin films of laser-ablated Al2O3. Appl Surf Sci 255:4123–4128
• 8. Torrisi L, Caridi F, Giuffrida L (2010) Comparison of Pd plasmas produced at 532 nm and 1064 nm by a Nd:YAG laser ablation. Nucl Instrum Methods Phys Res B 268:2285–2291
• 9. Torrisi L, Caridi F, Giuffrida L et al. (2010) LAMQS analysis applied to ancient Egyptian bronze coins. Nucl Instrum Methods B 268:1657–1664
• 10. Torrisi L, Cavallaro S, Giuffrida L, Gammino S, Andò L (2010) Ti post-ion acceleration from laser ion source. Radiat Eff Defects Solids: Inc Plasma Sci Plasma Technol 165;6:509–520
• 11. Torrisi L, Gammino S (2006) Method for the calculation of electrical field in laser-generated plasma for ion stream production. Rev Sci Instrum 77:03B7071–03B7074
• 12. Torrisi L, Gammino S, Andò L, Laska L (2002) Tantalum ions production by 1064 nm pulsed laser irradiation. J Appl Phys 91;5:4685–4692
• 13. Torrisi L, Gammino S, Mezzasalma AM et al. (2004) Laser ablation of UHMWPE-polyethylene by 438 nm high energy pulsed laser. Appl Surf Sci 227:164–174
• 14. Woryna E, Parys P, Wołowski J, Mroz W (1996) Corpuscular diagnostics and processing methods applied in investigations of laser-produced plasma as a source of highly ionized ions. Laser Part Beams 14:293–321