Ge and Ti post-ion acceleration from laser ion source

Phys. Rev. Accel. Beams

Costa

2019

Self Cite

A compact Thomson parabola spectrometer for diagnostics of laser-generated plasma, projected in Messina University, has been employed in different experiments concerning diagnostics of lasergenerated 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 kV=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.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Compact Thomson parabola spectrometer for fast diagnostics of different intensity laser-generated plasmas

Phys. Rev. Accel. Beams

Costa

2019

Self Cite

“…The maximum Ti charge state is four; this indicates that the plasma electron temperature ranges between the fourth and fifth ionization potentials of Ti which are of 43 eV and 99 eV, respectively. Ions are extracted by the ablation chamber and submitted to a post acceleration of 30 kV, as reported in a previous paper [15], thus a multi energetic ion beams is generated where, for example, protons are accelerated monochromatically at 30 keV and Ti at the energies of 30 keV, 60 keV, 90 keV and 120 keV, proportionally to their charge state, respectively. The PALS-TPS uses a magnetic field of 0.1 T, an electric field of 2.0 kV/cm and has the following parameters: L B = L E = 8 cm, l=0, D=16.5cm, which geometry is reported in literature.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

Magnetic and electric deflector spectrometers for ion emission analysis from laser generated plasma

Costa

Ceccio

et al. 2018

EPJ Web of Conferences

Abstract. The pulsed laser-generated plasma in vacuum and at low and high intensities can be characterized using different physical diagnostics. The charge particles emission can be characterized using magnetic, electric and magnet-electrical spectrometers. Such on-line techniques are often based on time-of-flight (TOF) measurements. A 90° electric deflection system is employed as ion energy analyzer (IEA) acting as a filter of the mass-to-charge ratio of emitted ions towards a secondary electron multiplier. It determines the ion energy and charge state distributions. The measure of the ion and electron currents as a function of the mass-to-charge ratio can be also determined by a magnetic deflector spectrometer, using a magnetic field of the order of 0.35 T, orthogonal to the ion incident direction, and an array of little ion collectors (IC) at different angles. A Thomson parabola spectrometer, employing gaf-chromix as detector, permits to be employed for ion mass, energy and charge state recognition. Mass quadrupole spectrometry, based on radiofrequency electric field oscillations, can be employed to characterize the plasma ion emission. Measurements performed on plasma produced by different lasers, irradiation conditions and targets are presented and discussed. Complementary measurements, based on mass and optical spectroscopy, semiconductor detectors, fast CCD camera and Langmuir probes are also employed for the full plasma characterization. Simulation programs, such as SRIM, SREM, and COMSOL are employed for the charge particle recognition.

2.5‐MeV neutron source controlled by high‐intensity pulsed laser generating plasma

Contributions to Plasma Physics

2021

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A laptop neutron source suited for the most demanding field or laboratory applications is presented. It is based on laser ablation of CD 2 primary targets, plasma acceleration of the D + ions, and their irradiation of secondary CD 2 targets. The deuterium-deuterium (D-D) fusion reaction is induced in the secondary target, according to the values of fusion cross-section versus deuteron energy, which show a significant probability also at relatively low ion energies. The experiments were completed in the PALS laboratory, Prague, detecting monoenergetic neutrons at 2.45 MeV with an emission flux of about 10 9 neutrons per laser shot.Other experiments demonstrating the possibility to induce D-D events were performed at IPPLM, Warsaw, and at INFN-LNS, Catania, where the deuterons were accelerated at about 4 MeV and 50 keV, respectively. In the last case, a low laser intensity and a post-ion acceleration system were employed. A special interaction chamber, under vacuum, is proposed to develop a new source of monochromatic neutrons or thermalized distribution of neutrons K E Y W O R D SD-D fusion reaction, laser-generated plasma, neutron source, post ion acceleration, TNSA