Browsing by Author "Veloso Espinosa, Felipe"
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- ItemComparative study on the dynamics and the composition between a pulsed laser deposition (PLD) and a plasma enhanced PLD (PE-PLD)(2021) Escalona, M.; Bhuyan, H.; Valenzuela, J.C.; Ibacache, S.; Wyndham, E.; Favre, M.; Veloso Espinosa, Felipe; Ruiz, H.M.; Wagenaars, E.
- ItemComparison between laser initiated hollow gas embedded z-pinches with different initial radius(2006) Veloso Espinosa, Felipe; Chuaqui, Herman; Aliaga-Rossel, Raul; Favre, Mario; Mitchell, Ian; Wyndham, Edmund; HerreraVelazquez, JJE
- ItemDynamics of laser produced annular plasmas(2018) Valenzuela-Villaseca, V.; Veloso Espinosa, Felipe; Munoz-Cordovez, G.; Favre, M.; Ruiz, H.M.; Wyndham, E.
- ItemLaser initiated hollow gas-embedded Z-pinch(IEEE, 2004) Chuaqui Kettlun, Hernán; Aliaga Rossel, Raul; Veloso Espinosa, Felipe; Pavez Morales, Cristian Arturo; Favre Domínguez, Mario; Mitchell, Ian H.; Wyndham Hodder, Edmund SydenhamResults of new optical method of generating a precursor plasma for a shell gas embedded Z-pinch are presented. Experiments were performed on a pulse power generator using a peak current up to 150 kA with a rise time of 70 ns, 120 ns pulse length. The optical precursor plasma was generated by using a Nd-Y AG laser, 200 ml, 8 ns at 1.06 μm. Two different optical schemes were used, one consists of a combination of lenses capable of producing a hollow beam; while the other uses an axicon to generate the hollow beam. In both cases the hollow beam was focused at the cathode surface where metallic ring plasma, of either 2 or 6 mm diameter, is created. The annular preionization is created immediately before or during the first 30 ns after the line voltage is applied. The discharge was carried out in a chamber filled with hydrogen gas at 1/3 atm. Flat electrodes were used with 10 mm separation. The anode has a 6 mm diameter central hole to allow the passage of the preionizing laser. Optical diagnostics (schlieren, shadowgraphy and interferometry) were performed using the second harmonics of the same laser used to preionize. Preionizing using an axicon results in better formed hollow discharges.
- ItemNano-óptica: escala visual de una realidad multidisciplinariaFuentealba Fabio, Ricardo Andrés; Hevia Zamora, Samuel Alejandro; Sáez Navarrete, César Antonio; Recio Cortés, Francisco Javier; Espinoza Guerra, Danilo; Arancibia Hernández, Gloria Cecilia; Bengoa Wunkhaus, Mónica; Zambrano Downing, Iván; Vielva Iriondo, José Antonio; Veloso Espinosa, Felipe
- ItemObservations of Ablation Dynamics in Wire-Array Z-Pinch Experiments on the Llampudken Generator(2012) Veloso Espinosa, Felipe; Suzuki-Vidal, F.; Molina, F.; Mitchell, I. H.; Chuaqui, H.; Favre, M.; Wyndham, E.
- ItemObservations of Ablation Dynamics in Wire-Array Z-Pinch Experiments on the Llampüdkeñ Generator(2012) Veloso Espinosa, Felipe; Suzuki Vidal, Francisco Andres; Molina, Francisco; Mitchell, Ian H.; Chuaqui Kettlun, Hernán; Favre Dominguez, Mario Benjamin; Wyndham Hodder, Edmund SydenhamWire-array Z-pinch experiments have been performed on the Llampüdkeñ generator (~470 kA in ~410 ns) [Chuaqui et al., Laser Part. Beams 15, 241 (1997)] using an overmassed load of aluminum wires. Time-resolved optical laser schlieren and extreme ultraviolet imaging were used in order to study the plasma ablation dynamics. The results show the formation and subsequent ablation of plasma from the wires, followed by the appearance of a precursor plasma column on the axis. According to these results and to the rocket model of wire ablation, an ablation velocity of (1.7-2.6) × 105 m/s is estimated, which is larger than those obtained in faster generators. Additionally, the main resemblances and differences with previous experiments are presented, allowing in this way to open the study of this configuration in smaller scale machines.
- ItemRadiographic imaging of insects using a copper x-pinch plasma backlighting source(2018) Vescovi, M.; Veloso Espinosa, Felipe; Munoz-Cordovez, G.; Valenzuela-Villaseca, V.; Favre, M.; Wyndham, E.
- ItemRefractive optical measurements on the Llampüdkeñ generator(2006) Suzuki, F.; Veloso Espinosa, Felipe; Molina, F.; Mitchell, I.; Chuaqui, H.; Aliaga-Rossel, R.; Favre, M.; Wyndham, E.