FABIO BITTENCOURT DUTRA TABACOW

FABIO BITTENCOURT DUTRA TABACOW

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Ultrafast laser micromachining of submillimetric de Laval nozzles in alumina for laser electron acceleration
2022 - ZUFFI, ARMANDO V.F.; TABACOW, FABIO B.D.; VIEIRA JUNIOR, NILSON D.; SAMAD, RICARDO E.
We have explored the fabrication of submillimetric de Laval nozzles by ultrashort laser pulses micromachining in alumina, a dielectric ceramic, to generate supersonic gas jets in vacuum. The nozzles were manufactured in a home-built trepanning setup, and their geometry and surface quality dependence on the laser and machining parameters was investigated, aiming to control the jet spatial density to produce optimal gaseous targets for laser electron acceleration.
On the development of a low peak-power, high repetition-rate laser plasma accelerator at IPEN
2021 - BONATTO, A.; MALDONADO, E.P.; NUNES, R.P.; ZUFFI, A.V.F.; TABACOW, F.B.D.; SAMAD, R.E.; VIEIRA JUNIOR, N.D.
In this work, the current status on the development of a laser plasma accelerator at the Nuclear and Energy Research Institute (Instituto de Pesquisas Nucleares e Energéticas, IPEN/CNEN), in São Paulo, Brazil, is presented. Short pulses to be produced by an under-development near-TW, kHz laser system will be used to ionize a gas jet, with a density profile designed to optimize the self-injection of plasma electrons. The same laser pulse will also drive a plasma wakefield, which will allow for electron acceleration in the self-modulated regime. The current milestone is to develop the experimental setup, including electron beam and plasma diagnostics, required to produce electron bunches with energies of a few MeV. Once this has been achieved, the next milestone is to produce beams with energies higher than 50 MeV. Besides kickstarting the laser wakefield accelerator (LWFA) technology in Brazil, this project aims to pave the way for conducting research on the production of radioisotopes by photonuclear reactions, triggered by LWFA accelerated beams.
Theoretical and experimental study of supersonic gas jet targets for laser wakefield acceleration
2021 - TABACOW, FABIO B.D.; ZUFFI, ARMANDO V.F.; MALDONADO, EDISON P.; SAMAD, RICARDO E.; VIEIRA JUNIOR, NILSON D.
This work reports a theoretical and experimental study of supersonic gas jets to be used as targets in laser wakefield acceleration. A comparison between theoretical and experimental results ismade in order to estimate the results of a de Laval nozzle manufactured in our laboratory, used to produce a N2 gas target. The comparison between the results shows that Computational Fluid Dynamicssimulations are able todescribe the phenomena of the supersonic gas jet.
Development of dielectric de Laval nozzles for laser electron acceleration by ultrashort pulses micromachining
2021 - CHIOMENTO, BRUNO B.; ZUFFI, ARMANDO V.F.; VIEIRA JUNIOR, NILSON D.; TABACOW, FABIO B.D.; MALDONADO, EDISON P.; SAMAD, RICARDO E.
This work reports the development and experimental implementation of a methodology for manufacturing submillimetric de Laval nozzles by ultrashort laser pulses micromachining by trepanning. The use of a ceramic substrate resulted in the fabrication of nozzles with high circularity and low roughness, which should generate high-quality gas targets for accelerating electrons with ultrashort laser pulses.
Laser particle acceleration in Brazil
2019 - VIEIRA JUNIOR, NILSON D.; BANERJEE, SUDEEP; MALDONADO, EDISON P.; ZUFFI, ARMANDO V.F.; TABACOW, FABIO B.D.; SAMAD, RICARDO E.
The fast-growing field of particle acceleration using lasers is now in a new trend due to an enormous worldwide effort to increase the peak power of femtosecond laser systems, as well as increasing the average power of these systems in order to make them useful for applications. The most spectacular example of investment in this area is the Extreme Light Infrastructure in Europe, which has led to the establishment of three large research facilities in the Czech Republic, Romania and Hungary that host some of the most powerful lasers world-wide (above PW peak power). The decade’s long progress in this area is being celebrated by the conferment of the 2018 Nobel Prize in Physics to Gerard Mourou and Donna Strickland, who pioneered the technique of Chirped Pulse Amplification, on which all modern-day ultrashort and ultra-intense lasers are based. These lasers can produce extreme conditions that mimic the ones found in stellar cores. Besides the basic physics that is being brought to light due to these new regimes, several applications of these systems are very promising, and one of them, the acceleration of charged particles, is the goal of this program. Laser particle accelerators are compact and need less radiation shielding, predicting a significant cost reduction with impact in the widespread use, mostly in medicine.
Self-modulated laser-plasma acceleration in a H2 gas target, simulated in a spectral particle-in-cell algorithm
2019 - MALDONADO, EDISON P.; SAMAD, RICARDO E.; ZUFFI, ARMANDO V.F.; TABACOW, FABIO B.D.; VIEIRA JUNIOR, NILSON D.
We evaluate the results of self-modulated, laser wakefield acceleration of electrons in homogeneous, 150-μmthick hydrogen gas target, simulated using the spectral particle-in-cell algorithm FBPIC. Considering a single 2-TW laser pulse at 800-nm, which generates ionization and plasma displacement at relativistic intensities, we discuss the resultant wakefield phases, wave-breaking, and the ejected electron bunch properties: charge, length, divergence and energy, also comparing with experimental results.