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Mathieu Lobet

photo identite
Mathieu Lobet Ph.D
1 Cyclotron Rd
MS 59R4010A
Berkeley, CA 94720 US


Mathieu Lobet graduated in 2012 in mathematical and mechanics modeling from the ENSEIRB-MATMECA engineering school in Bordeaux (France) with specializations in fluid dynamics, plasma physics, numerical analysis and high performance computing. He obtained his Ph.D. in 2015 focused on physics of laser-matter interaction and numerical simulation. He did his Ph.D. studies at the CEA near Paris in collaboration with the CELIA laboratory (Bordeaux) under the supervision of Laurent Gremillet (CEA) and Emmanuel d'Humieres (CELIA).

xyzn posi ey

Snapshot of a numerical simulation showing a positron bunch generated in the collision of a GeV electron beam with a counter-propagating laser pulse of intensity 10^23 W/cm^2. The positron density is represented via isosurfaces. Density slices are projected on the domain boundaries for the planes x = 27.5 (denser part of the head of the beam), y = 0 and z = 0. The laser is represented through the electric field Ey for isosurfaces a0 = eEy /mcω ∼ ±100.

His Ph.D. work was about the theoretical and the numerical study of the radiative and quantum electrodynamics effects in extremely intense laser-matter interaction. He investigated the role of the nonlinear inverse Compton scattering emission of high-frequency photons and the gamma-photon decay into pair via the nonlinear Breit-Wheeler process in different scenarii of laser-matter interaction at intensities above 10^22 W/cm^2.

He joined NERSC as a NESAP postdoc in January 2016. He is now working on the performance optimization of the Particle-In-Cell code WARP for the forthcoming massively parallel computing architectures (CORI) in collaboration with BELLA at LBL.



Research interests

High-performance computing, plasma physics, laser-matter interaction


Lobet, M., Kando, M., Koga, J. K., Esirkepov, T. Z., Nakamura, T., Pirozhkov, A. S., and Bulanov, S. V. (2013). Controlling the generation of high frequency elec- tromagnetic pulses with relativistic flying mirrors using an inhomogeneous plasma. Physics Letters A, 377(15), 1114-1118.

Lobet, M., d’Humires, E., Grech, M., Ruyer, C., Davoine, X., and Gremillet, L. (2013). Modeling of radiative and quantum electrodynamics effects in PIC simula- tions of ultra-relativistic laser-plasma interaction. arXiv preprint arXiv:1311.1107, Proceeding of the IFSA conference.

Lobet, M., Ruyer, C., Debayle, A., d’Humi ́eres, E., Grech, M., Lemoine, M. and Gremillet, L. (2015). Ultra-fast, synchrotron-enhanced thermalization of laser-driven colliding pair plasmas. Physical Review Letter, 115(21), 215003.

Lobet, M., Davoine, X., d’Humires, E. and Gremillet, L. (2015). Generation of high- energy electron-positron beams in the collision of a laser-accelerated electron beam and a multi-petawatt laser. arXiv preprint arXiv:1510.02301.

Capdessus, R., Lobet, M., d’Humi ́eres, E. and Tikhonchuk, V. T. (2014). γ-ray generation enhancement by the charge separation field in laser-target interaction in the radiation dominated regime. Physics of Plasmas (1994-present), 21(12), 123120.

Cros, B., Paradkar, B. S., Davoine, X., Chanc, A., Desforges, F. G., Dobosz-Dufrnoy, S., Delerue N., Ju J., Audet T. L., Maynard G., Lobet M., Gremillet L., Mora P., Schwindling J., Delferrire O., Bruni C., Rimbault C., Vinatier T., Di Piazza A., Grech M., Riconda C., Marqus J. R., Beck A., Specka A., Martin Ph., Monot P., Normand D., Mathieu F., Audebert P., Amiranoff, F. (2014). Laser plasma acceleration of electrons with multi-PW laser beams in the frame of CILEX. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 740, 27-33.

Ribeyre, X., d'Humières, E., Jansen, O., Jequier, S., Tikhonchuk, V. T., and Lobet, M. (2016). Pair creation in collision of γ-ray beams produced with high-intensity lasers. Physical Review E, 93(1), 013201.

E. dHumires, S. Chen, P. Antici, M. Bailly-Grandvaux, T. Gangolf, M. Lobet et al., Longitudinal laser ion acceleration in gas jets: experimental optimization on the Titan laser facility and numerical investigation of the ultra-high intensity limit, 42th EPS Conference proceedings, P2.154 (2015).

E. dHumires, S. Chen, M. Lobet et al., Longitudinal laser ion acceleration in gas jets: experimental optimization on the Titan laser facility and numerical investiga- tion of the ultra-high intensity limit, Proceedings of SPIE Vol. 9514, 95140B (2015).