Physics Commons^™

Accordion Effect In Plasma Channels: Generation Of Tunable Comb-Like Electron Beams, Serge Y. Kalmykov, Bradley A. Shadwick, Isaac A. Ghebregziabher, Xavier Davoine, Remi Lehe, Agustin F. Lifschitz, Victor Malka

Serge Youri Kalmykov

Physical Processes At Work In Sub-30fs, Pw Laser Pulse-Driven Plasma Accelerators: Towards Gev Electron Acceleration Experiments At Cilex Facility., Arnaud Beck, Serge Y. Kalmykov, Xavier Davoine, Agustin F. Lifschitz, Bradley A. Shadwick, Victor Malka, Arnd E. Specka

Serge Youri Kalmykov

Optimal regimes and physical processes at work are identified for the first round of laser wakefield acceleration experiments proposed at a future CILEX facility. The Apollon-10P CILEX laser, delivering fully compressed, near-PW-power pulses of sub-25 fs duration, is well suited for driving electron density wakes in the blowout regime in cm-length gas targets. Early destruction of the pulse (partly due to energy depletion)prevents electrons from reaching dephasing, limiting the energy gain to about 3 GeV. However, the optimal operating regimes, found with reduced and full three-dimensional particle-in-cell simulations, show high energy efficiency, with about 10%of incident pulse energy transferred to …

All-Optical Control Of Electron Self-Injection In Millimeter-Scale, Tapered Dense Plasmas., Serge Y. Kalmykov, Xavier Davoine, Bradley A. Shadwick

Serge Youri Kalmykov

It is demonstrated that a laser pulse with an ultrahigh bandwidth (400 nm) is an asset for future high-repetition-rate , quasimonoenergetic (QME), GeV-scale laser plasma electron accelerators. Manipulating the phase of the driver has a direct impact on evolution of the accelerating bucket (a cavity of electron density maintained by the pressure of the laser pulse radiation), making it possible to control electron self-injection and the final parameters of the QME beam by purely optical means. The large bandwidth makes it possible to compensate for the frequency red-shift accumulated at the pulse leading edge in transit through the plasma. Advancing …

Syllabus_Lecture_Notes_Collective_Phenomena_In_Laser_Plasmas_Ii_Phy998_Spring_2014, Serge Y. Kalmykov

Serge Youri Kalmykov

High-power laser radiation beams interacting with a rarefied, fully ionized plasmas are essentially unstable. This fact is mainly due to the excitation of various modes of plasma oscillations, most important of which are electron Langmuir waves and ion acoustic waves. The stimulated scattering processes destroy and deplete the pulse in the as it propagates. On the other hand, at the moderate level of instability, spectral properties of the scattered light may serve as optical diagnostics of the pulse propagation dynamics. Knowing the dynamics of the stimulated scattering processes is thus essential for such applications as inertial confinement fusion and laser-plasma …