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21/03/2024, 16:40
Laser Wakefield Acceleration (LWFA) stands as a promising particle acceleration mechanism leading to accelerating gradients orders of magnitude higher than those of conventional methods. Detailed understanding of the nonlinear laser-plasma interaction mechanisms of LWFA at the kinetic scale requires performing Particle in Cell (PIC) simulations.
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Although PIC codes exist since several decades,... -
21/03/2024, 16:40
In plasma-wakefield acceleration, non-relativistic particles quickly lose phase-locking due to the substantial difference between the driver's group velocity (nearly the speed of light) and the particles' velocities. Heavier particles such as muons [1] and pions have thus conventionally been excluded from this method. Recent advancements have introduced methods for shaping electromagnetic wave...
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21/03/2024, 16:40
Angular momentum transfer in nonlinear laser-plasma interactions, accompanied by strong axial magnetic field generation (Tesla to kilo-Tesla) [1-2], can significantly influence the dynamics during laser-driven particle acceleration. Axial magnetic field generation is typically identified in systems using lasers with angular momentum, such as circularly polarized lasers [1] and lasers with...
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21/03/2024, 16:40
Particle-in-Cell (PIC) codes commonly employ laser injection algorithms rooted in analytical solutions of the paraxial wave equation under the slowly-varying envelope approximation. These algorithms, while computationally efficient, are tailored to lasers with transverse spot sizes and temporal durations significantly larger than their respective wavelengths and periods. Consequently, they...
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21/03/2024, 16:40
The plasma-based particle acceleration promises very high accelerating fields. At the same time, it is widely accepted that uniform plasma only can support acceleration of negatively charged witness particles. Hollow plasma channels would be suitable for acceleration of witnesses of both charges due to the absence of focusing fields inside the vacuum channel core. Unfortunately, beams in the...
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21/03/2024, 16:40
The AWAKE experiment at CERN makes use of a self-modulated proton bunch to excite wakefields and accelerate a witness electron bunch. Run 2c of the experiment will demonstrate stabilization of the wakefield amplitude and control of the witness bunch emittance during injection and acceleration. In this work, we present an overview of the ongoing simulation efforts to support the project as it...
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21/03/2024, 16:40
The allure of attosecond pulses, which unravel electron behavior in atoms and find diverse applications across ultrafast phenomena, nuclear physics, and astrophysics, have captivated scientists in this field. The present investigation delves into the feasibility of generating attosecond pulses utilizing the Flying Mirror Mechanism at ELI Beamline Facilities. Achieving optimal reflection from...
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21/03/2024, 16:40
The development of laser technology will soon enable experiments focused on the interaction of laser pulses with power up to 10 PW with various types of plasma targets for purposes of electron acceleration. Amongst the others, the motivation is to reach the highest possible energies on distances shorter compared to conventional accelerators. We have recently shown using particle-in-cell...
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21/03/2024, 16:40
QuickPIC is a quasi-static PIC code for efficiently modeling the plasma based accelerators. It can be 1000 times faster than the conventional PIC code without losing accuracy. QuickPIC is developed based on the frame work UPIC. It has a hybrid parallelism algorithm that uses both OpenMP and MPI. Such an algorithm is also suitable for a GPU cluster. In this work, we will introduce the GPU+MPI...
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21/03/2024, 16:40
Particle acceleration over a short distance has a vast range of potential acceleration applications. While electron acceleration in plasmas has proven widely successful, accelerating positrons is an ongoing challenge. Positron acceleration is challenging as the accelerating guiding structures for electrons are inadequate to guide positrons. Recently, Direct Laser Acceleration has emerged as a...
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21/03/2024, 16:40
Some astrophysical objects (e.g., pulsars) harbor extremely intense electromagnetic fields in their immediate surroundings. These fields allow for spontaneous and proliferous electron-positron pair creation, generating what is called a lepton pair plasma. It has so far been impossible to replicate these conditions in a laboratory setup. The advances of state-of-the-art laser and accelerator...
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21/03/2024, 16:40
In direct laser acceleration (DLA) of electrons, the leading part of the laser pulse ionizes the target material and forms a positively charged ion plasma channel into which electrons are injected and accelerated.
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I will describe our recent work [Cohen, I., et. al, Science advances, 10(2), eadk1947(2024)] which shows that for efficient DLA to prevail, target materials of sufficiently...
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