TITLE

Particle acceleration and energy conservation in particle in cell simulations

AUTHOR(S)
Lapenta, Giovanni; Markidis, Stefano
PUB. DATE
July 2011
SOURCE
Physics of Plasmas;Jul2011, Vol. 18 Issue 7, p072101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Particle acceleration is a process of great importance in all areas of plasma physics. In most cases, kinetic effects are dominant and require a full kinetic treatment, such as the particle in cell (PIC) method. PIC methods are widely used in all aspects of plasma physics, proving to be a precious and irreplaceable tool. Yet all methods in use and published conserve energy to a good approximation, but not exactly. A well known property of PIC methods, documented extensively in all textbooks, is that energy is not conserved exactly. In fact, the particle noise is a unphysical source of energy that, when insufficient resolution is used, can make the simulations go unstable. In the present paper, we apply a new exactly energy conserving scheme and demonstrate that indeed exact energy conservation plays a key role in determining the correct spectrum of the accelerated particles.
ACCESSION #
63542441

 

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