Heating mechanisms in radio frequency driven ultracold plasmas

Details Heating mechanisms in radio frequency driven ultracold plasmas Heating mechanisms in radio frequency driven ultracold plasmas

2012-02-16

arxiv.org/abs/1202.3578v1

Physics

Plasma Physics

12 pages, 7 figures

Scientific paper

Several mechanisms by which an external electromagnetic field influences the temperature of a plasma are studied analytically and specialized to the system of an ultracold plasma (UCP) driven by a uniform radio frequency (RF) field. Heating through collisional absorption is reviewed and applied to UCPs. Furthermore, it is shown that the RF field modifies the three body recombination process by tunnel-ionizing electrons from intermediate high-lying Rydberg states, whereby the three body recombination rate and associated plasma heating is suppressed. Heating through collisionless absorption associated with the finite plasma size is calculated in detail, revealing a temperature threshold below which collisionless absorption is ineffective. It is found that, for large RF amplitude, the ponderomotive potential replaces the electron temperature in functional dependencies of several plasma quantities.

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