Heating mechanisms in radio-frequency-driven ultracold plasmas

Smorenburg, P.W.; Kamp, Leon Lpj; Luiten, O.J.

doi:10.1103/physreva.85.063413

Cited by 8 publications

(10 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the given field strength in our cavity ν ei ≈ ν s = √ 2/(3π )ω p,e 3/2 e ln , as has been demonstrated by charged particle tracking simulations in Ref. [9], with ν s the Spitzer collision frequency, e the electron coupling parameter, and ln the Coulomb logarithm. Calculating the temperature increase per unit of time shows that P ei /k B ∼ 0.9 × 10 2 K/μs, indicating that the electric field could indeed have a significant heating effect on our ultracold plasma for early times.…”

supporting

confidence: 60%

“…Moreover, UNPs are ideal for studying fundamental plasma heating mechanisms, such as disorder-induced heating, three-body recombination (TBR), and collisional and collisonless microwave absorption [9].…”

mentioning

confidence: 99%

“…One effect that could possibly explain a higher expansion velocity is collisional absorption of microwave energy due to deflection of the quivering electrons in the stationary Coulomb fields of the ions [9]. The amount of energy absorbed by the electrons depends on the electric field amplitude.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Microwave cavity resonance spectroscopy of ultracold plasmas

et al. 2019

Self Cite

View full text Add to dashboard Cite

DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:

show abstract

supporting

confidence: 60%

mentioning

confidence: 99%

See 1 more Smart Citation

Microwave cavity resonance spectroscopy of ultracold plasmas

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…collisional damping via electron-ion collisions). This heat is then presumably collisionally redistributed [17], promoting some electrons to energies that can overcome the electrostatic space charge, provided by the excess of ions [1], allowing them to escape.…”

mentioning

confidence: 99%

Density-dependent response of an ultracold plasma to few-cycle radio-frequency pulses

2013

View full text Add to dashboard Cite

Ultracold neutral plasmas exhibit a density-dependent resonant response to applied radiofrequency (RF) fields in the frequency range of several MHz to hundreds of MHz for achievable densities. We have conducted measurements where short bursts of RF were applied to these plasmas, with pulse durations as short as two cycles. We still observed a density-dependent resonant response to these short pulses, but the timescale of the response is too short to be consistent with local heating of electrons in the plasma from collisions under a range of experimental parameters. Instead, our results are consistent with rapid energy transfer from collective motion of the entire electron cloud to individual electrons. This collective motion was also observed by applying two sharp electric field pulses separated in time to the plasma. These measurements demonstrate the importance of collective motion in the energy transport in these systems.

show abstract

“…In absence of plasma resonances, the most important heating mechanism [61] Finally, we should mention the strongly peaked outward ponderomotive near the edge of the plasma, which is, of course, disadvantageous for the stability of the plasma. Initially, the electrons in the edge region will probably be expelled from the plasma by this force.…”

Section: Acceleration Of Ultracold Plasmasmentioning

confidence: 99%

Ponderomotive manipulation of cold subwavelength plasmas

2013

Self Cite

View full text Add to dashboard Cite

Ponderomotive forces (PFs) induced in cold subwavelength plasmas by an externally applied electromagnetic wave are studied analytically. To this end, the plasma is modeled as a sphere with a radially varying permittivity, and the internal electric fields are calculated by solving the macroscopic Maxwell equations using an expansion in Debye potentials. It is found that the PF is directed opposite to the plasma density gradient, similarly to large-scale plasmas. In the case of a uniform density profile, a residual spherically symmetric compressive PF is found, suggesting possibilities for contactless ponderomotive manipulation of homogeneous subwavelength objects. The presence of a surface PF on discontinuous plasma boundaries is derived. This force is essential for a microscopic description of the radiation-plasma interaction consistent with momentum conservation. It is shown that the PF integrated over the plasma volume is equivalent to the radiation pressure exerted on the plasma by the incident wave. The concept of radiative acceleration of subwavelength plasmas, proposed earlier, is applied to ultracold plasmas. It is estimated that these plasmas may be accelerated to keV ion energies, resulting in a neutralized beam with a brightness comparable to that of current high-performance ion sources.

show abstract

Heating mechanisms in radio-frequency-driven ultracold plasmas

Cited by 8 publications

References 64 publications

Microwave cavity resonance spectroscopy of ultracold plasmas

Microwave cavity resonance spectroscopy of ultracold plasmas

Density-dependent response of an ultracold plasma to few-cycle radio-frequency pulses

Ponderomotive manipulation of cold subwavelength plasmas

Contact Info

Product

Resources

About