Microwave diagnostics of ultracold neutral plasma

Lu, Ray; Guo, Liyuan; Guo, Jingwei; Han, Shensheng

doi:10.1016/j.physleta.2011.04.027

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…These plasmas are typically generated by photo-ionizing lasercooled gases [1] or gases in an ultrasonic jet [2]. They are diagnosed using three-body recombination [3][4][5][6][7][8], thermalization rates [9][10][11][12], electron evaporation or rf absorption [3,[13][14][15][16][17][18], charged particle imaging and detection [2,19], and optical fluorescence [12,20,21] and absorption [22][23][24]. Theoretical calculations and simulations [25][26][27][28][29][30][31][32] give great insights into the properties of these plasmas.…”

mentioning

confidence: 99%

Limit of strong ion coupling due to electron shielding

2013

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We show that strong coupling between ions in an ultracold neutral plasma is limited by electron screening. While electron screening reduces the quasi-equilibrium ion temperature, it also reduces the ion-ion electrical potential energy. The net result is that the ratio of nearest-neighbor potential energy to kinetic energy in quasi-equilibrium is constant and limited to approximately 1 unless the electrons are heated by some external source. We support these conclusions by reporting new measurements of the ion velocity distribution in an ultracold neutral calcium plasma. These results match previously reported simulations of Yukawa systems. Theoretical considerations are used to determine the screened nearest-neighbor potential energy in the plasma.

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confidence: 99%

Limit of strong ion coupling due to electron shielding

2013

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“…There are two main channels for detecting the properties of UNPs: charged-particle detection and optical probes, namely laser-induced fluorescence and absorption spectroscopy. In addition, one can use spectroscopic techniques to probe the fields inside of an UNP [12,56,57].…”

Section: Detection Techniquesmentioning

confidence: 99%

Ultracold neutral plasmas

Lyon

Rolston²

2016

Rep. Prog. Phys.

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By photoionizing a sample of laser-cooled xenon atoms, we create ultracold neutral plasmas with initial temperatures of 1-1000 K and densities as high as 101 0 cm-3 . The plasma is formed by the trapping of electrons by the residual positive charge that is left after some electrons initially leave the sample. We excite plasma oscillations with applied radio frequency fields and use this to monitor the expansion of the unconfined plasma. We have observed significant recombination of the plasma into Rydberg atoms (up to 20 %). At these low temperatures, the only traditional form of recombination that could be significant is three-body recombination (TBR), but we see a number of trends in direct contradiction to what one would expect from classical TBR theory.

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“…If radiation propagates through a gas of Rydberg atoms [12] wave instabilities can occur due to energy transfer between excited Rydberg states and plasma electrons, and electrostatic waves [13]. Lu et al [14] suggested microwaves as a tool to measure the recombination rate of electrons and ions in ultra-cold neutral plasmas. Mendonça et al [15] predicted the generation of quasi-stationary magnetic fields by high-intensity radiation in Rydberg plasmas.…”

Section: Introductionmentioning

confidence: 99%

Propagation of radiation pulses through gas–plasma mixtures

Marzlin

Panwar

Razul

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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We determine the linear optical susceptibility of a radiation pulse propagating through a mixture of a gas of atoms or molecules and a plasma. For a specific range of radiation and plasma frequencies, resonant generation of volume plasmons significantly amplifies the radiation intensity. The conditions for resonant amplification are derived from the dispersion relations in the mixture, and the amplification is demonstrated in a numerical simulation of pulse propagation.

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Microwave diagnostics of ultracold neutral plasma

Cited by 5 publications

References 15 publications

Limit of strong ion coupling due to electron shielding

Limit of strong ion coupling due to electron shielding

Ultracold neutral plasmas

Propagation of radiation pulses through gas–plasma mixtures

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