Ionization efficiency in a geometrically pinched cascaded arc

Burm, Ktal Karel; Goedheer, W. J.; Mullen, van der Jjam Joost; Janssen, GM Ger; Schram, DC Daan

doi:10.1088/0963-0252/7/3/018

Cited by 20 publications

(37 citation statements)

References 29 publications

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“…[ [25][26][27][28][29][30]. Salient additions for this work include the wall heat transport module and algorithmic changes to improve the treatment of plasmas with very high ionization degree.…”

Section: E the Codementioning

confidence: 99%

Nonlocal-thermal-equilibrium model of a pulsed capillary discharge waveguide

2005

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Slow pulsed capillary discharges are under investigation for use as plasma channel waveguides in laser-wakefield acceleration. In this study, we present a non-local thermal equilibrium (non-LTE) plasma model with a model for the wall temperature coupled to it. This model is used to describe an example of a slow pulsed capillary discharge, and the results are compared with experimental results. The agreement is satisfactory, indicating suitability of our model. Significant deviations from LTE are found during the formation of the plasma channel. The model is also used to study the influence of the discharge current on the guiding properties. It was found that this influence is small over most of the current range that was investigated.

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Section: E the Codementioning

confidence: 99%

Nonlocal-thermal-equilibrium model of a pulsed capillary discharge waveguide

2005

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“…Accurate EII cross sections (EIICSs) for ground and excited states of atoms and molecules are important in modeling arcs [4], discharges [5], plasmas [6], the solar atmosphere [7] and astrophysical media [8], as well as in spectroscopy [9] of ionized media and benchmarking theoretical predictions [10]. Most EII studies have involved ground states [1,2].…”

mentioning

confidence: 99%

“…Ionization thresholds for low lying target states studied to date were several eV, and EIICSs had magnitudes of several 10 ÿ16 cm 2 . High Rydberg states (HRSs) of atoms and molecules, e.g., having n 30, exist alongside low-energy electrons in most plasmas of laboratory, upper atmosphere, astrophysical, and technological interest [1][2][3][4][5][6][7][8][9]. HRSs have binding energies much less than 1 eV and act as excellent electron donors [3].…”

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confidence: 99%

Electron Impact Ionization of Sodium Rydberg Atoms below 2 eV

Nagesha

MacAdam

2003

Phys. Rev. Lett.

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We have observed electron impact ionization of highly excited sodium Rydberg atoms in ns and nd states, n=35-51, below E=2 eV electron kinetic energy with energy resolution 0.25 eV. Measured absolute cross sections near 0 eV range from sigma(35d) approximately 7 x 10(-10) to sigma(50d) approximately 4 x 10(-9) cm(2). The energy dependence is consistent with that of widely used binary encounter approximation cross sections, and sigma(n) follows a power law in n. The measured cross sections are 14 to 24 times larger than theoretically predicted values. This enhancement may signal the effect of large polarizabilities of high Rydberg states not yet accounted for in ionization theories.

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“…13 The measured 16% ionization efficiency again supports postsource heating. We demonstrated that this combination leads to significant power dissipation in the plasma outside the source.…”

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confidence: 70%

Extreme hydrogen plasma densities achieved in a linear plasma generator

Rooij¹,

Veremiyenko²,

Goedheer³

et al. 2007

Applied Physics Letters

147

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Effect of Ti-Al cathode composition on plasma generation and plasma transport in direct current vacuum arc Estimation of electron temperature and density of the decay plasma in a laser-assisted discharge plasma extreme ultraviolet source by using a modified Stark broadening method A magnetized hydrogen plasma beam was generated with a cascaded arc, expanding in a vacuum vessel at an axial magnetic field of up to 1.6 T. Its characteristics were measured at a distance of 4 cm from the nozzle: up to a 2 cm beam diameter, 7.5ϫ 10 20 m −3 electron density, ϳ2 eV electron and ion temperatures, and 3.5 km/ s axial plasma velocity. This gives a 2.6ϫ 10 24 H + m −2 s −1 peak ion flux density, which is unprecedented in linear plasma generators. The high efficiency of the source is obtained by the combined action of the magnetic field and an optimized nozzle geometry. This is interpreted as a cross-field return current that leads to power dissipation in the beam just outside the source.

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Ionization efficiency in a geometrically pinched cascaded arc

Cited by 20 publications

References 29 publications

Nonlocal-thermal-equilibrium model of a pulsed capillary discharge waveguide

Nonlocal-thermal-equilibrium model of a pulsed capillary discharge waveguide

Electron Impact Ionization of Sodium Rydberg Atoms below 2 eV

Extreme hydrogen plasma densities achieved in a linear plasma generator

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