A time-resolved study of ionization, electron attachment and positive-ion drift in methane

Urquijo, J. de; Arriaga, C A; Cisneros, C.; Álvarez, I.

doi:10.1088/0022-3727/32/1/008

Cited by 60 publications

(53 citation statements)

References 14 publications

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“…Similar effects have been reported in [10]. Hence, to allow a proper signal evaluation, it is necessary to install a damping resistor R d = 1 MΩ and a parallel stabilization capacitor C = 2 nF on the high voltage side.…”

Section: Setup Of Pt Experimentssupporting

confidence: 55%

“…In our arrangement electric field distortions of protrusions were minimized through the use of photocathodes with a tailored support. Other concepts introduce inhomogeneities by using a mesh [10] to allow the laser light to reach the cathode. Through repeated measurements of the distance accuracy, other effects influencing the swarm parameter results can now be analyzed.…”

Section: Design Guidelinesmentioning

confidence: 99%

“…Nevertheless, these are essential to increase the comparability of different experiments. Based on the experience of using a previous experimental setup [8] for several years and on descriptions of other PT experiments [9,10,11,12], an improved PT setup was built. In section 2 the new setup is described, section 3 outlines the analytical model, section 4 explains the results of Ar, N 2 and CO 2 with emphasis on the accuracy, and in section 5 the design and the accuracy of the PT experiment are discussed.…”

Section: Introductionmentioning

confidence: 99%

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Detailed precision and accuracy analysis of swarm parameters from a pulsed Townsend experiment

Haefliger

Franck

2018

Review of Scientific Instruments

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Abstract. A newly built Pulsed Townsend experimental setup which allows to measure both electron and ion currents is presented. Based on findings operating a previous experiment and on literature, the accuracy of the experimental input parameters was identified as necessary requirement to obtain accurate swarm parameters such as the effective ionization rate coefficient, the density-reduced mobility and the density-normalized longitudinal diffusion coefficient. The influence of the input parameters (gap distance, applied voltage, measured pressure and temperature) is analyzed in detail. An overall accuracy of ±0.5% in the density reduced electric field (E/N ) is achieved, which is close to the theoretically possible limit using the chosen components. The precision of the experimental results is higher than the accuracy. Through an extensive measurement campaign, the repeatability of our measurements proved to be high and similar to the precision. The reproducibility of results at identical (E/N ) is similar to the precision for different distances but decreases for varying pressures. For benchmark purposes, measurements for Ar, CO 2 and N 2 are presented and compared with our previous experimental setup, simulations and other experimental references.PACS numbers: 00.00, 20.00, 42.10 Submitted to: Rev. Sci. Instrum. 2 Definitions (from [1] based on GUM [2]):True value:Value that would be obtained by a perfect measurement, true values are indeterminate by nature. Accuracy:Closeness of the agreement between the result of a measurement and a true value of the measurand. Error:Difference between a measurement and the true value of the measurand. Precision:Closeness of agreement between independent measurements of a quantity under the same conditions. It is a measure of how well a measurement can be made without reference to a theoretical or true value (only in [1]). For example the ionization rate is determined by a linear regression of the log(I) versus time there a random noise affecting I would affect the obtained ionization rate. I is the measured current. Repeatability:Precision of results of successive, independent measurements carried out under the same conditions. Reproducibility: Precision of results of successive independent measurements carried out under different conditions. Uncertainty:Parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand.

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Section: Setup Of Pt Experimentssupporting

confidence: 55%

Section: Design Guidelinesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Detailed precision and accuracy analysis of swarm parameters from a pulsed Townsend experiment

Haefliger

Franck

2018

Review of Scientific Instruments

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“…[2][3][4][5][6]. As to the detection of the particles, in part of the systems the displacement current generated in the electrode gap by the moving charges [7][8][9] is sensed, while in other systems the counting of particles arriving at a detector has been employed [3,10,11].…”

Section: Introductionmentioning

confidence: 99%

Scanning drift tube measurements of electron transport parameters in different gases: argon, synthetic air, methane and deuterium

Korolov¹,

Vass²

2016

J. Phys. D: Appl. Phys.

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Measurements of transport coefficients of electrons in a scanning drift tube apparatus are reported for different gases: argon, synthetic air, methane and deuterium. The experimental system allows the spatio-temporal development of the electron swarms ('swarm maps') to be recorded and this information, when compared with the profiles predicted by theory, makes it possible to determine the 'time-of-flight' transport coefficients: the bulk drift velocity, the longitudinal diffusion coefficient and the effective ionization coefficient, in a well-defined way. From these data, the effective Townsend ionization coefficient is determined as well. The swarm maps provide, additionally, direct, unambiguous information about the hydrodynamic/ non-hydrodynamic regimes of the swarms, aiding the selection of the proper regions applicable for the determination of the transport coefficients.

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“…A new swarm chamber has been built for studying electron attachment processes using pulsed Townsend technique [5,6]. A schematic diagram of an experimental set up is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

A new apparatus for measuring rate constants and activation energies of thermal electron capture processes in the gas phase

Kopyra¹,

Wnorowska²,

Foryś³

et al. 2007

International Journal of Mass Spectrometry

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A time-resolved study of ionization, electron attachment and positive-ion drift in methane

Cited by 60 publications

References 14 publications

Detailed precision and accuracy analysis of swarm parameters from a pulsed Townsend experiment

Detailed precision and accuracy analysis of swarm parameters from a pulsed Townsend experiment

Scanning drift tube measurements of electron transport parameters in different gases: argon, synthetic air, methane and deuterium

A new apparatus for measuring rate constants and activation energies of thermal electron capture processes in the gas phase

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