A computerized Langmuir probe system

Pilling, L.S.; Bydder, E.L.; Carnegie, Dale A.

doi:10.1063/1.1581362

Cited by 13 publications

(7 citation statements)

References 18 publications

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“…In this study the design of data acquisition system is presented, which ensures accurate measurements of the current-voltage (I-V) single probe characteristics without current sensing resistor. Current sensing resistor is the conventional and simplest method of measurements [9,[26][27][28], but although simple to implement, there are certain problems with this approach. If the resistor is floating, a differential voltage signal has to be converted additionally before it is measured by a grounded oscilloscope.…”

Section: Introductionmentioning

confidence: 99%

EEDF Determination by Numerical Processing of the Probe Data in Neon DC Discharge

Djermanova

Kiss’ovski

Tsankov

2006

Contrib. Plasma Phys.

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Numerical processing of the data from single probe measurements allows determination of the electron energy distribution function (EEDF) from the second derivative of the probe current. The current-voltage probe characteristics are measured by acquisition system for further smoothing and differentiation. The developed procedure is a combination of the Savitzky-Golay (S-G) smoothing filter and three-point differentiator with varying step. The above methods are modified for irregularly sampled data which enables more accurate determination of EEDF. Advantages of this approach are data smoothing with minimum information loss and improved noise reduction at the differentiation procedure. The procedure is applied for EEDF calculation in low current low pressure neon discharge. The shape of EEDF shows deviation from both Maxwellian and Druyvesteyn distributions.

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Section: Introductionmentioning

confidence: 99%

EEDF Determination by Numerical Processing of the Probe Data in Neon DC Discharge

Djermanova

Kiss’ovski

Tsankov

2006

Contrib. Plasma Phys.

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“…Pulsed plasma and pulsed ion beam phenomena can be investigated using the Langmuir probe [10][11][12] and Faraday cup diagnostics. These efficient diagnostic methods have been used to study the change of plasma and beam parameters in the hydrogen ECR plasmas.…”

Section: Introductionmentioning

confidence: 99%

Plasma characterization in CW and pulsed mode and its effect on beam current in 2.45 GHz ECR Ion source

et al. 2022

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Electron Cyclotron Resonance Ion Source (ECRIS) is used as a front end for Low Energy High Intensity Proton Accelerator (LEHIPA) at BARC. A 50 keV ECRIS is designed and developed for the proton ion beam for this accelerator. The key requirements of the ion source are beam current ∼ 10 – 15 mA and beam emittance ∼ 0.2 π mm-mrad. In the commissioning phase of LEHIPA, the ion source is operated in pulsed mode to mitigate the effect of thermal and radiation load. Measurements have been carried out to understand the behavior of pulsed plasma and its effect on ion beam. An Automated Langmuir Probe (ALP) and its associated circuit are designed and developed for this purpose. The ALP circuit consists of a voltage sweep generator, current sense circuit, and voltage sense circuit. The effect of microwave power and pulsed plasma duration on the plasma and the ion beam parameters have been studied. The plasma parameters are correlated with the beam parameters.

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“…[2,3]. One of these techniques is the use of the Langmuir double probe [19][20][21][22][23][24], as well as the use of the spectrum emitted from the plasma by using it to calculate the parameters of the plasma [25]. Salman et al [26] changed the distance between the double probe and studied the effect of this change on the I-V characteristic curve Ghasemi et al [27] found the electron temperature and electron density practically and in a simulated manner using the Langmuir double probe and they calculated the frequency of the argon plasma which was the highest and the electron temperature in the hydrogen plasma was the highest.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Low-Pressure Plasma Parameters by the Floating Double Probe Method for Dry Air and Helium Gas in a Capillary Glow Discharge

Khalid¹,

Ahmed²

2022

J.Edu.Sci.

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The electrical continuous glow discharge is in the capillary tubes. It has gained great interest especially in the applications of liquid crystals as well as display plasmas and soft x-ray lasers. In the present work, an electrical discharge system was designed consisting of a capillary tube and two electrodes. The cathode takes on a hollow geometric shape from nickel material to obtain a high current density. The anode electrode is a tungsten material. The inter-electrodes distance was taken as 12 cm. The floating Langmuir double probe was used as a diagnostic Tool to measure the plasma parameters at different ranges of gas pressure for dry air and helium as working gases. The current-voltage characteristics of the double probe were measured at gas pressure 0.2, 0.3, 0.4, 0.5, 0.6, and 0.7 torr. All measurements are conducted at a constant power of 0.6 watt. Electron temperature and ion saturation current were extracted from the I-V characteristics curves. The electron density, Debye length, and plasma frequency were calculated. It was observed that the electron temperature decreases with increasing working gas pressure. The influence of pressure on electron density and ion saturation current gave a clear similarity to the variation in them with pressure in both gases used. Comparisons of the effect of pressure on plasma parameters in working gases were illustrated. The results were in reasonable agreement with previous research.

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A computerized Langmuir probe system

Cited by 13 publications

References 18 publications

EEDF Determination by Numerical Processing of the Probe Data in Neon DC Discharge

EEDF Determination by Numerical Processing of the Probe Data in Neon DC Discharge

Plasma characterization in CW and pulsed mode and its effect on beam current in 2.45 GHz ECR Ion source

Measurement of Low-Pressure Plasma Parameters by the Floating Double Probe Method for Dry Air and Helium Gas in a Capillary Glow Discharge

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