Development and studies on a compact electron cyclotron resonance plasma source

Ganguli, A.; Tarey, R. D.; Arora, N.; Narayanan, R.

doi:10.1088/0963-0252/25/2/025026

Cited by 16 publications

(20 citation statements)

References 23 publications

(41 reference statements)

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“…An indigenously developed electronic circuit and LABVIEW-based program were used to record the I-V characteristics for both, the discharge (V d -I d ) and the LP. The procedure for the analysis of the LP data and determination of the plasma parameters used in the present work has already been discussed in great detail in the appendix of an earlier paper by the authors [14] and can also be found elsewhere [15,[29][30][31][32]. Therefore, the LP analysis method will not be presented here.…”

Section: Diagnostics: Langmuir Probementioning

confidence: 99%

Observation of plasma boundary induced Negative Differential Resistance (NDR) in a planar DC discharge system

Barnwal,

Ganguli,

Narayanan

2023

Phys. Scr.

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Observation of Negative Differential Resistance (NDR) in the discharge characteristics of a planar DC discharge system induced by specific combination of plasma boundaries is reported. In a previous work [Barnwal et al 2022 Phys. Plasmas 29 072102] it was shown by the authors that no NDRs are triggered in enclosures that have either a fully conducting boundary (viz., an ss vacuum chamber) or a fully insulating boundary (apart from the electrodes), comprising of glass tubes/mica sheets, etc. In the present work, it is shown that an NDR is triggered when the discharge produced within a small enclosure with an insulating boundary (IB), is allowed to leak out through a small aperture into a larger volume with a conducting boundary (CB). As the plasma density increases with increasing discharge current, the Debye length (λ De), which is initially larger than the gap width at low discharge currents, decreases to become of the order of gap width, triggering the NDR. Since the plasma boundary conditions before and after the NDR are widely different (insulating versus mixed) the NDR, which is unstable electrically, connects a low-current, high-voltage state before the NDR to a high-current, low-voltage state afterward. Further, issues related to changes in the anode sheath before and after the NDR are also explored. When the electrode system is nearly symmetric, the anode sheath prior to the onset of the NDR is an ion sheath that flips into an electron sheath after the NDR. When the electrode system is highly asymmetric, the anode sheath remains an electron sheath throughout (both before and after the NDR). Reasons for such behavior are discussed in the paper.

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Section: Diagnostics: Langmuir Probementioning

confidence: 99%

Observation of plasma boundary induced Negative Differential Resistance (NDR) in a planar DC discharge system

Barnwal,

Ganguli,

Narayanan

2023

Phys. Scr.

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“…For non-magnetized high frequency plasmas, the relative permeability µ p r = 1. The density of the abosrbed power from the electromagnetic is calculated as in the following equation [1,[46][47][48][49].…”

Section: The Electromagnetic Field Modelmentioning

confidence: 99%

A Linear Microwave Plasma Source Using a Circular Waveguide Filled with a Relatively High-Permittivity Dielectric: Comparison with a Conventional Quasi-Coaxial Line Waveguide

2021

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For a conventional linear microwave plasma source (LMPS) with a quasi-coaxial line transverse electromagnetic (TEM) waveguide, a linearly extended plasma is sustained by the surface wave outside the tube. Due to the characteristics of the quasi-coaxial line MPS, it is easy to generate a uniform plasma with radially omnidirectional surfaces, but it is difficult to maximize the electron density in a curved selected region. For the purpose of concentrating the plasma density in the deposition area, a novel LMPS which is suitable for curved structure deposition has been developed and compared with the conventional LMPS. As the shape of a circular waveguide, it is filled with relatively high-permittivity dielectric instead of a quasi-coaxial line waveguide. Microwave power at 2.45 GHz is transferred to the plasma through the continuous cylindrical-slotted line antenna, and the radiated electric field in the radial direction is made almost parallel to the tangential plane of the window surface. This research includes the advanced 3D numerical analysis and compares the results with the experiment. It shows that the electron density in the deposition area is higher than that of the conventional quasi-coaxial line plasma MPS.

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“…Before describing the experimental system, it is worth dwelling upon the structure of the magnetic eld inside the CEPS. The CEPS itself is described in detail in reference [27] and shown in gure 1(a). The microwave launcher, the impedance matching unit and mode converter all form an integral part of the CEPS that allow coupling of CW microwaves (2.45 GHz, 200-600 W) into the plasma source section (PSS) through a quartz window.…”

Section: Ceps Magnetic Fieldmentioning

confidence: 99%

“…Some preliminary studies using these sources have also been undertaken. The CEPS has been used singly as a standalone source by attaching it to a small chamber [27,28]. Multiple CEPS (up to 12 in number) have also been used for lling a very large volume system [29,30] (∼1.7 m 3 ; dia ≈ 1 m) with high density, highly uniform plasma using very modest microwave power in each CEPS.…”

Section: Introductionmentioning

confidence: 99%

Thrust evaluation of compact ECR plasma source using 2-zone global model and plasma measurements

Verma

Ganguli

Sahu

et al. 2020

Plasma Sources Sci. Technol.

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Plasma thrusters are required for deep space applications for reducing the fuel payload. This paper evaluates the capability of a compact ECR plasma source (CEPS) as a standalone plasma thruster in space. The unique magnetic eld pro le of CEPS' ring magnets enables very ef cient plasma production and electron heating within the CEPS plasma source section (ID ≈ 8.5 cm, length ≈11.6 cm) resulting in high plasma potentials. Experiments were undertaken with the CEPS attached coaxially to a larger expansion chamber (ID ≈ 48.2 cm, length ≈75 cm). Diagnostics included specially designed Langmuir probes (LP) and ion energy analyzers (IEA) that are capable of withstanding the harsh plasma conditions in front of and within the CEPS. LP measurements reveal high-density argon plasma (≈10 12 cm −3 ), with high bulk electron temperatures (≈20 eV) and plasma potentials (≈100 V) at very modest microwave power (≈600 W) over a wide range of pressures (0.3-1 mTorr). An important observation is the fall of almost the full plasma potential inside the CEPS within a short distance close to its exit, giving rise to strong ambipolar electric elds suitable for accelerating ions. IEA measurements con rmed the presence of streaming ions with energies ≈87 eV at ≈2 cm in front of the CEPS. Estimates based on the IEA results yield thrust values ≈50 mN at ≈0.5 mTorr. A 2-zone, global model was developed to determine the steady state plasma parameters (including plasma ow velocity) in the geometry of the experimental system (without magnetic eld). The model reproduced the key experimental plasma parameters and was extended to compute plasma thrust under actual space-like conditions. The computed thrust values for xenon are higher (≈80 mN) than that for argon (≈40-45 mN) at ≈600 W of microwave power.

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Development and studies on a compact electron cyclotron resonance plasma source

Cited by 16 publications

References 23 publications

Observation of plasma boundary induced Negative Differential Resistance (NDR) in a planar DC discharge system

Observation of plasma boundary induced Negative Differential Resistance (NDR) in a planar DC discharge system

A Linear Microwave Plasma Source Using a Circular Waveguide Filled with a Relatively High-Permittivity Dielectric: Comparison with a Conventional Quasi-Coaxial Line Waveguide

Thrust evaluation of compact ECR plasma source using 2-zone global model and plasma measurements

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