Current transfer in dc non-transferred arc plasma torches

Ghorui, S.; Sahasrabudhe, S N; Das, Avik

doi:10.1088/0022-3727/43/24/245201

Cited by 16 publications

(14 citation statements)

References 33 publications

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“…For this study, the axial component of the magnetic field responsible for the rotational motion of the arc is applied in such a way that it causes the cathodic arc root to rotate in the opposite direction of the vortex injecting plasma gas. Since the motion of the arc root is induced by the application of an external magnetic field, it is obvious that a reversal of the direction of the magnetic field should be able to impart a motion of the arc root just in the reverse direction [5]. Note that the total magnetic field within the torch represents the contributions of the magnetic field generated by the coil as well as the magnetic fields generated by the arc current and the cathode current.…”

Section: Magnetic Fieldmentioning

confidence: 99%

“…If the attachment is constricted there is a formation of arc root on the nozzle and the external magnetic field imparts a rotational movement to the constricted attachment due to appreciable Lorentz forces. This arc root movement is sometimes designed, induced root movement (IRM) [5]. Due to the forces the arc root rotates, each turn corresponds to one maximum in the Figure 11.…”

Section: Cathodic Arc Root Motionmentioning

confidence: 99%

“…It does not allow a detailed understanding of their internal functioning as the flow path from the injection chamber or description of the arc attachment in the hollow cathode. In the anode region, the difficulty to visualize the arc anode root or to quantify the erosion is also difficult, however studies performed not in hollow cathode but in rod cathode have being published showing new interesting results and possibilities [5,6]. Because of these limitations in hollow cathode, numerical studies are the most suitable for a better understanding of their internal behavior.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Theoretical study of the arc motion in the hollow cathode of a dc thermal plasma torch

Sambou¹,

Gonzalez²,

Benmouffok³

et al. 2021

J. Phys. D: Appl. Phys.

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A 3D model of a hollow cathode of a thermal plasma torch was developed to study the motion of the electric arc in the upstream part as well as its influence on the characteristics of the thermal plasma generated at the entrance of the downstream part (anode). The translational motion along the axis and the rotational velocity of the cathodic arc root are studied. The results of the model are presented and compared with those of the literature and also with experimental results. Good agreements on the prediction of the axial arc position and of the rotational speed of the arc root are found with the literature. A correlation is also shown between the theoretical positions of the arc root and the experimental traces of erosion observed on the cathode.

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Section: Magnetic Fieldmentioning

confidence: 99%

Section: Cathodic Arc Root Motionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical study of the arc motion in the hollow cathode of a dc thermal plasma torch

Sambou¹,

Gonzalez²,

Benmouffok³

et al. 2021

J. Phys. D: Appl. Phys.

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show abstract

“…The arc heater has the advantage that it allows for independent variation of gas composition with respect to temperature and pressure, thereby permitting an ideal gas mixture ratio at required temperature and pressure conditions for longer run times. [10][11][12] An arc heater is neat and clean, and is the best laboratory apparatus for optimizing laser parameters.…”

Section: Introductionmentioning

confidence: 99%

Data Acquisition System for Arc-Driven Hf/Df Chemical Lasers

Sagar

Kant

Mainuddin

et al. 2012

Instrumentation Science & Technology

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& The article focuses on the development of a data acquisition system (DAS) working in a noisy and hostile environment for an arc-operated hydrogen fluoride=deuterium fluoride (HF=DF) chemical laser. PC-based DAS has been configured using Advantech plug and play modules with fiber link connectivity. This article also focuses on implementation of an orifice-based precise gas flow control system. The plasma arc discharge in an arc heater=generator is essentially employed for inducing thermal dissociation of sulfur hexafluoride SF 6 for production of fluorine atoms, and DAS has been used for performance optimization of the composition of the lasing mixture by independently varying the flow rate, pressure, and temperature of its constituents. Since arc load is complex with high voltage transients and electromagnetic noise, an optical fiber link has been implemented for data transmission. This article also discusses digital output interface circuitry for various electro-pneumatic actuators=solenoid valves. The developed DAS has been used for monitoring and performance evaluation of parameters for 50 kW arc tunnel.

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“…In order to optimize processes and to control the effect generated in arc plasma, it is essential to understand the basic arc discharge phenomena. [5][6][7][8] Numerous researchers in the field of lasers have used arc heaters as a laboratory tool for development of various laser systems such as Gas Dynamic Laser (GDL) and Hydrogen Fluoride/Deuterium Fluoride (HF/DF) chemical lasers. [9][10][11][12] The development of advanced computational techniques have enabled study of arc plasma heaters to understand the underlying mechanics in terms of the developed temperature field for the heat fluxes produced along with the variation in velocity field and material properties.…”

Section: Introductionmentioning

confidence: 99%

Performance and Control of 50 kW Arc Heater for Chemical Lasers

Sagar¹,

Kant²,

Singhal³

et al. 2012

j adv phys

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Electric arc is a safe alternative to combustion for dissociation of SF 6 required for optimizing the experiments related to development of hydrogen fluoride/deuterium fluoride (HF/DF) laser. The plasma arc discharge in an arc heater/generator is essentially employed for inducing thermal dissociation of SF 6 for production of fluorine atoms. Another accrued advantage of using arc heater is that there is a possibility of varying the composition of the lasing mixture independently of the pressure and temperature of its constituents. However, in order to use arc heater for lasers applications, it is not only necessary to have an efficient arc heater, but interfacing it with the Data acquisition system and the laser tunnel is equally important. The paper reports the basic design and performance of 50 kW arc plasma tunnel relevant for hydrogen fluoride/deuterium fluoride (HF/DF) laser applications. Complete instrumentation required for testing and its integration with the simulated laser tunnel has been implemented. The arc behavior has been studied on the developed 50 kW arc heater with Nitrogen using a dedicated data acquisition system employing fibre optics link to cater for electromagnetic noise and hostile environment. The 50 kW arc generator should serve as a versatile tool for optimizing lasers parameters such as gas flow rate, pressure, temperature and Mach number for a kilowatt HF/DF Laser.

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Current transfer in dc non-transferred arc plasma torches

Cited by 16 publications

References 33 publications

Theoretical study of the arc motion in the hollow cathode of a dc thermal plasma torch

Theoretical study of the arc motion in the hollow cathode of a dc thermal plasma torch

Data Acquisition System for Arc-Driven Hf/Df Chemical Lasers

Performance and Control of 50 kW Arc Heater for Chemical Lasers

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