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Related Experiment Video

Updated: May 20, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

A linear helicon plasma device with controllable magnetic field gradient.

Kshitish K Barada¹, P K Chattopadhyay, J Ghosh

¹Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428, India. kshitish@ipr.res.in

The Review of Scientific Instruments

|July 5, 2012

Summary

Current-free double layers (CFDLs) are localized potential structures. A new helicon plasma device investigates CFDL formation by controlling magnetic field gradients in an expanding chamber.

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Area of Science:

Plasma Physics
Space Physics

Background:

Current-free double layers (CFDLs) are localized potential structures.
CFDLs differ from current-driven double layers as they do not require a sustaining current.
Previous studies observed CFDLs in helicon-produced plasmas within expanding magnetic fields.

Purpose of the Study:

Investigate the role of magnetic field gradient and its position in CFDL formation.
Characterize helicon plasma production in a novel experimental setup.
Explore the device's capability for other plasma physics experiments.

Main Methods:

Designed and fabricated a new helicon plasma device with two chambers of different radii.
Utilized adjustable magnetic coils to create varying magnetic field gradients.
Studied CFDL formation by manipulating magnetic field parameters relative to the geometrical expansion.

Main Results:

The new device allows for controlled variation of magnetic field gradients.
Preliminary results demonstrate helicon plasma production and characterization capabilities.
The setup is suitable for studying CFDLs and other plasma phenomena.

Conclusions:

The designed helicon plasma device offers a unique platform for CFDL research.
The ability to control magnetic field gradients is crucial for CFDL formation.
The device is versatile for a range of basic plasma physics investigations.