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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

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Honeycomblike large area LaB6 plasma source for Multi-Purpose Plasma facility.

Hyun-Jong Woo¹, Kyu-Sun Chung, Hyun-Jong You

¹electric Probe Applications Laboratory (ePAL), Hanyang University, Seoul 133-791, Korea.

The Review of Scientific Instruments

|November 6, 2007

Summary

The Multi-Purpose Plasma (MP(2)) facility was renovated with new LaB(6) and helicon plasma sources. A novel honeycomb large area LaB(6) cathode enhances plasma generation for simulators.

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Area of Science:

Plasma physics
Fusion energy research
Materials science

Background:

The Hanbit mirror device was renovated into a Multi-Purpose Plasma (MP(2)) facility.
The facility adopts the diversified plasma simulator (DiPS) philosophy.
Two plasma sources (LaB(6) dc and helicon rf) were installed, creating three distinct simulators.

Purpose of the Study:

To renovate the Hanbit mirror device into a versatile plasma facility.
To develop a honeycomb large area LaB(6) (HLA-LaB(6)) cathode for improved plasma generation.
To characterize plasma properties generated by the new cathode.

Main Methods:

Renovation of the Hanbit mirror device.
Installation of LaB(6) (dc) and helicon (rf) plasma sources.
Development and testing of a honeycomb large area LaB(6) cathode.
Plasma property measurements using electric probes.

Main Results:

Achieved plasma density up to 2.6 x 10^12 cm^-3.
Electron temperature remained around 3-3.5 eV.
Demonstrated improved resistance to thermal shock for large, high-density plasma generation.

Conclusions:

The renovated MP(2) facility with HLA-LaB(6) cathode is suitable for divertor, space propulsion, and astrophysics simulations.
The HLA-LaB(6) cathode shows unique electric properties and plasma density profiles compared to single LaB(6) cathodes.
The new design enhances plasma generation capabilities for various research applications.