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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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A tetrode based fast pulsed microwave source for electron cyclotron resonance breakdown experiments.

Vipin K Yadav1, K Sathyanarayana, D Purohit

  • 1Institute for Plasma Research, Bhat, Gandhinagar Gujarat - 382 428, India. vipin@csp.res.in

The Review of Scientific Instruments
|June 21, 2007
PubMed
Summary

A novel pulsed microwave source was developed for electron cyclotron resonance (ECR) plasma studies. This system enables rapid power switching, facilitating precise measurements of ECR breakdown and afterglow plasma characteristics.

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Area of Science:

  • Plasma Physics
  • Microwave Engineering
  • Fusion Energy Research

Background:

  • Electron cyclotron resonance (ECR) breakdown and afterglow plasma studies require precise control over microwave power delivery.
  • Conventional microwave sources often lack the rapid switching capabilities needed for detailed transient plasma analysis.

Purpose of the Study:

  • To design and test a pulsed microwave source with fast rise and fall times for ECR breakdown experiments.
  • To investigate the characteristics of ECR breakdown and afterglow plasma using the developed pulsed source.

Main Methods:

  • A tetrode, controlled by a modulator card, was employed as a fast switch for a 2.45 GHz magnetron.
  • Microwave power rise times of approximately 3 microseconds and fall times of approximately 10 microseconds were achieved.
  • Plasma density measurements using a Langmuir probe were utilized to observe plasma delay and fall times.

Main Results:

  • The designed pulsed microwave source successfully achieved ECR breakdown of neutral gas at 800 W power.
  • Initial experimental results demonstrated the capability to measure plasma delay and fall times.
  • The system exhibited rapid microwave power modulation suitable for transient plasma experiments.

Conclusions:

  • The developed fast-switching pulsed microwave source is effective for studying ECR breakdown and afterglow plasmas.
  • The system provides a valuable tool for precise transient plasma diagnostics in linear plasma devices.
  • Further research can leverage this source for advanced investigations into plasma dynamics and control.