A tetrode based fast pulsed microwave source for electron cyclotron resonance breakdown experiments

To study electron cylotron resonance (ECR) breakdown and afterglow plasma in an experimental linear plasma system, a pulsed microwave source with rapid rise and fall of microwave power is desired. A pulsed microwave source with fast rise and fall capability for ECR breakdown experiments has been des...

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Bibliographic Details
Published in:Review of scientific instruments 2007-02, Vol.78 (2), p.023503-023503-4
Main Authors: Yadav, Vipin K., Sathyanarayana, K., Purohit, D., Bora, D.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AFTERGLOW
BREAKDOWN
DESIGN
ELECTRON CYCLOTRON-RESONANCE
ELECTRONS
GHZ RANGE 01-100
HIGH-FREQUENCY DISCHARGES
LANGMUIR PROBE
MAGNETRONS
MICROWAVE RADIATION
PLASMA
PLASMA DENSITY
PULSE RISE TIME
SWITCHES
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Summary:To study electron cylotron resonance (ECR) breakdown and afterglow plasma in an experimental linear plasma system, a pulsed microwave source with rapid rise and fall of microwave power is desired. A pulsed microwave source with fast rise and fall capability for ECR breakdown experiments has been designed and tested for performance in the system. A tetrode, controlled by a modulator card, is used as a fast switch to initiate microwave power from a conventional magnetron operating at 2.45 GHz. The typical rise time of microwave power is ∼ 3 μ s and a fall time of ∼ 10 μ s . Using this scheme in a realistic pulsed microwave source at 800 W power, ECR breakdown of neutral gas is achieved and the plasma delay and fall time are observed from the plasma density measurements using a Langmuir probe. The design details of the fast rise pulsed microwave source are presented in this article with initial experimental results.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2671793