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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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Published on: June 25, 2021

Multipactor experiments on an S-band coaxial test cell.

Stephen V Langellotti¹, Nicholas M Jordan¹, Y Y Lau¹

¹Plasma, Pulsed Power and Microwave Laboratory, Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, Michigan 48109-02104, USA.

The Review of Scientific Instruments

|January 1, 2022

Summary

Radio frequency vacuum electronics face multipactor discharges, which can damage devices. A new test cell successfully scaled these experiments to higher frequencies, validating simulation predictions and showing self-conditioning effects.

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Area of Science:

Physics
Electrical Engineering
Materials Science

Background:

Radio frequency (RF) vacuum electronics are susceptible to multipactor discharges.
These discharges, caused by secondary electron emission, can disrupt and damage sensitive electronic devices.
Multipactor discharges are a critical concern in high-power RF systems, including satellite communications.

Purpose of the Study:

To present results from a novel S-band coaxial multipactor test cell.
To demonstrate the capability of this test cell to scale multipactor experiments to higher frequencies.
To validate simulated predictions of multipactor breakdown thresholds and characterize self-conditioning effects.

Main Methods:

Development and utilization of a new S-band coaxial multipactor test cell.
Conducting experiments at 3.05 GHz to investigate multipactor discharges.
Comparing experimental breakdown thresholds with prior simulation results.
Characterizing the phenomenon of multipactor self-conditioning.

Main Results:

The test cell successfully scaled coaxial multipactor experiments to 3.05 GHz, significantly higher than previous studies.
Experimental multipactor breakdown thresholds closely matched simulated predictions.
The significant impact of multipactor self-conditioning was experimentally demonstrated and characterized.

Conclusions:

The new S-band coaxial test cell is a viable tool for studying multipactor discharges at higher frequencies.
Experimental results validate the accuracy of multipactor simulation models.
Further research using this test cell will focus on developing effective multipactor mitigation strategies.