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In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

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Published on: June 13, 2020

Waveguide transition with vacuum window for multiband dynamic nuclear polarization systems.

Oleksandr Rybalko¹, Sean Bowen¹, Vitaliy Zhurbenko¹

¹Technical University of Denmark, Ørsteds Plads 349, 2800 Kgs. Lyngby, Denmark.

The Review of Scientific Instruments

|June 3, 2016

Summary

This summary is machine-generated.

This study presents a compact, low-loss waveguide transition and broadband microwave vacuum window for multiband Dynamic Nuclear Polarization (DNP) systems, demonstrating its effectiveness at 94, 140, and 188 GHz.

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Area of Science:

Physics
Engineering
Materials Science

Background:

Dynamic Nuclear Polarization (DNP) systems require efficient microwave delivery across multiple frequency bands.
Existing microwave vacuum windows are often single-band, limiting the flexibility of DNP systems.
Compact and broadband solutions are needed for advanced DNP applications.

Purpose of the Study:

To design and optimize a low-loss waveguide transition and an oversized microwave vacuum window for multiband DNP systems.
To evaluate the performance of high-density polyethylene with urethane adhesive as a broadband vacuum window material.
To validate simulation results with experimental testing at 94, 140, and 188 GHz.

Main Methods:

Full-wave electromagnetic simulations were used to optimize the waveguide transition and window design.
Material characterization of high-density polyethylene and urethane adhesive for microwave applications.
Experimental testing of the fabricated window at the target frequencies (94, 140, 188 GHz).

Main Results:

A compact, low-loss waveguide transition optimized for multiband DNP systems was developed.
The oversized microwave vacuum window demonstrated broadband performance exceeding commercially available single-band options.
High-density polyethylene with urethane adhesive proved to be a suitable low-loss material for multiband vacuum windows.
Simulation results were successfully verified through experimental measurements.

Conclusions:

The developed waveguide transition and vacuum window assembly is effective for multiband DNP systems.
This broadband window design offers enhanced flexibility and performance for DNP applications.
The findings support the use of specific materials for efficient microwave vacuum windows in advanced scientific instruments.