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A V Arzhannikov^1,2, N S Ginzburg³, P V Kalinin^1,2

¹Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia.

Physical Review Letters

|September 24, 2016

Summary

Researchers developed a 75 GHz free-electron maser using a hybrid resonator and two electron beams. This design achieved stable, narrow-band generation of spatially coherent radiation with high output power.

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Area of Science:

Physics
Quantum Electronics
Plasma Physics

Background:

Free-electron masers (FEMs) are crucial for generating high-power coherent radiation.
Oversized interaction spaces in FEMs often present challenges for stable operation and mode control.
Hybrid resonators offer potential for improved performance in high-frequency devices.

Purpose of the Study:

To design and elaborate a spatially extended planar 75 GHz free-electron maser.
To investigate the use of a hybrid two-mirror resonator with 2D and 1D Bragg reflectors.
To achieve stable, narrow-band generation and spatially coherent radiation using parallel-sheet electron beams.

Main Methods:

Utilized a hybrid two-mirror resonator comprising 2D upstream and 1D downstream Bragg reflectors.
Employed two parallel-sheet electron beams (0.8 MeV, 1 kA) for maser excitation.
Operated within a highly oversized interaction space (45 × 2.5 vacuum wavelengths).

Main Results:

Achieved stable, narrow-band generation due to 2D distributed feedback in the oversized interaction space.
Successfully synchronized the emission from both electron beams.
Obtained spatially coherent radiation with output power of 30-50 MW and pulse duration of ~100 ns per channel.

Conclusions:

The hybrid resonator design effectively enables stable operation in oversized interaction spaces.
2D distributed feedback is key to achieving synchronized, narrow-band emission.
The developed 75 GHz free-electron maser demonstrates a promising approach for high-power coherent radiation generation.