22–26 Aug 2022
Trieste Convention Centre
Europe/Zurich timezone

Laser-Induced Gas Breakdown at KU-FEL

MOP28
22 Aug 2022, 16:00
1h 30m
Exhibition Hall (Trieste Convention Centre)

Exhibition Hall

Trieste Convention Centre

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Speaker

Ryoichi Hajima (National Institutes for Quantum and Radiological Science and Technology)

Description

Laser-induced breakdown has been observed in various combination of gases and lasers. It is known from previous studies that breakdown occurs when the number of electrons exceeds a threshold value through the following stages: generation of seed electrons, acceleration of electrons by inverse Bremsstrahlung, and avalanche multiplication of electrons by impact ionization.
We have observed laser-induced breakdown of gases at KU-FEL, the FEL oscillator at Kyoto University. In the thermionic cathode mode (2856 MHz repetition rate, 10 um), breakdown was observed in air, nitrogen, and argon, while no discharge was observed in the photocathode mode operation (29.75 MHz, 9 um). The difference in the two operation modes can be explained by the diffusion of electrons between the micropulses.
This work was supported by MEXT Q-LEAP (JPMXS0118070271), IAE ZE Research Program (ZE2022B-23) and JSPS KAKENHI (22H03881).

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Primary authors

Ryoichi Hajima (National Institutes for Quantum and Radiological Science and Technology) Hideaki Ohgaki (Kyoto University) Heishun Zen (Kyoto University)

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