7–12 May 2023
Venice, Italy
Europe/Zurich timezone

Study on the laser treatment of NB and Nb3Sn thin films on copper substrate with a kW nanosecond fiber laser

THPA178
11 May 2023, 16:30
2h
Salone Adriatico

Salone Adriatico

Poster Presentation MC7.T25: Lasers Thursday Poster Session

Speaker

ChangLin Wang (Institute of Modern Physics, Chinese Academy of Sciences)

Description

Surface annealing using intense nanosecond laser pulses is an emerging technique for SRF cavities. This technique can effectively reduce the cavities’ surface defects and improve their RF performance. However, previous studies in this field limited themselves on solid state lasers or gas lasers, which have very low average power and are not practical for processing actual SRF cavities with ~m2 inner surface area. IMP innovatively built a practical whole-cavity processing system with a kW-level nanosecond fiber laser, which is designed to process an SRF cavity within a working day. In this work, the system design and feasibility analysis will be given, together with the comparison between pristine Nb thin film samples on copper substrates and their fiber laser processed counterparts. The results show that our fiber laser system can deliver comparable surface treatment as that from the solid-state laser system, but with higher efficiency. The authors believe such results could boost the application of laser surface annealing technique in the particle accelerator community.

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Primary author

ChangLin Wang (Institute of Modern Physics, Chinese Academy of Sciences)

Co-authors

Qingwei Chu (Institute of Modern Physics, Chinese Academy of Sciences) Teng Tan (Institute of Modern Physics, Chinese Academy of Sciences) Didi Luo (Institute of Modern Physics, Chinese Academy of Sciences) Pingran Xiong (Institute of Modern Physics, Chinese Academy of Sciences)

Presentation materials

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