18–26 Sept 2025
Ito International Research Center
Asia/Tokyo timezone

In-situ plasma processing on low-beta cavities at the Argonne Tandem Linac Accelerator System (ATLAS)

TUP44
23 Sept 2025, 14:30
3h
Ito International Research Center

Ito International Research Center

Tokyo
Board: TUP44
Student Poster Presentation MC3: Cavities Tuesday Poster Session

Speakers

Megan McIntyre (Argonne National Laboratory, DePaul University) Michael Kelly (Argonne National Laboratory)

Description

A method to enhance ATLAS low-beta superconducting cavities has been developed at Argonne National Laboratory in collaboration with MSU/FRIB, Fermilab, IJCLab, JLab, and BNL. At the center of the accelerator, a cryostat containing seven 72 MHz QWR installed in 2014 has world-leading performance for ion linacs at v/c~0.1, though performance has been reduced by ~20 % over the past decade due to contaminants. ATLAS operates over 6000 hours annually with a winter maintenance period, during which we aim to recover cavity performance through in-situ plasma processing. Cold testing on a spare 72 MHz QWR before and after fundamental mode plasma processing, using the real ATLAS coupler and an 80:20 Ar/O2 gas mixture, demonstrates remarkable improvements. We present experimental results of plasma processing on the spare cavity in both bench-top test and realistic test-cryostat environments. We include a system developed to prevent plasma formation in the coupler port.

I have read and accept the Privacy Policy Statement Yes

Author

Megan McIntyre (Argonne National Laboratory, DePaul University)

Co-authors

Deeksha Sinha (Northern Illinois University) Gary Zinkann (Argonne National Laboratory) Michael Kelly (Argonne National Laboratory) Milica Samardzic (Georgia Institute of Technology) Troy Petersen (Argonne National Laboratory)

Presentation materials

There are no materials yet.