7–11 Sept 2025
Teaching Hub 502
Europe/London timezone

Development of Wall Current Monitor on FETS-FFA Test Ring

MOPMO39
8 Sept 2025, 16:00
2h
Mountford Hall, Liverpool Guild of Students

Mountford Hall, Liverpool Guild of Students

University of Liverpool
Poster Presentation MC01: Beam Charge and Current Monitors MOPMO

Speaker

Emi Yamakawa (Science and Technology Facilities Council)

Description

Conceptual design studies of the FETS-FFA demonstration ring have been actively performed to confirm the reliability of a Fixed Field Alternating gradient (FFA) accelerator for a future high-power spallation neutron source, called ISIS-II. A wall Current Monitor (WCM) is a choice of non-destructive intensity monitor to evaluate the circulating proton beams from 3 MeV (about 1MHz in revolution frequency) to 12 MeV(about 2MHz in revolution frequency) in the FETS-FFA test ring. As the beam orbit shifts radially with beam energy in FFAs, the aperture of FETS-FFA WCM will be about 700mm horizontally. The maximum mean circulating beam current is about 100mA and tomographic and Schottky measurements require a bandwidth of 370MHz (100 harmonics). This is a challenge for such a large monitor. A half-width demonstration WCM (demo-WCM) was designed and manufactured to benchmark numerical simulations and to understand monitor responses. Whilst measured frequency band was lower than expected, 1% intensity resolution was achieved in the demo-WCM. In this paper, the detail design study as well as the signal response of the demo-WCM will be presented.

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Author

Emi Yamakawa (Science and Technology Facilities Council)

Co-authors

Ian Gardner (Science and Technology Facilities Council) Khalid Fazlee (Science and Technology Facilities Council)

Presentation materials

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