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

Current status of developing pepper-pot emittance monitor for high-intensity ion beam

TUPMO19
9 Sept 2025, 16:00
2h
Mountford Hall, Liverpool Guild of Students

Mountford Hall, Liverpool Guild of Students

Liverpool Guild of Students, University of Liverpool
Poster Presentation MC04: Transverse Profile and Emittance Monitors TUPMO

Speaker

YASUTERU KOTAKA (The University of Tokyo)

Description

The experiment to measure the Electric Dipole Moment (EDM) of Francium (Fr) is in progress by Center for Nuclear Study (CNS), UTokyo. Fr is produced via a nuclear fusion reaction by bombarding a gold target with oxygen-18 beam, requiring a beam intensity of 18 eμA or higher. However, the transport efficiency of the current beam line decreases to 66 % when the beam intensity exceeds 10 eμA. To address this issue, we are developing a pepper-pot emittance monitor (PEM) optimized for high-intensity beams. The improvements include locating the camera far from the beam line to minimize radiation damage, achieving a distance 4.1 m while maintaining the position error of 0.13 mm. Additionally, we conducted beam tests to verify measurement errors and found the results were consistent with the measurement errors estimated from the PEM structure. Furthermore, the beam shutter time 0.27 was estimated to be acceptable up to the beam power 1000 W to prevent PEM overheating.

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Author

YASUTERU KOTAKA (The University of Tokyo)

Co-authors

Hiroyuki Matsuzaki (The University of Tokyo) Jun-ichi Ohnishi (RIKEN Nishina Center) Keita Kamakura (The University of Tokyo) Yasuhiro Sakemi (The University of Tokyo)

Presentation materials

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