Speaker
Description
At the Center for Nuclear Study, The University of Tokyo, the experiments to measure the Electric Dipole Moment (EDM) of Francium is in progress. Francium is produced via a nuclear fusion reaction by bombarding a gold target with an oxygen-18 ion beam, requiring a beam intensity of 18 eμA or higher. However, the current beamline's transport efficiency decreases to approximately 66 % when the beam intensity exceeds 10 eμA. To address this issue, we have developed a pepper-pot emittance monitor (PEM) optimized for high-intensity beams. The improvements include positioning the camera farther from the beamline to minimize radiation damage, achieving a distance of 4.1 m – double the previous setup – while maintaining an image position accuracy of 0.15 mm. Additionally, we conducted beam tests using two types of PEMs at the Micro Analysis Laboratory, Tandem Accelerator, University of Tokyo, and confirmed that the results from both devices were consistent with the estimated measurement accuracy. Furthermore, to prevent overheating of the PEM, a beam shutter system was implemented, enabling a measurement time of just 0.27 seconds.
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