Speaker
Description
High-precision mass spectroscopy of $\Lambda$-hypernuclei is currently underway at the Thomas Jefferson National Accelerator Facility (JLab). To achieve the world's highest mass resolution of $500\text{ keV}$ (FWHM), minimizing the energy spread of the $2.2\text{ GeV}$ incident electron beam is crucial. As a method for simultaneous and continuous monitoring of this energy spread, we have developed a "synchrotron light interferometry" system. In this method, synchrotron radiation emitted from a bending magnet is observed using double-slit interferometry. The beam size, which is approximately $200\ \mu\text{m}$, can be estimated from the visibility of the interference fringes. Because this measurement is performed in a high-dispersion region of the beamline, the beam size is primarily determined by the dispersion and momentum spread.
Continuous measurements have commenced this summer, and we plan to calibrate the beam size measurements in conjunction with the wire-scan method prior to the hypernuclear experiment scheduled for 2029. In this presentation, we report on the current status of preparations, focusing on the optimization of the experimental setup, including the beam optics and the optical system for synchrotron radiation observation. Furthermore, we discuss future prospects for the system, including plans to develop an automated gang phase control utilizing the SLI to minimize energy spread.
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