2022/10/11 by S. Ogasawara, K. Akai, Ogasawara, S. +7
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics
paper · pdf · doi:10.48550/arxiv.2210.05100
openalex publication_date 2022/10/11 · openalex created_date 2022/10/14 · openalex updated_date 2026/07/28
SuperKEKB is the e-/e+ collider which targets the world highest luminosity. In recent operation, SuperKEKB achieved a new world record of 4.71× 1034 cm-2s-1 for luminosity with the beam current of 1.4 A. In the future, the beam current will be increased further to aim at the design value of 3.6 A and much higher luminosity. The RF system consists of 38 cavities (30 klystron stations), which share the huge beam loading brought by high current beam with each other cavities. For beam stability and power efficiency, it is important to distribute the beam loading properly among RF cavities. It is equivalent to adjust the acceleration phase of each cavity. However, it is difficult to evaluate the acceleration phase using only the pickup signal. Therefore, we established a method to evaluate the beam loading balance among RF stations from the RF power measurement for each cavity, and to adjust the acceleration phase. This report introduces the method for evaluating and optimizing the beam loading (acceleration phase) among stations in SuperKEKB, which has a large number of RF stations, and its operation.