English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

SuperKEKB is the e-/e+ collider which targets the world highest luminosity.In recent operation, SuperKEKB achieved a new world record of $4.71\times10^{34} cm^{-2}s^{-1}$ for luminosity with the beam current of 1.4 A. In thefuture, the beam current will be increased further to aim at the design valueof 3.6 A and much higher luminosity. The RF system consists of 38 cavities (30klystron stations), which share the huge beam loading brought by high currentbeam with each other cavities. For beam stability and power efficiency, it isimportant to distribute the beam loading properly among RF cavities. It isequivalent to adjust the acceleration phase of each cavity. However, it isdifficult to evaluate the acceleration phase using only the pickup signal.Therefore, we established a method to evaluate the beam loading balance amongRF stations from the RF power measurement for each cavity, and to adjust theacceleration phase. This report introduces the method for evaluating andoptimizing the beam loading (acceleration phase) among stations in SuperKEKB,which has a large number of RF stations, and its operation.

Optimization of RF phase and beam loading distribution among RF stations in SuperKEKB