Speaker
Description
The SuperKEKB is a high-luminosity electron-positron collider where a “nanobeam collision scheme” is utilized to achieve an unprecedented high luminosity. Its luminosity performance had gradually improved, achieving a peak luminosity of 4.7e34 cm-2s-1 in June 2022. While making steady progress, it was found that the SuperKEKB encountered some challenges as a luminosity frontier machine such as short beam lifetime, severe beam instabilities including sudden beam loss, and low injection efficiency. To overcome these challenges, we had a long shutdown from July 2022 to January 2024 to perform many upgrades including construction of a non-linear collimation system, modification of injection point, and additional radiation shielding at the interaction region. Commissioning has just resumed in January 2024, and it is expected that many fruitful results will be obtained during this beam operation that will serve as a good reference for future colliders.
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