Speaker
Description
SuperKEKB is a 7 GeV electron - 4 GeV positron double-ring circular collider that aims to increase the collision frequency per unit area per second, i.e., luminosity, which is one of the most important parameters for a collider, from the 2.1 × 10^34 cm-2s-1 achieved by the predecessor collider KEKB up to several tens higher luminosity. The high statistics provided by SuperKEKB contribute to the search for new phenomena beyond the Standard Model of particle physics.
The electron and positron rings are placed side by side in a tunnel with a circumference of about 3 km excavated 11m underground. The electrons and positrons collide at one point called Interaction Point (IP). Belle II detector installed at the IP records the huge number of physics reactions produced by the collisions.
Many components are reused from the KEKB accelerator or even earlier the Tristan accelerator in SuperKEKB, though some major design changes are carried out to implement the innovative idea called "nano-beam scheme.” SuperKEKB is the first in the world to realize this "nano-beam scheme".
In 2019, the operation with a fully instrumented Belle II detector began successfully. The peak luminosity of 4.7 × 10^34 cm-2 s-1, which is more than twice the previous KEKB record, was achieved in June 2022, before the first long shutdown (LS1).
SuperKEKB progress and the challenges as a luminosity frontier machine are presented.
