Speaker
Description
The nano-beam scheme allows the vertical beta function at the interaction point (IP) to be much smaller than the bunch length. The vertical beta function and the beam size at the collision point realized at SuperKEKB are the smallest in the world among colliders. As the result, the luminosity can be achieved higher than conventional colliders utilize a head-on collision or a smaller crossing-angle collision scheme. However, the optics-tuning becomes more difficult as squeezing the beta function at the IP. Those difficulties come from imperfection of fabrication, discrepancy between the model and the real machine, and time-dependent drifting of the machine condition due to environmental changes. We present limitations of the optics tuning at SuperKEKB and lessons learned from recent operations.
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