Speaker
Description
SuperKEKB is an electron-positron double-ring B-factory machine, which aims to achieve a peak luminosity 40 times higher than that of KEKB by using the “nano-beam” scheme.
A major upgrade to the Main Ring magnet system was needed in order to realize this scheme. Approximately 2600 magnets were aligned, using ~1200 reference points in the tunnel.
Commissioning of the SuperKEKB main ring started in February, 2016. The circumference as measured by the beam agreed with the prediction from analysis of alignment data to within 1 ppm.
The circumference difference between two rings was found to be approximately a few hundred microns over ~3 km.
The good alignment of the main ring magnets contributed to the smooth start up of the SuperKEKB beam commissioning. The alignment strategy and results will be presented in this report.
