Speaker
Mika Masuzawa
(KEK)
Description
SuperKEKB is an asymmetric-energy electron positron collider based on the “nanobeam scheme”, where two low emittance beams collide with a large crossing angle at the interaction point(IP). The design beam size in the vertical direction at IP is 50-60nm, which is similar to that of COVID-19 virus. Deformation of the tunnel has been observed since the construction of SuperKEKB’s predecessor accelerator KEKB. Magnet motion, including that of the cryostat of the superconducting final focusing magnets can be crutial for collisions by such small beams. Survey data of the tunnel level marker accumulated over 20 years will be presented. The motions of magnets and cryostat will also be presented.
Author
Mika Masuzawa
(KEK)
