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SuperKEKB

SuperKEKB[1] is a particle collider located at KEK (High Energy Accelerator Research Organisation) in Tsukuba, Ibaraki Prefecture, Japan. SuperKEKB collides electrons with positrons at the centre-of-momentum energy close to the mass of the Υ(4S) resonance making it a second-generation B-factory for the Belle II experiment. The accelerator is an upgrade to the KEKB accelerator, providing approximately 40 times higher luminosity,[2] due mostly to superconducting quadrupole focusing magnets.[1] The accelerator achieved "first turns" (first circulation of electron and positron beams) in February 2016.[3] First collisions occurred on 26 April 2018.[4] At 20:34 on 15 June 2020, SuperKEKB achieved the world’s highest instantaneous luminosity for a colliding-beam accelerator, setting a record of 2.22×1034 cm−2s−1.[5]

  1. ^ a b Ohnishi, Yukiyoshi; Abe, Tetsuo; Adachi, Toshikazu; Akai, Kazunori; Arimoto, Yasushi; Ebihara, Kiyokazu; Egawa, Kazumi; Flanagan, John; Fukuma, Hitoshi (1 January 2013). "Accelerator design at SuperKEKB". Progress of Theoretical and Experimental Physics. 2013 (3): 3A011. Bibcode:2013PTEP.2013cA011O. doi:10.1093/ptep/pts083.
  2. ^ "SuperKEKB". www-superkekb.kek.jp. Retrieved 21 May 2017.
  3. ^ "Congratulations to SuperKEKB for "first turns" | CERN". home.cern. Retrieved 21 May 2017.
  4. ^ "Electrons and Positrons Collide for the first time in the SuperKEKB Accelerator". kek.jp. Retrieved 26 April 2018.
  5. ^ "SuperKEKB collider achieves the world's highest luminosity". kek.jp. Retrieved 26 June 2020.

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