SuperKEKB

<p>SuperKEKB is a <a href="/facts/Particle_collider/j6wTDohV">particle collider</a> located at <a href="/facts/KEK/nxaKEVIL">KEK</a> (<i>High Energy Accelerator Research Organisation</i>) in <a href="/facts/Tsukuba%2c_Ibaraki/0Juuaxe7">Tsukuba</a>, <a href="/facts/Ibaraki_Prefecture/NHAGk68w">Ibaraki Prefecture</a>, <a href="/facts/Japan/U5mz0SRT">Japan</a>. SuperKEKB collides <a href="/facts/Electron/L0KBo5cW">electrons</a> with <a href="/facts/Positron/HgV4zBzA">positrons</a> at the centre-of-momentum energy close to the mass of the <a href="/facts/Upsilon_meson/Ap9wz1cs">Υ(4S)</a> <a href="/facts/Resonance_(particle_physics)/aBEXCbzT">resonance</a> making it a second-generation <a href="/facts/B-factory/NJUkVHbs">B-factory</a> for the <a href="/facts/Belle_II_experiment/g2LR1aUT">Belle II experiment</a>. The accelerator is an upgrade to the <a href="/facts/KEKB_(accelerator)/48hpnl52">KEKB</a> accelerator, providing approximately 40 times higher <a href="/facts/Luminosity_(scattering_theory)/E6dFeWbW">luminosity</a>, due mostly to <a href="/facts/Superconducting_magnet/bRWH01s5">superconducting</a> quadrupole focusing magnets. The accelerator achieved "first turns" (first circulation of electron and positron beams) in February 2016. First collisions occurred on 26 April 2018.  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.
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SuperKEKB open-in-new

SuperKEKB