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Belle II - VR Supercollider
Belle II - VR Supercollider
From 1998 to 2010, KEK, the Japanese High-Energy Accelerator Research Organisation, operated KEKB, a 3 km circumference asymmetric electron-positron collider thereby reaching the world record in instantaneous luminosity of 2.1x1034 cm–2s-1. The beam energies were chosen so that in the collisions large numbers of B-anti-B meson pairs were produced, and hence the facility is also known as a B factory.
The SuperKEKB accelerator, a major upgrade of KEKB, is designed to achieve a peak luminosity a factor of forty times higher. The Belle II experiment is designed to record data at SuperKEKB, with a performance similar or better than Belle or BaBar, the B factory detectors, in a much more severe beam background environment.
The B-factory experiments observed the first large signals for CP violation (matter-antimatter asymmetries) in the B meson sector in 2001. These results demonstrated Kobayashi and Maskawa's hypothesis for the origin of the CP violation is correct and provided the experimental foundation for their 2008 Nobel Prize in Physics. Belle II, the first super B-Factory experiment, is designed to find NP (New Physics) beyond the Standard Model of particle physics.
The Belle II detector is a general purpose spectrometer for the next-generation B-factory experiment at KEK. The Belle II efficiently collects data of e+e- collisions made by the SuperKEKB accelerator. The Belle II consists of several sub-detector components:
two layers of pixelated silicon sensors (PXD) and four layers of double-sided silicon strip sensors (SVD) that measure decay vertex positions of B mesons and other particles,
a central drift chamber (CDC) that measures trajectories, momenta and dE/dx information of charged particles,
a barrel-shaped array of Time-Of-Propagation (TOP) counters that reconstruct, in spacial and time coordinates, the ring-image of Cherenkov light cones emitted from charged particles passing through quartz radiator bars, another ring-imaging Cherenkov counters with aerogel radiator in the forward end-cap (A-RICH),
an electromagnetic calorimeter (ECL) comprised of scintillator crystals located inside a superconducting solenoid coil that provides a 1.5 Tesla magnetic field, and
an iron flux-return located outside of the coil which is instrumented to detect K0L mesons and to identify muons (KLM).
There are other tasks essential for the detector:
a fast and reliable trigger (TRG) and data acquisition system (DAQ) records collision events of interest,
stable operation of superconducting solenoid magnet,
a globally-distributed computing and data-storage system and organized effort on various levels of software that work on the computer (Soft/Comp),
an arrangement of components around the Interaction Region (IR), such as beam pipes and final focusing magnets, which directly impacts the amoung of beam backgrounds, and
an integrated effort on the mechanical structure design (STR).
Additional Belle II Resources:
Additional Belle II Resources:
Belle II Twitter Feed: @belle2collab
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Belle II Geometry Files (can be used in other applications)
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