Crab cavity

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Use of crab cavities in particle accelerators to rotate the rotating particle packets in front of the collision point. In this way, better penetration and thus a higher rate of particle collisions is achieved.

Crab Cavities ( engl. Crab , shrimp 'and cavity , the cavity') are special cavity resonators , which in particle accelerators can be employed to the luminosity and thus the rate of increase in particle collisions.

In synchrotrons and high-energy linear accelerators , the particles are not accelerated as a continuous beam, but in individual packages (“bunches”). These packages are very elongated and thin. In the case of collision points in particle detectors , for technical reasons the beams have to cross at a small angle instead of meeting each other frontally, so the particle bunches do not penetrate each other completely. Crab cavities have a rapidly oscillating electromagnetic field that deflects the front part of the particle in a different direction than the rear part. This allows the particle bunches to be rotated slightly so that they penetrate each other completely at the point of collision.

Crab cavities were used at the accelerator KEKB and will be built into its successor SuperKEKB . They are also planned to be used on the Large Hadron Collider and International Linear Collider .

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