Crab cavity
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 .
Web links
- Crabbing in the cavity , report on linearcollider.org (English)
literature
- Rama Calaga, Steve Myers, Frank Zimmermann (Eds.): Summery of the 4th LHC Crab Cavity Workshop “LHC-CC10” (CERN December 15-17, 2010). (PDF; 245 kB) CERN, Geneva 2011 (CERN-ATS-2011-003).
- K. Hosoyama et al .: Crab Cavity Development. (PDF; 993 kB) In: Proceedings of the 12th International Workshop RF superconductivity. 10-15 July 2005, Ithaca, USA, pp. 439-445 (THA09).
- H. Nakai et al .: Research and Development Program on Superconducting Crab Cavities for KEKB. (PDF; 248 kB) In: Proceedings of the 11th Workshop on RF Superconductivity. 8-12 September 2003, Lübeck / Travemünde, Germany, pp. 120-123 (MPO34).