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SLAC Publication: SLAC-PUB-14124
SLAC Release Date: June 15, 2010
Experimental Studies on Grooved Surfaces to Suppress Secondary Electron Emission
Suetsugu, Yusuke.
Grooved surfaces are effective to suppress the secondary electron emission, and can be a promising technique to mitigate the electron cloud effect in positron/proton storage rings. Aiming for the application in a dipole-type magnetic field, various shapes of triangular grooved surfaces have been studied at KEK. The grooves tested here have vertex angles of 20−30, depths of 2.5−5.0 mm, and vertex roundness of 0.05−0.2 mm. In a laboratory, the secondary electron yields (S... Show Full Abstract
Grooved surfaces are effective to suppress the secondary electron emission, and can be a promising technique to mitigate the electron cloud effect in positron/proton storage rings. Aiming for the application in a dipole-type magnetic field, various shapes of triangular grooved surfaces have been studied at KEK. The grooves tested here have vertex angles of 20−30, depths of 2.5−5.0 mm, and vertex roundness of 0.05−0.2 mm. In a laboratory, the secondary electron yields (SEY) of small test pieces were measured using an electron beam in a magnetic-free condition. The grooved surfaces clearly had low SEY compared to flat surfaces of the same materials. The grooves with sharper vertexes had smaller SEY. A test chamber installed in a wiggler magnet of the KEKB positron ring was used to investigate the efficacy of the grooved surface in a strong magnetic field. In the chamber, a remarkable reduction in the electron density around the beam orbit was observed compared to the case of a flat surface with TiN coating. Show Partial Abstract
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  • Interest Categories: Accelerator Physics, Engineering, General Physics, Other Physics