Experimental Studies on Grooved Surfaces to Suppress Secondary Electron Emission

Conference · Tue Jun 15 00:00:00 EDT 2010 · Conf.Proc.C100523:tupd043,2010

OSTI ID:982079

Suetsugu, Y.; Fukuma, H.; Shibata, K.; Pivi, M.; Wang, L.

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{sup o}, 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.

• Research Organization: SLAC National Accelerator Laboratory (SLAC)
• Sponsoring Organization: US DOE Office of Science (DOE SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 982079
• Report Number(s): SLAC-PUB-14124
• Conference Information: Journal Name: Conf.Proc.C100523:tupd043,2010
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
ACCPHY
ENG
PHYS
CLOUDS
ELECTRON BEAMS
ELECTRON DENSITY
ELECTRON EMISSION
ELECTRONS
MAGNETIC FIELDS
POSITRONS
STORAGE RINGS
WIGGLER MAGNETS