Suppression of Secondary Electron Emission using Triangular Grooved Surface in the ILC Dipole and Wiggler Magnets

Conference · Fri Jul 06 04:00:00 EDT 2007 · Conf.Proc.C070625:4234,2007

OSTI ID:909537

Wang, L; Bane, K; Chen, C; Himel, T; Munro, M; Pivi, M; Raubenheimer, T; Stupakov, G

The development of an electron cloud in the vacuum chambers of high intensity positron and proton storage rings may limit machine performance. The suppression of electrons in a magnet is a challenge for the positron damping ring of the International Linear Collider (ILC) as well as the Large Hadron Collider. Simulation show that grooved surfaces can significantly reduce the electron yield in a magnet. Some of the secondary electrons emitted from the grooved surface return to the surface within a few gyrations, resulting in a low effective secondary electron yield (SEY) of below 1.0 A triangular surface is an effective, technologically attractive mitigation with a low SEY and a weak dependence on the scale of the corrugations and the external magnetic field. A chamber with triangular grooved surface is proposed for the dipole and wiggler sections of the ILC and will be tested in KEKB in 2007. The strategy of electron cloud control in ILC and the optimization of the grooved chamber such as the SEY, impedance as well as the manufacturing of the chamber, are also discussed.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 909537
• Report Number(s): SLAC-PUB-12641
• Conference Information: Journal Name: Conf.Proc.C070625:4234,2007
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
ACCPHY
CLOUDS
DAMPING
DIPOLES
ELECTRON EMISSION
ELECTRONS
HADRONS
IMPEDANCE
LINEAR COLLIDERS
MAGNETIC FIELDS
MAGNETS
MITIGATION
OPTIMIZATION
POSITRONS
PROTONS
SIMULATION
STORAGE RINGS
WIGGLER MAGNETS