ICALEPCS2013 - List of Authors (Ichimiya, R.)

Paper

Title

Page

Beam Feedback System Challenges at SuperKEKB Injector Linac

1497

K. Furukawa, R. Ichimiya, M. Iwasaki, H. Kaji, F. Miyahara, T.T. Nakamura, M. Satoh, T. Suwada
KEK, Ibaraki, Japan

SuperKEKB electron/positron asymmetric collider is under construction in order to elucidate new physics beyond the standard model of elementary particle physics. This will be only possible by a precise measurement with 40-times higher luminosity compared with that of KEKB. The injector linac should be upgraded to enable a 20-times smaller beam size of 50 nm at the collision point and twice-larger stored beam current with short lifetime of 10 minutes. At the same time two light source rings, PF and PF-AR, should be filled in top-up injection mode. To this end the linac should be operated with precise beam controls. Dual-layer controls with EPICS and MRF event systems are being enhanced to support precise pulse-to-pulse beam modulation (PPM) at 50Hz. A virtual accelerator (VA) concept is introduced to enable a single linac behaving as four VAs switched by PPM, where each VA corresponds to one of four top-up injections into storage rings. Each VA should be accompanied with independent beam orbit and energy feedback loops to maintain the required beam qualities. The requirements from SuperKEKB HER and LER for beam emittance, energy-spread, and charge are especially challenging.

Slides FRCOBAB04 [1.596 MB]

Paper	Title	Page
FRCOBAB04	Beam Feedback System Challenges at SuperKEKB Injector Linac	1497
	K. Furukawa, R. Ichimiya, M. Iwasaki, H. Kaji, F. Miyahara, T.T. Nakamura, M. Satoh, T. Suwada KEK, Ibaraki, Japan
	SuperKEKB electron/positron asymmetric collider is under construction in order to elucidate new physics beyond the standard model of elementary particle physics. This will be only possible by a precise measurement with 40-times higher luminosity compared with that of KEKB. The injector linac should be upgraded to enable a 20-times smaller beam size of 50 nm at the collision point and twice-larger stored beam current with short lifetime of 10 minutes. At the same time two light source rings, PF and PF-AR, should be filled in top-up injection mode. To this end the linac should be operated with precise beam controls. Dual-layer controls with EPICS and MRF event systems are being enhanced to support precise pulse-to-pulse beam modulation (PPM) at 50Hz. A virtual accelerator (VA) concept is introduced to enable a single linac behaving as four VAs switched by PPM, where each VA corresponds to one of four top-up injections into storage rings. Each VA should be accompanied with independent beam orbit and energy feedback loops to maintain the required beam qualities. The requirements from SuperKEKB HER and LER for beam emittance, energy-spread, and charge are especially challenging.
	Slides FRCOBAB04 [1.596 MB]