SRF2013 - List of Authors (Matsumoto, T.)

Paper

Title

Page

Demonstration of RF Stabilities in STF 9-cell Cavities Aiming for the Near Quench Limit Operation

865

M. Omet
Sokendai, Ibaraki, Japan
T. Matsumoto, S. Michizono, T. Miura
KEK, Ibaraki, Japan

In preparation of ILC an operation of two superconducting cavities controlled by digital LLRF techniques at different gradients (16 MV/m, 24 MV/m) with flat flattops and a 6.4 mA beam was demonstrated, which is only possible by PkQL control (individual setting of driving power and loaded Q per cavity). The vector sum stabilities were ΔA/A = 0.009%rms and Δφ = 0.009°rms. Since in ILC the cavity gradient spread is large (31.5 MV/m±20%) the required range of loaded Q values is 3·10⁶ to 10⁷. High loaded Q operation with a 6.1 mA beam at 2·10⁷ was demonstrated. The stabilities were ΔA/A = 0.008%rms and Δφ = 0.014°rms. Furthermore a near klystron operation within 5% of saturation was performed with a 6.2 mA beam. The stabilities were ΔA/A = 0.010%rms and Δφ = 0.009°rms.

Slides THIOC04 [1.448 MB]

Paper	Title	Page
THIOC04	Demonstration of RF Stabilities in STF 9-cell Cavities Aiming for the Near Quench Limit Operation	865
	M. Omet Sokendai, Ibaraki, Japan T. Matsumoto, S. Michizono, T. Miura KEK, Ibaraki, Japan
	In preparation of ILC an operation of two superconducting cavities controlled by digital LLRF techniques at different gradients (16 MV/m, 24 MV/m) with flat flattops and a 6.4 mA beam was demonstrated, which is only possible by PkQL control (individual setting of driving power and loaded Q per cavity). The vector sum stabilities were ΔA/A = 0.009%rms and Δφ = 0.009°rms. Since in ILC the cavity gradient spread is large (31.5 MV/m±20%) the required range of loaded Q values is 3·10⁶ to 10⁷. High loaded Q operation with a 6.1 mA beam at 2·10⁷ was demonstrated. The stabilities were ΔA/A = 0.008%rms and Δφ = 0.014°rms. Furthermore a near klystron operation within 5% of saturation was performed with a 6.2 mA beam. The stabilities were ΔA/A = 0.010%rms and Δφ = 0.009°rms.
	Slides THIOC04 [1.448 MB]