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DESIGN STUDY ON KEK INJECTOR LINAC UPGRADE FOR HIGH-CURRENT AND LOW-EMITTANCE BEAMS

Hiroshi Sugimoto, Masanori Satoh, Mitsunobu Yoshida

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Abstract

Injector linac at KEK is now under upgrading to produce high current and low emittance beams to a SuperB factory, named SuperKEKB. Emittance growth resulted from both wakefield and dispersive effects at the linac are troublesome in keeping the beam quality during the acceleration. In this paper, we report recent simulation study for the emittance preservation issue. As a candidate for mitigation of the emittance dilution originated from the transverse wakefield, a bunch compression using an existing bending section is considered. It is demonstrated that the bunch compression remarkably improves the emittance preservation through the linac.

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What this paper is about

Injector linac at KEK is now under upgrading to produce high current and low emittance beams to a SuperB factory, named SuperKEKB. Emittance growth resulted from both wakefield and dispersive effects at the linac are troublesome in keeping the beam quality during the acceleration. In this paper, we report recent simulation study for the emittance preservation issue. As a candidate for mitigation of the emittance dilution originated from the transverse wakefield, a bunch compression using an existing bending section is considered. It is demonstrated that the bunch compression remarkably improves the emittance preservation through the linac.

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Available abstract

Injector linac at KEK is now under upgrading to produce high current and low emittance beams to a SuperB factory, named SuperKEKB. Emittance growth resulted from both wakefield and dispersive effects at the linac are troublesome in keeping the beam quality during the acceleration. In this paper, we report recent simulation study for the emittance preservation issue. As a candidate for mitigation of the emittance dilution originated from the transverse wakefield, a bunch compression using an existing bending section is considered. It is demonstrated that the bunch compression remarkably improves the emittance preservation through the linac.

Key concepts: Thermal emittance, Linear particle accelerator, Upgrade, Physics, Injector, Beam (structure), Beam emittance, Particle accelerator

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