2012•Presented atRequires access

SuperKEKB Injector Upgrade for High Charge and Low Emittance Electron Beam

N. Iida, L. Zang, Mitsuhiro Yoshida, Masayuki Satō, Y. Ogawa

Abstract

The design strategy of SuperKEKB is based on the. nano-beam scheme. The dynamic aperture decreases due to the very small beta function at the interaction point. Thus the injector upgrade is required to obtain the low emittance and high charge beam corresponding to the short beam life and small injection acceptance. The required beam parameters are 5 nC, 20 mm mrad and 4 nC, 6 mm mrad for the electron and positron respectively. For the electron beam, new photocathode RF-Gun with the focusing electric field was installed. Further the emittance growth in the LINAC is an important issue for the low emittance injection. We will report the machine study of the RF-Gun and the emittance growth through the LINAC.

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Key concepts: Thermal emittance, Linear particle accelerator, Electron gun, Beam (structure), Photocathode, Optics, Injector, Physics