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Description
The KEK-ATF is an R&D facility for the final focus system to develop nanometer beam technology for the International Linear Collider. The vertical beam size growth as a function of bunch intensity has been observed at the focal point (IP), mainly caused by wakefield effects. ATF provides an excellent environment for studying wakefield impacts on nanometer-scale beams. Mitigation and understanding of wakefield effects are important for achieving stable nanometer beams. To reduce wakefield effects, several upgrades have been implemented in the ATF final focus beamline. Vacuum components that significantly affect the beam, such as flanges and bellows, have been improved by introducing step-free structures and RF shielding. In addition, the collimator, one of the dominant wakefield sources, has been upgraded to allow position adjustment, enabling minimization of wakefield effects caused by orbit distrtions and misalignments. In this paper, we report the current status of these mitigation studies, their experimental results, and future prospects toward stable nanometer beam operation.
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