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Description
The FCC-ee injector design requires operation with relatively long, high-charge bunches, conditions that enhance the influence of transverse wakefields on beam dynamics. A critical aspect of the future electron–positron collider design is the mitigation of transverse beam jitter both along the FCC-ee linacs and at their exit. The most common approach to suppress such jitter is the Balakin–Novokhatsky–Smirnov (BNS) damping technique. Although widely implemented, BNS damping has limitations in terms of beam-quality preservation and acceleration efficiency, primarily because it requires operating a significant fraction of the accelerating structures off-crest. We have identified an alternative technique that leverages the underlying BNS damping mechanism while avoiding its main drawbacks [1]. The FACET-II linacs offer a unique opportunity to test this approach experimentally, as they can operate with beam parameters similar to those expected in the FCC-ee linacs. This makes FACET-II an ideal facility to validate the damping mechanism observed in simulations. We present studies aimed at measuring jitter amplification under various conditions, including different phase advances per cell, bunch lengths, and—time permitting—bunch charges. These measurements constitute a key validation step for the FCC-ee pre-injector design.
Footnotes
Reference
[1] S. Bettoni, A. Latina, A. Grudiev, “Transverse beam jitter damping along the Future Circular Collider e + e− injector linacs”, Phys. Rev. Accel. Beams 28, 061601 (2025).
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