Speaker
Description
Beam-Based Alignment studies are fundamental for ensuring accurate beam transport along the linac up to the plasma stage. Misalignments of quadrupoles and RF accelerating structures can induce trajectory distortions, leading to emittance dilution and enhanced susceptibility to wakefields. Proper identification, modeling, and correction of these misalignments are therefore critical to preserving beam quality. In plasma acceleration, tolerance to transverse misalignment becomes even more stringent. Minimizing the relative centroid offset between the drive beam and the witness beam is essential to mitigate the onset and growth of hose instability, which can degrade the uniformity of the generated wakefields and reduce the acceleration efficiency. BBA procedures considering correction techniques are required. Dispersion-Free Steering and Wakefield-Free Steering algorithms have been tested to minimize trajectory deviations and mitigate the impact of short-range wakefields, which represent one of the main limitations in high-gradient X-band linac. Dedicated RF-Track simulations are carried out to quantitatively assess the performance of DFS and WFS in mitigating wakefield-induced orbit distortions and alignment-related errors along the beamline. The numerical studies indicate that both correction schemes substantially suppress emittance growth and mitigate the transverse centroid offset under realistic misalignment scenarios.
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