Speaker
Description
Dielectric-lined waveguides are a promising platform for high-gradient beam-driven dielectric wakefield acceleration (DWFA). We present experimental results from a recent study at the Argonne Wakefield Accelerator (AWA), focusing on the performance of three copper-coated dielectric structures with distinct cross-sections: circular, rectangular, and square. These geometries enable a comparative evaluation of the accelerating gradients and wakefield characteristics supported by each configuration. A key feature of this experiment is the use of a "loading bunch" to suppress the wakefield, demonstrating active control of energy transfer along the beam path. To directly measure wakefield suppression, a circular structure with an angled downstream cut was used to redirect coherent Cherenkov radiation into an autocorrelator for temporal diagnostics. Accelerating gradients were measured using a single-shot longitudinal phase space diagnostic, providing insight into geometry-dependent wakefield behavior. These results support future structure optimization efforts and advance experimental techniques for wakefield control in dielectric-based acceleration.
Funding Agency
U.S. DOE Contract No. DE-AC02-06CH11357 with ANL and award No. DE-SC0022010 to NIU.
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