Paper  Title  Page 

WEA3I1  Synchronous Phases and Transit Time Factor  241 


Synchronous phases (¿s) and transit time factors (T) are THE key parameters for linac designs and operations. While the couple (¿s, T) is still our way of thinking the longitudinal beam dynamics, it is important to have in mind that the original ¿Panofsky¿ definition of these parameters is no longer valid in the case of high accelerating gradients leading to high particle velocity changes and in the case of multigap cavities. In this case, a new (¿s, T) definition allowing to keep both acceleration and longitudinal focusing properties is proposed. Examples are given in the SPIRAL2 linac case.  
Slides WEA3I1 [2.369 MB]  
DOI •  reference for this paper ※ doi:10.18429/JACoWHB2023WEA3I1  
About •  Received ※ 27 September 2023 — Revised ※ 12 October 2023 — Accepted ※ 13 October 2023 — Issued ※ 17 October 2023  
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WEA3I2 
Particle Resonances’ Domination Over Parametric Instabilities and Their Mitigation  


Studies have clarified the differences between the particle resonances and the parametric resonances (instabilities). Particle resonances dominate over parametric instabilities in resonance stopbands for nonKV beams, and higher order parametric instabilities are not manifested for Gaussian beams. Also mitigation of the 4th order particle resonance is studied using beam spinning by introducing angular momentum.  
Slides WEA3I2 [2.857 MB]  
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