2024/01/16 by D. Jeon, Jeon, Dong-O, Jiho Jang +1
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics
paper · pdf · doi:10.48550/arxiv.2401.08116
openalex publication_date 2024/01/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
For high-intensity linear accelerators, space-charge halo mechanisms are largely classified into two families: particle resonances and parametric instabilities. The dominance between the fourth-order particle resonance and the envelope instability has been argued and studied. Our studies and previous literatures indicate the dominance of particle resonances over parametric instabilities in high-intensity linear accelerators. Any counter evidence has not been found yet. Also all the studies indicate that parametric instabilities are unlikely to be observed in actual linear accelerators unless waterbag or KV beams are generated. We propose a way to overcome the previous design rule to avoid the zero-current phase advance sigmao > 90° for the high-intensity linac. The interplay is presented of the envelope instability and the fourth-order parametric instability.