Abstract
In this letter we describe a new micro-bunching instability occurring in charged particle beams propagating along a straight trajectory: based on the dynamics we named it a Plasma Cascade Instability.
Highlights
High brightness intense charged particle beams play a critical role in the exploration of modern science frontiers [1]
Such beams are central elements of high luminosity hadron colliders [2,3,4,5] as well as for x-ray femtosecond free-electron lasers (FEL) [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]. In the future, such beams could be necessary for cooling hadron beams in high-luminosity colliders [21,22,23], for driving x-ray FEL oscillators [24,25,26,27] and plasmawakefield accelerators with TV/m accelerating gradients [28,29,30,31,32,33,34,35,36]
Dynamics of high intensity beams are driven by both external factors—such as focusing and accelerating fields—and self-induced effects—such as space charge [37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58], wakefields from the surrounding environment and radiation of the beam [59,60,61,62,63,64,65]
Summary
High brightness intense charged particle beams play a critical role in the exploration of modern science frontiers [1] Such beams are central elements of high luminosity hadron colliders [2,3,4,5] as well as for x-ray femtosecond free-electron lasers (FEL) [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]. Less known applications are coherent electron cooling (CeC) of hadron beams [71,72,73,74,75] and generation of broadband high power radiation by microbunched beams [76,77,78]. We start from a qualitative description of the PCI, which will be followed by a brief theory, 3D simulations and experimental observations of this phenomenon
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