Next generation accelerators

This theme investigates the novel concept of non-scaling FFAG accelerators which remove the traditional scaling constraints in fixed field alternating-gradient accelerators. By allowing variable tune and crossing resonant conditions during acceleration, NS-FFAGs enable more compact magnet designs and rapid acceleration pathways such as serpentine channels, offering advantages for accelerating unstable particles like muons within their short lifetimes and for high intensity proton drivers. Understanding the beam dynamics, stability, and practical implementation of NS-FFAGs is critical for their application in future collider and particle source facilities.

This theme focuses on advanced acceleration methods utilizing plasma-based wakefield accelerators, dielectric laser accelerators (DLA), and laser-driven structures that promise extremely high accelerating gradients exceeding conventional RF limits. Research in this area addresses driver technologies (laser and beam), beam quality preservation, synchronization, and the development of integrated components from electron sources to beam control within micro- and nano-structured devices. This technology is critical for developing ultra-compact, high-gradient accelerators suitable for applications ranging from high energy physics to radiation sources and medical systems.

This theme covers experimental and theoretical studies of radio-frequency (RF) breakdown events in high-gradient normal-conducting accelerator structures, which produce parasitic electromagnetic fields causing beam orbit deflections and energy loss. Understanding the temporal and spatial characteristics of breakdown-induced beam kicks, their impact on beam stability, and strategies to mitigate these effects is vital to achieving the high gradient and beam quality necessary for linear colliders such as CLIC. Diagnostics involving time-resolved beam position monitors and beam profile measurements play key roles in quantifying these effects.