High-temperature superconductor undulators and magnets for the future compact light sources

In this contribution, an overview of the ongoing projects at KIT on the high-temperature superconductor (HTS) undulators and magnets is given, and the research on beam dynamics and magnet design of a laser-plasma accelerator-based, miniature beam transport line using HTS novel periodic magnets is presented in detail. In laser-plasma accelerators (LPA), due to extremely high accelerating gradients, electron bunches are accelerated to high energies in only a few millimeters to centimeters of acceleration length. To efficiently capture and transport the LPA-generated bunches in a compact transport line, beam line designs employing high-strength combined-function magnets based on high-temperature superconductor technology have been studied. Moreover, to overcome coil winding challenges in fabricating miniature HTS magnets, novel periodic magnets have been designed, which can collimate and guide the electron beams in a well-controlled short-length transport line. The designed transport line has a length of 1.4 m matching the beam optics parameters of the LPA-generated electron beams to the transverse-gradient undulator (TGU) requirements.