Electron Beam Transport from Laser Plasma Accelerator to Undulator with Quadrupole FODO Lattice

Laser Plasma Accelerators (LPAs) provide a means for producing electron beams (e-beams) of GeV energy levels through the mm-scale acceleration of charged particles via laser-driven plasma wakefields. In this work, we present on the transport of e-beams generated from an LPA to a unique undulator that was built with an embedded permanent magnet based FODO lattice. The 16 cell FODO lattice which spans the full length of the 4m undulator is designed to maintain small transverse beam sizes over the full undulator length and thereby increase the FEL rho parameter averaged over the length of the undulator. This focusing channel is beneficial for FEL applications but simultaneously imposes stringent requirements on the transverse stability of the LPA source. We have developed diagnostic techniques that enable precise measurement and characterization of these fluctuations. By understanding the root causes of these variations, we implement stabilization methods to minimize their impact on the electron beam before it enters the FODO lattice and undulator [1]. This work highlights the significance of efficient beam transport and stabilization techniques in bridging the gap between LPAs and their adoption in high impact applications like compact FEL systems.