Speaker
Description
Modern particle accelerators, while enabling cutting-edge research, face major challenges in energy efficiency and beam intensity. The PERLE (Powerful Energy Recovery Linac for Experiments) project, developed at IJCLab/CNRS, aims to demonstrate a high-current energy recovery linac (ERL) using superconducting RF technology. By recovering the beam energy after use, PERLE drastically reduces RF power consumption and cryogenic load, paving the way for sustainable, high-performance accelerators. A key element is the development of alkali-antimonide photocathodes, combining high quantum efficiency and low thermal emittance. CsK₂Sb photocathodes, in particular, show excellent response to visible light, enabling operation with lower laser power and improved beam quality. Their fabrication relies on a unique deposition system equipped with a dedicated transfer line that links the glove box—where precursors are prepared—to the molecular beam epitaxy (MBE) chamber for growth, and ultimately to the electron gun for installation. Preliminary tests at IJCLab achieved a quantum efficiency of 3 %, validating this integrated approach for high-current ERLs such as PERLE.
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