Congratulations to Mr. Kittipong Techakaew, a Ph.D. student and a valued member of the Electron Linac Laboratory (PCELL), on the successful publication of his research article in the journal Particle.

Title Beam Emittance and Bunch Length Diagnostics for the MIR-FEL Beamline at Chiang Mai University

Kittipong Techakaew, Kanlayaporn Kongmali, Siriwan Pakluea and Sakhorn Rimjaem

Link: https://www.mdpi.com/2571-712X/8/3/64

https://doi.org/10.3390/particles8030064

This study presents the design and development of beam diagnostic tools for the mid-infrared free-electron laser (MIR-FEL) system at the PBP-CMU Electron Linac Laboratory. The 25 MeV electron beam was optimized using ASTRA simulations to achieve beam parameters suitable for MIR-FEL generation. The diagnostic system was developed based on these optimized beam properties.

A transverse emittance measurement system, consisting of two quadrupole magnets and a beam profile measurement system, achieved less than 20% measurement error for beams with transverse sizes below 2 mm.

A bunch length measurement system, using a transition radiation (TR) station and a Michelson interferometer, enabled femtosecond-scale bunch length measurements. In this study, the effects of transverse beam size, beam splitter type, and radiator size on the accuracy of bunch length measurement were considered. A 6 mm-thick silicon beam splitter was found to yield the most accurate results.

These outcomes provide a practical and precise diagnostic framework for high-quality electron beam characterization, supporting improved performance in MIR-FEL systems.