Generation of Femtosecond Electron and Photon Pulses

Abstract

Femtosecond (fs) electron and photon pulses become a tool of increasing importance to study dynamics in ultrafast processes. Such short electron pulses can be generated from a system consisting of a thermioniccathode RF-gun and a magnetic bunch compressor. The fs electron pulses can be used directly or used as a source to produce equally short electromagnetic radiation pulses via certain kind of radiation production processes. At the Fast Neutron Research Facility (FNRF), Thailand, we are especially interested in production of radiation in Farinfrared and X-ray regime. In the far-infrared wavelengths, the radiation emitted from fs electron pulses is emitted coherently resulting high intensity radiation. In the X-ray regime, development of fs X-ray sources is crucial for application in ultrafast sciene.

Development of an Undulator Magnetic Field Measurement System for the Free‐Electron Laser Facility at Chiang‐Mai University

“…In‐house development of compact electromagnet undulators for the THz–FEL has been ongoing at our facility. [ 17–19 ] This undulator measurement system is therefore valuable not only for the development of prototypes but also for the analysis and tuning of full‐length undulators in the future.…”

“…The prototype was designed to simplify pole machining and assembly by using only rectangular magnet poles. [ 17,18 ] It has 13 pairs of poles, 532 turns of coils per pole, and an undulator gap of 10.5 mm. The prototype was constructed using CNC machining to produce each set of a few pole pieces, which were then attached to an iron yoke.…”

RF gun for an intense THz radiation source

“…A 1.6 cells thermionic RF gun has been developed and operated successfully at APS [2,3] , SUNSHINE [4] for ultra-short electron bunches. At SINAP, a 1.6 cell, π/2 mode with a side couple bi-period structure has been developed.…”

Beam Characterizations at Femtosecond Electron Beam Facility

“…Electron bunch lengths will be measured by autocorrelation of the coherent TR via a FIR spectroscopy in a Michelson interferometer. More details regarding to the radiation productions are presented in reference [5].…”