The Israeli EA-FEL Upgrade Towards Long Pulse Operation for Ultra-High Resolution Single Pulse Coherent Spectroscopy

The Israeli Electrostatic Accelerator FEL (EA-FEL) is now being upgraded towards long pulse (100µs) operation and ultra-high resolution (10 -6 ) single pulse coherent spectroscopy. We present quantitative estimations regarding the applications of controlled radiation chirp for spectroscopic applications with pulse- time Fourier Transform limited spectral resolution. The presentation provides an overview of the upgrade status: a new broadband low-loss resonator is being manufactured; multi-stage depressed collector is assembled.