A Proposal for an X-Ray Free-Electron Laser Oscillator with an Energy-Recovery Linac

Abstract

We show that a free-electron laser oscillator generating x rays with wavelengths of about 1 A is feasible using ultralow emittance electron beams of a multi-GeV energy-recovery linac, combined with a low-loss crystal cavity. The device will produce x-ray pulses with 10{9} photons at a repetition rate of 1-100 MHz. The pulses are temporarily and transversely coherent, with a rms bandwidth of about 2 meV, and rms pulse length of about 1 ps.

Absorption X près des seuils (XANES, EXAFS) pour l'étude de la matière dense et tiède

“…La technique dite de "slicing" offre une durée d'impulsion sub-ps au prix d'un nombre de photons X fortement réduit [3,4]. Les futures machines XFEL annoncent une durée d'impulsion de quelques centaines de femtosecondes, mais avec une émission X de gamme énergétique réduite (rayonnement quasimonochromatique) [5]. Une autre solution consiste à produire une source X ultra-brève issue de plasmas chauds et denses créés par une impulsion laser ultra-courte.…”

A high-resolution multi-slit phase space measurement technique for low-emittance beams

“…Given the recent progress in low-charge operation of the photoinjector for a x-ray free-electron laser [2] and advanced beam manipulation such as flat-beam generation [3], the emittance of the beam can be as low as ε n = 0.1 μm. More recently there has also been increasing interest in measuring ultralow emittance beams needed in compact x-ray sources employing novel cathodes [4] and X-ray FEL oscillators (XFELOs) [5]. For these contemplated accelerators, it is critical to measure the transverse phase space and associated emittance with high resolution.…”

Atomic inner-shell radiation seeded free-electron lasers

“…In order to obtain fully coherent x-ray light pulses, a variety of new lasing schemes have been proposed and already demonstrated. For example, direct-seeding [10], self-seeding [11][12][13][14], high-gain harmonic generation [15][16][17][18][19][20], echo-enhanced harmonic generation [21], phase-merging enhanced harmonic generation [22,23], x-ray free-electron laser oscillator [24][25][26], in particular the self-seeding method is the most widely used scheme in hard XFEL facilities.…”