Self-Amplified Spontaneous Emission Driven by a High-Brightness Electron Beam

Abstract

We report the first high-gain self-amplified spontaneous emission experiment at 15 mm driven by a high-brightness 17-MeV electron beam. A change of two decades in the beam current yields an increase of four decades in the measured infrared power. By fitting the measured infrared pulse energy to an analytic model, we estimate that eight power gain lengths, corresponding to a gain of 300, exist in the wiggler at 279 A. [S0031-9007 (98)06692-7] PACS numbers: 41.60. -m

Measurements of Gain Larger than105at12μmin a Self-Amplified Spontaneous-Emission Free-Electron Laser

“…Experimental results showing SASE with a gain of many orders of magnitude were first obtained at a wavelength of 8 mm propagating in a waveguide [3]. More recently, experimental results have been obtained by several groups in the infrared [4,5] and visible [6] with gains of about 1 order of magnitude or less and another with a gain of about 300 [7]. In this paper we report experimental data showing a gain of 3 3 10 5 at 12 mm.…”

Formulation of Emission From Relativistic Free Electrons in a Ring Structure for Electro-Optical Applications

“…On this basis, a theoretical study is done and a feasibility evaluation is performed with the FEL technology as reference frame due to similarity of basic physics and practical challenges. Reported advances of FELs in various dimensions [1,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] such as higher beam and radiation quality, wider tunable range and bandwidth, better pulse format control, migration towards compact and bench top structures further support the feasibility and significance of such electro-optical couplers.…”

“…These photoinjectors can improve the electron beam brightness by two orders of magnitude. As we discussed for the present scenario (operating in Compton scattering regime), however, the electron beam quality and current requirements introduce less stringent limitations considering the current FEL technology achievements and challenges [19][20][21][22][23][24][25][26][27].…”

“…In the second part; certain operating characteristics particular to this type of scenario such as bandwidth and tunability are described, effect of deviations from assumed or ideal model parameters such as energy spread are discussed, practical challenges and some potential solutions are addressed. These are done by referring to the fundamentally similar FELs operations, reported achievements [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], and previously published work(s) such as dispersion analysis [8]. It should be noted that we cannot capture all aspects of a practical realization or the associated required assumptions to be included in the formulations.…”

Soft and Hard X-ray SASE Free Electron Lasers

“…In 1997, the SASE amplification process was for the first time demonstrated at a wavelength of 16 µm at the UCLA Saturnus linac [21], and at 15 µm at the Advanced Free-Electron Laser (AFEL) linac of the Los Alamos National Laboratory [22]. Later on, using the UCLA-Kurchatov undulator from the Saturnus experiment, a gain larger than 10 5 at a wavelength of 12 µm was achieved at AFEL [23].…”