FEL2019 - List of Authors (Anisimov, P.M.)

Paper	Title	Page
MOC01	Regenerative Amplifier FEL - from IR to X-Rays	20
	D.C. Nguyen, P.M. Anisimov, C.E. Buechler, Q.R. Marksteiner, R.L. Sheffield LANL, Los Alamos, New Mexico, USA
	The Regenerative Amplifier FEL (RAFEL) feeds back a small fraction of the radiation exiting a high-gain undulator as the seed for the next pass, and achieves narrow linewidth and saturation in a few passes. For the IR RAFEL, we used an optical cavity with annular mirrors to reinject ~10% of the IR radiation back into a two-meter undulator [1]. Since then, a number of researchers have proposed RAFEL and XFELO to achieve full temporal coherence in VUV and X-ray FELs [2-5]. For the XFELO, symmetric Bragg backscattering off high-quality diamond crystals can provide very high reflectivity for the XFELO cavity [6]. The required reflectivity for a RAFEL feedback cavity is much lower than the XFELO. We show that 6% feedback is sufficient for the X-ray RAFEL at 9.8 keV to saturate and achieve 0.5-eV bandwidth. We discuss options to out-couple more than ~50% of the RAFEL intra-cavity power and discuss challenges associated with X-ray absorption in the out-coupler. [1] D. Nguyen et al. NIMA 429 125 (1999) [2] B. Faatz et al. NIMA A429 424 (1999) [3] Z. Huang et al. PRL 96 144801 (2006) [4] B.W.J. McNeil et al. NJP 9 239 (2007) [5] G. Marcus et al. FEL17 MOP061 (2017) [6] K. Kim et al. PRL 100 244802 (2008)
	Slides MOC01 [1.260 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-MOC01
About •	paper received ※ 21 August 2019 paper accepted ※ 28 August 2019 issue date ※ 05 November 2019
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THB01	Using an E-SASE Compression to Suppress Microbunch Instability and Resistive-Wall Wake Effects
	P.M. Anisimov LANL, Los Alamos, New Mexico, USA
	Funding: Research presented in this presentation was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20180535ECR. High brightness electron sources, such as photo injectors, deliver electron beams with a few Ampere peak currents yet high energy X-ray free-electron lasers require electron beams with >3kA peak currents to operate. In order to bridge this gap, a 100x beam compression that does not reduce the brightness of an electron beam has to take place. We will present our study of an E-SASE based compression scheme aimed at satisfying the requirements of high energy X-ray free electron lasers regarding electron beam currents, energy spreads and emittances. The E-SASE compression is based on a laser modulation of an electron beam energy and subsequent compression in a small magnetic chicane, which results in a train of high current bunches that are synchronized to the external laser and could be used in pump-probe experiments. A unique time profile of an electron beam is expected to suppress the resistive-wall wake effects.
	Slides THB01 [11.055 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Regenerative Amplifier FEL - from IR to X-Rays

20

D.C. Nguyen, P.M. Anisimov, C.E. Buechler, Q.R. Marksteiner, R.L. Sheffield
LANL, Los Alamos, New Mexico, USA

The Regenerative Amplifier FEL (RAFEL) feeds back a small fraction of the radiation exiting a high-gain undulator as the seed for the next pass, and achieves narrow linewidth and saturation in a few passes. For the IR RAFEL, we used an optical cavity with annular mirrors to reinject ~10% of the IR radiation back into a two-meter undulator [1]. Since then, a number of researchers have proposed RAFEL and XFELO to achieve full temporal coherence in VUV and X-ray FELs [2-5]. For the XFELO, symmetric Bragg backscattering off high-quality diamond crystals can provide very high reflectivity for the XFELO cavity [6]. The required reflectivity for a RAFEL feedback cavity is much lower than the XFELO. We show that 6% feedback is sufficient for the X-ray RAFEL at 9.8 keV to saturate and achieve 0.5-eV bandwidth. We discuss options to out-couple more than ~50% of the RAFEL intra-cavity power and discuss challenges associated with X-ray absorption in the out-coupler.
[1] D. Nguyen et al. NIMA 429 125 (1999)
[2] B. Faatz et al. NIMA A429 424 (1999)
[3] Z. Huang et al. PRL 96 144801 (2006)
[4] B.W.J. McNeil et al. NJP 9 239 (2007)
[5] G. Marcus et al. FEL17 MOP061 (2017)
[6] K. Kim et al. PRL 100 244802 (2008)

Slides MOC01 [1.260 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-MOC01

About •

paper received ※ 21 August 2019 paper accepted ※ 28 August 2019 issue date ※ 05 November 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THB01

Using an E-SASE Compression to Suppress Microbunch Instability and Resistive-Wall Wake Effects

P.M. Anisimov
LANL, Los Alamos, New Mexico, USA

Funding: Research presented in this presentation was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20180535ECR.
High brightness electron sources, such as photo injectors, deliver electron beams with a few Ampere peak currents yet high energy X-ray free-electron lasers require electron beams with >3kA peak currents to operate. In order to bridge this gap, a 100x beam compression that does not reduce the brightness of an electron beam has to take place. We will present our study of an E-SASE based compression scheme aimed at satisfying the requirements of high energy X-ray free electron lasers regarding electron beam currents, energy spreads and emittances. The E-SASE compression is based on a laser modulation of an electron beam energy and subsequent compression in a small magnetic chicane, which results in a train of high current bunches that are synchronized to the external laser and could be used in pump-probe experiments. A unique time profile of an electron beam is expected to suppress the resistive-wall wake effects.

Slides THB01 [11.055 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)