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H.-D. Nuhn

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Last Name: Nuhn

Full Name: H.-D. Nuhn

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3 papers

title: Results of the VISA SASE FEL Experiment at 840 nm

format: conference procceeding

conference: 24th International Free Electron Laser Conference

year: 2003

26 authors: A. Murokh | R. Agustsson | M. BABZIEN | I. Ben-Zvi | L. Bertolini | K. van Bibber | R. Carr | M. Cornacchia | P. Frigola | J. Hill | E. Johnson | L. Klaisner | G. Le Sage | M. Libkind | R. Malone | H.-D. Nuhn | C. Pellegrini | S. Reiche | G. Rakowsky | J. B. Rosenzweig | R. Ruland | J. Skaritka | A. Toor | A. Tremaine | X. Wang | V. Yakimenko

abstract: VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within a single-pass 4-m undulator. A gain length shorter than 18 cm has been obtained, yielding the gain of 2x10(8) at saturation. The FEL performance, including the spectral, angular, and statistical properties of SASE radiation, has been characterized for different electron beam conditions. The results are compared to 3-D SASE FEL theory and start-to-end numerical simulations of the entire injector, transport, and FEL system. Detailed agreement between simulations and experimental results is obtained over the wide range of the electron beam parameters.

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title: Intra-undulator measurements at VISA FEL

format: conference procceeding

conference: 22nd International Free Electron Laser Conference

year: 2001

11 authors: A. Murokh | P. Frigola | C. Pellegrini | J. Rosenzweig | A. Tremaine | E. Johnson | X.J. Wang | V. Yakimenko | L. Klaisner | H.-D. Nuhn | A. Toor

abstract: We describe a diagnostics system developed, to measure exponential gain properties and the electron beam dynamics inside the strong focusing 4-m long undulator for the VISA (Visible to Infrared SASE Amplifier) FEL. The technical challenges included working inside the small undulator gap, optimising the electron beam diagnostics in the high background environment of the spontaneous undulator radiation, multiplexing and transporting the photon beam. Initial results are discussed.

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title: Optimization of an X-ray SASE FEL

format: conference procceeding

conference: 19th ICFA Beam Dynamics Workshop on Physics of, and Science with, the X-Ray Free-Electron Laser

year: 2001

7 authors: C. Pellegrini | S. Reiche | J. Rosenzweig | C. Schroeder | A. Varfolomeev | S. Tolmachev | H.-D. Nuhn

abstract: The most important characteristics of an X-ray SASE-FEL are determined by the electron beam energy, transverse and longitudinal emittance, and by choice of the undulator period, field, and gap. Among them are the gain and saturation length, the amount and spectral characteristics of the spontaneous radiation, the wake fields due to the vacuum pipe. The spontaneous radiation intensity is very large in all X-ray SASE-FELs now being designed, and it contributes to the final electron beam energy spread, thus affecting the gain. It also produces a large background for the beam and radiation diagnostics instrumentation. The wake fields due to the resistivity and roughness of the beam pipe through the undulator, also affects the beam 6-dimensional phase space volume, and thus the gain and the line width. In this paper, we discuss ways to optimize the FEL when considering all these effects. In particular we consider and discuss the use of a hybrid iron-permanent magnet helical undulator to minimize some of these effects, and thus optimize the FEL design.

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title:	Results of the VISA SASE FEL Experiment at 840 nm
format:	conference procceeding
conference:	24th International Free Electron Laser Conference
year:	2003
26 authors:	A. Murokh \| R. Agustsson \| M. BABZIEN \| I. Ben-Zvi \| L. Bertolini \| K. van Bibber \| R. Carr \| M. Cornacchia \| P. Frigola \| J. Hill \| E. Johnson \| L. Klaisner \| G. Le Sage \| M. Libkind \| R. Malone \| H.-D. Nuhn \| C. Pellegrini \| S. Reiche \| G. Rakowsky \| J. B. Rosenzweig \| R. Ruland \| J. Skaritka \| A. Toor \| A. Tremaine \| X. Wang \| V. Yakimenko
abstract:	VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within a single-pass 4-m undulator. A gain length shorter than 18 cm has been obtained, yielding the gain of 2x10(8) at saturation. The FEL performance, including the spectral, angular, and statistical properties of SASE radiation, has been characterized for different electron beam conditions. The results are compared to 3-D SASE FEL theory and start-to-end numerical simulations of the entire injector, transport, and FEL system. Detailed agreement between simulations and experimental results is obtained over the wide range of the electron beam parameters.
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title:	Intra-undulator measurements at VISA FEL
format:	conference procceeding
conference:	22nd International Free Electron Laser Conference
year:	2001
11 authors:	A. Murokh \| P. Frigola \| C. Pellegrini \| J. Rosenzweig \| A. Tremaine \| E. Johnson \| X.J. Wang \| V. Yakimenko \| L. Klaisner \| H.-D. Nuhn \| A. Toor
abstract:	We describe a diagnostics system developed, to measure exponential gain properties and the electron beam dynamics inside the strong focusing 4-m long undulator for the VISA (Visible to Infrared SASE Amplifier) FEL. The technical challenges included working inside the small undulator gap, optimising the electron beam diagnostics in the high background environment of the spontaneous undulator radiation, multiplexing and transporting the photon beam. Initial results are discussed.
keywords:
Download \| View \| Details \| edit \| delete

title:	Optimization of an X-ray SASE FEL
format:	conference procceeding
conference:	19th ICFA Beam Dynamics Workshop on Physics of, and Science with, the X-Ray Free-Electron Laser
year:	2001
7 authors:	C. Pellegrini \| S. Reiche \| J. Rosenzweig \| C. Schroeder \| A. Varfolomeev \| S. Tolmachev \| H.-D. Nuhn
abstract:	The most important characteristics of an X-ray SASE-FEL are determined by the electron beam energy, transverse and longitudinal emittance, and by choice of the undulator period, field, and gap. Among them are the gain and saturation length, the amount and spectral characteristics of the spontaneous radiation, the wake fields due to the vacuum pipe. The spontaneous radiation intensity is very large in all X-ray SASE-FELs now being designed, and it contributes to the final electron beam energy spread, thus affecting the gain. It also produces a large background for the beam and radiation diagnostics instrumentation. The wake fields due to the resistivity and roughness of the beam pipe through the undulator, also affects the beam 6-dimensional phase space volume, and thus the gain and the line width. In this paper, we discuss ways to optimize the FEL when considering all these effects. In particular we consider and discuss the use of a hybrid iron-permanent magnet helical undulator to minimize some of these effects, and thus optimize the FEL design.
keywords:
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