Microfocusing at the PG1 beamline at FLASH

被引：11

作者：

Dziarzhytski, Siarhei ^{[1
]}

Gerasimova, Natalia ^{[2
]}

Goderich, Rene ^{[3
]}

Mey, Tobias ^{[4
]}

Reininger, Ruben ^{[5
]}

Ruebhausen, Michael ^{[6
,7
]}

Siewert, Frank ^{[8
]}

Weigelt, Holger ^{[1
]}

Brenner, Guenter ^{[1
]}

机构：

[1] DESY, D-22067 Hamburg, Germany

[2] European XFEL GmbH, D-22761 Hamburg, Germany

[3] Univ S Florida, Tampa, FL 33620 USA

[4] Laser Lab Gottingen eV, D-37077 Gottingen, Germany

[5] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[6] Univ Hamburg, D-22607 Hamburg, Germany

[7] Ctr Free Electron Laser Sci, D-22607 Hamburg, Germany

[8] Helmholtz Zentrum Berlin BESSY II, Inst Nanometre Opt & Technol, D-12489 Berlin, Germany

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2016年 / 23卷

关键词：

free-electron laser; Kirkpatrick-Baez mirror system; microfocus; plane-grating monochromator beamline; FREE-ELECTRON LASER; COHERENCE PROPERTIES; RAY; MONOCHROMATOR; METROLOGY; MIRROR; BESSY;

D O I：

10.1107/S1600577515023127

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The Kirkpatrick-Baez (KB) refocusing mirror system installed at the PG1 branch of the plane-grating monochromator beamline at the soft X-ray/XUV free-electron laser in Hamburg (FLASH) is designed to provide tight aberration-free focusing down to 4 mu m x 6 mu m full width at half-maximum (FWHM) on the sample. Such a focal spot size is mandatory to achieve ultimate resolution and to guarantee best performance of the vacuum-ultraviolet (VUV) off-axis parabolic double-monochromator Raman spectrometer permanently installed at the PG1 beamline as an experimental end-station. The vertical beam size on the sample of the Raman spectrometer, which operates without entrance slit, defines and limits the energy resolution of the instrument which has an unprecedented design value of 2 meV for photon energies below 70 eV and about 15 meV for higher energies up to 200 eV. In order to reach the designed focal spot size of 4 mu m FWHM (vertically) and to hold the highest spectrometer resolution, special fully motorized in-vacuum manipulators for the KB mirror holders have been developed and the optics have been aligned employing wavefront-sensing techniques as well as ablative imprints analysis. Aberrations like astigmatism were minimized. In this article the design and layout of the KB mirror manipulators, the alignment procedure as well as microfocus optimization results are presented.

引用

页码：123 / 131

页数：9

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