Design of a high-resolution extreme-ultraviolet imaging spectrometer with aberration-corrected concave gratings

Harada, Tatsuo; Sakuma, Hideo; Takahashi, Kaoru; Watanabe, Tetsuya; Hara, Hirohisa; Kita, Toshiaki

doi:10.1364/ao.37.006803

Cited by 21 publications

(15 citation statements)

References 17 publications

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“…The two most important contributions are determined by twofold astigmatism and coma aberrations with C 12 and C 30 coefficients correspondingly [23,24].…”

Section: B Grating Modelingmentioning

confidence: 99%

Soft x-ray self-seeding simulation methods and their application for the Linac Coherent Light Source

Serkez

Krzywiński

Ding

et al. 2015

Phys. Rev. ST Accel. Beams

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Self-seeding is a promising approach to significantly narrow the self-amplified spontaneous emission bandwidth of X-ray free-electron lasers (FELs) and hence to produce nearly transform-limited pulses. We study the radiation propagation through a grating monochromator installed at the Linac Coherent Light Source (LCLS). The monochromator design is based on a toroidal VLS grating working at a fixed incidence angle mounting without an entrance slit. It covers the spectral range from 500 eV to 1000 eV. The optical system was studied using a wave optics method to evaluate the performance of the self-seeding scheme. Our wave optics analysis takes into account the finite size of the coherent source, third-order aberrations and height error of the optical elements. Two propagation approaches are studied with time-dependent FEL simulations. In addition, the pulse-front tilt phenomenon effect is illustrated.

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“…The two most important contributions are determined by twofold astigmatism and coma aberrations with C 12 and C 30 coefficients correspondingly [23,24].…”

Section: B Grating Modelingmentioning

confidence: 99%

Soft x-ray self-seeding simulation methods and their application for the Linac Coherent Light Source

Serkez

Krzywiński

Ding

et al. 2015

Phys. Rev. ST Accel. Beams

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“…The design is completed by two GI ellipsoidal mirrors: a pre-focusing section (mirror 1) for the focusing on the entrance slit, and a post-focusing section after the exit slit (mirror 2) for the focusing on the sample. The groove density of a VLS grating changes along the surface following a polynomial law: in such a system the aberrations can be controlled by the ruling parameters for space variation [6,7]. The groove density along the grating surface is expressed as (y) = + + ay2 + ay3 (1) where y spans over the grating surface in the direction perpendicular to the grooves, o is the central groove density (i.e.…”

Section: Monochromator Designmentioning

confidence: 99%

High-resolution monochromators for the utilization of the radiation from an EUV free-electron laser

Poletto

Azzolin

Tondello

2004

Fourth-Generation X-Ray Sources and Ultrafast X-Ray Detectors

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We present the optical design of high-resolution monochromators for the utilization of the radiation from a FEL at 40 and 10 nm, in the framework of a proposal made from Elettra Synchrotron (Trieste, Italy) to the Italian Ministry of Education, Universities and Research for the construction and operation of an ultra-high brilliance source in the UV and x region. Since the FEL emission is expected to be highly monochromatic (X/A2l0000), a monochromator is useful only if able to provide a spectral resolution higher than the intrinsic FEL resolution (X/&>100000). Two systems are presented: 1) normal-incidence configurations with multilayer-coated optics; 2) grazing-incidence configurations with a plane grating operated in conical diffraction. Normal-incidence configurations have very high spectral resolution, but the spectral band of operation is limited by the multilayer coating, so optics with different coatings have to be used when the FEL is tuned within the spectral region of operation. Configurations in conical diffraction have also very high resolution, higher efficiency and a wide spectral band of operation.

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“…The principles of the design of a SVLS grating spectrograph are already well established 6 . The groove density along the grating is expressed by a polynomial equation: …”

Section: The Spherical Variable-line-spaced Grating Spectrographmentioning

confidence: 99%

“…The best way of achieving this result is by adopting a single element optical configuration, as the classical Rowland mounting 4 . The optical configuration which has been found to give the best results and fulfilling the scientific requirements is an off-Rowland one, based on the design developed by Harada et al that uses a spherical varied line-space (SVLS) grating in normal incidence 5,6 . This configuration is well suitable for this instrument: in fact it can accept relatively large apertures still maintaining good optical performance, and the aberrations associated to offaxis points are rather low if compared to other single element spectroscopic optical design.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of the spectroscopic channel of UVISS, the ultraviolet Italian telescope for the ISS

Naletto¹,

Poletto²

2003

SPIE Proceedings

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The Ultra-Violet Italian Sky Surveyor (UVISS) is a small SiC far-and near-UV telescope under study by the Italian Space Agency to be installed on an available Express Pallet (ExPa) of the International Space Station (ISS). UVISS has two focal plane instruments: an ultraviolet imaging camera and a far ultraviolet spectrograph. This paper summarizes the conclusions of the study about the optical configuration of the spectrograph. This instrument has to cover the 91-130 nm spectral region with a moderately low resolving power (greater than 300 at 100 nm), a spatial resolution of 4 arcsec on-axis and minimization of spatial aberrations over arcmin's long entrance slit. Many problems had to be faced in the design of this instrument: from the very small available room, to the rather short visibility time of a single target on the sky, to the intrinsic pointing instability of the ISS. The adopted configuration of the spectrograph foresees the use of a spherical grating with parallel variable line spacing in the Harada mounting. The theoretical performance of this instrument obtained by ray-tracing simulation is given, showing that the optical requirements can be satisfied. Also, several efforts have been done in order to study the possibility of reconstructing the target spectra by means of a photon recentering technique to compensate the pointing instabilities due to the ISS environment. The details of this analysis are described, showing that the system optical performance can essentially be maintained also with a carrier so unstable as the ISS.

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Design of a high-resolution extreme-ultraviolet imaging spectrometer with aberration-corrected concave gratings

Cited by 21 publications

References 17 publications

Soft x-ray self-seeding simulation methods and their application for the Linac Coherent Light Source

Soft x-ray self-seeding simulation methods and their application for the Linac Coherent Light Source

High-resolution monochromators for the utilization of the radiation from an EUV free-electron laser

Performance analysis of the spectroscopic channel of UVISS, the ultraviolet Italian telescope for the ISS

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