A KB-Focusing Mirror Pair for a VUV-Raman Spectrometer at FLASH – Mirror Metrology and Ray Tracing Results

2010 ◽  
Author(s):  
Frank Siewert ◽  
Ruben Reininger ◽  
Michael A. Rübhausen ◽  
R. Garrett ◽  
I. Gentle ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Raman Spectrometer ◽  
Mirror Pair

scholarly journals Diffraction gratings metrology and ray-tracing results for an XUV Raman spectrometer at FLASH

2018 ◽  
Vol 25 (1) ◽  
pp. 138-144 ◽  
Author(s):  
Siarhei Dziarzhytski ◽  
Frank Siewert ◽  
Andrey Sokolov ◽  
Grzegorz Gwalt ◽  
Tino Seliger ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Extreme Ultraviolet ◽  
Diffraction Gratings ◽  
High Energy ◽  
Stray Light ◽  
Resolving Power ◽  
Ex Situ ◽  
High Energy Resolution ◽  
Elastic Line ◽  
Raman Spectrometer

The extreme-ultraviolet double-stage imaging Raman spectrometer is a permanent experimental endstation at the plane-grating monochromator beamline branch PG1 at FLASH at DESY in Hamburg, Germany. This unique instrument covers the photon energy range from 20 to 200 eV with high energy resolution of about 2 to 20 meV (design values) featuring an efficient elastic line suppression as well as effective stray light rejection. Such a design enables studies of low-energy excitations like, for example, phonons in solids close to the vicinity of the elastic line. The Raman spectrometer effectively operates with four reflective off-axial parabolic mirrors and two plane-grating units. The optics quality and their precise alignment are crucial to guarantee best performance of the instrument. Here, results on a comprehensive investigation of the quality of the spectrometer diffraction gratings are presented. The gratings have been characterized byex situmetrology at the BESSY-II Optics Laboratory, employing slope measuring deflectometry and interferometry as well as atomic force microscopy studies. The efficiency of these key optical elements has been measured at the at-wavelength metrology laboratory using the reflectometer at the BESSY-II Optics beamline. Also, the metrology results are discussed with respect to the expected resolving power of the instrument by including them in ray-tracing studies of the instrument.

Field Estimation in Tunnel and Underground by Ray Tracing Method

2000 ◽  
Vol 54 (3) ◽  
pp. 46-56
Author(s):  
K. Uchida ◽  
D. Da ◽  
C. K. Lee ◽  
T. Matsunaga ◽  
T. Imai ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Ray Tracing Method ◽  
Field Estimation ◽  
Tracing Method

Borehole Acoustic Imaging Using 3D STC and Ray Tracing to Determine Far-Field Reflector Dip and Azimuth

2019 ◽  
Vol 60 (2) ◽  
pp. 335-347 ◽  
Author(s):  
Nicholas Bennett ◽  
◽  
Adam Donald ◽  
Sherif Ghadiry ◽  
Mohamed Nassar ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Acoustic Imaging ◽  
Far Field
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