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SUMMARY:THE INFLUENCE OF INTERNAL BERYLLIUM MICROSTRUCTURE AND IMPURITIES 
 ON THE CRL X-RAY OPTICAL PROPERTIES
DTSTART;VALUE=DATE-TIME:20200713T132300Z
DTEND;VALUE=DATE-TIME:20200713T132400Z
DTSTAMP;VALUE=DATE-TIME:20260814T160653Z
UID:indico-contribution-1894@indico.inp.nsk.su
DESCRIPTION:Speakers: Ivan Lyatun (X-Ray Coherent Optics Laboratory (IKBFU
 ))\nNovel fourth generation and updated synchrotron radiation sources requ
 ire highest quality X-ray optics resilient to extreme thermal and radiatio
 n loading while preserving their coherence and brilliance. And refractive 
 optics is the best candidate for this task due to its extensively employed
  at synchrotrons and X-ray free-electron lasers. Refractive lenses are use
 d as condensers\, micro-radian collimators\, low-band pass filters\, high 
 harmonics rejecters\, beam-shaping elements. Two-dimensional beryllium len
 ses are and remain the driving force in the development of Fourier optics\
 , coherent diffraction and full-field imaging techniques. However\, the de
 velopment of new coherent techniques such as phase-contrast imaging and co
 herent diffraction microscopy demanded to revise the requirements for surf
 ace quality and internal structure of X-ray optic materials [1-3].\nIt is 
 worth noting that almost all beryllium grades\, used for X-ray optics manu
 facturing\, are sintered materials\, which have inevitably internal micro-
  and nanograined structure and relatively high beryllium oxide (BeO) and o
 ther heavy elements concentration\, which leads to strong small- and ultra
 -small angular X-ray scattering and additional losses of intensity [4]. Th
 e influence of the beryllium microstructure and impurities on the optical 
 properties of the compound refractive lens was studied and successfully de
 monstrated for the first time in the microbeam and coherent full-field har
 d X-ray microscopy mode [5]. The paper includes recommendations on berylli
 um refractive lenses and beryllium windows manufacturing processes by usin
 g different beryllium grades for various applications of X ray optics. We 
 are confident that there is a reasonable choice of beryllium materials sui
 table for coherence related techniques allowing to use the full potential 
 of novel X-ray sources.\nThis research was supported by the Russian Scienc
 e Foundation (Project No. 19-72- 30009).\n\n\n[1] A. Snigirev\, V. Kohn\, 
 I. Snigireva\, B. Lengeler\, Nature\, 384 (1996) 49. \n[2] A. Snigirev\, I
 . Snigireva\, Springer Series in Optical Sciences\, 137 (2008) 255.\n[3] T
 . Roth\, A. Snigirev\, A.andetal. MRS Bulletin\, 42(6)\, (2017) 430-436.\n
 [4] I. Lyatun\, A. Goikhman\, P. Ershov\, I. Snigireva\, A. Snigirev\, Jou
 rnal of Surface Investigation.  X-ray\, Synchrotron and Neutron Techniques
 \, 9 (2015) 446.\n[5] I. Lyatun\, P. Ershov\, I. Snigireva\, A. Snigirev\,
  Journal of Synchrotron Radiation\, 27(1)\, (2020).\n\nhttps://indico.inp.
 nsk.su/event/24/contributions/1894/
LOCATION:
URL:https://indico.inp.nsk.su/event/24/contributions/1894/
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