High-energy X-ray optics with silicon saw-tooth refractive lenses

被引:48
作者
Shastri, S. D. [1 ]
Almer, J.
Ribbing, C.
Cederstrom, B.
机构
[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[2] Univ Uppsala, Dept Engn Sci, Uppsala, Sweden
[3] Royal Inst Technol, Dept Phys, Stockholm, Sweden
关键词
saw-tooth lenses; refractive lenses; high-energy X-rays; X-ray optics;
D O I
10.1107/S0909049507003962
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Silicon saw-tooth refractive lenses have been in successful use for vertical focusing and collimation of high-energy X-rays (50-100 keV) at the 1-ID undulator beamline of the Advanced Photon Source. In addition to presenting an effectively parabolic thickness profile, as required for aberration-free refractive optics, these devices allow high transmission and continuous tunability in photon energy and focal length. Furthermore, the use of a single-crystal material (i.e. Si) minimizes small-angle scattering background. The focusing performance of such saw-tooth lenses, used in conjunction with the 1-ID beamline's bent double-Laue monochromator, is presented for both short (similar to 1: 0.02) and long (similar to 1: 0.6) focal-length geometries, giving line-foci in the 2 mu m-25 mu m width range with 81 keV X-rays. In addition, a compound focusing scheme was tested whereby the radiation intercepted by a distant short-focal-length lens is increased by having it receive a collimated beam from a nearer ( upstream) lens. The collimation capabilities of Si saw-tooth lenses are also exploited to deliver enhanced throughput of a subsequently placed small-angular-acceptance high-energy-resolution post-monochromator in the 50-80 keV range. The successful use of such lenses in all these configurations establishes an important detail, that the pre-monochromator, despite being comprised of vertically reflecting bent Laue geometry crystals, can be brilliance-preserving to a very high degree.
引用
收藏
页码:204 / 211
页数:8
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