Senf F, Sawhney K J, Follath R, Scheer M, Schäfers F, Bahrdt J, Gaupp A, Gudat W
BESSY GmbH, Lentzeallee 100, D-14195 Berlin, Germany.
J Synchrotron Radiat. 1998 May 1;5(Pt 3):747-9. doi: 10.1107/S0909049597019869.
At BESSY II, a third-generation 1.7 GeV storage ring is under construction. A planar elliptical undulator will be installed as a source of X-rays that have a high degree of circular polarization. Radiation in the first, third and fifth harmonics will cover the energy range 87-1330 eV. The beamline will essentially consist of a plane-grating monochromator working with collimated light in the dispersion plane. A single set of optical elements can be used to handle the two angularly separated beams of opposite helicity from the double undulator. The degree of circular polarization ranges from 73 to 100%, and a flux of up to 5 x 10(13) photons s(-1) (100 mA)(-1) can be achieved. A maximum spectral resolution of about 13 000 will be possible at 100 eV using a 20 micro m slit.
在德国电子同步加速器研究所的第二代同步辐射装置（BESSY II），一台第三代1.7 GeV储存环正在建设中。将安装一个平面椭圆波荡器作为具有高度圆偏振的X射线源。基波、三次谐波和五次谐波辐射将覆盖87 - 1330 eV的能量范围。光束线主要由一个在色散平面内使用准直光的平面光栅单色仪组成。一组光学元件可用于处理来自双波荡器的两个角向分离的、具有相反螺旋性的光束。圆偏振度范围为73%至100%，并且可以实现高达5×10¹³ 光子·秒⁻¹（100 mA）⁻¹ 的通量。使用20微米狭缝时，在100 eV处最大光谱分辨率约为13000。
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