Shi Zhan, Zhao Ruifeng, Li Wenxian, Tu Bingsheng, Yang Yang, Xiao Jun, Huldt Sven, Hutton Roger, Zou Yaming
EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, People's Republic of China.
Lund Observatory, Lund University, Lund SE-22100, Sweden.
Rev Sci Instrum. 2014 Jun;85(6):063110. doi: 10.1063/1.4876597.
A portable high resolution soft x-ray and extreme ultraviolet (EUV) spectrometer has been developed for spectroscopic research at the Shanghai Electron Beam Ion Trap (EBIT) laboratory. A unique way of aligning the grazing incidence spectrometer using the zero order of the grating is introduced. This method is realized by extending the range of the movement of the CCD detector to cover the zero order. The alignment can be done in a few minutes, thus leading to a portable spectrometer. The high vacuum needed to be compatible with the EBITs is reached by mounting most of the translation and rotation stages outside the chamber. Only one high vacuum compatible linear guide is mounted inside the chamber. This is to ensure the convenient interchange of the gratings needed to enable wavelength coverage of the whole range of 10 to 500 Å. Spectra recorded with one of our low energy EBITs shows that a resolving power of above 800 can be achieved. In the slitless configuration used in this work, we found the resolving power to be limited by the width of the EBIT plasma. When mounted on the Shanghai EBIT which is a high energy EBIT and has a narrower EBIT plasma width, the estimated resolving power will be around 1400 at 221.15 Å.
为了在上海电子束离子阱（EBIT）实验室进行光谱研究，已经研制出一种便携式高分辨率软X射线和极紫外（EUV）光谱仪。介绍了一种利用光栅零级来对准掠入射光谱仪的独特方法。该方法通过扩展电荷耦合器件（CCD）探测器的移动范围以覆盖零级来实现。对准操作可以在几分钟内完成，从而造就了一种便携式光谱仪。通过将大部分平移和旋转台安装在腔室外，达到了与EBIT兼容所需的高真空环境。仅在腔室内安装了一个与高真空兼容的直线导轨。这样做是为了确保能够方便地更换光栅，以实现10至500埃整个波长范围的覆盖。用我们的一台低能量EBIT记录的光谱表明，可以实现800以上的分辨本领。在这项工作所采用的无狭缝配置中，我们发现分辨本领受EBIT等离子体宽度的限制。当安装在作为高能量EBIT且具有更窄EBIT等离子体宽度的上海EBIT上时，在221.15埃处估计分辨本领约为1400。
