ABSTRACT
A flat-field grazing incidence spectrometer operating on the spectral region from 1 to 10 nm was built for research on physics of high temperature and high energy density plasmas. It consists of a flat-field grating with 2400 lines/mm as a dispersing element and an x-ray charged coupled device (CCD) camera as the detector. The diffraction efficiency of the grating and the sensitivity of the CCD camera were directly measured by use of synchrotron radiation at the BL-11D beamline of the Photon Factory (PF). The influence of contamination to the spectrometer also was characterized. This result enables us to evaluate the absolute number of photons in a wide range wavelength between 1 and 10 nm within an acquisition. We obtained absolutely calibrated spectra from highly charged ion plasmas of Gd, from which a maximum energy conversion efficiency of 0.26% was observed at a Nd:YAG laser intensity of 3 × 1012 W/cm2.
Acknowledgments
This work was performed under the auspices of MEXT (Ministry of Education, Culture, Sports, Science and Technology, Japan) and “Project for Bio-Imaging and Sensing at Utsunomiya University” from MEXT and was performed under the Cooperative Research Program of “Network Joint Research Center for Materials and Devices” (under Contract Subject No. 2015209) and IMRAM, Tohoku University, Heisei 27 nendo Grant. One of the authors (T.H.D.) also acknowledges support from Grant-in-Aid for Young Scientists B (Grant No. 15K18045) and JSPS Postdoctoral Fellowship for Overseas Researchers (Grant No. P16019). Measurements of the grating efficiency and the response of the x-ray CCD camera were performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2015G667). One of the authors (T.H.) also acknowledges support from The Canon Foundation, Research Grant (Basic Research) on TEPCO Memorial Foundation. The UCD group was supported by Science Foundation Ireland International Co-operation Strategic Award No. 13/ISCA/2846.
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