TY - JOUR
T1 - Selection of target elements for laser-produced plasma soft x-ray sources
AU - Tamura, Toshiki
AU - Arai, Goki
AU - Kondo, Yoshiki
AU - Hara, Hiroyuki
AU - Hatano, Tadashi
AU - Ejima, Takeo
AU - Jiang, Weihua
AU - Suzuki, Chihiro
AU - O’Sullivan, Gerry
AU - Higashiguchi, Takeshi
N1 - Funding Information:
Funding. Japan Society for the Promotion of Science (JSPS) (16H03902, 17J08957, JP15H03570, JP15H03759); Project for Bio-Imaging and Sensing at Utsunomiya University (20173017); National Institute for Fusion Science (NIFS) (NIFS17KLPH028); Photon Factory Program Advisory Committee (2015G667).
Funding Information:
Japan Society for the Promotion of Science (JSPS) (16H03902, 17J08957, JP15H03570, JP15H03759); Project for Bio-Imaging and Sensing at Utsunomiya University (20173017); National Institute for Fusion Science (NIFS) (NIFS17KLPH028); Photon Factory Program Advisory Committee (2015G667). This work was supported by JSPS (Japan Society for the Promotion of Science) KAKENHI, Grant-in-Aid for Scientific Research (B), Grant-in-Aid for JSPS Research Fellow, and the JSPS Bilateral Joint Research Project. This work was also performed under “Project for Bio-Imaging and Sensing at Utsunomiya University,” the Cooperative Research Program of “Network Joint Research Center for Materials and Devices,” and the auspices of the NIFS Collaboration Research Program. Measurements of the grating efficiency and the response of the x-ray CCD camera were performed with the approval of the Photon Factory Program Advisory Committee.
Funding Information:
Acknowledgment. This work was supported by JSPS (Japan Society for the Promotion of Science) KAKENHI, Grant-in-Aid for Scientific Research (B), Grant-in-Aid for JSPS Research Fellow, and the JSPS Bilateral Joint Research Project. This work was also performed under “Project for Bio-Imaging and Sensing at Utsunomiya University,” the Cooperative Research Program of “Network Joint Research Center for Materials and Devices,” and the auspices of the NIFS Collaboration Research Program. Measurements of the grating efficiency and the response of the x-ray CCD camera were performed with the approval of the Photon Factory Program Advisory Committee.
Publisher Copyright:
© 2018 Optical Society of America.
PY - 2018/5/1
Y1 - 2018/5/1
N2 - We demonstrated the upper limitation to the number of shots, i.e., target lifetime, together with the number of photons emitted in the water-window soft x-ray spectral region from a number of targets used as sources in this spectral region, for multi-shot irradiation at the same position on the target surface. The spectra involved result from unresolved transition arrays originating from n 3–n 4 transitions in medium-Z element plasmas and from n 4–n 4 transitions originating in high-Z plasmas. The output flux was maintained for the highest number of shots in the case of the high melting point element molybdenum, and the total output in the water window was 7.7 × 1013 photons∕sr at a laser power density of 1.2 × 101 W∕cm2.
AB - We demonstrated the upper limitation to the number of shots, i.e., target lifetime, together with the number of photons emitted in the water-window soft x-ray spectral region from a number of targets used as sources in this spectral region, for multi-shot irradiation at the same position on the target surface. The spectra involved result from unresolved transition arrays originating from n 3–n 4 transitions in medium-Z element plasmas and from n 4–n 4 transitions originating in high-Z plasmas. The output flux was maintained for the highest number of shots in the case of the high melting point element molybdenum, and the total output in the water window was 7.7 × 1013 photons∕sr at a laser power density of 1.2 × 101 W∕cm2.
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U2 - 10.1364/OL.43.002042
DO - 10.1364/OL.43.002042
M3 - Article
C2 - 29714741
AN - SCOPUS:85046650060
VL - 43
SP - 2042
EP - 2045
JO - Optics Letters
JF - Optics Letters
SN - 0146-9592
IS - 9
ER -