Osaka University

Hamamatsu-photonics K.k.

Masakatsu Murakami

Hirofumi Kan

Toshiyuki Kawashima

Nobuhiko Sarukura

Hiroshi Azechi

Ryo Yasuhara

Hiroyuki Furukawa

Noriaki Miyanaga

Yasukazu Izawa

Yoshinori Shimada

Katsunobu Nishihara

Keiji Nagai

Tatsuhiko Yamanaka

Hiroaki Nishimura

Takayoshi Norimatsu

Mitsuo Nakai

Atsushi Sunahara

Masahiro Nakatsuka

Keisuke Shigemori

Shigeaki Uchida

Vasilli Zhakhovski

Ryouji Matsui

Takahiro Hibino

Tomoharu Okuno

An object of the present invention is to efficiently improve uniformity of energy lines to be irradiated. A method of determining nuclear fusion irradiation coordinates according to the present invention is a method of calculating irradiation coordinates when energy lines are irradiated onto a nuclear fusion target, and comprises an initial arrangement step Sof virtually arranging electric charges Qat initial coordinates of the number of irradiation coordinates Non a spherical surface Sset by using random numbers, a coordinate analysis step Sof analyzing coordinates rof the electric charges Qin time series based on coulomb forces acting among the electric charges Qby constraining the coordinates ronto the spherical surface S, potential evaluation steps Sand Sof determining a timing at which potential energies of the electric charges Qwere stabilized based on the coordinates r, and an irradiation coordinate deriving step Sof deriving coordinates rat the timing at which potential energies were stabilized as irradiation coordinates of energy lines in a case where a nuclear fusion target is arranged at the center of the spherical surface S.

Method of determining nuclear fusion irradiation coordinates, device for determining nuclear fusion irradiation coordinates, and nuclear fusion device

An object of the present invention is to provide an extreme ultraviolet light source target which can emits extreme ultraviolet light with high emission efficiency. A solid target made of heavy metal or heavy-metal compound and having a density 0.5 to 80% that of the crystal density is used. When the target is irradiated with a laser beam, plasma of the heavy metal contained in the target is generated, and extreme ultraviolet light having a predetermined wavelength which corresponds to the kind of the heavy metal is emitted from the plasma. When the density of the target is made to be smaller than the crystal density as described above, space distribution of the density of the generated plasma can be controlled, and the region in which plasma absorbs energy of the laser beam overlaps the region in which the plasma emits the extreme ultraviolet light. Thus, emission efficiency can be improved, preventing energy loss. For example, in a case where the SnOtarget having a density 24% of the crystal density is used, the emission efficiency at around 13.5 nm wavelength is higher than in the case where a Sn crystal target is used.

Extreme ultraviolet light source and extreme ultraviolet light source target

Growing community of inventors

Suita, Japan

Masakatsu Murakami