ZnO crystal as a potential damage-recoverable window material for fusion reactors

• Project/Area Number: 15K18304
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: Osaka University
• Principal Investigator: Yamanoi Kohei 大阪大学, レーザー科学研究所, 助教 (30722813)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 放射線損傷 / 光学材料 / 核融合 / 原子炉 / ZnO / 窓材料

Outline of Final Research Achievements

In nuclear reactors, space, and other scientific activities involving high-energy radiation such as gamma-ray, long-term exposure can produce serious radiation effects leading to the rapid deterioration of optical components. In optical glasses, high radiation doses create discoloration. Therefore, monitoring the optical performance of window materials can help mitigate potential damage. In this project, we investigate the effects of gamma-ray irradiation
and ion bombardments on the transmission and refractive index of ZnO crystal and sapphire . We also report a new method based on two right angle prism configuration and imaging spectrometer to measure the changes of refractive index before and after irradiation of a sample material.

Research Products

• [Int'l Joint Research] University of Philippine(フィリピン)
• [Int'l Joint Research] VAST/IOP(ベトナム)
• [Int'l Joint Research] Nakhon Pathom Rajabhat University(Thailand)
• [Int'l Joint Research] University of Philippines(Philippines)
• [Journal Article] Two-step fabrication of ZnO-PVP composites with tunable visible emissions (2018)
  • Author(s): Agulto Verdad C.、Empizo Melvin John F.、Kawano Keisuke、Minami Yuki、Yamanoi Kohei、Sarukura Nobuhiko、Yago Allan Christopher C.、Sarmago Roland V.
  • Journal Title: Optical Materials Volume: 76 Pages: 317-322
  • DOI: 10.1016/j.optmat.2017.12.048
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Optical damage assessment and recovery investigation of hydrogen-ion and deuterium-ion plasma-irradiated bulk ZnO single crystals (2017)
  • Author(s): M. F. Empizo, K Yamanoi, K Mori, K. Iwano, Y. Iwasa, Y. Minami, R. Arita, K. Fukuda, K. Takano, T. Shimizu, M. Nakajima, M. Yoshimura, N. Sarukura, T. Norimatsu, M. Hangyo, H. Azechi, T. Fukuda, B. G. Singidas, R. V. Sarmago, M. Oya, and Y. Ueda
  • Journal Title: Journal of Applied Physics Volume: 121 Issue: 17 Pages: 175102-175102
  • DOI: 10.1063/1.4982346
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Strong yellow emission of high-conductivity bulk ZnO single crystals irradiated with high-power gyrotron beam (2017)
  • Author(s): K. Kato, H. Qiu, E. M. Khutoryan, Y. Tatematsu, M. Tani,T. Idehara, Y. Yamaguchi, M. Fukunari, Y. Maeda, K. Takayama,Y. Minami, M. F. Empizo, T. Kurihara, K. Yamanoi, T. Shimizu, K. Takano, N. Sarukura, T. Fukuda, M. Yoshimura, and M. Nakajima
  • Journal Title: Appl. Phys. Lett Volume: 111 Issue: 3 Pages: 031108-031108
  • DOI: 10.1063/1.4994316
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Structural and optical characterization and scintillator application of hydrothermal-grown ZnO microrods (2017)
  • Author(s): Empizo Melvin John F.、Santos-Putungan Alexandra B.、Yamanoi Kohei、Salazar Hernanie T.、Anguluan Eloise P.、Mori Kazuyuki、Arita Ren、Minami Yuki、Luong Mui Viet、Shimizu Toshihiko、Estacio Elmer S.、Somintac Armando S.、Salvador Arnel A.、Sarmago Roland V.、Fukuda Tsuguo、Sarukura Nobuhiko
  • Journal Title: Optical Materials Volume: 65 Pages: 82-87
  • DOI: 10.1016/j.optmat.2016.09.004
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Optical transmittance investigation of 1-keV ion-irradiated sapphire crystals aspotential VUV to NIR window materials of fusion reactors (2016)
  • Author(s): K.Iwano, et al.,
  • Journal Title: AIP Advances Volume: 6 Issue: 10 Pages: 105108-105108
  • DOI: 10.1063/1.4965927
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ZnO crystal as a potential damage-recoverable window material for fusion reactors (2016)
  • Author(s): K.Yamanoi, et al.,
  • Journal Title: Optical Materials Volume: 62 Pages: 646-650
  • DOI: 10.1016/j.optmat.2016.10.058
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Intense and fast UV emitting ZnO microrods fabricated by low temperature aqueous chemical growth method (2016)
  • Author(s): Alexandra B. Santos-Putungan, Melvin John F. Empizo, Kohei Yamanoi, Ray M. Vargas, Ren Arita, Yuki Minami, Toshihiko Shimizu, Arnel A. Salvador, Roland V. Sarmago, Nobuhiko Sarukura
  • Journal Title: Journal of Luminescence Volume: 169 Pages: 216-219
  • DOI: 10.1016/j.jlumin.2015.08.079
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Blue-shifted and picosecond amplified UV emission from aqueous chemical grown ZnO microrods (2015)
  • Author(s): Melvin John F. Empizo, Kohei Yamanoi, Alexandra B. Santos-Putungan, Ren Arita, Yuki Minami, Mui Viet Luong, Toshihiko Shimizu, Elmer S. Estacio, Armando S. Somintac, Arnel A. Salvador, Roland V. Sarmago, Nobuhiko Sarukura
  • Journal Title: Optical Materials Volume: 48 Pages: 179-184
  • DOI: 10.1016/j.optmat.2015.07.041
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Gamma-ray irradiation effects on the optical properties of bulk ZnO single crystals (2015)
  • Author(s): Melvin John F. Empizo, Kohei Yamanoi, Kazuyuki Mori, Ren Arita, Keisuke Iwano, Masahiro Takabatake, Kazuhito Fukuda, Tatsuhiro Hori, Yuki Minami, Mui Viet Luong, Sadaoki Kojima, Yasunobu Arikawa, Toshihiko Shimizu, Nobuhiko Sarukura, Takayoshi Norimatsu, Hiroshi Azechi, Arnel A. Salvador, Roland V. Sarmago
  • Journal Title: APPLIED PHYSICS EXPRESS Volume: 8 Issue: 6 Pages: 061101-061101
  • DOI: 10.7567/apex.8.061101
  • NAID: 210000137524
  • Peer Reviewed / Int'l Joint Research
• [Presentation] GAMMA-RAY RADIATION RESISTANCE AND IMPROVED EMISSION LIFETIMES OFHYDROTHERMAL-GROWTH BULK ZnO SINGLE CRYSTALS (2017)
  • Author(s): Nobuhiko Sarukura
  • Organizer: 7th International Symposium on Optical Materials
  • Int'l Joint Research / Invited
• [Presentation] Optical characterization of fluoride glass as fast-response scintillator (2017)
  • Author(s): Kohei Yamanoi
  • Organizer: The First Materials Research Society of Thailand International Conference
  • Int'l Joint Research / Invited
• [Presentation] Effect of 1 keV ion bombardment on the optical characteristics of sapphire in VUV region (2015)
  • Author(s): Keisuke Iwano
  • Organizer: International Conference on Small Science 2015
  • Place of Presentation: Thailand
  • Year and Date: 2015-11-04
  • Int'l Joint Research
• [Presentation] Radiation Resistance and Improved Response Times of ZnO Scintillator after Gamma-Ray Irradiation (2015)
  • Author(s): Kohei Yamanoi
  • Organizer: International Conference on Small Science 2015
  • Place of Presentation: Thailand
  • Year and Date: 2015-11-04
  • Int'l Joint Research / Invited