Development of very-light segmented mirrors using chemically strengthened glasses for the CTA Large Size Telescopes

• Project/Area Number: 15K17640
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: Hayashida Masaaki 東京大学, 宇宙線研究所, 特任助教 (60705177)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 解像型大気チェレンコフ望遠鏡 / 高エネルギーガンマ線 / CTAプロジェクト

Outline of Final Research Achievements

We selected “Dragontrail X” for the new chemically strengthened glasses. Our conclusion is that the current 2.7mm thick soda glasses can be replaced by “Dragontrail X” with a 2.0mm thick to aim for the very-light segmented mirrors. Our full size segmented mirrors for the CTA Large Size Telescopes showed no damage after extensive temperature cycling tests. For the quality control during the mass production phase, we have successfully established a new `2f’ measurement system, which uses a point light source to measure the surface qualities of mirrors such as curvature radius and imaging performance. The system has been adapted as one of standard measurement systems for the CTA quality control.

Research Products

• [Journal Article] First minute-scale variability in Fermi-LAT blazar observations during the giant outburst of 3C279 in 2015 June (2017)
  • Author(s): Masaaki Hayashida, Greg Madejski, Roger Blandford, Katsuaki Asano, Stefan Larsson, for the Fermi-LAT Collaboration, Krzysztof Nalewajko, and Marek Sikora
  • Journal Title: AIP Conference Proceedings Volume: 1792 Pages: 050015-050015
  • DOI: 10.1063/1.4968961
  • Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Minute-timescale >100 MeV γ-Ray Variability during the Giant Outburst of Quasar 3C 279 Observed by Fermi-LAT in 2015 June (2016)
  • Author(s): Ackermann, M.,Anantua, R.,,,Hayashida,M.,,,et al (Fermi-LAT Collaboration, alphabetical order)
  • Journal Title: The Astrophysical Journal Letters Volume: 824 Issue: 2 Pages: L20-L20
  • DOI: 10.3847/2041-8205/824/2/l20
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Rapid Variability of Blazar 3C 279 during Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multiwavelength Observations (2015)
  • Author(s): Hayashida, M., Nalewajko, K., Madejski, G. M., et al.
  • Journal Title: The Astrophysical Journal Volume: 807 Issue: 1 Pages: 79-79
  • DOI: 10.1088/0004-637x/807/1/79
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Optical system for the Large Size Telescope of the Cherenkov Telescope Array (2015)
  • Author(s): M. Hayashida, K. Noda, M. Teshima, U. Barres de Almeida, M. Chikawa, N. Cho, S. Fukami, A. Gadola, Y. Hanabata, D. Horns, C. Jablonski, H. Katagiri, M. Kagaya, M. Ogino, A. Okumura, T. Saito, R. Stadler, S. Steiner, U. Straumann, A. Vollhardt, H. Wetteskind, T. Yamamoto and T. Yoshida for the CTA Consortium
  • Journal Title: Proceedings of Science (the 34th International Cosmic Ray Conference) Volume: PoS(ICRC2015) Pages: 927-927
  • Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] CTA 報告122: CTA大口径望遠鏡の光学性能最適化に向けた分割鏡測定とその配置の検討 (2017)
  • Author(s): 稲田知大、林田将明 他CTA-Japanコンソーシアム
  • Organizer: 日本物理学会2017年年次大会
  • Place of Presentation: 大阪大学（大阪府、豊中市）
  • Year and Date: 2017-03-17
• [Presentation] CTA 報告 116: CTA大口径望遠鏡用分割鏡性能評価と分割鏡最適化配置にむけたsimulation study (2016)
  • Author(s): 稲田知大、林田将明 他CTA-Japanコンソーシアム
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 宮崎大学 (宮崎県、宮崎市）
  • Year and Date: 2016-09-21
• [Presentation] 大口径望遠鏡初号機建設に向けた光学系最終デザインと品質管理 (2016)
  • Author(s): 林田将明 他CTA-Japanコンソーシアム
  • Organizer: 日本天文学会2016年秋季年会
  • Place of Presentation: 愛媛大学（愛媛県、松山市）
  • Year and Date: 2016-09-14
• [Presentation] First minute-scale variability in Fermi-LAT blazar observations during the giant outburst of 3C279 in 2015 June (2016)
  • Author(s): Masaaki Hayashida
  • Organizer: 6th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma2016)
  • Place of Presentation: Heidelberg (Germany)
  • Year and Date: 2016-07-11
  • Int'l Joint Research
• [Presentation] Very fast gamma-ray variability and Multi-wavelength view of 3C 279 during outbursts in 2013-2015 (2016)
  • Author(s): Masaaki Hayashida
  • Organizer: Blazars through Sharp Multi-Wavelength Eyes
  • Place of Presentation: Malaga (Spain)
  • Year and Date: 2016-05-30
  • Int'l Joint Research / Invited
• [Presentation] CTA 報告107：CTA大口径望遠鏡用分割鏡の性能評価 (2016)
  • Author(s): 長紀仁, 林田将明, 稲田知大、他CTA-Japan consortium
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県・仙台）
  • Year and Date: 2016-03-19
• [Presentation] CTA 大口径望遠鏡初号機の光学系開発状況と性能評価 (2015)
  • Author(s): 林田将明 他 CTA-Japan Consortium
  • Organizer: 日本天文学会2015年秋季年会
  • Place of Presentation: 甲南大学（兵庫県・神戸市）
  • Year and Date: 2015-09-09
• [Presentation] The Optical system for the Large Size Telescope of the Cherenkov Telescope Array (2015)
  • Author(s): Hayashida, M., Noda, K., Teshima, M., et al. for the CTA Consortium
  • Organizer: The 34th International Cosmic Ray Conference (ICRC2015)
  • Place of Presentation: Hague (Netherlands)
  • Year and Date: 2015-07-30
  • Int'l Joint Research
• [Presentation] Multi-wavelength observations of blazar 3C 279 during flaring states in 2013-2014 and a stochastic electron acceleration model (2015)
  • Author(s): Masaaki Hayashida, Krzysztof Nalewajko, Greg Madejski, Marek Sikora, Katsuaki Asano for the Fermi-LAT collaboration
  • Organizer: 14th Marcel Grossmann Meeting
  • Place of Presentation: Roma (Italy)
  • Year and Date: 2015-07-12
  • Int'l Joint Research / Invited
• [Presentation] Diversity of Multi-wavelength Behavior of Relativistic Jet in 3C 279 Discovered During the Fermi Era (2015)
  • Author(s): Masaaki Hayashida
  • Organizer: Relativistic Jets: Creation, Dynamics, and Internal Physics
  • Place of Presentation: Krakow (Poland)
  • Year and Date: 2015-04-20
  • Int'l Joint Research / Invited