Development of a concave grating for measurement of the solar-chromospheric magnetic fields in hydrogen Lyman alpha

2013 Fiscal Year Final Research Report

• Project/Area Number: 23340052
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: HARA Hirohisa 国立天文台, SOLAR-C準備室, 准教授 (20270457)
• Co-Investigator(Renkei-kenkyūsha): KANO Ryohei 国立天文台, SOLAR-C 準備室, 助教 (70321586) ; NARUKAGE Noriyuki 国立天文台, 先端技術センター, 特任研究員 (50435806)
• Project Period (FY): 2011-11-18 – 2014-03-31
• Keywords: 太陽物理学 / 光学

Research Abstract

In this study we have developed a holographically-ruled spherical concave grating with a laminar groove shape in collaboration with a domestic optics company for a sounding-rocket experiment CLASP (Chromospheric Lyman-Alpha Spectro-Polarimeter). The measurement of magnetic fields in the solar chromosphere and the transition region is the primary objective of the experiment by detecting the linear polarization through a spectro-polarimetric observation in the hydrogen Lyman alpha at 121.6 nm. The evaluation after the fabrication of the master grating of 3000 grooves/mm with an effective area within 110 mm in diameter shows that we have succeeded to develop a spherical concave grating with a high absolute grating efficiency of 25+/-5%, which satisfies the specification of the CLASP. We also developed a UV light-source system for evaluation of the grating performance in imaging spectroscopy.

Research Products

• [Journal Article] Birefringence of magnesium fluoride in the vacuum ultraviolet and application to a half-waveplate (2013)
  • Author(s): Ishikawa, R., Kano, R., Bando, T., Suematsu, Y., Ishikawa, S., Kubo, M., Narukage, N., Hara, H., Tsuneta, S., Watanabe, H., Ichimoto, K., Aoki, K., and Miyagawa, K
  • Journal Title: Appl. Opt Volume: 52 Pages: 8205-8211
  • DOI: 10.1364/AO.52.008205
  • Peer Reviewed
• [Presentation] 太陽彩層・遷移層磁場観測を目指した遠紫外線域凹面回折格子の開発II (2014)
  • Author(s): 原弘久, 成影典之, 木挽俊彦, 春日恵美, 宮川健太, 青木邦哉, 笹井裕行, 武山芸英
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学(東京都)
  • Year and Date: 2014-03-20
• [Presentation] 太陽Lyα線偏光分光観測ロケット実験CLASP のSlit-jaw 光学系試作品の評価 (2014)
  • Author(s): 久保雅仁, 末松芳法, 鹿野良平, 坂東貴政, 原弘久, 勝川行雄, 成影典之, 常田佐久, 春日恵美, 青木邦哉, K. Kobayashi
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学(東京都)
  • Year and Date: 2014-03-20
• [Presentation] 真空紫外線に特化した高精密MgF2 波長板の開発 (2014)
  • Author(s): 石川遼子, 鹿野良平, 坂東貴政, 末松芳法, 石川真之介, 久保雅仁, 成影典之, 原弘久, 常田佐久, 渡邉皓子, 一本潔, 青木邦哉, 宮川健太
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学(東京都)
  • Year and Date: 2014-03-20
• [Presentation] Lyα線偏光分光観測ロケット実験CLASP の進捗状況とその観測計画 (2014)
  • Author(s): 鹿野良平, 坂東貴政, 成影典之, 石川遼子, 久保雅仁, 勝川行雄, 石川真之介, 加藤成晃, Giono Gabriel, 原弘久, 末松芳法, 清水敏文, 坂尾太郎, 宮川健太, 後藤基志, K. Kobayashi, J. Trujillo Bueno, and F. Auchere
  • Organizer: 日本天文学会
  • Place of Presentation: 国際基督教大学(東京都)
  • Year and Date: 2014-03-20
• [Presentation] 太陽彩層・遷移層磁場観測を目指した遠紫外線域凹面回折格子の開発I (2013)
  • Author(s): 原弘久, 石川遼子, 青木邦哉, 成影典之, 笹井浩行
  • Organizer: 日本天文学会
  • Place of Presentation: 埼玉大学(埼玉県)
  • Year and Date: 2013-03-21
• [Presentation] 太陽彩層Lyα線偏光分光観測装置CLASP で用いる凹面回折格子の波長分解能評価法の構築 (2012)
  • Author(s): 久保雅稔, 鹿野良平, 坂東貴政, 木挽俊彦, 石川遼子, 久保雅仁, 勝川行雄, 原弘久, 常田佐久, 成影典之, K. Kobayashi, D. Song
  • Organizer: 日本天文学会
  • Place of Presentation: 龍谷大学(京都府)
  • Year and Date: 2012-03-20
• [Remarks]
  • URL: http://hinode.nao.ac.jp/user/harahs/kakenhi_2011_2013.htm