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Statistical properties of laser-cooled Ca ions in a quadrupole toroidal rf trap

Research Project

Project/Area Number 13680555
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field プラズマ理工学
Research InstitutionNagoya University

Principal Investigator

SAKAWA Youichi  Nagoya University, Graduate school of Engineering, Research Associate, 工学研究科, 助手 (70242881)

Co-Investigator(Kenkyū-buntansha) ARAMAKI Mitsutoshi  Nagoya University, Graduate school of Engineering, Research Associate, 工学研究科, 助手 (50335072)
HAYASAKA Kazuhiro  Nagoya University, Communication Research Laboratory, Chief Researcher, 主任研究員
SHOJI Tatsuo  Nagoya University, Graduate school of Engineering, Associate Professor, 工学研究科, 助教授 (50115581)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywordstoroidal rf trap / laser cooling / one component plasma / statistical properties
Research Abstract

In our experiments, ions are confined in a toroidal rf trap and Coulomb coupling parameter >1 is achieved by laser cooling. In order to cool Ca+ ions, the 397 nm radiation, obtained by frequency doubling of the 794 nm radiation using a LBO crystal placed in the external cavity, and the 866 nm radiation are constructed using diode lasers.
In 2001, to achieve stable radiations of 397 nm and 866 nm from diode lasers, we have constructed grating-laser-stabilization systems by means of feedback from holographic gratings in the Littrow configuration for both diode lasers. As a result, stabilization of diode lasers in frequency, intensity, and pointing has been achieved. We have controlled the Ca+ ion temperature by means of He buffer-gas-cooling ; and measured confinement time, velocity distribution function, and density profile of Ca+ ions using laser-induced fluorescence (LIF) method.
In 2002, we have constructed the second 397 nm laser as a probe laser in addition to the cooling laser, in order to measure the statistical properties of laser-cooled Ca+ ions, such as velocity distribution function and density profile using LIF method. The optical feedback phase and the frequency of the grating-stabilized laser are simultaneously controlled by 1f and 3f electric feedback, respectively, using a proportional and integral (PI) feedback method, and the frequency scan of nearly 5 GHz is achieved.
We have conducted LIF measurements of Ca+ ions using two toroidal rf traps ; one is 2 mm and the other is 4 mm in the distance between the neighboring electrodes (the major radius is 40 mm in both traps). Whereas the 2 mm trap has shown no LIF signals without the buffer-gas cooling, the 4 mm trap has shown the evidence for trapped Ca+ ions even at the base pressure. Laser-cooling experiments are in progress using the 4 mm trap.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 荒巻光利, 坂和洋一, 庄司多津男, 早坂和弘: "トロイダルRFイオントラップ中でバッファガス冷却された一成分プラズマのレーザー誘起蛍光法を用いた測定"プラズマ・核融合学会誌. 77(5). 476-583 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Aramaki, Y.Sakawa, T.Shoji, K.Hayasaka: "Velocity distributions and density profiles of buffer-gas cooled one component plasma in toroidal rf trap"Journal of Plasma and Fusion Research SERIES. 4. 309-312 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Aramaki, Y.Sakawa, T.Shoji, and K.Hayasaka: "Laser-induced fluorescence measurement of buffer-gas-cooled one-component plasma in troidal rf ion trap"Journal of Plasma and Fusion Research. 77 (5). 476-483 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Aramaki, Y.Sakawa, T.Shoji, and K.Hayasaka: "Velocity distributions and density profiles of buffer-gas cooled one component plasma in toroidal rf trap"Journal of Plasma and Fusion Research SERIES. 4. 309-312 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 荒巻光利, 坂和洋一, 庄司多津男, 早坂和弘: "トロイダルRFイオントラップ中でバッファガス冷却された一成分プラズマのレーザー誘起蛍光法を用いた測定"プラズマ・核融合学会誌. 77(5). 476-583 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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