Electron-Ion Collision Experiments at the High Density Ion Beams

• Project/Area Number: 16540363
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 原子・分子・量子エレクトロニクス・プラズマ
• Research Institution: National Institute for Fusion Science
• Principal Investigator: SAKAUE Hiroyuki National Institute for Fusion Science (NIFS), Coordination Research Center, Research Associate, 連携研究推進センター, 助手 (40250112)
• Co-Investigator(Kenkyū-buntansha): SAKURAI Makoto Kobe Univ., Physics, Assistant Professor, 理学部, 助教授 (90170646) ; HIRAYAMA Takato Rikkyo Univ., Physics, Assistant Professor, 理学部, 助教授 (40218821) ; YAMADA Ichihiro National Institute for Fusion Science (NIFS), Large Helical Device Project, Research Associate, 大型ヘリカル研究部, 助手 (80222371)
• Project Period (FY): 2004 – 2006
• Project Status: Completed (Fiscal Year 2006)
• Budget Amount: ¥3,700,000 (Direct Cost: ¥3,700,000); Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000); Fiscal Year 2005: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
• Keywords: electron impact / excitation process / Auger / ionization cross section

Research Abstract

The understanding of the interaction of electron-ion collision process is important not only for the control and diagnostic of plasma but also for the atomic physics at many atomic processes in high temperature plasma. The research of ionization process in the electron-ion collision have been done for a long time, and the data was offered to the plasma control, the diagnostics of plasma and so on. At present, however, there are few atomic data for the excitation processes of electron-ion collisions, because of its experimental difficulties such as a low signal-to-noise ratio due to a low target ion density and very small cross sections, etc.
We developed the exclusive high-density ion source for the collision experiments. Then, the original tandem type electrostatic energy analyzer was developed at the same time. We fine-tuned the electron energy analyzer using the Auger spectrum at the electron atom collisions.
We observed the NOO Auger spectrum in electron-Xe atom collisions. These Aug er electrons are emitted in following processes, e + Xe→Xe^<+*> (4d^95s^25p^6) + e + e
→Xe^2 + (4d^<10>5s^25p^4)+e_<ej>・
Then, Auger electrons of N_<4,5>O_<2,3>O_<2,3> are dominant. The line of N_<4,5>O_1O_<2,3> Auger processes are observed. The energy resolution of our spectrum is about 50meV. From these experiments, we ascertained that our energy analyzer was completed as the design.
We measured the ion beam current dependence of N_<4,5>O_<2,3>O_<2,3> Auger spectrum in electron-Xe collisions within the Xe^+ ion beam. When the Xe^+ ion beam current was 1.0 μA, Auger spectrum peaks were separated respectively. But at 6.0 μA, these Auger spectrum peaks are broading and shifted to the low energy side. These phenomena are attributed to the electric field distribution of the location where Auger electrons are generated. Therefore we can estimate the space charge effect for the Xe^+ ion by analyzing this spectrum. We required canceling out this space charge at the ejected electron spectroscopy in electron-ion collision. Then we are doing the tests of canceling out the space charge at present. One is the direct electron supply method using electron shower and another is the electric field supply method using a tungsten coil. From now on, we will establish the most suitable method of canceling out the ion space charge and try the ejected electron spectroscopy in the electron-ion collisions.

Research Products

• [Journal Article] Dielectronic recombination of He-like to C-like iodine ions (2007)
  • Author(s): H.Watanabe, H.Tobiyama, A.P.Kavanagh, Y.M.Li, N.Nakamura, H.A.Sakaue, F.J.Currell, S.Ohtani
  • Journal Title: Physical Review A 75 Pages: 12702-12702
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Interference between dielectronic and radiative recombination in electron-highly charged Bi (2007)
  • Author(s): H.Tobiyama, H.Nohara, A.P.Kavanagh, N.Nakamura, H.Watanabe, H.A.Sakaue, Y.Li, D.Kato, F.J.Currell, C.Yamada, S.Ohtani
  • Journal Title: Journal of Physics Conference Series 58 Pages: 239-242
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Resonant Electron Processes with Open-shell Highly Charged Ion Targets (2007)
  • Author(s): N.Nakamura, H.Tobiyama, H.Nohara, A.P.Kavanagh, H.Watanabe, H.A.Sakaue, Y.Li, D.Kato, F.J.Currell, S.Ohtani.
  • Journal Title: Journal of Physics Conference Series 58 Pages: 267-270
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Recent Activities at The Tokyo EBIT 2006 (2007)
  • Author(s): Nobuyuki Nakamura, Fred J.Currell, Daiji Kato, Anthony P.Kavanagh, Yueming Li, Shunsuke Ohtani, Hiroyuki A.Sakaue, Makoto Sakurai, Jian Sun, Satoshi Takahashi, Masahide Tona, Hirofumi Watanabe, Chikashi Yamada, Nobuo Yoshiyasu
  • Journal Title: Canadian Journal of Physics (to be published)
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Recent Activities at The Tokyo EBIT 2006 (2007)
  • Author(s): Nobuyuki Nakamura, Fred J.Currell, Daiji Kato, Anthony P.Kavanagh, Yueming Li, Shunsuke Ohtani, Hiroyuki A.Sakaue, Makoto Sakurai, Jian Sun, Satoshi Takahashi, Masahide Tona, Hirofumi Watanabe, Chikashi Yamada, Nobuo Yoshiyasu
  • Journal Title: to be published in Canadian Journal of Physics
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Interference between dielectromic and radiative recombination in electron-highly charged Bi (2007)
  • Author(s): H.Tobiyama, H.Nohara, A.P.Kavanagh, N.Nakamura, H.Watanabe, H.A.Sakaue, Y.Li, D.Kato, F.J.Currell, C.Yamada, S.Ohtani
  • Journal Title: Journal of Physics Conference Series 58 Pages: 239-242
• [Journal Article] Resonant Electron Processes with Open-shell Highly Charged Ion Targets (2007)
  • Author(s): N.Nakamura, H.Tobiyama, H.Nohara, A.P.Kavanagh, H.Watanabe, H.A.Sakaue, Y.Li, D.Kato, F.J.Currell, S.Ohtani
  • Journal Title: Journal of Physics Conference Series 58 Pages: 267-270
• [Journal Article] Total Electron Transfer Cross Sections for Highly Charged Ion - Alkali Metal Atom Collisions (2006)
  • Author(s): H.A.Sakaue, K.Hosaka, H.Tawara, I.Yamada, N.Nakamura, S.Ohtani, A.Danjo, M.Kimura, A.Matsumoto, M.Sakurai, M.Yoshino.
  • Journal Title: Journal of Plasma Fusion Research Series Vol.7 Pages: 195-195
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Total Electron Transfer Cross Sections for Highly Charged Ion-Alkali Metal Atom Collisions (2006)
  • Author(s): H.A.Sakaue, K.Hosaka, H.Tawara, I.Yamada, N.Nakamura, S.Ohtani, A.Danjo, M.Kimura, A.Matsumoto, M.Sakurai, M.Yoshino.
  • Journal Title: Journal of Plasma Fusion Research Series Vol.7 Pages: 195-195
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Total Electron Transfer Cross Sections for Highly Charged Ion-Alkali Metal Atom Collisions (2006)
  • Author(s): H.A.Sakaue, K.Hosaka, H.Tawara, I.Yamada, N.Nakamura, S.Ohtani, A.Danjo, M.Kimura, A.Matsumoto, M.Sakurai, M.Yoshino
  • Journal Title: Journal of Plasma Fusion Research Series Vol.7 Pages: 195-195
• [Journal Article] Development of electron beam ion source for nanoprocess using highly charged ions (2005)
  • Author(s): M.Sakurai, F.Nakajima, T.Fukumoto, N.Nakamura, S.Ohtani, S.Mashiko, H.A.Sakaue.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B 235 Pages: 519-519
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Development of electron beam ion source for nanoprocess using highly charged ions (2005)
  • Author(s): M.Sakurai, F.Nakajima, T.Fukumoto, N.Nakamura, S.Ohtani, S.Mashiko, H.A.Sakaue
  • Journal Title: Nucl.Instrum. Methods B235 Pages: 519-519
• [Journal Article] Total Electron Transfer Cross Sections for Highly Charged Ion - Alkali Metal Atom Collisions (2005)
  • Author(s): H.A.Sakaue, K.Hosaka, H.Tawara, I.Yamada, N.Nakamura, S.Ohtani, A.Danjo, M.Kimura, A.Matsumoto, M.Sakurai, M.Yoshino
  • Journal Title: J. Plasma Fusion Research (to be published)
• [Journal Article] Highly Charged Ion in Plasmas and Atomic Processes (2005)
  • Author(s): H.A.Sakaue, D.Kato
  • Journal Title: J.Vac.Soc.Jap.(真空) 48 Pages: 483-483