Formation and investigation of electron-positron plasma in a dipole magnetic field configuration

• Project/Area Number: 25707043
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Plasma science
• Research Institution: The University of Tokyo
• Principal Investigator: SAITOH Haruhiko 東京大学, 大学院新領域創成科学研究科, 客員共同研究員 (60415164)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2014: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000); Fiscal Year 2013: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
• Keywords: 反物質プラズマ / ダイポール磁場 / 電子陽電子プラズマ / 低速陽電子ビーム / 高温超伝導線材 / 陽電子ビーム / 非中性プラズマ / カオス / プラズマ・核融合 / 陽電子プラズマ

Outline of Final Research Achievements

Toward the formation of electron-positron plasmas in a laboratory, experiments with intense slow positron beam were conducted in a dipole magnetic configuration. In a prototype dipole experiment with a permanent magnet, operated at the NEPOMUC positron facility, 100% lossless injection into closed magnetic surfaces, trapping for more than 1 s, and orbit manipulation were demonstrated for 5 eV positron beam. Based on these experimental results, development of a levitated dipole experiment was conducted, including the levitation system, efficient direct cooling of a high temperature superconducting (HTS) coil winding, fabrication of HTS coils to be used for the confinement of plasmas.

Research Products

• [Int'l Joint Research] マックスプランク・プラズマ物理研究所/ミュンヘン工科大学(ドイツ)
• [Int'l Joint Research] マックスプランク・プラズマ物理研究所/ミュンヘン工科大学(ドイツ)
• [Int'l Joint Research] カリフォルニア大学/ローレンス大学(米国)
• [Int'l Joint Research] マックスプランク・プラズマ物理研究所/ミュンヘン工科大学(ドイツ)
• [Int'l Joint Research] カリフォルニア大学/ローレンス大学(米国)
• [Journal Article] Manipulation of positron orbits in a dipole magnetic field with fluctuating electric fields (2018)
  • Author(s): H. Saitoh, J. Horn-Stanja, S. Nissl, E.V. Stenson, U. Hergenhahn, T. Sunn Pedersen, M. Singer, M. Dickmann, C. Hugenschmidt, M R. Stoneking, J.R. Danielson, and C.M. Surko
  • Journal Title: AIP Conference Proceedings Volume: 1928 Pages: 0200131-6
  • DOI: 10.1063/1.5021578
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Progress of the APEX experiment for creation of an electron-positron pair plasma (2018)
  • Author(s): U. Hergenhahn, J. Horn-Stanja, S. Nissl, T. Sunn Pedersen, H. Saitoh, E.V. Stenson, M.R. Stoneking, M. Dickmann, C. Hugenschmidt, M. Singer, J.R. Danielson, and C.M. Surko
  • Journal Title: AIP Conference Proceedings Volume: 1928 Pages: 0200041-11
  • DOI: 10.1063/1.5021569
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Toward a compact levitated superconducting dipole for positron-electron plasma confinement (2018)
  • Author(s): M.R. Stoneking, H. Saitoh, M. Singer, E.V. Stenson, J. Horn-Stanja, T. Sunn Pedersen, S. Nissl, U. Hergenhahn, N. Yanagi, C. Hugenschmidt, M. Dickmann, J.R. Danielson, and C.M. Surko
  • Journal Title: AIP Conference Proceedings Volume: 1928 Pages: 0200151-6
  • DOI: 10.1063/1.5021580
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 低エネルギー陽電子を用いた電子-陽電子プラズマ研究 (2017)
  • Author(s): H. Higaki, J. Horn-Stanja, E.V. Stenson, H. Saitoh, U. Hergenhahn, T. Sunn Pedersen, M. Singer, M. Dickmann, and C. Hugenschmidt
  • Journal Title: 原子衝突学会誌「しょうとつ」 Volume: 14 Pages: 15-24
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Chaos of energetic positron orbits in a dipole magnetic field and its potential application to a new injection scheme (2016)
  • Author(s): H. Saitoh, Z. Yoshida, Y. Yano, M. Nishiura, Y. Kawazura, J. Stanja, and T. Sunn Pedersen
  • Journal Title: Physical Review E Volume: 94 Issue: 4 Pages: 043203-043203
  • DOI: 10.1103/physreve.94.043203
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Characterization of the NEPOMUC primary and remoderated positron beams at different energies (2016)
  • Author(s): J. Stanja, U. Hergenhahn, H. Niemann, N. Paschkowski, T. Sunn Pedersen, H. Saitoh, E. V. Stenson, M. R. Stoneking, C. Hugenschmidt, and C. Piochcz
  • Journal Title: Nuclear Instruments and Methods in Physics Research A Volume: 827 Pages: 52-52
  • DOI: 10.1016/j.nima.2016.04.093
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Efficient injection of an intense positron beam into a dipole magnetic field (2015)
  • Author(s): H. Saitoh, J. Stanja, E. V. Stenson, U. Hergenhahn, H. Niemann, T. Sunn Pedersen, M. R. Stoneking, C. Piochacz, and C. Hugenschmidt
  • Journal Title: New Journal of Physics Volume: 17 Issue: 10 Pages: 103038-103038
  • DOI: 10.1088/1367-2630/17/10/103038
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Recent status of A Positron-Electron Experiment (APEX) (2014)
  • Author(s): H. Saitoh, T. S. Pedersen, U. Hergenhahn, E. V. Stenson, N. Paschkowski, and C. Hugenschmidt
  • Journal Title: Journal of Physics: Conference Series (Proceedings of the 13th International Workshop on Slow Positron Beam Techniques and Applications) Volume: 505 Pages: 0120451-4
  • DOI: 10.1088/1742-6596/505/1/012045
  • Peer Reviewed
• [Presentation] Development status of a levitated dipole experiment for pair-plasma production (2017)
  • Author(s): H. Saitoh, J. Horn-Stanja, E. V. Stenson, U. Hergenhahn, M. Singer, M. R. Stoneking, N. Yanagi
  • Organizer: ドイツ物理学会春季大会
  • Place of Presentation: ブレーメン大学（ブレーメン，ドイツ）
  • Year and Date: 2017-03-13
• [Presentation] Chaotic long orbits of energetic positrons in a dipole magnetic field configuration (2017)
  • Author(s): H. Saitoh, J. Horn-Stanja, E.V. Stenson, M. Singer, U. Hergenhahn, T. Sunn Pedersen, Y. Kawazura, Y. Yano, M. Nishiura, and Z. Yoshida
  • Organizer: 12th International Workshop on Non-neutral Plasmas
• [Presentation] Injection and manipulation of positron beam in a dipole magnetic field toward the creation of electron-positron pair plasmas (2017)
  • Author(s): H. Saitoh, J. Horn-Stanja, E.V. Stenson, U. Hergenhahn, T. Sunn Pedersen, M. Singer, M. Dickmann, C. Hugenschmidt, M.R. Stoneking, and J.R. Danielson
  • Organizer: 1st Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2017)
  • Invited
• [Presentation] ダイポール磁場配位を用いた陽電子閉じ込め研究の進展 (2017)
  • Author(s): 齋藤晴彦，T. Sunn Pedersen, J. Horn-Stanja, E.V. Stenson, U. Hergenhahn, M. Singer, M. Dickmann, C. Hugenschmidt, M.R. Stoneking, and J.R. Danielson
  • Organizer: 物理学会第73回年次大会
• [Presentation] Progress toward the creation of magnetically confined pair-plasmas (2016)
  • Author(s): H. Saitoh, U. Hergenhahn, H. Niemann, N. Paschkowski, T. Sunn Pedersen, J. Stanja, E. V. Stenson, M. R. Stoneking, C. Hugenschmidt, C. Piochacz, S. Vohburger, L. Schweikhard, J. R. Danielson, and C. M. Surko
  • Organizer: 6th East-Asia School and Workshop on Laboratory, Space, and Astrophysical plasmas
  • Place of Presentation: エポカルつくば（茨城県つくば市）
  • Year and Date: 2016-07-11
  • Int'l Joint Research / Invited
• [Presentation] Progress toward the creation of magnetically confined pair-plasmas (2016)
  • Author(s): H. Saitoh, U. Hergenhahn, H. Niemann, N. Paschkowski, T. Sunn Pedersen, J. Stanja, E. V. Stenson, M. R. Stoneking, C. Hugenschmidt, C. Piochacz, S. Vohburger, L. Schweikhard, J. R. Danielson, and C. M. Surko
  • Organizer: ドイツ物理学会春季大会
  • Place of Presentation: ハノーファー大学（ハノーファー，ドイツ）
  • Year and Date: 2016-02-29
• [Presentation] Recent status of the PAX and APEX projects toward the formation of electron-positron plasma (2015)
  • Author(s): U. Hergenhahn, H. Niemann, N. Paschkowski, T. Sunn Pedersen, H. Saitoh, J. Stanja, E. V. Stenson, M. R. Stoneking, C. Hugenschmidt, C. Piochacz, S.Vohburger, G. H. Marx, L. Schweikhard, J. R. Danielson, and C. M. Surko
  • Organizer: 25th International Toki Conference (ITC-25)
  • Place of Presentation: セラトピア土岐（岐阜県土岐市）
  • Year and Date: 2015-11-03
  • Int'l Joint Research
• [Presentation] Status of A Positron-Electron Experiment (APEX) towards the formation of pair plasmas (2014)
  • Author(s): H. Saitoh, J. Stanja, T. Sunn Pedersen, U. Hergenhahn, E. V. Stenson, H. Niemann, N. Paschkowski, C. Hugenschmidt, G. H. Marx, L. Schweikhard, J. R. Danielson, C. M. Surko
  • Organizer: 11th International Workshop on Non-neutral Plasmas
  • Place of Presentation: サンポートホール高松（香川県高松市）
  • Year and Date: 2014-12-01 – 2014-12-04
  • Invited
• [Presentation] Injection and trapping of electrons in a dipole magnetic field: towards the formation of an electron-positron plasma (2014)
  • Author(s): H. Saitoh, T. Sunn Pedersen, U. Hergenhahn, E. V. Stenson, J. Stanja, N. Paschkowski, C. Hugenschmidt
  • Organizer: 41st EPS Conference on Plasma Physics
  • Place of Presentation: bcc Berlin Congress Center，ベルリン（ドイツ）
  • Year and Date: 2014-06-23 – 2014-06-27
• [Presentation] Recent status of A Positron-Electron Experiment (APEX) (2013)
  • Author(s): H. Saitoh, T. S. Pedersen, U. Hergenhahn, E. V. Stenson, N. Paschkowski, and C. Hugenschmidt
  • Organizer: 13th International Workshop on Slow Positron Beam Techniques and Applications
  • Place of Presentation: ドイツ ガルヒン ミュンヘン工科大学
• [Presentation] Trapping properties of magnetic dipole fields (2013)
  • Author(s): H. Saitoh, T. S. Pedersen, U. Hergenhahn, E. V. Stenson, N. Paschkowski, and C. Hugenschmidt
  • Organizer: Physics of Electron-Positron Plasma Workshop
  • Place of Presentation: ドイツ グライフスヴァルト マックスプランク・プラズマ物理研究所