High gain target design and optimization of implosion trajectory for stable implosion

• Project/Area Number: 15560714
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Osaka University
• Principal Investigator: MURAKAMI Masakatsu Osaka University, Institute of Laser Engineering, Associate Professor, レーザーエネルギー学研究センター, 助教授 (80192772)
• Project Period (FY): 2003 – 2004
• Project Status: Completed (Fiscal Year 2004)
• Budget Amount: ¥1,900,000 (Direct Cost: ¥1,900,000); Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000); Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: Inertial fusion / Rayleigh-Taylor instabilit / Theoretical model / Rocket equation / Numerical simulation / 数値シミュレーション / レーザー核融合 / 爆縮 / 流体シミュレーション / 理論・シミュレーション / 低エントロピー圧縮 / テーラードパルス

Research Abstract

A new scheme for fast ignition is proposed, in which the compressed DT main fuel is ignited by impact collision of another fraction of separately imploded DT fuel, which is accelerated in the hollow conical target to hyper-velocities in the order of 10^8 cm/sec. Its kinetic energy is directly converted into thermal energy corresponding to temperatures > 5 keV on the collision with the main fuel, and this self-heated portion plays the role of igniter. A preliminary two-dimensional radiation-hydrodynamic simulation shows substantial heating of the compressed core and thus the feasibility of the new scheme. High energy coupling efficiency, no need for a PW laser, and affordability of investigation in laboratories under rather well established physical understanding and experimental know-how - those are considered to be the notable advantages of the present scheme.

Research Products

• [Journal Article] A new twist for inertial fusion energy : Impact Ignition (2005)
  • Author(s): N.Murakami H.Nagatomo
  • Journal Title: Nuclear Instruments & Methods in Physics Research A 544 Pages: 67-75
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Ion energy spectrum of expanding laser-plasma with limited mass (2005)
  • Author(s): N.Murakami, Y.-G.Kang, et al.
  • Journal Title: Physics of Plasmas 12(In press)
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 「研究成果報告書概要(欧文)」より (2005)
  • Author(s): M.Murakami et al.
  • Journal Title: Nucl.Instruments & Methods in Phps.Research A 544 Pages: 67-75
• [Journal Article] Self-similar gravitational collapse of radiatively cooling spheres (2004)
  • Author(s): M.Murakami, K.Nishihara et al.
  • Journal Title: Astrophysical Journal 607 Pages: 879-889
  • NAID: 110003948270
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 「研究成果報告書概要(欧文)」より (2004)
  • Author(s): M.Murakami et al.
  • Journal Title: Astrophys.Jounal. 607 Pages: 879-889
• [Journal Article] Suppression of the Rayleigh-Taylor instability and its implication for the impact ignition (2004)
  • Author(s): H.Azechi et al.
  • Journal Title: Plasma Phys.Control.Fusion 46 Pages: 245-245
• [Patent(Industrial Property Rights)] 実用新案登録 (2004)
  • Inventor(s): 村上 匡且 他1名
  • Industrial Property Rights Holder: 村上 匡且 他1名
  • Industrial Property Number: 2004-052164
  • Filing Date: 2004-01-24
  • Acquisition Date: 2004-03-20
  • Description: 「研究成果報告書概要(和文)」より