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Internal electrostatic confinement fusion (慣性静電閉じ込め による核融合 )

Internal electrostatic confinement fusion (慣性静電閉じ込め による核融合 ). 論文紹介 by 白鳥昂太郎. Paper. Institute. Institute of Advanced Energy, Kyoto University Prof. Kiyoshi Yoshikawa's Research Group 京都大学エネルギー理工学研究所 　エネルギー生成研究部門 粒子エネルギー研究分野 吉川 潔　研究室 http://www.iae.kyoto-u.ac.jp/beam/index_j.html.

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Internal electrostatic confinement fusion (慣性静電閉じ込め による核融合 )

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  1. Internal electrostatic confinement fusion(慣性静電閉じ込めによる核融合) 論文紹介 by 白鳥昂太郎

  2. Paper

  3. Institute Institute of Advanced Energy, Kyoto UniversityProf. Kiyoshi Yoshikawa's Research Group 京都大学エネルギー理工学研究所 　エネルギー生成研究部門 粒子エネルギー研究分野吉川 潔　研究室 http://www.iae.kyoto-u.ac.jp/beam/index_j.html

  4. Brief introduction of Internal electrostatic confinement fusion : IECF • IECF is the scheme of injecting the ions and electrons towards the spherical center, trapping both species in the electrostatic self-field and giving rise to fusion in the dense core. (Fusion mechanism is not completely understood.) • For effective production of neutron, multi-well potential is needed. • Energy of neutron d+d→3He+n : 2.5 MeV d+t→4He+n : 14.1 MeV (d+3He→4He+p : 14.7 MeV)

  5. Background • The concept of IECF is conceived in 1950s. • The first purpose is to investigate the room temperature fusion system (for power source ?). →Not realistic… →Latest type, input 100W ⇔Output by fusion 1μW But… • IECF is a good neutron source. → Investigation is continued.

  6. The Machine Intensity of neutron d+d→3He+n : 2.5 MeV → 5×106 n/s (High voltage and ion current are unknown)

  7. Advantage of IECF compared with neutron source (example252Cf) • Mono-energetic spectrum • No decreasing by particle decay • Easy to operate • Able to use proton source (d+3He→4He+p : 14.7 MeV) Good application  Energy spectrum of neutron from 252Cf O.I. Batenkov et al., INDC(NDS)-146,(1983)

  8. Purpose of this paper • To measure ion current dependency of neutron yield (N∝I2) for investigating IEFC mechanism • To explain mechanism by theoretical calculation for offering the technical advantages ↑ • The structure of internal potential is unknown.→ fusion mechanism • Information for developing the technical progress : To optimize high voltage, current and to develop cooling system →Technical advantages

  9. Ion current dependency of neutron yield Calculation by multi-well potential: N∝I2(I=ion current) ⇔Experimental result: scales linearly I • Limitation of high voltage and current are 70kV and 15 mA, respectively. • Not to exceed the threshold for multi-well potential Perveance : I(mA)/V1.5(kV) > 2.2 Re-experiment by sufficient condition by using pulse current • I2 dependency over the threshold was confirmed.

  10. Result of theoretical calculation To construct the program by multi-well potential and to simulate the dependency of ion current • N∝I3 dependency exists in the high current region. →Increased ion current make multi-well potential unstable and this unstably increase the density of central region. ⇒The experiment to confirm this dependency in the high current region should be performed.

  11. Result of theoretical calculation To construct the program by multi-well potential and to simulate the dependency of ion current • N∝I3 dependency exists in the high current region. →Increased ion current make multi-well potential unstable and this unstably increase the density of central region. ⇒The experiment to confirm this dependency in the high current region should be performed.

  12. Conclusion • The dependency of ion current (N∝I2) by multi-well potential is confirmed. • There may be the dependency N∝I3 in the high ion current region. → The experiment should be performed.

  13. Progress after this experiment • Multi-well potential was first measured by the laser-induced fluorescence method. • To increase the nuetron intensity of D-D reaction → 2×108 n/s

  14. Future plan • Improvement of ion source Glow discharge ＋ Magnetron ion source • Intensity of neutron will be increased by one-order (108→109 n/s).

  15. Application

  16. Examples

  17. Mine sweeper  • Development with 7 organizations • They plan to operate this machine in Afghanistan.

  18. Why neutron source ? • It is very difficult to distinguish mine from other metals by metal detector. → mine/metals = 1/1000 under the ground →The plastic and ceramic mine cannot be detected. • The composition of TNT is known. →By measuring γ ray from TNT reacted with neutron and back scattered neutron by proton in TNT, we will be able to distinguish mine from other metals.

  19. What detect ? • γ ray from neutron capture : 1H(n,γ), 14N(n,γ) • Energy 1H(n,γ) : 2.22 MeV 14N(n,γ) : 10.8 MeV • CsI, NaI, BGO for detection • 10.8 MeV → Detected by BGO multi compton gamma camera

  20. BGO gamma compton camera • Expected performance (1m×1m field, 20cm depth, 30 g mine) ～106 n/cm2/s Efficiency 99.9% Miss identify 40%@ 10 min

  21. Other method 回転する鎖で地面をひたすら叩いて、 片っ端から爆発させる

  22. Summary • Present performance of IECF : 2×108 n/s. • IECF will be able to be used for several applications by adjusting neutron intensity. • Mine sweeper with IECF is planned.

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