低電離タングステンイオンの電子捕獲断面積測定 Cross Sections for Electron Capture Collision of W Ions

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1 低電離タングステンイオンの電子捕獲断面積測定 Cross Sections for Electron Capture Collision of W ons 京都大学工学研究科原子核工学専攻今井誠, 入来仁隆 Makoto MA, Yoshitaka RK Department of Nuclear Engineering, Kyoto University 原子分子データ応用フォーラムセミナー, NFS, Feb 19, 010

2 Status for charge transfer collision cross section of ions H, He Li, Be,, Ne Na,, Ar 以降 Fe, Cu, U 等ごく一部

3 Status for charge transfer collision cross sections for W Measured cross section for single electron capture by Meyer et al. at 8.5, 11 MeV (46, 60 kev/u) in PRA19, 515 (1979). W q+ + H, H, Ar (q = 6 15) 1.E 14 σ σ H Ar = =.4 10 q q ( cm ) ( cm ) 1E15 1.E

4 Status for charge transfer collision cross sections for W Measured cross section for single electron capture by Meyer et al. at 8.5, 11 MeV (46, 60 kev/u ) in PRA19, 515 (1979). W q+ + H, H, Ar (q = 6 15) Production (measurements) of electron capture cross sections for some fusion-related processes in Kyoto University W +, W + + He, Ne, Ar, Kr, H, N, CH 4, C H 6 Theoretical study of single ionization of W ion by Ar by V. P. Shevelko (P. N. Lebedev Physical nstitute, Russia) W + + Ar Theoretical study of electron capture of W ion by R. J. Buenker (Bergische Universität Wuppertal, Germany) W + + H, He, H

5 Production of Absolute Cross Sections for Fusion Related Electron Capture Processes Till 1994 Energy = (0.5) 5-3 kev C 1,,3+ + H, CO, CH 4, C H 6, C 3H Cr 1,+ + He, Ne, Ar, Kr, H, CO, CO, CH 4, C H 6, C 3 H 8 Be 1,+ + He, Ne, Ar, Kr, H, CO, CO, CH 4, C H 6, C 3 H 8 Be will be used as the First Wall Material in the TER! Ni 1,+ + He, Ne, Ar, Kr, H, CO, CO, N, CH 4, C H 6, C 3H Fe + + He, Ne, Ar, Kr, H, CO, CO, N, CH 4, C H 6, C 3 H 8 Be 1+ 1,+ + He, Ne, Ar, Kr, H, CO, CO B 1,+ + He, Ne, Ar, Kr, H, CO, CO 005 present W will be used for W +, W + + He, Ne, Ar, Kr, H, N, CH 4, C H 6 DVERTOR Buffle and Dome in the TER! AEA Coordinated Research Project (CRP) on Atomic Data for Heavy AEA Coordinated Research Project (CRP) on Atomic Data for Heavy Element mpurities ( ) requires data for elements with atomic mass 13; (Ar, Kr, Xe), Si, Cl, Cr, Fe, Ni, Cu, Mo and W!

6 10-15 He Ne Ar Kr o s s S e c t i o n (cm ) (a) Be +, + +, + (b) B H CH 4 C H 6 C r C 3 H 8 CO CO σ 10 σ 10 σ (a') Be +, + +, + (b') B σ 0 theories E n e r g y (kev/u) Single and double electron capture cross sections σ 10, σ 1 and σ 0 for Be and B ions. J. Plasma Fusion Res. SERES Vol.7, pp

7 10-15 σ 10 σ 1 He σ 0 Ar Layton et al Kr C r o s s S e c t i o n (cm ) (a) Fe + (b1) Ni + (b) Ni H CH 4 C H C 3 H 8 CO CO N (a') Fe + (b1') Ni + (b') Ni E n e r g y (ev/u) Single and double electron capture cross sections σ 10, σ 1 and σ 0 for Fe and Ni ions. J. Plasma Fusion Res. SERES Vol.7, pp

8 Pump Beam 0.9 MeV (0 kev/u) CO + The Experimental Apparatus Base Pressure < Pa Neutral Particle Rejector Accelerating Electrodes Deflector Einzel Lens Collision Cell Base Pressure < Pa Signal 1 MCP Accel. HV WWire < 16 KV on Source Chamber Wien Filter チャンネル径 1μm 開口率 60% MCP Biased Resistive Anode Collision Chamber Signal

9 Projectile W on Selection 7.5 kev W + Extraction 1E+4 WO + W + 1E+3 on Yie eld 1E+ W + WO + W + 1E+1 1E Wien Filter Electric Field q m

10 Pump Beam 0.9 MeV (0 kev/u) CO + The Experimental Apparatus Base Pressure < Pa Neutral Particle Rejector Accelerating Electrodes Deflector Einzel Lens Collision Cell Base Pressure < Pa Signal 1 MCP Accel. HV WWire < 16 KV on Source Chamber Wien Filter チャンネル径 1μm 開口率 60% MCP Biased Resistive Anode Collision Chamber Signal

11 How to Derive Cross Sections Rate equation for W i+ dfi intensity ( π ) where i ( ) : F π π : σ ji : d π F j ji i ij j i ( π) σ F ( π) σ, = i F i ( π ) = 1, Relative ntensity of W i+ ion Target Thickness (= Density Length in /cm ) Charge Transfer Cross Section (cm ) W j+ W i+ Under the Single Collision Condition, this simultaneous equation + reduces to where, 1, 0 : 0 = σ 10 π, = σ 1 π ntensity of W +, W + and W 0, respectively.,

12 Data Processing Growth Curve for 5 kev W + Bench mark for 7.5 kev H + + H collision = σ 10π 1 0,

13 Single Electron Capture Cross Sections for W + ons on Gas Targets at 10 and 5 kev (54 and 7 ev/u) 10 kev W + Single Electron Capture 5 kev W + Single Electron Capture C H 6 C H 6 Cross s Section (cm ) CH 4 Ar Kr N P CH 4 H P P Ne (7.5 kev) He Target onization Potential (ev) Target onization Potential (ev)

14 Single Electron Capture Cross Sections for W + ons on Gas Targets at 15 kev (8 ev/u) 15 kev W + Single Electron Capture C H 6 Cross s Section (cm ) CH 4 Kr He Target onization Potential (ev)