Atomic and Molecular Data Activities for Fusion Research in JAEA. T. Nakano Japan Atomic Energy Agency

Transcription

1 "Technical Aspects of Atomic and Molecular Data Processing and Exchange" (20th Meeting of the Atomic and Molecular Data Centres and ALADDIN Network), 7-9 September 2009, IAEA HQ, Vienna, Austria Atomic and Molecular Data Activities for Fusion Research in JAEA T. Nakano Japan Atomic Energy Agency

2 Organization Staff T. Nakano: Experimental research on nuclear fusion plasmas in the JT-60U tokamak A member of ITPA SOL and Divertor plasma physics topical group M. Sataka: Experimental research on atomic collision with the TANDEM accelerator Some other contributors in JAEA (H. Kubo, A. Sasaki, K. Moribayashi,,,)

3 JT-60U Recent activities Compilation, evaluation and production of Cross sections for important collisions in cold divertor plasmas Spectral data for heavy atoms ( W etc. ) Performed by sponsored research and experimental research in JT-60U Main plasma T= 1 ~ 20 kev n w /n e <0.01% (radiation loss) Ar enhances radiation Be ITER Divertor plasma T= 0.1 ~ 200 ev W D(T), D(T) 2, He, Be, C, C x D(T) y process C and W yield C

4 Sponsored research Contr actor Year Niigata Univ. Shimakura Kitasato Univ. Tagagi Osaka Nucl. Sci. Association Tabata / Hori Nagoya Univ. Matsunami Kyoto Univ. Ito / Imai Univ. of Electro- Com. Ohtani 2007 B 5+ + H(n=2) C 6+ + H(n=2) - Analytic expression: He collision systems Chemical sputtering of impurity doped C W + => W 0 Spectral data of W ~30+ in UV range 2008 Be + + H(n=2) Be 3+ + H(n=2) (New method) H e- Analytic expression: He collision systems Chemical sputtering of C by O + W 2+ => W 1+ Spectral data of W ~30+ in UV range 2009 ongoing C 4+ + H(n=2) C 5+ + H(n=2) (New method) H e- Analytic expression: He collision systems Chemical sputtering of deposited C by O + Finished Finished

5 Contents Our actives since the last meeting in Oct., Cross section 1.1 Compilation and evaluation Analytic expression for He collision systems Compilation of charge changing cross section Compilation of chemical sputtering yield 1.2 Production Electron capture of W + and W 2+ Charge exchange of Be 2+,3+ & C 4+,5+ with H(n=2) Dissociative recombination of H Spectral data 2.1 Production Identification of W ~60+ 3s-3p & 3p-3d lines in JT-60U Identification of W ~30+ forbidden lines in near UV range

6 Contents Our actives since the last meeting in Oct., Cross section 1.1 Compilation and evaluation Analytic expression for He collision systems Compilation of charge changing cross section Compilation of chemical sputtering yield 1.2 Production Electron capture of W + and W 2+ Charge exchange of Be 2+,3+ & C 4+,5+ with H(n=2) Dissociative recombination of H Spectral data 2.1 Production Identification of W ~60+ 3s-3p & 3p-3d lines in JT-60U Identification of W ~30+ forbidden lines in near UV range

7 Cross section ( cm 2 ) Analytic expression of Cross Sections of He and He + with H, H 2, He and Li He 2+ + He -> He + + He + After Redbook, new data became available Compiled by the JAEA sponsored research with Kyoto Univ. (Ito & Imai). Analytic expression reevaluated. 214 revised and new expressions in these 4 years ( to be submitted to a JAEA report ) Energy ( ev / amu ) * ) JAEA sponsored research with Tabata and Hori of Osaka Nucl. Sci. Association

8 Analytic expression of Cross Sections available in JAEA Website Click

9 Click

10 Click

11 Click

12 Analytic expression of Cross Sections available in JAEA Website Click 1242 figures available He collision systems in progress

13 Analytic expression of Cross Sections available in JAEA Website 412 Fortran functions available He collision systems in progress

14 Contents Our actives since the last meeting in Oct., Cross section 1.1 Compilation and evaluation Analytic expression for He collision systems Compilation of charge changing cross section Compilation of chemical sputtering yield 1.2 Production Electron capture of W + and W 2+ Charge exchange of Be 2+,3+ & C 4+,5+ with H(n=2) Dissociative recombination of H Spectral data 2.1 Production Identification of W ~60+ 3s-3p & 3p-3d lines in JT-60U Identification of W ~30+ forbidden lines in near UV range

15 Compilation of Charge-Changing Cross Section* Number of Collected Papers Year Total Partial Misc Sum Sum Journals under the survey Atomic Data and Nuclear Data Tables The European Physical Journal D Europhysics Letters JETP JETP Letters Journal of Physical and Chemical Reference Data Journal of the Physical Society of Japan Journal of Physics B: Atomic, Molecular and Optical Physics Nuclear Instruments and Methods in Physics Research sect. A Nuclear Instruments and Methods in Physics Research sect. B Physica Scripta Physical Review A Physics Letters A * ) JAEA sponsored research with A. Itoh and M. Imai of Kyoto Univ.

16 Example of complied cross sections

17 Contents Our actives since the last meeting in Oct., Cross section 1.1 Compilation and evaluation Analytic expression for He collision systems Compilation of charge changing cross section Compilation of chemical sputtering yield 1.2 Production Electron capture of W + and W 2+ Charge exchange of Be 2+,3+ & C 4+,5+ with H(n=2) Dissociative recombination of H Spectral data 2.1 Production Identification of W ~60+ 3s-3p & 3p-3d lines in JT-60U Identification of W ~30+ forbidden lines in near UV range

18 Electron capture cross section of W + * ) new data since 2007 * ) JAEA sponsored research with A. Itoh and M. Imai of Kyoto Univ.

19 Electron capture cross section of W 2 * ) all new data since 2007 This sponsored research was finished in FY 2008 * ) JAEA sponsored research with A. Itoh and M. Imai of Kyoto Univ.

20 Contents Our actives since the last meeting in Oct., Cross section 1.1 Compilation and evaluation Analytic expression for He collision systems Compilation of charge changing cross section Compilation of chemical sputtering yield 1.2 Production Electron capture of W + and W 2+ Charge exchange of Be 2+,3+ & C 4+,5+ with H(n=2) Dissociative recombination of H Spectral data 2.1 Production Identification of W ~60+ 3s-3p & 3p-3d lines in JT-60U Identification of W ~30+ forbidden lines in near UV range

21 Production of charge exchange cross sections* State-selective electron capture cross sections for Be 2+,Be 3+,B 5+,C 4+,C 5+,C 6+ with H*(n=2) at ev/amu calculated by the closed coupling method without the stark mixing. Previous method; used were the stark mixed states: ex.) Σ state: H* feels electric filed from the projectile X q+ if H* is at finite R. Present method; pure 2s & 2p state were used: Closed-coupling equation was solved from finite R. * ) JAEA sponsored research with N. Shimakura of Niigata Univ.

22 Comparison of the previous (Stark mixed H(n=2) states) and the new data ( Pure H(n=2) state ) Cross section ( cm 2 ) Be 2+ + H*(n=2) Be 2+ + H(SP + ) Be 2+ + H(2s) Ψ 2s = 0.70Φ SP Φ SP- R max = 80 au Be + (total) Be + (4l) Be + (3l) Be + (5l) Energy ( kev / amu ) With decreasing energy, difference becomes large

23 Data application: Collisional-Radiative model for C IV* C IV (Li-like) C V n=7 n=6 n=5 n=4 n=3 (De) Excitation 2s -64.5eV Ionization Radiative,3-body recomb. Spontaneous transition Dielectronic recomb. Charge exchange recomb. D 0 D + n=2-3.4ev n=1-13.6ev A coef. & (De) excitation: n<5 ADAS n>6 Hydrogenic approx. Ionization, 3-body recomb.: ECIP approx. Radiative & Dielectronic recomb.: n < 10 Nahar Charge exchange recomb.: D(n=1): ADAS D(n=2):Shimakura Solution of Rate Equation nc 3+ (p) = R 0 n e n CV (Recombining ) + R 0' n D n CV (CX-Recomb. ) + R 1 n e n CIV (Ionizing ) * ) T. Nakano et al., J. Plasma Fusion Res. 80 (2004) 500.

24 Calculated population of C IV* Population / Statistical Weight Recombnation + Ionization Recombination Ionization Experiment (Normailised by n(3p)) Recombination with CX Principal Quantum Number 20 Calculation conditions: T e = 20 ev n e = 1.7x10 20 m -3 T D = 70 ev n D = 1.0x10 18 m -3 n CIV / n CV = 0.1 Charge transfer recombination with D (n=2) is one of the excitation processes of high n levels * ) T. Nakano et al., J. Plasma Fusion Res. 80 (2004) 500.

25 Contents Our actives since the last meeting in Oct., Cross section 1.1 Compilation and evaluation Analytic expression for He collision systems Compilation of charge changing cross section Compilation of chemical sputtering yield 1.2 Production Electron capture of W + and W 2+ Charge exchange of Be 2+,3+ & C 4+,5+ with H(n=2) Dissociative recombination of H Spectral data 2.1 Production Identification of W ~60+ 3s-3p & 3p-3d lines in JT-60U Identification of W ~30+ forbidden lines in near UV range

26 Molecular Assisted Recombination MAR: Charge exchange : H + + H 2 (v) => H + H 2+ (v ) Dissociative recomb: H 2+ (v ) + e - => H + H* H 2 works like a catalyst for H + recombination The rate coefficient depends on v and v State specific (rot.&vib.) cross sections are calculated* implemented in the H 2 collisional-radiative model** modeling of JT-60U detached divertor plasmas ( H and H 2 spectral line/band analysis) * ) JAEA sponsored research with H. Takagi of Kitasato Univ. **) K. Sawada and T. Fujimoto, Phys. Rev. E 49 (1994) 5565.

27 Progress of dissociative recombination rate calculation Cal.( 95)*: [Method] 1 st order perturbation Cal( 99): The five Rydberg serieses are included besides the lowest dissociative state For a non-adiabatic mechanism between continuum and infinite Rydberg states [Method] Multi-channel Quantum Defect Theory including dissociative channels: The closed dissociative channels of core-excited dissociative states is include** Cal.( 09)*: For a mechanism by the electro-static interaction [Method] Non-perturbative solution of Lippmann-Schwinger equation with newly justified interactions*** Rate coefficient ( cm 3 /s ) * ) JAEA sponsored research with H. Takagi of Kitasato Univ. **) H. Takagi Phys. Scr T96 (2002) 52. ***)H. Takagi et al., Phys. Rev. A 79 (2009) HD + dissociative recomb.*** (v=0, Tr=300k) Cal.( 09) Cal.( 99) Exp. Cal.( 95) Collision energy ( ev )

28 Contents Our actives since the last meeting in Oct., Cross section 1.1 Compilation and evaluation Analytic expression for He collision systems Compilation of charge changing cross section Compilation of chemical sputtering yield 1.2 Production Electron capture of W + and W 2+ Charge exchange of Be 2+,3+ & C 4+,5+ with H(n=2) Dissociative recombination of H Spectral data 2.1 Production Identification of W ~60+ 3s-3p & 3p-3d lines in JT-60U Identification of W ~30+ forbidden lines in near UV range

29 Identification of W ~60+ 3s-3p & 3p-3d lines in JT-60U Tungsten as a plasma-facing component Merit : high melting point => compatible with high temp. plasma : low hydrogen (T) retention => safety, economy : low sputtering yield => long lifetime Demerit : high Z (74) => highly radiative( allowable n W /n e < 10-4 ) W => accumulation in the core plasma* ) ITER Highly charged W ions from a view point of atomic physics Atomic structure, CI, QED,,,, Interface between atomic physics and fusion research spectral data ( wavelength, A coeff. ) W density collisional data (ioniz./recomb coeff.) ( W charge state distribution ) High temp. plasma of JT-60U ( > 10 kev ) can produce highly charged W ions ( > 60+). Studies of atomic physics are possible, contributing to plasma physics. * ) T. Nakano et al., submitted to Nucl. Fusion

30 W ~60+ (3s-3p,3p-3d) at 2 nm identified in JT-60U* ) Intensity (a.u.) kev 12 kev 3 kev 0.0 F-like W 65+ Ne-like W 64+ Na-like W 63+ Mg-like W 62+ Al-like W 61+ Si-like W 60+ P-like W 59+ S-like W 58+ Cl-like W 57+ Ar-like W 56+ K-like W 55+ Ca-like W 54+ (a) O 7+ (b) W 55+~61+ (3p-3d) W 60+~63+ (3s-3p) C 5+ JT-60U W 43+~45+ (4s-4p) E Synthesized Calculated by FAC 12 kev, 4x10 19 m -3 The 3s-3p lines of W ~60+ are important lines for diagnostic in the ITER Wavelength high temperature ( nm ) plasmas ( T e ~ 15 kev ) Wavelength (nm) * ) J. Yanagibayashi, T. Nakano et al., submitted to Phys. Rev. Let. ** ) Y. Ralchenko et al J. Phys. B 41 (2008) EBIT(NIST)** 3s-3p lines at 7-8 nm identified in EBIT ** were reproduced by the FAC calculation. 3s-3p at 2.3 nm 3p-3d at 2 nm q (c) 2p n 3s n 3p n 3d n Assumed Fractional Abundance (%)