Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions
Electron impact excitation (EIE) and dielectronic recombination (DR) of tungsten ions are basic atomic processes in nuclear fusion plasmas of the International Thermonuclear Experimental Reactor (ITER) tokamak. Detailed investigation of such processes is essential for modeling and diagnosing future...
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MDPI AG
2015-11-01
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| author | Zhongwen Wu Yanbiao Fu Xiaoyun Ma Maijuan Li Luyou Xie Jun Jiang Chenzhong Dong |
| author_facet | Zhongwen Wu Yanbiao Fu Xiaoyun Ma Maijuan Li Luyou Xie Jun Jiang Chenzhong Dong |
| author_sort | Zhongwen Wu |
| collection | DOAJ |
| description | Electron impact excitation (EIE) and dielectronic recombination (DR) of tungsten ions are basic atomic processes in nuclear fusion plasmas of the International Thermonuclear Experimental Reactor (ITER) tokamak. Detailed investigation of such processes is essential for modeling and diagnosing future fusion experiments performed on the ITER. In the present work, we studied total and partial electron-impact excitation (EIE) and DR cross-sections of highly charged tungsten ions by using the multiconfiguration Dirac–Fock method. The degrees of linear polarization of the subsequent X-ray emissions from unequally-populated magnetic sub-levels of these ions were estimated. It is found that the degrees of linear polarization of the same transition lines, but populated respectively by the EIE and DR processes, are very different, which makes diagnosis of the formation mechanism of X-ray emissions possible. In addition, with the help of the flexible atomic code on the basis of the relativistic configuration interaction method, DR rate coefficients of highly charged W37+ to W46+ ions are also studied, because of the importance in the ionization equilibrium of tungsten plasmas under running conditions of the ITER. |
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| language | English |
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| spelling | doaj.art-093c93b2480a452b9c988d8a20a455042022-12-21T23:46:02ZengMDPI AGAtoms2218-20042015-11-013447449410.3390/atoms3040474atoms3040474Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten IonsZhongwen Wu0Yanbiao Fu1Xiaoyun Ma2Maijuan Li3Luyou Xie4Jun Jiang5Chenzhong Dong6Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, ChinaKey Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, ChinaKey Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, ChinaKey Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, ChinaKey Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, ChinaKey Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, ChinaKey Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, ChinaElectron impact excitation (EIE) and dielectronic recombination (DR) of tungsten ions are basic atomic processes in nuclear fusion plasmas of the International Thermonuclear Experimental Reactor (ITER) tokamak. Detailed investigation of such processes is essential for modeling and diagnosing future fusion experiments performed on the ITER. In the present work, we studied total and partial electron-impact excitation (EIE) and DR cross-sections of highly charged tungsten ions by using the multiconfiguration Dirac–Fock method. The degrees of linear polarization of the subsequent X-ray emissions from unequally-populated magnetic sub-levels of these ions were estimated. It is found that the degrees of linear polarization of the same transition lines, but populated respectively by the EIE and DR processes, are very different, which makes diagnosis of the formation mechanism of X-ray emissions possible. In addition, with the help of the flexible atomic code on the basis of the relativistic configuration interaction method, DR rate coefficients of highly charged W37+ to W46+ ions are also studied, because of the importance in the ionization equilibrium of tungsten plasmas under running conditions of the ITER.http://www.mdpi.com/2218-2004/3/4/474electron impact excitationdielectronic recombinationhighly charged tungsten ionsDR rate coefficientsdegree of linear polarization |
| spellingShingle | Zhongwen Wu Yanbiao Fu Xiaoyun Ma Maijuan Li Luyou Xie Jun Jiang Chenzhong Dong Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions Atoms electron impact excitation dielectronic recombination highly charged tungsten ions DR rate coefficients degree of linear polarization |
| title | Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions |
| title_full | Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions |
| title_fullStr | Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions |
| title_full_unstemmed | Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions |
| title_short | Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions |
| title_sort | electron impact excitation and dielectronic recombination of highly charged tungsten ions |
| topic | electron impact excitation dielectronic recombination highly charged tungsten ions DR rate coefficients degree of linear polarization |
| url | http://www.mdpi.com/2218-2004/3/4/474 |
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