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Kinetic theory and atomic physics corrections for determination of ion velocities from charge-exchange spectroscopy.

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Title: Kinetic theory and atomic physics corrections for determination of ion velocities from charge-exchange spectroscopy.
Authors: Burgos, J. M. Muñoz1 munozj@fusion.gat.com, Burrell, K. H.2, Solomon, W. M.3, Grierson, B. A.3, Loch, S. D.4, Ballance, C. P.4, Chrystal, C.5
Source: Nuclear Fusion. 2013, Vol. 53 Issue 9, p1-24. 24p.
Subjects: Nuclear reactors, Atomic physics, Ion migration & velocity, Charge exchange, Ion temperature, Tokamaks
Abstract: Charge-exchange spectroscopy is a powerful diagnostic tool for determining ion temperatures, densities and rotational velocities in tokamak plasmas. This technique depends on detailed understanding of the atomic physics processes that affect the measured apparent velocities with respect to the true ion rotational velocities. These atomic effects are mainly due to energy dependence of the charge-exchange cross-sections, and in the case of poloidal velocities, due to gyro-motion of the ion during the finite lifetime of the excited states. Accurate lifetimes are necessary for correct interpretation of measured poloidal velocities, specially for high density plasma regimes on machines such as ITER, where l-mixing effects must be taken into account. In this work, a full nl-resolved atomic collisional radiative model coupled with a full kinetic calculation that includes the effects of electric and magnetic fields on the ion gyro-motion is presented for the first time. The model directly calculates from atomic physics first principles the excited state lifetimes that are necessary to evaluate the gyro-orbit effects. It is shown that even for low density plasmas where l-mixing effects are unimportant and coronal conditions can be assumed, the nl-resolved model is necessary for an accurate description of the gyro-motion effects to determine poloidal velocities. This solution shows good agreement when compared to three QH-mode shots on DIII-D, which contain a wide range of toroidal velocities and high ion temperatures where greater atomic corrections are needed. The velocities obtained from the model are compared to experimental velocities determined from co- and counter-injection of neutral beams on DIII-D. [ABSTRACT FROM AUTHOR]
Copyright of Nuclear Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 90084216
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Kinetic theory and atomic physics corrections for determination of ion velocities from charge-exchange spectroscopy.
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  Data: <searchLink fieldCode="AR" term="%22Burgos%2C+J%2E+M%2E+Muñoz%22">Burgos, J. M. Muñoz</searchLink><relatesTo>1</relatesTo><i> munozj@fusion.gat.com</i><br /><searchLink fieldCode="AR" term="%22Burrell%2C+K%2E+H%2E%22">Burrell, K. H.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Solomon%2C+W%2E+M%2E%22">Solomon, W. M.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Grierson%2C+B%2E+A%2E%22">Grierson, B. A.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Loch%2C+S%2E+D%2E%22">Loch, S. D.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Ballance%2C+C%2E+P%2E%22">Ballance, C. P.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Chrystal%2C+C%2E%22">Chrystal, C.</searchLink><relatesTo>5</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Fusion%22">Nuclear Fusion</searchLink>. 2013, Vol. 53 Issue 9, p1-24. 24p.
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  Data: <searchLink fieldCode="DE" term="%22Nuclear+reactors%22">Nuclear reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+physics%22">Atomic physics</searchLink><br /><searchLink fieldCode="DE" term="%22Ion+migration+%26+velocity%22">Ion migration & velocity</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+exchange%22">Charge exchange</searchLink><br /><searchLink fieldCode="DE" term="%22Ion+temperature%22">Ion temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink>
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  Data: Charge-exchange spectroscopy is a powerful diagnostic tool for determining ion temperatures, densities and rotational velocities in tokamak plasmas. This technique depends on detailed understanding of the atomic physics processes that affect the measured apparent velocities with respect to the true ion rotational velocities. These atomic effects are mainly due to energy dependence of the charge-exchange cross-sections, and in the case of poloidal velocities, due to gyro-motion of the ion during the finite lifetime of the excited states. Accurate lifetimes are necessary for correct interpretation of measured poloidal velocities, specially for high density plasma regimes on machines such as ITER, where l-mixing effects must be taken into account. In this work, a full nl-resolved atomic collisional radiative model coupled with a full kinetic calculation that includes the effects of electric and magnetic fields on the ion gyro-motion is presented for the first time. The model directly calculates from atomic physics first principles the excited state lifetimes that are necessary to evaluate the gyro-orbit effects. It is shown that even for low density plasmas where l-mixing effects are unimportant and coronal conditions can be assumed, the nl-resolved model is necessary for an accurate description of the gyro-motion effects to determine poloidal velocities. This solution shows good agreement when compared to three QH-mode shots on DIII-D, which contain a wide range of toroidal velocities and high ion temperatures where greater atomic corrections are needed. The velocities obtained from the model are compared to experimental velocities determined from co- and counter-injection of neutral beams on DIII-D. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Nuclear Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1088/0029-5515/53/9/093012
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      – Code: eng
        Text: English
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        PageCount: 24
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      – SubjectFull: Nuclear reactors
        Type: general
      – SubjectFull: Atomic physics
        Type: general
      – SubjectFull: Ion migration & velocity
        Type: general
      – SubjectFull: Charge exchange
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      – SubjectFull: Ion temperature
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      – SubjectFull: Tokamaks
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      – TitleFull: Kinetic theory and atomic physics corrections for determination of ion velocities from charge-exchange spectroscopy.
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              Text: 2013
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              Y: 2013
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