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Modulation of prompt fast-ion loss by applied n = 2 fields in the DIII-D tokamak.

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Title: Modulation of prompt fast-ion loss by applied n = 2 fields in the DIII-D tokamak.
Authors: Zeeland, M A Van1, Ferraro, N M1, Heidbrink, W W2, Kramer, G J3, Pace, D C1, Chen, X2, Evans, T E1, Fisher, R K1, García-Muñoz, M4, Hanson, J M5, Lanctot, M J1, Lao, L L1, Moyer, R A6, Nazikian, R3, Orlov, D M6
Source: Plasma Physics & Controlled Fusion. Jan2014, Vol. 56 Issue 1, p015009-015018. 10p.
Subjects: Electronic modulation, Tokamaks testing, Neutral beams, Synchrotron radiation, Electromagnetic measurements, Spheromaks
Abstract: Energy and pitch angle resolved measurements of escaping neutral beam ions (E ≈ 80 keV) have been made during DIII-D L-mode discharges with applied, slowly rotating, n = 2 magnetic perturbations. Data from separate scintillator detectors (FILDs) near and well below the plasma midplane show fast-ion losses correlated with the internal coil (I-coil) fields. The dominant fast-ion loss signals are observed to decay within one poloidal transit time after beam turn-off indicating they are primarily prompt loss orbits. Also, during application of the rotating I-coil fields, outboard midplane edge density and bremsstrahlung emission profiles exhibit a radial displacement of up to δR ≈ 1 cm. Beam deposition and full orbit modeling of these losses using M3D-C1 calculations of the perturbed kinetic profiles and fields reproduce many features of the measured losses. In particular, the predicted phase of the modulated loss signal with respect to the I-coil currents is in close agreement with FILD measurements as is the relative amplitudes of the modulated losses for the co and counter-current beam used in the experiment. These simulations show modifications to the beam ion birth profile and subsequent prompt loss due to changes in the edge density; however, the dominant factor causing modulation of the losses to the fast-ion loss detectors is the perturbed magnetic field (δB/B ≈ 10−3 in the plasma). Calculations indicate total prompt loss to the DIII-D wall can increase with application of the n = 2 perturbation by up to 7% for co-current injected beams and 3% for counter-current injected beams depending on phase of the perturbation relative to the injected beam. [ABSTRACT FROM AUTHOR]
Copyright of Plasma Physics & Controlled 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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  Data: Modulation of prompt fast-ion loss by applied n = 2 fields in the DIII-D tokamak.
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  Data: <searchLink fieldCode="AR" term="%22Zeeland%2C+M+A+Van%22">Zeeland, M A Van</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ferraro%2C+N+M%22">Ferraro, N M</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Heidbrink%2C+W+W%22">Heidbrink, W W</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kramer%2C+G+J%22">Kramer, G J</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Pace%2C+D+C%22">Pace, D C</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+X%22">Chen, X</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Evans%2C+T+E%22">Evans, T E</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Fisher%2C+R+K%22">Fisher, R K</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22García-Muñoz%2C+M%22">García-Muñoz, M</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Hanson%2C+J+M%22">Hanson, J M</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Lanctot%2C+M+J%22">Lanctot, M J</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lao%2C+L+L%22">Lao, L L</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Moyer%2C+R+A%22">Moyer, R A</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Nazikian%2C+R%22">Nazikian, R</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Orlov%2C+D+M%22">Orlov, D M</searchLink><relatesTo>6</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Plasma+Physics+%26+Controlled+Fusion%22">Plasma Physics & Controlled Fusion</searchLink>. Jan2014, Vol. 56 Issue 1, p015009-015018. 10p.
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  Data: Energy and pitch angle resolved measurements of escaping neutral beam ions (E ≈ 80 keV) have been made during DIII-D L-mode discharges with applied, slowly rotating, n = 2 magnetic perturbations. Data from separate scintillator detectors (FILDs) near and well below the plasma midplane show fast-ion losses correlated with the internal coil (I-coil) fields. The dominant fast-ion loss signals are observed to decay within one poloidal transit time after beam turn-off indicating they are primarily prompt loss orbits. Also, during application of the rotating I-coil fields, outboard midplane edge density and bremsstrahlung emission profiles exhibit a radial displacement of up to δR ≈ 1 cm. Beam deposition and full orbit modeling of these losses using M3D-C1 calculations of the perturbed kinetic profiles and fields reproduce many features of the measured losses. In particular, the predicted phase of the modulated loss signal with respect to the I-coil currents is in close agreement with FILD measurements as is the relative amplitudes of the modulated losses for the co and counter-current beam used in the experiment. These simulations show modifications to the beam ion birth profile and subsequent prompt loss due to changes in the edge density; however, the dominant factor causing modulation of the losses to the fast-ion loss detectors is the perturbed magnetic field (δB/B ≈ 10−3 in the plasma). Calculations indicate total prompt loss to the DIII-D wall can increase with application of the n = 2 perturbation by up to 7% for co-current injected beams and 3% for counter-current injected beams depending on phase of the perturbation relative to the injected beam. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Plasma Physics & Controlled 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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        Value: 10.1088/0741-3335/56/1/015009
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        Text: English
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      – SubjectFull: Electronic modulation
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      – SubjectFull: Tokamaks testing
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      – SubjectFull: Neutral beams
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