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Radiative heat exhaust in Alcator C-Mod I-mode plasmas.

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Title: Radiative heat exhaust in Alcator C-Mod I-mode plasmas.
Authors: M.L. Reinke1 reinkeml@ornl.gov, D. Brunner2, T. Golfinopoulos2, A.E. Hubbard2, J.W. Hughes2, A.Q. Kuang2, B. LaBombard2, E. Marmar2, R. Mumgaard2, J.L. Terry2, J. Lore1, J. Canik1, I. Cziegler3, Team, Alcator C-Mod
Source: Nuclear Fusion. Apr2019, Vol. 59 Issue 4, p1-1. 1p.
Subjects: Waste heat, Heat, Heat flux
Abstract: In order to more completely demonstrate the I-mode regime as a compelling fusion reactor operating scenario, the first dedicated attempts at I-mode radiative heat exhaust and detachment were carried out on Alcator C-Mod. Results conclusively show that within the parameter space explored, an I/L back-transition is triggered prior to meaningful reductions in parallel heat flux, , target temperature, and target pressure, at the outer divertor. The exact mechanism for the I/L trigger remains uncertain, but a multi-diagnostic investigation suggests the pedestal regulation physics is impacted promptly by small amounts of N2 seeded into the private flux region. The time delay between when N2 contacts the plasma and the I/L transition is triggered varied from 30–120 ms, approximately 0.7–, and the delay varied inversely with I-mode pedestal-top pressure, p e,95. Power and nitrogen influx scans indicate that the I/L transitions are not linked to excessive bulk-plasma impurity radiation. It is also shown that in the subsequent L-mode following nitrogen seeding, and can be reduced by factors of 10. The I/L transition and L-mode exhaust results using N2 are compared to similar attempts using Ne where such and reductions in L-mode are limited to factors of 2–3. Implications for the I-mode regime are discussed, including needs for follow-up experiments on other facilities. [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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Header DbId: egs
DbLabel: Engineering Source
An: 135369917
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Radiative heat exhaust in Alcator C-Mod I-mode plasmas.
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  Data: <searchLink fieldCode="AR" term="%22M%2EL%2E+Reinke%22">M.L. Reinke</searchLink><relatesTo>1</relatesTo><i> reinkeml@ornl.gov</i><br /><searchLink fieldCode="AR" term="%22D%2E+Brunner%22">D. Brunner</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22T%2E+Golfinopoulos%22">T. Golfinopoulos</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22A%2EE%2E+Hubbard%22">A.E. Hubbard</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22J%2EW%2E+Hughes%22">J.W. Hughes</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22A%2EQ%2E+Kuang%22">A.Q. Kuang</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22B%2E+LaBombard%22">B. LaBombard</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22E%2E+Marmar%22">E. Marmar</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22R%2E+Mumgaard%22">R. Mumgaard</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22J%2EL%2E+Terry%22">J.L. Terry</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22J%2E+Lore%22">J. Lore</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22J%2E+Canik%22">J. Canik</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22I%2E+Cziegler%22">I. Cziegler</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Team%2C+Alcator+C-Mod%22">Team, Alcator C-Mod</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Waste+heat%22">Waste heat</searchLink><br /><searchLink fieldCode="DE" term="%22Heat%22">Heat</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+flux%22">Heat flux</searchLink>
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  Data: In order to more completely demonstrate the I-mode regime as a compelling fusion reactor operating scenario, the first dedicated attempts at I-mode radiative heat exhaust and detachment were carried out on Alcator C-Mod. Results conclusively show that within the parameter space explored, an I/L back-transition is triggered prior to meaningful reductions in parallel heat flux, , target temperature, and target pressure, at the outer divertor. The exact mechanism for the I/L trigger remains uncertain, but a multi-diagnostic investigation suggests the pedestal regulation physics is impacted promptly by small amounts of N2 seeded into the private flux region. The time delay between when N2 contacts the plasma and the I/L transition is triggered varied from 30–120 ms, approximately 0.7–, and the delay varied inversely with I-mode pedestal-top pressure, p e,95. Power and nitrogen influx scans indicate that the I/L transitions are not linked to excessive bulk-plasma impurity radiation. It is also shown that in the subsequent L-mode following nitrogen seeding, and can be reduced by factors of 10. The I/L transition and L-mode exhaust results using N2 are compared to similar attempts using Ne where such and reductions in L-mode are limited to factors of 2–3. Implications for the I-mode regime are discussed, including needs for follow-up experiments on other facilities. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  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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        Value: 10.1088/1741-4326/ab04cf
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      – SubjectFull: Waste heat
        Type: general
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      – SubjectFull: Heat flux
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