Update on Design of the ITER In-Vessel Coils

Daly, Edward; Ioki, K.; Loarte, A.; Martín, A.; Brooks, A.; Heitzenroeder, P.; Kalish, M.; Neumeyer, C.; Titus, P.; Zhai, Yuhu; Wu, Yu; Jin, Huan; Long, Feng; Song, Yuntao; Wang, Z.; Pillsbury, R.D.; Feng, Jun; Bohm, Tim D.; Sawan, M.E.; Preble, J.

doi:10.13182/fst13-a18073

Cited by 34 publications

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“…The in-vessel control coils for ITER were specified upon the basis of vacuum modelling [17,18] which stipulated the necessary fields such that the RMP-induced islands overlapped across a certain width of the minor radius which was found to be correlated with ELM suppression in DIII-D experiments [19]. The present ITER design [20] has a set of 27 in-vessel six-turn coils (above, below and at the midplane) permitting a maximum current carrying capability of 90 kA-turns with a variety of field spectra possible since each coil has its own power supply. Configurations giving n < 3 RMPs were originally deprecated since the field penetrates further as the toroidal mode number decreases, giving rise to concerns about the interaction with intrinsic error fields, inadvertent deleterious effects on the core plasma or even the seeding of locked modes and ensuing disruptions.…”

Section: Introductionmentioning

confidence: 99%

Assessing the merits of resonant magnetic perturbations with different toroidal mode numbers for controlling edge localised modes

et al. 2014

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publicationCitation for published version (APA): Chapman, I. T., Kirk, A., Akers, R. J., Ham, C. J., Harrison, J. R., Hawke, J. N., ... Thorton, A. J. (2014). Assessing the merits of resonant magnetic perturbations with different toroidal mode numbers for controlling edge localised modes. Nuclear Fusion, 54(12), 123003-1/15. [123003]. DOI: 10.1088/0029-5515/54/12/123003 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractAn increase in ELM frequency has been demonstrated in MAST by applying resonant magnetic perturbations (RMPs) with toroidal mode number, n RMP = 2, 3, 4, 6. It has been observed that the mitigated ELM frequency increases with the amplitude of the applied field provided it is above a critical threshold. This threshold value depends on the mode number of the RMP, with higher n RMP having a larger critical value. For the same ELM frequency, the reduction in the peak heat load on the divertor plates is approximately the same for all RMP configurations. The RMPs give rise to perturbations to the plasma shape, with lobe structures occurring due to the tangled magnetic fields near the X-point, and corrugations of the plasma boundary at the midplane. The X-point lobe length increases linearly with the applied field when above a threshold, with RMPs of higher toroidal mode number giving rise to longer lobes for the same applied resonant field. Similarly, the midplane displacements increase with the applied field strength, though the corrugation amplitude is less dependent upon the RMP configuration. For all n RMP , the RMPs ...

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Section: Introductionmentioning

confidence: 99%

Assessing the merits of resonant magnetic perturbations with different toroidal mode numbers for controlling edge localised modes

et al. 2014

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“…The vibration test includes three frequency ranges (10-500 Hz, 10-2,000 Hz, and 10-3,000 Hz), and tests between 10 and 80 gravities peak acceleration. It is noted that the vibration frequency for the IVC coils is expected to be 5 Hz (Daly et al 2012), which is below the frequency range for military equipment testing.…”

Section: Vibration Environmentmentioning

confidence: 97%

“…The IVC coil frequency is expected to be 5 Hz (Daly et al 2012), and the gravities are not known but are expected to be much less than ITER's rare seismic events. An ITER seismic level 2 (SL-2) event gives vacuum vessel radial acceleration of 4.6 m/s 2 (0.47 gravities) at the supports, toroidal acceleration of 1.47 m/s 2 (0.15 gravities) at the bottom of the vessel, and vertical acceleration of 27.8 m/s 2 (2.8 gravities) at the inboard vessel wall (Martinez 2012).…”

Section: Vibration Environmentmentioning

confidence: 99%

“…The IVC vibration frequency is expected to be 5 Hz (Daly et al 2012). Basquin's Law is again used for CuCrZr as the failure rate modifier for acceleration factors as is the FIDES recommended 0.5 g rms : …”

Section: Vibration Environmentmentioning

confidence: 99%

“…This value is the lowest used for the set of the four IVC materials. Daly et al (2012) had a concern that vibration of the IVC coils would be a reliability issue. The IVC coils are expected to have a 5 Hz vibration frequency.…”

Section: Radiation Environmentmentioning

confidence: 99%

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