Fabrication and installation of KSTAR in-vessel control coils

Kim, H.K.; Lee, K.S.; Yang, H. L.; Last, J.; Bertolini, E.; Kim, K.M.; Bang, Eunnam; Kim, H.T.; Jeon, Y.M.; Kwon, M.

doi:10.1016/j.fusengdes.2011.01.078

Cited by 4 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The KSTAR experimental investigations in the controlled NAMP environment are focused on studying the multi-spectral effects on the ELM crash suppression characteristics and on understanding the balances between the hypothesized suppression-enhancing and hindering mechanisms. The multi-spectral NA field environment in KSTAR is effectively controlled by utilizing the unique KSTAR IVCC configuration [36] and the low intrinsic error field [37]. As a consequence, type-I ELM crash suppression attempts in KSTAR have reproduced both seemingly expected and unexpected suppression performances from the earlier findings in DIII-D [26,38].…”

Section: Discussionmentioning

confidence: 86%

“…The KSTAR IVCCs [36], all located inside the vacuum vessel with its unique top-middle-bottom configuration shown in figure 1, bring the best platform to intentionally create various multi-spectral NA field environments with both pitch-resonant and non-resonant MPs. This IVCC system has three poloidal and four toroidal saddle loop connections, with the IVCCs having two turns each.…”

Section: Methodsmentioning

confidence: 99%

“…To this end, we and the KSTAR team have been investigating ELM crash suppression characteristics in diverse NAMP environments for several years. In particular, we take advantage of the unique KSTAR in-vessel control coil (IVCC) [36] configuration with all the coils (including the middle one) installed inside the vacuum vessel in close proximity to the plasma surface and the reported low intrinsic error fields at O 10 Interestingly, the ELM-suppressed discharges investigated in this work exhibit both expected and unexpected suppression characteristics from the findings in DIII-D [26,38] depending on the auxiliary heating level (i.e. the NBI heating power).…”

Section: Suppression Of Edge Localized Mode Crashes By Multi-spectral...mentioning

confidence: 99%

See 2 more Smart Citations

Suppression of edge localized mode crashes by multi-spectral non-axisymmetric fields in KSTAR

et al. 2016

View full text Add to dashboard Cite

Among various edge localized mode (ELM) crash control methods, only non-axisymmetric magnetic perturbations (NAMPs) yield complete suppression of ELM crashes beyond their mitigation, and thus attract more attention than others. No other devices except KSTAR, DIII-D, and recently EAST have successfully achieved complete suppression with NAMPs. The underlying physics mechanisms of these successful ELM crash suppressions in a non-axisymmetric field environment, however, still remain uncertain. In this work, we investigate the ELM crash suppression characteristics of the KSTAR ELMy H-mode discharges in a controlled multi-spectral field environment, created by both n = 2 middle reference and n = 1 top/bottom proxy in-vessel control coils. Interestingly, the attempts have produced a set of contradictory findings, one expected (ELM crash suppression enhancement with the addition of n = 1 to the n = 2 field at relatively low heating discharges) and another unexpected (ELM crash suppression degradation at relatively high heating discharges) from the earlier findings in DIII-D. This contradiction indicates the dependence of the ELM crash suppression characteristics on the heating level and the associated kink-like plasma responses. Preliminary linear resistive MHD plasma response simulation shows the unexpected suppression performance degradation to be likely caused by the dominance of kink-like plasma responses over the island gap-filling effects.

show abstract

Section: Discussionmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Suppression Of Edge Localized Mode Crashes By Multi-spectral...mentioning

confidence: 99%

See 1 more Smart Citation

Suppression of edge localized mode crashes by multi-spectral non-axisymmetric fields in KSTAR

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The segmented IVCC system was fabricated and successfully installed for vertical position control experiments in 2010 [5]. It is composed of 16 segmented coils and each coil has four segmented current leads.…”

Section: A In-vessel Componentsmentioning

confidence: 99%

Key Features in the Operation of KSTAR

Kwak

Kim

et al. 2012

IEEE Trans. Plasma Sci.

Self Cite

View full text Add to dashboard Cite

The Korea Superconducting Tokamak Advanced Research (KSTAR) device is aimed at advanced tokamak (AT) research. Three years have passed since it achieved its first plasma in 2008. Because it is a superconducting machine and is working toward AT research, it has unique features in terms of the machine engineering and operation. The toroidal field (TF) magnet coils are made of Nb 3 Sn, which provide high TFs up to 3.5 T, and have been fully tested. The poloidal field (PF) magnet coils, consisting of both Nb 3 Sn and NbTi, which have a maximum current of 25 kA in their design, were tested up to 15 kA. A thermal hydraulic analysis is being conducted for PF magnet coil operation. All plasma-facing components (PFCs) are equipped with water cooled graphite tiles and have the capability of being baked up to 350 • C. A startup scenario, which considered both the effect of the ferromagnetic material in the cable in conduit conductor jacket of the magnet coils as well as a nonferromagnetic up-down asymmetry in the cryostat structure, was developed and demonstrated its effectiveness by the last two year's reliable operations. Passive stabilizers and in-vessel control coils (IVCCs) are key components to realize AT operation in KSTAR. The segmented IVCC coils were connected to form circular coils for internal vertical control in 2010, and diverted plasmas with high elongation (κ ∼ 1.8, δ > 0.6) were achieved. A neutral beam injection (NBI) system was developed aiming at 2 MW, 300 s per ion source which meets the long-pulse requirement of KSTAR. An NBI ion source with a power of 1.7 MW at 100 kV has been commissioned for 10 s. Finally, ELMy H-modes were successfully produced with 1.3-MW NBI power at a plasma current of 0.6 MA in the 2010 campaign. The first H-mode discharge (#4200) in KSTAR was achieved one year earlier than officially planned and was done at B T = 2 T with I p = 0.6 MA in a well-balanced double null configuration after boronization on the PFC. Successful operations in the early days of KSTAR including H-mode experiments revealed the capability of advanced and steady-state operation which is essential for the international thermonuclear experimental reactor (ITER) and future fusion reactors.Index Terms-Incoloy, in-vessel control coils (IVCC), Korea superconducting tokamak advanced research (KSTAR), superconducting.

show abstract

A method for automated modeling of plasma shape control response in tokamaks

Walker

2022

Fusion Engineering and Design

View full text Add to dashboard Cite

Fabrication and installation of KSTAR in-vessel control coils

Cited by 4 publications

References 6 publications

Suppression of edge localized mode crashes by multi-spectral non-axisymmetric fields in KSTAR

Suppression of edge localized mode crashes by multi-spectral non-axisymmetric fields in KSTAR

Key Features in the Operation of KSTAR

A method for automated modeling of plasma shape control response in tokamaks

Contact Info

Product

Resources

About