Core-Pedestal Plasma Configurations in Advanced Tokamaks

Hassan, Ehab; Kessel, Charles E.; Park, Jin Myung; Elwasif, Wael R.; Whitfield, Ross E.; Kim, Kyungjin; Snyder, Phil B.; Batchelor, Donald B.; Bernholdt, David E.; Cianciosa, Mark R.; Green, David L.; Law, Kody H.

doi:10.1080/15361055.2022.2145826

Title: Core-Pedestal Plasma Configurations in Advanced Tokamaks

Journal Article · Mon Jan 30 00:00:00 EST 2023 · Fusion Science and Technology

DOI:https://doi.org/10.1080/15361055.2022.2145826· OSTI ID:1923216

^[1]; Kessel, Charles E. ^[2];

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^[2]; Kim, Kyungjin ^[2]; Snyder, Phil B. ^[2]; Batchelor, Donald B. ^[2];

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^[3];

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Ain Shams University (Egypt)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Commonwealth Scientific and Industrial Research Organization (CSIRO) (Australia)
Univ. of Manchester (United Kingdom)

Here, several configurations for the core and pedestal plasma are examined for a predefined tokamak design by implementing multiple heating/current drive (H/CD) sources to achieve an optimum configuration of high fusion power in a noninductive operation while maintaining an ideally magnetohydrodynamic (MHD) stable core plasma using the IPS-FASTRAN framework. IPS-FASTRAN is a component-based lightweight coupled simulation framework that is used to simulate magnetically confined plasma by integrating a set of high-fidelity codes to construct the plasma equilibrium (EFIT, TOQ, and CHEASE), calculate the turbulent heat and particle transport fluxes (TGLF), model various H/CD systems (TORIC, TORAY, GENRAY, and NUBEAM), model the pedestal pressure and width (EPED), and estimate the ideal MHD stability (DCON). The TGLF core transport model and EPED pedestal model are used to self-consistently predict plasma profiles consistent with ideal MHD stability and H/CD (and bootstrap) current sources. In order to evaluate the achievable and sustainable plasma beta, varying configurations are produced ranging from the no-wall stability to with-wall stability regimes, simultaneously subject to the self-consistent TGLF, EPED, and H/CD source profile predictions that optimize configuration performance. The pedestal density, plasma current, and total injected power are scanned to explore their impact on the target plasma configuration, fusion power, and confinement quality. A set of fully noninductive scenarios are achieved by employing ion-cyclotron, neutral beam injection, helicon, and lower-hybrid H/CDs to provide a broad profile for the total current drive in the core region for a predefined tokamak design. These noninductive scenarios are characterized by high fusion gain (Q ~ 4) and power (P_fus ~ 600 MW), optimum confinement quality (H₉₈ ~ 1.1), and high bootstrap current fraction (f_BS ~ 0.7) for Greenwald fraction below unity. The broad current profile configurations identified are stable to low-n kink modes either because the normalized pressure β_N is below the no-wall limit or a wall is present.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1923216

Journal Information:: Fusion Science and Technology, Vol. 79, Issue 3; ISSN 1536-1055

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
core pedestal
integrated modeling
IPS-FASTRAN
plasma confinement
scenario development

Title: Core-Pedestal Plasma Configurations in Advanced Tokamaks

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