Prevention of resistive wall tearing mode major disruptions with feedback

Strauss, H. R.

doi:10.1063/5.0250999

Prevention of resistive wall tearing mode major disruptions with feedback

Journal Article · Fri Mar 07 00:00:00 EST 2025 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0250999· OSTI ID:2528649

^[1]

HRS Fusion, West Orange, NJ (United States); HRS Fusion

Resistive wall tearing modes (RWTMs) can cause major disruptions. A signature of RWTMs is that the rational surface is sufficiently close to the wall to interact with it. For (m,n) = (2,1) modes, a RWTM requires normalized minor radius of the rational surface ρ_q2 ≥ 0.75, which can also be expressed as q₇₅ ≤ 2. Major disruptions can occur when the criterion is satisfied. This is confirmed in simulations and theory and in a DIII-D locked mode disruption database. The q₇₅ < 2 criterion is valid at high β as well as at low β. A very important feature of RWTMs is that they can be feedback stabilized. If the ρ_q2 criterion is not satisfied, or if the wall is ideally conducting, then the mode does not produce a major disruption, although it can produce a minor disruption. Feedback, or rotation of the mode at the wall by complex feedback, can emulate an ideal wall, preventing major disruptions. The ρ_q2 criterion depends weakly on the wall radius. A simple geometric model of its dependence on wall radius is given.

View Accepted Manuscript (DOE)

Research Organization:: HRS Fusion, West Orange, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0020127

OSTI ID:: 2528649

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 32; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Prevention of resistive wall tearing mode major disruptions with feedback

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