RETRACTED ARTICLE: Fast Electrons Behavior in Presence of External Radial Electric Field in IR-T1 Tokamak

Elahi, A. Salar; Ghoranneviss, M.

doi:10.1007/s10894-013-9661-6

Cited by 7 publications

(1 citation statement)

References 87 publications

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“…Preventing their generation and safely dispersing energy during a disruption is crucial [35]. Based on these explanations, addressing and also mitigating or eliminating these disruptions in tokamak plasma control is vital.…”

Section: Resultsmentioning

confidence: 99%

Integrated plasma control system for IR-T1 tokamak with disruption mitigation

2023

ijpr

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Controlling tokamak plasmas is a complex process that is affected by structured uncertainties and unmodeled dynamics. To overcome these challenges and achieve a well-defined robust behavioral outcome, it is crucial to develop standard controllers. The decoupling control theory for Multiple-Input Multiple-Output (MIMO) processes is a powerful technique that allows the mitigation or elimination of undesirable cross-coupling terms in tokamaks, making it superior to the Single-Input Single-Output (SISO) control scheme. Our study proposes two types of controllers, PID-tuned and cascadedrobust controllers, that exploit decoupling and robustness for horizontal position and current control of plasma in IR-T1 tokamak. We compare the controllers through simulations and study the impact of changing the vertical field coil voltage on the cross-coupling of these two plasma parameters. The results demonstrate that the PID-tuned controller outperforms the robust controller in terms of meeting control requirements, disturbance rejection, reference value tracking, and disruption mitigation, especially in cross-coupling controls. Of course, the definitive confirmation requires experimental studies with more diverse conditions and, finally construction and operation of these controllers in tokamaks.

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Section: Resultsmentioning

confidence: 99%

Integrated plasma control system for IR-T1 tokamak with disruption mitigation

2023

ijpr

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RETRACTED ARTICLE: Review on Plasma Edge Analysis Using the Auto-Correlation and Probability Distributions of Fluctuations

2015

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We have reviewed the plasma edge fluctuations analysis over a wide range of plasma and field parameters in the IR-T1 tokamak. Fluctuation levels and spectra were measured using two arrays of Langmuir probes on the edge region. Under almost all conditions the edge plasma was turbulently unstable, with a broadband fluctuation spectrum in the drift wave range of frequencies f = 10-1000 kHz. A stable state was observed only in the very cold, low-current discharge formed at unusually high neutral filling pressure. Otherwise, the relative fluctuation level as monitored by the ion saturation current was very high while the fluctuation power spectra were roughly invariant in shape. The relative fluctuation level was always highest near the wall and decreased monotonically toward the plasma centre.

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