Plasma current sustainment after iron core saturation in the STOR-M tokamak

Mitarai, O.; Ding, Yong Hua; Hubeny, Michael; Lu, Yanjie; Onchi, Takumi; McColl, D.; Xiao, Chunsheng; Hirose, Akira

doi:10.1016/j.fusengdes.2014.02.017

Cited by 5 publications

(12 citation statements)

References 6 publications

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“…We should point out that after this work, we could demonstrate the iron core saturable operation in the STOR-M tokamak. 27 Upon successful saturable core operation in STOR-M, an iron core ST machine could be conceived.…”

Section: Discussion and Summarymentioning

confidence: 99%

Plasma current start-up by the outer ohmic heating coils in the Saskatchewan TORus Modified (STOR-M) iron core tokamak

Mitarai

Xiao

McColl

et al. 2015

Review of Scientific Instruments

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A plasma current up to 15 kA has been driven with outer ohmic heating (OH) coils in the STOR-M iron core tokamak. Even when the inner OH coil is disconnected, the outer OH coils alone can induce the plasma current as primary windings and initial breakdown are even easier in this coil layout. This result suggests a possibility to use an iron core in a spherical tokamak to start up the plasma current without a central solenoid. The effect of the iron core saturation on the extension of the discharge pulse length has been estimated for further experiments in the STOR-M tokamak.

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Section: Discussion and Summarymentioning

confidence: 99%

Plasma current start-up by the outer ohmic heating coils in the Saskatchewan TORus Modified (STOR-M) iron core tokamak

Mitarai

Xiao

McColl

et al. 2015

Review of Scientific Instruments

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“…The feedback vertical magnetic field (BV) coil for plasma position control is also shown in figure 1. The turn number N = 4 of the outer OH coil was chosen in this and the previous experiments [1]. In this experiment, additional upper and lower one-turn coils are installed on the outside of the outer OH coils and comparative experiments with a total turn number N = 6 have been carried out.…”

Section: Experimental Layoutmentioning

confidence: 99%

“…Plasma current start-up by the outer OH coil with a turn number of N = 4 has been demonstrated previously. When the iron core approached saturation, an additional third bank was applied to maintain the plasma current [1]. Possible application of this technology to an ST reactor is also briefly described in [1].…”

Section: Introductionmentioning

confidence: 99%

“…When the iron core approached saturation, an additional third bank was applied to maintain the plasma current [1]. Possible application of this technology to an ST reactor is also briefly described in [1]. Although the aspect ratio becomes slightly larger by insertion of the iron core transformer, the reliability and stability of the initial plasma current production may compensate for the disadvantage to develop an ST reactor.…”

Section: Introductionmentioning

confidence: 99%

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Plasma current start-up experiments without a central solenoid in the iron core STOR-M tokamak

et al. 2015

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Reproducible plasma current start-up without a central solenoid (CS) has been demonstrated using the outer ohmic heating (OH) coils in the iron core STOR-M tokamak (Mitarai et al 2014 Fusion Eng. Des. 89 2467. Although the outer OH coil current saturates the iron core eventually, it has been demonstrated that the plasma current can be maintained during the iron core saturation phase. In this work, further studies have been conducted to investigate the effects of the turn number of the outer OH coils (N = 4 or N = 6) in the CS-less discharges and to evaluate the plasma stability with respect to the n-decay index of the vertical magnetic field. For the loose coupling of the iron core with N = 4 turns, the plasma current can be sustained after the additional third capacitor bank is applied near the iron core saturation phase, showing the slow transition from the unsaturated to the partially saturated phase. For the case of stronger coupling of N = 6 turns, the plasma current is increased at the same fast bank voltage, but the main discharge is shortened from 35 to 20 ms. As the magnetizing current is smaller due to stronger coupling between the OH coils and the plasma current, the transition from the unsaturated to the saturated phase is slightly difficult at present. The present experimental results suggest a feasible operation scenario in a future spherical tokamak (ST) at least using loose iron core coupling for smoother transition from the unsaturated to the saturated iron core phase. Thus, a reliable plasma current start-up by the outer OH coils and the current ramp-up to a steady state by additional heating power and vertical field coils could be considered as an operation scenario for future ST reactors with an iron core transformer.

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Equilibrium reconstruction in an iron core tokamak using a deterministic magnetisation model

Appel

Lupelli

Contributors

2018

Computer Physics Communications

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Plasma current sustainment after iron core saturation in the STOR-M tokamak

Cited by 5 publications

References 6 publications

Plasma current start-up by the outer ohmic heating coils in the Saskatchewan TORus Modified (STOR-M) iron core tokamak

Plasma current start-up by the outer ohmic heating coils in the Saskatchewan TORus Modified (STOR-M) iron core tokamak

Plasma current start-up experiments without a central solenoid in the iron core STOR-M tokamak

Equilibrium reconstruction in an iron core tokamak using a deterministic magnetisation model

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