Electromagnetic design of an ICRH system for IGNITOR

Maggiora, Riccardo; Vecchi, G.; Carter, M.D.; Riccitelli, M.

doi:10.1016/s0920-3796(97)00124-5

Cited by 10 publications

(9 citation statements)

References 7 publications

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“…After the radiation resistance rad R is obtained, we could employ the circuit model to derive the input impedance in Z at the antenna input terminal. Figure 3 gives the upper loop circuit model of the antenna [14], in which the transmission line is considered loss-less and lumped resistance rad…”

Section: The Theoretical Coupling Resistancementioning

confidence: 99%

Experimental analysis of the ICRF waves coupling in EAST

et al. 2017

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The experiments were carried out to study the coupling characteristics of the I-port antenna in the ion cyclotron range of frequencies (ICRF) in EAST. The dependencies of the coupling resistance on various parameters including the antenna position, the central electron density, gas injection and the antenna phasing have been studied. The results obtained show that the experimental data are consistent with theoretical simulations. We find that the antenna loading resistance decreases sharply at the L-H transition due to the change of the plasma density profiles in the scrape-off layer (SOL). The effect of the low hybrid wave (LHW) on the ICRF coupling during the H-mode is observed. The theoretical interpretation of the results is discussed, together with the efficient methods to optimize the coupling efficiency.

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Section: The Theoretical Coupling Resistancementioning

confidence: 99%

Experimental analysis of the ICRF waves coupling in EAST

et al. 2017

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“…The method has therefore the potential of helping in the design phase of the antenna, as is done here and in Ref. [24] for the IGNITOR case. Furthermore, the employed scheme allows a fast computation of the Green's functions of crucial importance in the context of a self-consistent antenna analysis.…”

Section: Discussionmentioning

confidence: 92%

“…The conceptual design of the antenna system in the IGNITOR machine comprises two pairs of poloidally aligned straps, with the reference data summarized in Table 2. The two straps of each of these pairs have one end on a common short at the centre and are fed at the other end by a coaxial cable [23,24]; the phasing of these two feeding cables is reversed so that the current in the two shorts cancels out, and the two poloidal straps are considered as one dipole. The relative phase between the two poloidal dipoles is Φ T , and here we consider the cases Φ T = 0 and Φ T = π, which correspond to even (Φ T = 0) and odd (Φ T = π) excitation and a (toroidal) current spectrum.…”

Section: Results For the Ignitor Machinementioning

confidence: 99%

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FLR mode conversion effects in the coupling analysis of the ICRF strap antenna in the IGNITOR machine

Vecchi¹,

Riccitelli²,

Maggiora³

1999

Nucl. Fusion

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The effect of mode conversion on antenna-plasma coupling in the ICRH range is studied. A collisionless, weakly inhomogeneous plasma in the 'slab' approximation, in which mode conversion is described by the tunnelling equation with first harmonic majority (ω = 2ΩcM ) and fundamental minority (ω = Ωcm) ion cyclotron absorption, is considered. Green's function, connecting the electric field on an ICRH antenna with the current flowing in the same antenna, has been evaluated, essentially in closed form, and has been employed to evaluate the antenna radiation resistance. Numerical results have been obtained, for the parameters of the IGNITOR machine and a deuterium-hydrogen plasma; in the cold plasma limit, in which mode conversion effects are disregarded, our results are in agreement with those of an established code. Mode conversion effects produce a decrease of the radiation resistance for the monopole antenna configuration, and much weaker effects on the dipole configuration. This is related to the behaviour of the real part of the Green's function, which tends to vanish rapidly for toroidal wavenumbers approaching zero as a result of reflection from the mode conversion layer.

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“…The voltage distribution between the T-junction and the strap, and the maximum voltage value is calculated by the measured voltage values. The antenna coupling resistance in the paper is used the effective resistance of strap [18].…”

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confidence: 99%

First experimental results with new ICRF antenna in EAST

et al. 2022

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A new ion cyclotron range of frequency (ICRF) antenna, instead of a B-port antenna, is installed at the N-port to improve the power coupling in the 2021 EAST experimental campaign. In all the experiments, a frequency of 37 MHz is used, corresponding to hydrogen minority heating of deuterium plasma at B0 = 2.5 T. The maximum coupling resistance is up to 10 Ω, which is close to two times the resistance of the original two antennas in EAST. The plasma stored energy is increased by 30 kJ/MW, and significant core ion and electron heating are observed. For long pulse operation, we have achieved 1.5 MW/41 s and 1.1 MW/61 s with the new antenna in the high poloidal beta plasma discharge. ICRF power up to 1.8 MW is routinely coupled to the plasma for pulse lengths up to 21 s.

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Electromagnetic design of an ICRH system for IGNITOR

Cited by 10 publications

References 7 publications

Experimental analysis of the ICRF waves coupling in EAST

Experimental analysis of the ICRF waves coupling in EAST

FLR mode conversion effects in the coupling analysis of the ICRF strap antenna in the IGNITOR machine

First experimental results with new ICRF antenna in EAST

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