Extended scintillator-based fast-ion loss diagnostic in the EAST

Jin, Zuanming; Chang, Jiafeng; Huang, J.; Wu, Cuiyu; Xu, Zhiguo; Chu, Nan; Lin, Shiyao; Hu, Liqun; Isobe, M.; Ogawa, K.

doi:10.1016/j.fusengdes.2017.09.016

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…The results show that orbit loss (induced by orbits [11,12] that intersect with the wall or divertor within the poloidal orbit) rate of co-I p beam injectors linearly increases with the increase of beam energy but weakly depends on line averaged density, whilst fast ion orbit loss rate of counter-I p beam injectors is correlated with beam energy, line averaged density and plasma current. A comparison of the orbit loss rate of co-tangent and counter-tangent beam injector is shown in figure 4, where counter-tangent beam injector has a higher orbit loss rate than co-perp beam injector [6], which is consistent with fast ion loss diagnostic [13]. Table 3 shows scalings of orbit loss rate for four beams injectors through the regression analysis.…”

supporting

confidence: 57%

Evaluation of NBI absorption and fast ion stored energy to improve thermal energy confinement time calculation in EAST

Shen

Qian

2019

Plasma Sci. Technol.

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The absorption of neutral beam power and the fast ion stored energy in EAST plasmas with neutral beam injection (NBI) is analyzed to improve the calculation of thermal energy confinement time. The neutral beam power absorption and fast ion stored energy are systematically calculated using the TRANSP code, through the investigation of global parameters including plasma current, line averaged density and beam energy. Results have shown that scaling laws for the NBI absorption coefficient and fast ion energy rate are obtained through statistical analysis. A comparison of the confinement improvement factor H y 98 2 with these new scaling laws against those assuming fixed coefficients is given.

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supporting

confidence: 57%

Evaluation of NBI absorption and fast ion stored energy to improve thermal energy confinement time calculation in EAST

Shen

Qian

2019

Plasma Sci. Technol.

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“…In previous fast ion loss experiments on EAST, the fastion loss detector (FILD) system observed a stronger loss signal from the case with the counter-clockwise toroidal magnetic field in contrast to the case with the clockwise one [21]. Note that the FILD system on EAST is located at the outer wall above the mid-plane.…”

Section: Influence Of the Toroidal Magnetic Field And The Beam Energy...mentioning

confidence: 88%

Simulations of first-orbit losses of neutral beam injection (NBI) fast ions on EAST

Zhang

et al. 2020

Plasma Sci. Technol.

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Simulations of first-orbit losses of neutral beam injection (NBI) fast ions in the EAST tokamak have been studied in detail by using the orbit-following code GYCAVA and the NBI code TGCO. Beam ion losses with the wall boundary are smaller than those with the last closed flux surface boundary. In contrast to heat loads on the wall without radio frequency wave (RFW) antennas, heat loads on the wall with RFW antennas are distributed more locally near the RFW antennas. The direction of the toroidal magnetic field dramatically affects the final positions of lost fast ions, which is related to the magnetic drift. The numerical results on heat loads of beam ions corresponding to different toroidal magnetic fields are qualitatively consistent with the experimental results. Beam ion losses increase with the beam energy for the co-current NBIs and the counter-perpendicular NBI. We have studied the behavior of fast ions produced by a small section neutral beam (beamlet) by using the numerical tool NBIT. The distributions of the loss fraction of beamlet fast ions peaked near the edge of the beam section for the counter-current NBIs, and they are related to the injection angle. This indicates that the first-orbit losses can be reduced by changing the shape of beam cross section.

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“…As a result of close joint works, as shown in Fig. 3, the FILD has been successfully installed on four devices of LHD [63], KSTAR [64], HL-2A [65] and EAST [66,67]. Based on the common detector system, effects of RMP fields and MHD instabilities on EP behavior are studied in detail in LHD, KSTAR and HL-2A [68][69][70].…”

Section: Fild and Neutron Detector Systemsmentioning

confidence: 99%