Empirical Scaling Laws of Neutral Beam Injection Power in HL-2A Tokamak

Cao, Jianyong; Wei, Hui-Ling; Li, He; Yang, Xianfu; Zou, G. Q.; Yu, Liming; Li, Qing; Luo, Cheng; Pan, Yuwei; Jiang, Shaofeng; Lei, Guangjiu; Li, Bo; Rao, Jun; Duan, X.R.

doi:10.1088/0256-307x/32/5/052902

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…The NBI system [69] consists of two independent beamlines, both beamlines are co-injected into the HL-2A tokamak tangentially with an injection angle of 58.1 • (the angle between the NBI beamline and major radius). The beam power P NBI into the plasma is, P NBI = η injection × P extraction , where P extraction = ∑ i =1:4 V × I, is the total electric power of ion beams, and i denotes the sequence number of the ion source, V and I are the values of beam voltage and current respectively.…”

Section: Methodsmentioning

confidence: 99%

Identification of core ion cyclotron instabilities on HL-2A tokamak

Liu,

Tong,

Zou

et al. 2023

Nucl. Fusion

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Instabilities in multiplies of ion cyclotron frequency range are identified and termed as core ion cyclotron emission (ICE) in recent HL-2A neutral beam injection (NBI) heated experiments. Characteristics of the core ICE are presented, including frequency dependence and harmonics features. The detected frequencies are found to agree well with the multiplies of the deuterium cyclotron frequency around the magnetic axis. Additionally, the core ICE exhibits a predominantly compressional property. Observations of distinct spectrum features and individual excitation of each harmonic have demonstrated that the core ICE harmonics are independent multiple modes. Notably, the variation of plasma current is a necessary condition for exciting the 4th harmonic ICE individually. The results suggest that the drive mechanism of core ICE varies between the different frequency ranges.

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Section: Methodsmentioning

confidence: 99%

Identification of core ion cyclotron instabilities on HL-2A tokamak

Liu,

Tong,

Zou

et al. 2023

Nucl. Fusion

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“…The neutral beam injection (NBI) system consists of two independent beamlines, both beamlines are co-injected into the HL-2A tokamak tangentially with an injection angle of 58.1 • . The maximum port-through power of the two beamlines is about 1.2 MW and 1.0 MW, respectively [29]. The energy of the beam ions (deuterium) can be accelerated up to about 50 keV.…”

Section: Ice Diagnostic Setupmentioning

confidence: 99%

Development of the ion cyclotron emission diagnostic on the HL-2A tokamak

Tong¹,

Fang²,

Yu³

et al. 2022

J. Inst.

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An ion cyclotron emission (ICE) diagnostic, which is based on a B-dot probe, has been recently designed and installed on HL-2A tokamak. The diagnostic is used to study various high-frequency magnetic field fluctuations which can be excited by energetic ions and runaway electrons in the plasma. The ICE diagnostic on HL-2A includes a high-frequency B-dot probe, direct current (DC) block, radio frequency splitters, filter bank and power detectors. The filter bank is composed of 16 channels filters, with the center frequency covering from 10 to 160 MHz, 10 MHz step length and 8 MHz bandwidth. The log detectors with a large dynamic range (from −80 dBm to −20 dBm) are used to detect the bandpass power. Test results of the B-dot probe, filters and power detectors are shown. The signals can also be sampled with a fast analog-to-digital converter with a 14-bit depth, 100 MHz bandwidth and 250 MSample/s sampling rate.

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“…The NBI heating power has been estimated by using an empirical scaling law, which includes some basic parameters, such as the averaged pressure in the discharge chamber of the ion sources, the averaged power loss ratio of the neutralization ducts and the averaged acceleration voltage of ion sources. [37] These parameters are all measured during plasma discharges. The input power of ECRH is measured with the calorimetric method.…”

Section: Experimental Conditionsmentioning

confidence: 99%

Favourable scenarios established by SMBI for the realization of the ELMy H-mode at HL-2A

Cui

Feng

et al. 2017

Chinese Phys. B

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The ELMy H-mode plasmas realized with the supersonic molecular beam injection (SMBI) are studied in relation to the energy confinement and the heating power for the L-H transition (P L−H ) in the HL-2A tokamak. A database is assembled for this study based on the ELMy H-mode discharges during the experimental campaigns in the period 2009-2013 at the HL-2A tokamak. The statistical results show that the SMBI is favourable for reaching the H-mode by reducing the heating power at the L-H transition and for the H-mode performance by improving the energy confinement compared with the ordinary gas puffing (GP). The reduction of P L−H is about 20% when the density is low, and the energy confinement enhancement factor of H H98y2 = τ E /τ th,98y2 ≈ 1.5 is achieved with the SMBI. Note that in the database the density dependence of P L−H is non-monotonic with the ne,min ≈ 3×10 19 m −3 at which the P L−H is minimum. Most of P L−H data are on the low density branch where the P L−H increases with the decrease in density. The minimum of the P L−H in HL-2A is comparable to the ITPA multi-machine threshold power scaling P thr scal08 . The physics behind the reduction of the P L−H with the SMBI is also investigated in relation to the change of the density gradient at the plasma edge, the gas fuelling efficiency, and the recycling.

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Empirical Scaling Laws of Neutral Beam Injection Power in HL-2A Tokamak

Cited by 8 publications

References 2 publications

Identification of core ion cyclotron instabilities on HL-2A tokamak

Identification of core ion cyclotron instabilities on HL-2A tokamak

Development of the ion cyclotron emission diagnostic on the HL-2A tokamak

Favourable scenarios established by SMBI for the realization of the ELMy H-mode at HL-2A

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