Electrode discharge assisted electron cyclotron wave current startup on the CT-6B tokamak

Shaobai, Zheng; Yang, Xiaomin; Jiang, Diming; Xin-zi, Yao; Chi, Feng; Jiang, Deyi; Fang, Tongzhen; Long, Wang

doi:10.1088/0029-5515/40/2/301

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…A novel method of electron cyclotron wave current startup is proposed and demonstrated in the CT-6B tokamak. A discharge between a pair of electrodes is introduced and forms a magnified toroidal current in a strong toroidal field and a weak vertical field, in which the electron cyclotron wave produces a background plasma [22].…”

Section: Ct-6b Experimentsmentioning

confidence: 99%

Overview on the progress of tokamak experimental research in China

et al. 2001

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Tokamak experimental research in China has made important progress. The main efforts were related to quasi-steady-state operation, LHCD, plasma heating with ICRF, IBW, NBI and ECRH, fuelling with pellets and supersonic molecular beams, and first wall conditioning techniques. Plasma parameters in the experiments were much improved, for example ne = 8 × 10 19 m −3 and a plasma pulse length of >10 s were achieved. ICRF boronization and conditioning resulted in Z eff close to unity. Steady state full LH wave current drive has been achieved for more than 3 s. LHCD ramp-up and recharge have also been demonstrated. The best η exp CD ≈ 0.5(1 + 0.085 exp(4.8(BT − 1.45)))neICD Rp/PLH = 10 19 m −2 A W −1 . Quasi-steady-state H-mode-like plasmas with a density close to the Greenwald limit were obtained by LHCD, where the energy confinement time was nearly five times longer than in the ohmic case. The synergy between IBW, pellet and LHCD was tested. Research on the mechanism of macroturbulence has been extensively carried out experimentally. AC tokamak operation has been successfully demonstrated.

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Section: Ct-6b Experimentsmentioning

confidence: 99%

Overview on the progress of tokamak experimental research in China

et al. 2001

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“…The Grad-Shafranov (G-S) equation [1][2][3] has been widely applied to reconstruct magnetic flux in magnetic devices [4][5][6][7][8][9][10][11] which contain a central solenoid (CS) to drive plasma current. The G-S equation is also employed in plasma non-inductive current start-up experiments utilizing RF waves [12][13][14][15][16][17] and helicity injection techniques [14,[18][19][20][21]. However, it is important to note that the G-S equation is based on the assumption of single-fluid equilibrium ( , where p is pressure) [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Experimental confirmation of the linear relation between plasma current and external vertical magnetic field in EXL-50 spherical torus energetic electron plasmas

DONG 董,

WANG 王,

LIU 刘

et al. 2024

Plasma Sci. Technol.

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A three-fluid equilibrium plasma with bulk plasma and energetic electrons has been observed on the Xuanlong-50 (EXL-50) spherical torus, where the energetic electrons play a crucial role in sustaining the plasma current and pressure. In this study, the equilibrium of a multi-fluid plasma was investigated by analyzing the relationship between the external vertical magnetic field (B<sub>V</sub >), plasma current (Ip), the poloidal ratio (βp) and the Shafranov formula. Remarkably, our research demonstrates some validity of the Shafranov formula in the presence of multi-fluid plasma in EXL-50 spherical torus. This finding holds significant importance for future reactors as it allows for differentiation between alpha particles and background plasma. The study of multi-fluid plasma provides a significant reference value for the equilibrium reconstruction of burning plasma involving alpha particles.

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“…Qayyum abdul.qaui@yahoo.com be reduced significantly by adopting various pre-ionization schemes during startup phase [15][16][17]. ECRH-assisted current startup is a scheme for generating toroidal plasma currents in tokomaks [18][19][20]. In this scheme, a RF beam in the electron cyclotron resonance frequency range is launched prior to the application of toroidal electrical field (E / ) or in its presence for generating plasma and inducing plasma current under appropriate conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, E / drives a toroidal ohmic current in the initial plasma. ECRH-assisted startup scheme has been demonstrated on a number of tokamaks, and has improved the startup performance of tokamaks [19,20]. In particular, a substantial reduction in loop voltage for the ohmic current startup is observed and thus a saving of magnetic flux of the transformer (OH solenoid) in the initial phase of startup.…”

Section: Introductionmentioning

confidence: 99%

Triple-probe Diagnostic Measurements in Plasma of GLAST Spherical Tokamak

Qayyum¹,

Ahmad²,

Khan³

et al. 2015

J Fusion Energ

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Triple-probe has been developed and operated successfully to characterize ECRH-assisted argon as well as hydrogen microwave plasmas in GLAST Spherical Tokamak. This technique enables to determine transient plasma parameters such as floating potential, electron temperature and electron number density in rapidly timevarying plasmas. An effective electron heating mechanism is applied to produce microwave plasma by injecting radiofrequency (RF) radiation at a frequency of 2.45 GHz in the presence of resonant toroidal magnetic field. Plasma parameters and corresponding fluctuations are measured as a function of time in different gas fill pressures for various applied magnetic fields. The results demonstrate the dependence of plasma parameters such as V f , T e , n e and their fluctuations on gas fill pressure during the pre-ionization phase of the GLAST operation. Plasma behavior is observed to be closely depending on the coupling of RF power during microwave discharge. Additionally, the hydrogen plasma shows pronounced fluctuations in comparison with argon plasma with some decrease in electron temperature and densities.

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Electrode discharge assisted electron cyclotron wave current startup on the CT-6B tokamak

Cited by 8 publications

References 7 publications

Overview on the progress of tokamak experimental research in China

Overview on the progress of tokamak experimental research in China

Experimental confirmation of the linear relation between plasma current and external vertical magnetic field in EXL-50 spherical torus energetic electron plasmas

Triple-probe Diagnostic Measurements in Plasma of GLAST Spherical Tokamak

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