A tangential CO 2 laser collective scattering system for measuring short-scale turbulent fluctuations in the EAST superconducting tokamak

Cao, Guangming; Li, Y.D.; Li, Q.; Zhang, X.D.; Sun, P. J.; Wu, Guangming; Hu, Liqun

doi:10.1016/j.fusengdes.2014.09.005

Cited by 11 publications

(13 citation statements)

References 17 publications

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“…A CO 2 laser collective scattering system [16] was first employed to provide the simultaneous measurements of core and outer micro-turbulence. It was designed according to the scheme in Ref.…”

Section: Methodsmentioning

confidence: 99%

“…A tangential CO 2 laser collective scattering system [16] was employed to provide the simultaneous measurements of core and outer micro-turbulence. It is found that, the intensity of micro-turbulence decreases most strongly near the outer region of the plasma, with less dramatic reduction deeper into the plasma; during the L-H transition, the cross-coherence between broadband turbulence at neighboring wave-numbers in the same region of the plasma increase from less than 0.3 to greater than 0.8 just after the I-H.…”

Section: Introductionmentioning

confidence: 99%

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The Dynamics of Core and Outer Micro-turbulence During the L–I–H Confinement Transition on the EAST Superconducting Tokamak

Cao

et al. 2015

J Fusion Energ

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The dynamics of the core and outer microturbulence during the low-intermediate-high (L-I-H) confinement transition have been investigated simultaneously by a tangential CO 2 laser collective scattering system on EAST. It is found that, the intensity of micro-turbulence decreases most strongly near the outer region of the plasma, with less dramatic reduction deeper into the plasma. During the transition, the cross-coherence between broadband turbulence at neighboring wave-numbers in the same region of the plasma increase from less than 0.3 to greater than 0.8 just after the I-H transition. Besides, the magnetic fluctuations in the LCO frequency range reaches a maximum just before the final transition to H-mode, indicating the plausible underlying role of the perturbation of the pressure gradient in the triggering of the transition dynamics. These results would help to achieve a more comprehensive understanding of the L-H transition mechanism.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Dynamics of Core and Outer Micro-turbulence During the L–I–H Confinement Transition on the EAST Superconducting Tokamak

Cao

et al. 2015

J Fusion Energ

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“…As an effective and non-perturbing method to determine the spatial and temporal distribution of electron density fluctuation in plasma, the collective Thomson scattering diagnostic has been widely applied on various magnetic confinement fusion devices, such as EAST [5], NSTX [6], DIII-D [7], KSTAR [8], etc.…”

Section: Introductionmentioning

confidence: 99%

Development of the HCN heterodyne collective scattering system on J-TEXT

Tao¹,

Shi²,

Li³

et al. 2022

Plasma Sci. Technol.

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A heterodyne collective scattering system has been designed and developed to investigate turbulent transport of core plasma on J-TEXT. A dual-HCN laser which consists of two separately pumped HCN gas lasers at 337 μm has been developed as the laser source of the scattering system. The intermediate frequency (IF) is ~1 MHz when there is a 4 μm cavity length difference and capable to maintain stability more than 5 h without manual operation. Detection channels at three different angels (2 ≤ k_(⊥) ≤ 12cm^(-1)) have been installed with Schottky barrier diode mixers of 893 GHz. The bandwidth of acquisition system is 6 MHz to observe low-frequency density fluctuations. Initial experimental results have been detected and more results can be expected in the future experiment.

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“…Many diagnostic approaches can measure turbulent fluctuations in confined magnetized plasma. Beam emission spectroscopy (BES) [4], Electron cyclotron emission imaging (ECEI) [5], Phase contrast imaging (PCI) [6], Heavy ion beam probe (HIBP) [7], collective Thomson scattering (CTS) [8,9], and other diagnostics, can measure the turbulent fluctuations in the core plasma. But the short-scale turbulent fluctuations, especially the electron gyro-scale turbulent fluctuations are mainly detected by the electromagnetic waves collective scattering.…”

Section: Introductionmentioning

confidence: 99%

“…But the short-scale turbulent fluctuations, especially the electron gyro-scale turbulent fluctuations are mainly detected by the electromagnetic waves collective scattering. Those CTS diagnostics have been used on several magnetic confinement machines, including Tore Supra [10], W7-AS [11], NSTX [8,12], EAST [9], KSTAR [13] and so on. Recently, a tangential CO 2 laser collective scattering system (CO 2 CTS) has been successfully developed to measure short-scale density fluctuations on HL-2A tokamak (major radius 𝑅 0 = 165 cm, and minor radius 𝑎 = 40 cm [14]).…”

Section: Introductionmentioning

confidence: 99%

A laser collective scattering system for measuring short-scale turbulence on HL-2A tokamak

Yao¹,

Xu²,

Wang³

et al. 2020

J. Inst.

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A two-channel CO2 laser collective scattering system has been successfully developed to measure short-scale density fluctuations in the core region of HL-2A tokamak plasma. Turbulent fluctuations of two different radial wavenumbers in the range of 10 ∼ 50 cm−1 can be measured simultaneously. The probe beam and reference beams pass through the plasma torus tangentially, and cross at the measured region. Experimental measurements show that this system can measure not only short-scale turbulent fluctuations, but also MHD activities. Furthermore, a technique of chopping the probe laser beam is introduced to separate the signals of short-scale and large-scale fluctuations.

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A tangential CO 2 laser collective scattering system for measuring short-scale turbulent fluctuations in the EAST superconducting tokamak

Cited by 11 publications

References 17 publications

The Dynamics of Core and Outer Micro-turbulence During the L–I–H Confinement Transition on the EAST Superconducting Tokamak

The Dynamics of Core and Outer Micro-turbulence During the L–I–H Confinement Transition on the EAST Superconducting Tokamak

Development of the HCN heterodyne collective scattering system on J-TEXT

A laser collective scattering system for measuring short-scale turbulence on HL-2A tokamak

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