Recent Progress of Optical and Spectroscopic Diagnostics for Turbulence on the HL-2A tokamak View Full Text


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Article Info

DATE

2021-04-26

AUTHORS

Y. Yu, M. Xu, X. R. Duan, L. Nie, R. Ke, B. D. Yuan, S. B. Gong, T. Lan, Z. H. Wang, T. Long, Y. F. Wu, J. B. Yuan, T. Wu, Y. H. Chen, H. Liu, Y. X. Zhou, H. J. Wang, W. L. Zhong, Z. B. Shi, J. Q. Li, Y. Liu, G. Z. Hao, W. Chen, Q. Chen, A. P. Sun, M. Y. Ye

ABSTRACT

In the last several years, great progress of optical and spectroscopic diagnostics has been achieved on the HL-2A tokamak. The main physical goal of these diagnostics is to measure plasma parameters for research of turbulence and transport. These diagnostics include: (1) a Phase Contrast Imaging to calculate wavenumber spectra based on a 10.6-μm CO2 laser, (2) a multi-channel (48 channels now and 324 channels for future) Beam Emission Spectroscopy (BES) based on neutral beam injection to measure Doppler-shifted 659.1-nm Dα line for density fluctuation measurement, (3) a four-channel Lyman-Alpha-Based BES (LAB) to measure 121-nm vacuum ultraviolet line for edge density fluctuation measurement, (4) a Gas Puff Imaging (GPI) to measure the intensity of 587.6-nm He I line to investigate plasma evolution, (5) a Multi-Color GPI (MC-GPI) to specify electron temperature and plasma density based on the line-intensity-ratio technique, (6) a Doppler Coherent Imaging Spectroscopy (CIS) to measure two-dimensional plasma velocity, (7) a Near-Infrared PCI (NI-PCI) based on a 1.55-μm fiber laser, (8) a Main-Ion Charge eXchange Recombination Spectroscopy (MI-CXRS) for main ion temperature measurement, and (9) a Fast Ion Dα Imaging (FIDA-I) to image two-dimensional energetic ion profiles. The main characteristic of these diagnostics is the high spatiotemporal resolution which is at the orders of millimeters and microseconds to meet the requirement of turbulence investigation. First experimental results obtained by using some of these new diagnostics, such as poloidal asymmetry of flow velocity during edge localized modes (ELMs), localized pedestal mode in high-β ELM-free H-mode, two-dimensional evolution of density blobs and the quasi-coherent mode in H-mode configuration, are also presented. More... »

PAGES

13

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10894-021-00302-8

DOI

http://dx.doi.org/10.1007/s10894-021-00302-8

DIMENSIONS

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7 schema:description In the last several years, great progress of optical and spectroscopic diagnostics has been achieved on the HL-2A tokamak. The main physical goal of these diagnostics is to measure plasma parameters for research of turbulence and transport. These diagnostics include: (1) a Phase Contrast Imaging to calculate wavenumber spectra based on a 10.6-μm CO2 laser, (2) a multi-channel (48 channels now and 324 channels for future) Beam Emission Spectroscopy (BES) based on neutral beam injection to measure Doppler-shifted 659.1-nm Dα line for density fluctuation measurement, (3) a four-channel Lyman-Alpha-Based BES (LAB) to measure 121-nm vacuum ultraviolet line for edge density fluctuation measurement, (4) a Gas Puff Imaging (GPI) to measure the intensity of 587.6-nm He I line to investigate plasma evolution, (5) a Multi-Color GPI (MC-GPI) to specify electron temperature and plasma density based on the line-intensity-ratio technique, (6) a Doppler Coherent Imaging Spectroscopy (CIS) to measure two-dimensional plasma velocity, (7) a Near-Infrared PCI (NI-PCI) based on a 1.55-μm fiber laser, (8) a Main-Ion Charge eXchange Recombination Spectroscopy (MI-CXRS) for main ion temperature measurement, and (9) a Fast Ion Dα Imaging (FIDA-I) to image two-dimensional energetic ion profiles. The main characteristic of these diagnostics is the high spatiotemporal resolution which is at the orders of millimeters and microseconds to meet the requirement of turbulence investigation. First experimental results obtained by using some of these new diagnostics, such as poloidal asymmetry of flow velocity during edge localized modes (ELMs), localized pedestal mode in high-β ELM-free H-mode, two-dimensional evolution of density blobs and the quasi-coherent mode in H-mode configuration, are also presented.
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14 schema:keywords CO2 laser
15 Doppler
16 Dα line
17 H-mode
18 HL-2A tokamak
19 Lyman
20 Optical
21 PCI
22 alpha
23 asymmetry
24 beam emission spectroscopy
25 beam injection
26 blobs
27 characteristics
28 charge exchange recombination spectroscopy
29 configuration
30 contrast
31 density
32 density blobs
33 density fluctuation measurements
34 diagnostics
35 edge
36 electron temperature
37 emission spectroscopy
38 evolution
39 exchange recombination spectroscopy
40 experimental results
41 fiber laser
42 first experimental results
43 flow velocity
44 fluctuation measurements
45 gas puff imaging
46 goal
47 great progress
48 high spatiotemporal resolution
49 imaging
50 imaging spectroscopy
51 injection
52 intensity
53 investigation
54 ion profiles
55 ion temperature measurements
56 laser
57 lines
58 main characteristics
59 measurements
60 microseconds
61 millimeters
62 mode
63 neutral beam injection
64 new diagnostics
65 order
66 order of millimeters
67 parameters
68 phase contrast
69 physical goals
70 plasma density
71 plasma evolution
72 plasma parameters
73 plasma velocity
74 poloidal asymmetry
75 profile
76 progress
77 quasi-coherent mode
78 ratio technique
79 recent progress
80 requirements
81 research
82 resolution
83 results
84 spatiotemporal resolution
85 spectra
86 spectroscopic diagnostics
87 spectroscopy
88 technique
89 temperature
90 temperature measurements
91 tokamak
92 transport
93 turbulence
94 turbulence investigations
95 two-dimensional evolution
96 ultraviolet lines
97 vacuum ultraviolet lines
98 velocity
99 wavenumber spectrum
100 years
101 schema:name Recent Progress of Optical and Spectroscopic Diagnostics for Turbulence on the HL-2A tokamak
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