A reduced-turbulence regime in the Large Helical Device upon injection of low-Z materials powders

Nespoli, Federico ; Tanaka, Kenji; Masuzaki, Suguru ; Ashikawa, Naoko; Shoji, Mamoru ; Gilson, Erik ; Lunsford, Robert ; Oishi, Tetsutarou; Ida, Katsumi ; Yoshinuma, Mikirou; Takemura, Yuki ; Kinoshita, Toshiki ; Motojima, Gen ; Osakabe, Masaki ; Kenmochi, Naoki ; Kawamura, Gakushi ; Suzuki, Chihiro ; Nagy, Alex ; Bortolon, Alessandro ; Pablant, Novimir ; Mollén, Albert ; Tamura, Naoki ; Gates, David ; Morisaki, Tomohiro
Issue date: 2023
Cite as:
Nespoli, Federico, Tanaka, Kenji, Masuzaki, Suguru, Ashikawa, Naoko, Shoji, Mamoru, Gilson, Erik, Lunsford, Robert, Oishi, Tetsutarou, Ida, Katsumi, Yoshinuma, Mikirou, Takemura, Yuki, Kinoshita, Toshiki, Motojima, Gen, Osakabe, Masaki, Kenmochi, Naoki, Kawamura, Gakushi, Suzuki, Chihiro, Nagy, Alex, Bortolon, Alessandro, Pablant, Novimir, Mollén, Albert, Tamura, Naoki, Gates, David, & Morisaki, Tomohiro. A reduced-turbulence regime in the Large Helical Device upon injection of low-Z materials powders [Data set]. Princeton Plasma Physics Laboratory, Princeton University. https://doi.org/10.34770/g0cf-b557
@electronic{nespoli_federico_unknown,
  author      = {Nespoli, Federico and
                Tanaka, Kenji and
                Masuzaki, Suguru and
                Ashikawa, Naoko and
                Shoji, Mamoru and
                Gilson, Erik and
                Lunsford, Robert and
                Oishi, Tetsutarou and
                Ida, Katsumi and
                Yoshinuma, Mikirou and
                Takemura, Yuki and
                Kinoshita, Toshiki and
                Motojima, Gen and
                Osakabe, Masaki and
                Kenmochi, Naoki and
                Kawamura, Gakushi and
                Suzuki, Chihiro and
                Nagy, Alex and
                Bortolon, Alessandro and
                Pablant, Novimir and
                Mollén, Albert and
                Tamura, Naoki and
                Gates, David and
                Morisaki, Tomohiro},
  title       = {{A reduced-turbulence regime in the Large
                 Helical Device upon injection of low-Z
                materials powders}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  url         = {https://doi.org/10.34770/g0cf-b557}
}
Description:

Recently an improved confinement regime, characterized by reduced turbulent fluctuations has been observed in the Large Helical Device upon the injection of boron powder into the plasma (Nespoli et al 2022 Nat. Phys.18 350–56). In this article, we report in more detail the experimental observations of increased plasma temperature and the decrease of turbulent fluctuations across the plasma cross section, on an extended database. In particular, we compare powders of different materials (B, C, BN), finding similar temperature improvement and turbulence response for the three cases. Modeling of the powder penetration into the plasma and of neoclassical electric field and fluxes support the interpretation of the experimental results. Additionally, we report evidence of the temperature improvement increasing with powder injection rates and decreasing for both increasing density and heating power. Though, plasma turbulence response varies depending on the initial conditions of the plasma, making it difficult to draw an inclusive description of the phenomenon.

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# Filename Filesize
1 178485t7090_v1_ambipolarSolutions.h5 169 KB
2 178486t7090_v1_ambipolarSolutions.h5 200 KB
3 178486t7090_v2_ambipolarSolutions.h5 200 KB
4 178490t7090_v2_ambipolarSolutions.h5 234 KB
5 B_source.txt 1.68 KB
6 CXSdata_167233_t5.25.txt 2.42 KB
7 CXSdata_167234_t5.25.txt 2.42 KB
8 CXSdata_178504_t7.txt 14.2 KB
9 CXSdata_178505_t7.txt 9.47 KB
10 CXSproffit_167233_t5.25.txt 3.22 KB
11 CXSproffit_167234_t5.25.txt 3.22 KB
12 CXSproffit_178504_t7.txt 3.22 KB
13 CXSproffit_178505_t7.txt 3.22 KB
14 DYTRANS_178485.txt 17.8 KB
15 DYTRANS_178486.txt 17.8 KB
16 DYTRANS_178487.txt 17.8 KB
17 DYTRANS_178490.txt 17.8 KB
18 EMC3_profiles.txt 23.9 KB
19 Ha_gas_178485.txt 62.7 KB
20 Ha_gas_178486.txt 62.7 KB
21 Ha_gas_178487.txt 62.7 KB
22 Ha_gas_178490.txt 62.7 KB
23 PCI_PSD_166254_t5.txt 196 KB
24 PCI_PSD_167233_t5.2.txt 196 KB
25 PCI_PSD_167234_t5.2.txt 196 KB
26 PCI_PSD_178476_t7.txt 196 KB
27 PCI_PSD_178485_t7.txt 196 KB
28 PCI_PSD_178486_t7.txt 196 KB
29 PCI_PSD_178487_t7.txt 196 KB
30 PCI_PSD_178490_t7.txt 196 KB
31 PCI_PSD_178494_t5.txt 196 KB
32 PCI_PSD_178494_t7.txt 196 KB
33 PCI_PSD_178496_t7.txt 196 KB
34 PCI_PSD_178504_t7.txt 196 KB
35 PCI_PSD_178505_Freq.txt 68 KB
36 PCI_PSD_178505_PSD.txt 76.3 MB
37 PCI_PSD_178505_t.txt 19.1 KB
38 PCI_PSD_178505_t7.txt 196 KB
39 PCI_PSD_178510_t4.txt 196 KB
40 PCI_PSD_178510_t7.txt 196 KB
41 PCIdn_166254_t5.txt 3.21 KB
42 PCIdn_167233_t5.2.txt 3.23 KB
43 PCIdn_167234_t5.2.txt 3.23 KB
44 PCIdn_178476_t7.txt 3.21 KB
45 PCIdn_178485_t7.txt 3.21 KB
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48 PCIdn_178496_t7.txt 3.21 KB
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51 PCIdn_178510_t4.txt 3.21 KB
52 PCIdn_178510_t7.txt 3.21 KB
53 PMC_0166256_2p5U-AH02-02-NF.mp4 9.85 MB
54 README.txt 4.83 KB
55 Spec_178485_tst_7.0000_len_200_fmin_20_fmax_500.dat 11.5 KB
56 Spec_178486_tst_7.0000_len_200_fmin_20_fmax_500.dat 11.5 KB
57 Spec_178487_tst_7.0000_len_200_fmin_20_fmax_500.dat 11.5 KB
58 Spec_178490_tst_7.0000_len_200_fmin_20_fmax_500.dat 11.5 KB
59 TSdata_167233_t5.25.txt 11.1 KB
60 TSdata_167234_t5.25.txt 11.1 KB
61 TSdata_178504_t7.txt 11 KB
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63 TSproffit_167233_t5.25.txt 4.81 KB
64 TSproffit_167234_t5.25.txt 4.81 KB
65 TSproffit_178504_t7.txt 4.79 KB
66 TSproffit_178505_t7.txt 4.79 KB
67 Te0_178485 10.3 KB
68 Te0_178486 10.6 KB
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75 Ti0_178487 19.1 KB
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79 bolo@178485.dat 551 KB
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83 firc@178485.dat 55.3 KB
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89 flux_surf.txt 1.01 MB
90 imp02@178485.dat 109 KB
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94 input_power_178504.txt 1.01 MB
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96 ipd_spec@178485.dat 139 KB
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99 ipd_spec@178490.dat 139 KB
100 ipd_spec@178504.dat 139 KB
101 ipd_spec@178505.dat 139 KB
102 nB_toroidal_prof.txt 13.6 KB
103 ne0_178485 17 KB
104 ne0_178486 17.5 KB
105 ne0_178487 16.1 KB
106 ne0_178490 18 KB
107 neutral_source_B.txt 1.68 KB
108 neutral_source_C.txt 1.68 KB
109 plotEMC3_1.txt 49.8 MB
110 plotEMC3_2.txt 49.8 MB
111 plotEMC3_3.txt 49.8 MB
112 plotEMC3_4.txt 8.02 MB
113 plotEMC3_5.txt 8.04 MB
114 plotEMC3_6.txt 7.99 MB
115 plotEMC3_7.txt 8.02 MB
116 plotEMC3_8.txt 8.02 MB
117 relative_variations_Bscan.txt 2.5 KB
118 relative_variations_Pscan.txt 2.49 KB
119 relative_variations_diffpow.txt 564 Bytes
120 relative_variations_nescan.txt 1.8 KB
121 trajectory_X.txt 6.36 MB
122 trajectory_Y.txt 6.36 MB
123 trajectory_Z.txt 6.36 MB
124 wp@178485.dat 16.4 MB
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127 wp@178490.dat 16.4 MB