Blob properties in I-mode and ELM-free H-mode compared to L-mode on EAST

Ping WANG; Guanghai HU; Liang WANG; Ning YAN; Xiaoming ZHONG; Guosheng XU; Xi FENG; Yang YE; Genfan DING; Lin YU; Adi LIU; Yanmin DUAN; Erzhong LI; Liqing XU; Haiqing LIU; Rui DING; Bin ZHANG; Miaohui LI; Bojiang DING; Chengming QIN; Xinjun ZHANG; Xiaojie WANG; Bo LYU; Ling ZHANG; Mingfu WU; Qing ZANG; Xin LIN; Xiaolan ZOU; Yuntao SONG

doi:10.1088/2058-6272/aca741

Plasma Science and Technology > 2023 > 25(4): 045106. > DOI: 10.1088/2058-6272/aca741

Ping WANG, Guanghai HU, Liang WANG, Ning YAN, Xiaoming ZHONG, Guosheng XU, Xi FENG, Yang YE, Genfan DING, Lin YU, Adi LIU, Yanmin DUAN, Erzhong LI, Liqing XU, Haiqing LIU, Rui DING, Bin ZHANG, Miaohui LI, Bojiang DING, Chengming QIN, Xinjun ZHANG, Xiaojie WANG, Bo LYU, Ling ZHANG, Mingfu WU, Qing ZANG, Xin LIN, Xiaolan ZOU, Yuntao SONG. Blob properties in I-mode and ELM-free H-mode compared to L-mode on EAST[J]. Plasma Science and Technology, 2023, 25(4): 045106. DOI: 10.1088/2058-6272/aca741

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Blob properties in I-mode and ELM-free H-mode compared to L-mode on EAST

1.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
2.
University of Science and Technology of China, Hefei 230026, People's Republic of China
3.
Institute of Energy, Hefei Comprehensive National Science Centre, Hefei 230031, People's Republic of China
4.
Shenzhen University, Shenzhen 518061, People's Republic of China
5.
CEA, IRFM, F-13108 St Paul Les Durance, France

More Information

Corresponding author:
Guanghai HU, E-mail: ghhu@ipp.ac.cn
Received Date: September 02, 2022
Revised Date: November 24, 2022
Accepted Date: November 28, 2022
Available Online: December 05, 2023
Published Date: February 23, 2023

Graphical Abstract

Abstract

Abstract

The blob properties in I-mode and ELM-free H-mode plasmas compared to L-mode have been investigated on the EAST tokamak, including the blob detection rate $N_{b},$ size $δ_{b},$ lifetime $τ_{b}$ and radial velocity $v_{r, b} .$ The blob properties in L-mode and I-mode are similar, and those in ELM-free H-mode are different to them. The blob $N_{b}$ is smaller while $τ_{b}$ is larger in H-mode. The experimental blob size $δ_{b}$ and velocity scalings $v_{r, b} - δ_{b}$ show a good agreement with the theoretical models. The variation in blob properties during the L-I and H-L transitions, and their relations to the scrape-off layer (SOL) density, edge and SOL turbulence, and SOL collisionality are discussed. The suppression of the edge (inside the last closed flux surface) turbulence is not reflected in the blob behavior, while the blob detection rate shows a correlation with the SOL density and its low-frequency (3–50 kHz) fluctuations. In addition, the blob detection rate is found to increase with the divertor collisionality $Λ_{div},$ indicating a dependence of blob behavior on $Λ_{div} .$ The differences in blob detection rates among the three operating regimes might be due to their different SOL densities and collisionalities. The investigation contributes to understanding the influences of edge and SOL plasma parameters on the blob behavior.
- blobs,
- I-mode,
- ELM-free H-mode,
- lithium beam emission spectroscopy,
- EAST

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Acknowledgments

The authors acknowledge the support and contributions of the EAST Team. The work is supported by the National Key R & D Program of China (Nos. 2022YFE03020004, 2017YFE0301300, 2018YFE0303104 and 2019YFE03030000), the Major Science and Technology Infrastructure Maintenance and Reconstruction Projects of the Chinese Academy of Sciences, National Natural Science Foundation of China (Nos. 12275313, 11922513, 12005004 and U19A20113), the Institute of Energy, Hefei Comprehensive National Science Center (No. GXXT-2020-004), the Anhui Provincial Natural Science Foundation (No. 2008085QA38) and the Users with Excellence Program of Hefei Science Center, Chinese Academy of Sciences (No. 2020HSC-UE009).

References (55)

References

[1]	Doyle E J et al 2007 Nucl. Fusion 47 S18 doi: 10.1088/0029-5515/47/6/S02
[2]	Ye Y et al 2017 Nucl. Fusion 57 086041 doi: 10.1088/1741-4326/aa7809
[3]	Ryter F et al 1998 Plasma Phys. Control. Fusion 40 725 doi: 10.1088/0741-3335/40/5/032
[4]	Suttrop W et al 2003 Plasma Phys. Control. Fusion 45 1399 doi: 10.1088/0741-3335/45/8/302
[5]	Greenwald M et al 1999 Phys. Plasmas 6 1943 doi: 10.1063/1.873451
[6]	Burrell K H et al 2002 Plasma Phys. Control. Fusion 44 A253 doi: 10.1088/0741-3335/44/5A/325
[7]	Rimini F G et al 1999 Nucl. Fusion 39 1591 doi: 10.1088/0029-5515/39/11/310
[8]	Scotti F et al 2013 Nucl. Fusion 53 083001 doi: 10.1088/0029-5515/53/8/083001
[9]	Whyte D G et al 2010 Nucl. Fusion 50 105005 doi: 10.1088/0029-5515/50/10/105005
[10]	Hubbard A E et al 2017 Nucl. Fusion 57 126039 doi: 10.1088/1741-4326/aa8570
[11]	White A E et al 2011 Nucl. Fusion 51 113005 doi: 10.1088/0029-5515/51/11/113005
[12]	Ryter F et al 2017 Nucl. Fusion 57 016004 doi: 10.1088/0029-5515/57/1/016004
[13]	Viezzer E et al 2013 Nucl. Fusion 53 053005 doi: 10.1088/0029-5515/53/5/053005
[14]	Happel T et al 2017 Plasma Phys. Control. Fusion 59 014004 doi: 10.1088/0741-3335/59/1/014004
[15]	Marinoni A et al 2015 Nucl. Fusion 55 093019 doi: 10.1088/0029-5515/55/9/093019
[16]	Feng X et al 2019 Nucl. Fusion 59 096025 doi: 10.1088/1741-4326/ab28a7
[17]	Burrell K H et al 2005 Phys. Plasmas 12 056121 doi: 10.1063/1.1894745
[18]	Antar G Y et al 2001 Phys. Rev. Lett. 87 065001 doi: 10.1103/PhysRevLett.87.065001
[19]	Endler M et al 1995 Nucl. Fusion 35 1307 doi: 10.1088/0029-5515/35/11/I01
[20]	Neuhauser J et al 2002 Plasma Phys. Control. Fusion 44 855 doi: 10.1088/0741-3335/44/6/316
[21]	Garcia O E et al 2007 Nucl. Fusion 47 667 doi: 10.1088/0029-5515/47/7/017
[22]	Chang C S et al 2017 Nucl. Fusion 57 116023 doi: 10.1088/1741-4326/aa7efb
[23]	Fuchert G et al 2014 Plasma Phys. Control. Fusion 56 125001 doi: 10.1088/0741-3335/56/12/125001
[24]	Griener M et al 2020 Nucl. Mater. Energy 25 100854 doi: 10.1016/j.nme.2020.100854
[25]	Terry J L et al 2005 Nucl. Fusion 45 1321 doi: 10.1088/0029-5515/45/11/013
[26]	Boedo J A et al 2001 Phys. Plasmas 8 4826 doi: 10.1063/1.1406940
[27]	Zweben S J et al 2015 Nucl. Fusion 55 093035 doi: 10.1088/0029-5515/55/9/093035
[28]	Zweben S J et al 2017 Phys. Plasmas 24 102509 doi: 10.1063/1.5002695
[29]	Zoletnik S et al 2018 Rev. Sci. Instrum. 89 063503 doi: 10.1063/1.5017224
[30]	Willensdorfer M et al 2014 Plasma Phys. Control. Fusion 56 025008 doi: 10.1088/0741-3335/56/2/025008
[31]	Johnsen H, Pécseli H L and Trulsen J 1987 Phys. Fluids 30 2239 doi: 10.1063/1.866158
[32]	Boedo J A et al 2003 Phys. Plasmas 10 1670 doi: 10.1063/1.1563259
[33]	Birkenmeier G et al 2014 Plasma Phys. Control. Fusion 56 075019 doi: 10.1088/0741-3335/56/7/075019
[34]	Wang P et al 2022 Plasma Sci. Technol. 24 075103 doi: 10.1088/2058-6272/ac5f82
[35]	Zhang S B et al 2014 Plasma Sci. Technol. 16 311 doi: 10.1088/1009-0630/16/4/02
[36]	Wang Y M et al 2013 Fusion Eng. Des. 88 2950 doi: 10.1016/j.fusengdes.2013.06.004
[37]	Qu H et al 2015 Plasma Sci. Technol. 17 985 doi: 10.1088/1009-0630/17/12/01
[38]	Zang Q et al 2011 Rev. Sci. Instrum. 82 063502 doi: 10.1063/1.3599039
[39]	Hu J Q et al 2017 Rev. Sci. Instrum. 88 073504 doi: 10.1063/1.4991855
[40]	Liu A D et al 2020 Nucl. Fusion 60 126016 doi: 10.1088/1741-4326/abb14a
[41]	Liu Y J et al 2020 Nucl. Fusion 60 082003 doi: 10.1088/1741-4326/ab88e0
[42]	Myra J R, Russell D A and D'Ippolito D A 2006 Phys. Plasmas 13 112502 doi: 10.1063/1.2364858
[43]	Aydemir A Y 2005 Phys. Plasmas 12 062503 doi: 10.1063/1.1927539
[44]	Yu G Q and Krasheninnikov S I 2003 Phys. Plasmas 10 4413 doi: 10.1063/1.1616937
[45]	Manz P et al 2013 Phys. Plasmas 20 102307 doi: 10.1063/1.4824799
[46]	Garcia O E, Bian N H and Fundamenski W 2006 Phys. Plasmas 13 082309 doi: 10.1063/1.2336422
[47]	Krasheninnikov S I 2001 Phys. Lett. A 283 368 doi: 10.1016/S0375-9601(01)00252-3
[48]	Carralero D et al 2015 Phys. Rev. Lett. 115 215002 doi: 10.1103/PhysRevLett.115.215002
[49]	Myra J R et al 2006 Phys. Plasmas 13 092509 doi: 10.1063/1.2355668
[50]	Carralero D et al 2014 Nucl. Fusion 54 123005 doi: 10.1088/0029-5515/54/12/123005
[51]	Wang H Q et al 2014 Phys. Plasmas 21 092511 doi: 10.1063/1.4896237
[52]	D'Ippolito D A, Myra J R and Zweben S J 2011 Phys. Plasmas 18 060501 doi: 10.1063/1.3594609
[53]	Zweben S J et al 2007 Plasma Phys. Control. Fusion 49 S1 doi: 10.1088/0741-3335/49/7/S01
[54]	LaBombard B et al 2005 Nucl. Fusion 45 1658 doi: 10.1088/0029-5515/45/12/022
[55]	Agostini M et al 2007 Phys. Plasmas 14 102305 doi: 10.1063/1.2776912

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