Abstract
Mitigation of Edge localized mode(ELM) has been achieved with different external actuators such as lower hybrid wave (LHW), mixture supersonic molecular beam injection(SMBI), and laser blow-off(LBO) impurity seeding on HL-2A. During these experiments, the pedestal turbulence enhancement is commonly observed, which is found closely related to ELM mitigation. The turbulence enhancement is caused by the externally driven the velocity shear rate without change of the turbulence correlation length, but correlated to its radial wavenumber spectral shift. A common plausible mechanism for the ELM mitigation with different external source input seems to be involved. A modified theoretical model based on the turbulence radial wavenumber spectral shift is used and successfully interprets the experimental observations. The simulation suggests that a critical growth rate of the most unstable mode, also identified by the experimental results, survives in the competition of the velocity shear rate, enhancing the turbulence intensity. An example of the LHW case is used and good agreements have been found between the experimental results and simulation results.
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References
F. Wagner et al., Phys. Rev. Lett. 49, 1408 (1982)
F. Wagner, Eur. Phys. J. H 43, 523–549 (2018)
R.J. Groebner, Phys. Fluids B 5, 2343 (1993)
H. Zohm, Plasma Phys. Control. Fusion 38, 105 (1996)
A. Loarte et al., Plasma Phys. Control. Fusion 45, 1549 (2003)
G. Federici et al., J. Nucl. Mater. 313–6, 11 (2003)
W.P. West et al., Nucl. Fusion 45, 1708 (2005)
K.H. Burrell et al., Nucl. Fusion 49, 085024 (2009)
W. Suttrop et al., Nucl. Fusion 45, 721 (2005)
W. Suttrop et al., Plasma Phys. Control. Fusion 45, 1399 (2003)
Y. Sakamoto et al., Plasma Phys. Control 46, A299 (2004)
W.L. Zhong et al., Nucl. Fusion 53, 083030 (2013)
D.G. Whyte et al., Nucl. Fusion 50, 105005 (2010)
F. Ryter et al., Nucl. Fusion 57, 016004 (2017)
A. Marinoni et al., Nucl. Fusion 55, 093019 (2015)
X. Feng et al., Nucl. Fusion 59, 096025 (2019)
T. Ozeki et al., Nucl. Fusion 30, 1425 (1990)
N. Oyama et al., Nucl. Fusion 45, 871 (2005)
J. Stober et al., Nucl. Fusion 41, 1123 (2001)
Q.Q. Yang et al., Nucl. Fusion 60, 076012 (2020)
P.T. Lang et al., Nucl. Fusion 43, 1110 (2003)
T.E. Evans et al., Phys. Rev. Lett. 92, 235003 (2004)
W.W. Xiao et al., Nucl. Fusion 52, 114027 (2012)
A.W. Degeling et al., Plasma Phys. Control. Fusion 45, 1637 (2003)
Y. Liang et al., Phys. Rev. Lett. 110, 235002 (2013)
S. Jachmich et al., Plasma Phys. Control. Fusion 44, 1879 (2002)
P.T. Lang et al., Nucl. Fusion 44, 665 (2004)
F. Romanelli et al., Nucl. Fusion 49, 104006 (2009)
L.R. Baylor et al., Phys. Rev. Lett. 110, 245001 (2013)
Zou X.L. et al 2012 Proc. 24th Int. Conf. on Fusion Energy 2012 (San Diego, CA, 8–13 October 2012) PD/P8–08 (www-naweb.iaea.org/napc/physics/FEC/FEC2012/index.htm)
W.W. Xiao et al., Nucl. Fusion 54, 023003 (2014)
H.Y. Lee et al., Phys. Plasmas 22, 122512 (2015)
T.E. Evans et al., Nat. Phys. 2, 419 (2006)
Y. Liang et al., Phys. Rev. Lett. 98, 265004 (2007)
A. Kirk et al., Nucl. Fusion 50, 034008 (2010)
W. Suttrop et al., Phys. Rev. Lett. 106, 225004 (2011)
Y.W. Sun et al., Phys. Rev. Lett. 117, 115001 (2016)
X.R. Duan et al., Nucl. Fusion 57, 102013 (2017)
P.T. Lang et al., Plasma Phys. Control. Fusion 46, L31 (2004)
L.D. Horton et al., Plasma Phys. Control. Fusion 46, B511 (2004)
J.X. Rossel et al., Nucl. Fusion 52, 032004 (2012)
J.G. Li et al., Nat. Phys. 9, 817 (2013)
G.L. Xiao et al., Phys. Plasmas 24, 122507 (2017)
R. Maingi et al., Phys. Rev. Lett. 107, 145004 (2011)
M.N.A. Beurskens et al., Nucl. Fusion 48, 095004 (2008)
Y.P. Zhang et al., Nucl. Fusion 58, 046018 (2018)
P.B. Snyder et al., Phys. Plasmas 9, 2037 (2002)
G.T.A. Huysmans et al., Plasma Phys. Control. Fusion 51, 124012 (2009)
B.D. Dudson et al., Plasma Phys. Control. Fusion 53, 054005 (2011)
Chandra et al., Nucl. Fusion 57, 076001 (2017)
T. Rhee et al., Phys. Plasmas 27, 072503 (2020)
G.R. McKee et al., Nucl. Fusion 53, 113011 (2013)
X.R. Duan et al., Nucl. Fusion 50, 095011 (2010)
M. Xu et al., Nucl. Fusion 59, 112017 (2019)
Z.Y. Cui et al., Chin. Phys. Lett. 23, 2143 (2006)
Z.Y. Cui et al., Nucl. Fusion 53, 093001 (2013)
W.W. Xiao et al., Rev. Sci. Instrum. 81, 013506 (2010)
Z.C. Yang et al., Phys. Plasmas 23, 012515 (2015)
W.L. Zhong et al., Nucl. Fusion 59, 076033 (2019)
L. Nie et al., Plasma Phys. Control. Fusion 56, 055006 (2014)
J. Li et al., Nucl. Fusion 59, 076013 (2019)
G.M. Staebler et al., Phys. Rev. Lett. 110, 055003 (2013)
G.S. Xu et al., Phys. Rev. Lett. 116, 095002 (2016)
M.K. Han et al., Nucl. Fusion 57, 046019 (2017)
G.L. Xiao et al., Phys. Plasmas 26, 072303 (2019)
P.W. Xi et al., Phys. Rev. Lett. 112, 085001 (2014)
G.L. Xiao et al., Nucl. Fusion 59, 12603 (2019)
Xiao G.L. et al IAEA Fusion Energy Conference, Ahmedabad, India, 26th Oct. 2018, p. EX/7–4.
Acknowledgements
This work was supported by the National Key R&D Program of China under Grant Nos. 2017YFE0301100 and 2017YFE0301106. This work was also partially supported by the National Natural Science Foundation of China (Grant Nos. 11775070 and 11575055), Young Elite Scientists Sponsorship Program by CAST (No. 2016QNRC001), and Sichuan Science and Technology Program (No. 2018JY0054). This work was also partially supported within the framework of the cooperation between the French Commissariat a l’Energie Atomique et aux Energies Alternatives (CEA) and the China National Nuclear Corporation (CNNC).
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Xiao, G.L., Zhong, W.L., Zhang, Y.P. et al. Overview of the Recent Study on ELM Mitigation Physics with Different External Actuators on HL-2A Tokamak. J Fusion Energ 39, 300–312 (2020). https://doi.org/10.1007/s10894-021-00281-w
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DOI: https://doi.org/10.1007/s10894-021-00281-w