Polarization and Mode Control of EAST 140 GHz ECRH&CD System
Tóm tắt
The 140 GHz electron cyclotron heating and current drive (ECRH&CD) project was launched in 2011 on EAST tokamak facility, which is designed to launch 4 MW of total power for the duration up to 1,000 s into the plasma. The heating and current drive efficiencies depend on the wave coupling mode in plasma and the coupling performance relies on polarization characteristics of injected beam, so polarization control is necessary for efficient plasma heating and current drive. Two polarizer miter bends will be used to control the wave polarization for each transmission line on EAST ECRH&CD system, any required wave polarization can be produced by adjusting the mirror rotation angle of each polarizer miter bend. This work mainly shows the calculated polarizer mirror settings as a function of the injection angles for pure second extraordinary harmonic mode coupling.
Tài liệu tham khảo
X.J. Wang, F.K. Liu, J.F. Shan et al., Status of ECRH project on EAST Tokamak. AIP Conf. Proc. 1580, 538–540 (2014)
J.H. Jeong, Y.S. Bae, M.H. Cho et al., Study of elliptical polarization requirement of KSTAR 84-GHz ECH system. J. Korean Phys. Soc. 49, 201–205 (2006)
S.I. Park, J.H. Jeong, W. Namkung et al., Commissioning of KSTAR 84-GHz ECH transmission system. Fusion Sci. Technol. 55, 60–62 (2009)
W. Wei, B.J. Ding, X.J. Zhang et al., Numerical simulation of electron cyclotron current drive characteristics on EAST. Chin. Phys. B 23, 055202–055203 (2014)
G.Q. Zhang, K. Nagasaki, J. Zhou et al., A polarizer with sinusoidal grooves in the electron cyclotron resonance heating system of the HL-2A Tokamak. Plasma Sci. Technol. 11, 620–623 (2009)
K. Nagasaki, Y. Itoh, K. Sakamoto et al., Polarizers with non-rectangular grooves for high power millimeter waves. Fusion Eng. Des. 53, 492–493 (2001)
J. Doane, Polarizations Required in ECH Transmission Lines with Application to DIII-D. General Atomics (2002)
D.H. Xia, M. Huang, S.D. Song et al., Coupling of electron cyclotron waves to the desired mode in plasma of HL-2A tokamak. Fusion Eng. Des. 88, 2991–2996 (2013)
M. Lennholm, G. Agarici, G. Berger-By et al., The ECRH/ECCD system on Tore Supra, a major step towards continuous operation. Nucl. Fusion 43, 1458–1476 (2003)