Feed Forward Polarization Control During ECRH Discharges at ASDEX Upgrade
Feed Forward Polarization Control During ECRH Discharges at ASDEX Upgrade
复制标题
ASDEX 升级中 ECRH 放电期间的前馈偏振控制
DOI：
10.13182/fst10-a10890
复制
发表时间：
2010
影响因子：
0.9
通讯作者：
H. Schütz
中科院分区：
文献类型：
--
作者：
D. Wagner;D. Schmid;J. Stober;H. Höhnle;F. Leuterer;E. Poli;F. Monaco;M. Münich;H. Schütz
ASDEX升级托卡马克上的新型电子回旋共振加热（ECRH）系统允许在等离子体放电期间调节注入的ECRH束的极化。在环面周围安装了3个毫米波杂散辐射嗅探探头，用于监测非吸收辐射。研究了不同的ecrh波束极化对探测杂散辐射的影响。对于垂直的X2加热，最小可检测到的错误（o2模式）极化量为5%。该系统还允许从X2到O2模式的偏振完全改变，因为它对O2加热高于X2模式截止是有用的。这些实验表明，由于环形倾斜的o2模式注入，杂散辐射具有很高的指向性。
Abstract The new electron cyclotron resonance heating (ECRH) system at the ASDEX Upgrade tokamak allows for an adjustment of the polarization of the injected ECRH beam during plasma discharges. Three sniffer probes for millimeter wave stray radiation, with broad and polarization insensitive radiation characteristics, have been installed around the torus to monitor nonabsorbed radiation. The influence of varying ECRH-beam polarization on the detected stray radiation is studied. For perpendicular X2 heating the minimum detectable amount of wrong (O2-mode) polarization is found to be 5%. The system also allows full change of polarization from X2 to O2 mode, as it is useful for O2 heating above the X2-mode cutoff. These experiments show a high directivity of the stray radiation due to the toroidally inclined O2-mode injection.