Salewski M, Meo F, Bindslev H, Furtula V, Korsholm S B, Lauritzen B, Leipold F, Michelsen P K, Nielsen S K, Nonbøl E
Association EURATOM-Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Roskilde DK-4000, Denmark.
Rev Sci Instrum. 2008 Oct;79(10):10E729. doi: 10.1063/1.2956961.
Collective Thomson scattering (CTS) has the capabilities to measure phase space densities of fast ion populations in ITER resolved in configuration space, in velocity space, and in time. In the CTS system proposed for ITER, probing radiation at 60 GHz generated by two 1 MW gyrotrons is scattered in the plasma and collected by arrays of receivers. The transmission lines from the gyrotrons to the plasma and from the plasma to the receivers contain several quasioptical mirrors among other components. These are designed to produce astigmatic beam patterns in the plasma where the beam shapes will have a direct impact on the signal strength of the diagnostic, the spatial resolution, and the robustness of probe and receiver beam overlap against density excursions. The first mirror has a line of sight to the plasma and is thus exposed to severe neutron streaming. The present neutronics and thermomechanical modeling of a first mirror on the high field side indicates that the mirror curvature may warp due to heating. This may alter the beam quality, and therefore, thermal effects have to be accounted for during the design of the mirror. The modeling further demonstrates that thin mirrors are superior to thick mirrors from a thermomechanical point of view.
集体汤姆逊散射（CTS）能够测量ITER中快离子群体在构型空间、速度空间和时间上分辨的相空间密度。在为ITER提议的CTS系统中，由两个1兆瓦回旋管产生的60吉赫兹探测辐射在等离子体中散射，并由接收器阵列收集。从回旋管到等离子体以及从等离子体到接收器的传输线包含几个准光学镜以及其他部件。这些准光学镜旨在在等离子体中产生像散光束模式，其中光束形状将直接影响诊断的信号强度、空间分辨率以及探测器和接收器光束重叠对密度变化的鲁棒性。第一个镜子与等离子体有视线连接，因此会受到严重的中子流影响。目前对高场侧第一个镜子的中子学和热机械建模表明，镜子曲率可能会因加热而变形。这可能会改变光束质量，因此，在镜子设计过程中必须考虑热效应。该建模进一步表明，从热机械角度来看，薄镜子优于厚镜子。
