Kajita Shin, Hatae Takaki, Tojo Hiroshi, Enokuchi Akito, Hamano Takashi, Shimizu Katsuhiro, Kawashima Hisato
Nagoya University, Nagoya 464-8603, Japan.
Japan Atomic Energy Agency, Naka, Ibaraki 801-1, Japan.
Rev Sci Instrum. 2015 Aug;86(8):083511. doi: 10.1063/1.4929514.
For the satellite tokamak JT-60 Super Advanced (JT-60SA), a divertor Thomson scattering measurement system is planning to be installed. In this study, we improved the design of the collection optics based on the previous one, in which it was found that the solid angle of the collection optics became very small, mainly because of poor accessibility to the measurement region. By improvement, the solid angle was increased by up to approximately five times. To accurately assess the measurement performance, background noise was assessed using the plasma parameters in two typical discharges in JT-60SA calculated from the SONIC code. Moreover, the influence of the reflection of bremsstrahlung radiation by the wall is simulated by using a ray tracing simulation. The errors in the temperature and the density are assessed based on the simulation results for three typical field of views.
对于卫星托卡马克JT-60超级先进装置（JT-60SA），正计划安装一套偏滤器汤姆逊散射测量系统。在本研究中，我们在之前设计的基础上对收集光学器件进行了改进，发现之前收集光学器件的立体角变得非常小，主要原因是测量区域的可达性较差。通过改进，立体角增加了约五倍。为了准确评估测量性能，利用从SONIC代码计算出的JT-60SA中两次典型放电的等离子体参数评估了背景噪声。此外，通过光线追踪模拟来模拟轫致辐射在壁上的反射影响。基于三个典型视场的模拟结果评估了温度和密度的误差。
