29D24P
ヘリオトロンJにおけるトムソン散乱計測装置
ヘリオトロン におけるNd:YAGトムソンにおけるトムソン散乱計測装置の散乱計測装置の高精度散乱分光装置の高精度散乱分光装置の開発
Development of high precision polychromator for scattering light of
Nd:YAG Thomson scattering measurement for Heliotron J
荒井翔平 1, 南貴司 2, 釼持尚輝 1, 高橋千尋 2, 小林進二 2, 水内亨 2, 大島慎介 2, 山本聡 2,
岡田浩之 2, 長崎百伸 2, 李炫庸 1, 臧臨閣 1, 沙夢雨 1 , 杉本幸薫 1, 永榮蓉子 1, 中村雄一 1,橋本紘平 1, 福島浩文 1, 安田圭祐 1, 和多田泰士 1, 中村祐司 2, 木島滋 2, 佐野史道 2
Shohei Arai1, Takashi Minami2, Naoki Kenmochi1, Chihiro Takahashi2, Shinji Kobayashi2,Tohru Mizuuchi2, Shinsuke Ohshima2, Satoshi Yamamoto2, Hiroyuki Okada2, Kazunobu Nagasaki2,Hyunyong Lee1, Linge Zang1, Yukishige Sugimoto1, Yoko Nagae1, Yuuichi Nakamura1,Kohei Hashimoto1, Hirofumi Fukushima1, Keisuke Yasuda1, Hiroto Watada1, Yuji Nakamura2,
Shigeru Konoshima2, Fumimichi Sano2
1Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0001, Japan京都大学エネルギー科学研究科 〒611-0001 宇治市五ヶ庄
2Institute of Advanced Energy Science, Kyoto University, Gokasho, Uji 611-0001, Japan京都大学エネルギー理工学研究所 〒611-0001 宇治市五ヶ庄

The wavelength of polychromator was calibrated tomeasure the plasma profile with high precision using adata acquisition system and a variable wavelength lightsource. The calibration method is to inject a varying
wavelength light which comes from the light source tothe polychromator by changing the wavelength of themonochromator. Next, the injected light is converted tothe signal by the polychromator and transferred to theacquisition system. The Figure 1 shows the spectrum
obtained by polychromator as an initial result. The
green, lime green, blue, magenta and red line showCh.1, Ch.2, Ch.3, Ch.4 and Ch.5, respectively. The
minimum wavelength step size of the monochromator
is 0.028nm, therefore we can calibrate polychromatorwith very high precision.
spectral sensitivity[a.u.]

To investigate the plasma transport phenomena whichchange quickly, it is important to measure the time
evolution of plasma profile with high accuracy.
Therefore we are designing and developing a new
Nd:YAG Thomson scattering measurement system for
Heliotron J, which can measure the time evolution ofelectron temperature and density profiles. The
Nd:YAG Thomson scattering measurement system
consists of a laser and transmission system, acollecting system of scattering light, a polychromatorsystem and a data acquisition system. In this paper,
we focus on the results of the performance tests of thepolychromator and the data acquisition systems.
The polychromator is a device to disperse thescattering light. One polychromator consists of 6Ch.
detectors; 5Ch. are used for measuring scattering lightintensity, and 1Ch. is used for density calibration. It
outputs the scattering light intensity by dispersing
specific wavelength using the interference filters.
Furthermore, we designed and manufactured a
pre-amplifier which amplifies the output signal andeliminates the background light. It was found that thepolychromator has an enough performance to measure
the electron temperature.
The data acquisition system is a system which canprocess the rapid scattering light signal under thecondition that the laser pulse width is 10ns. Thissystem acquires analog signal from the polychromatorand it digitizes the analog signal with the charge
integral type AD/C. The acquired data are transferredto the data acquisition computer, which is calledCINOS. Finally, these data are analyzed bytransferring to the analyzing computer.

30252015105700

800

900
wavelength[nm]1000Fig.1 Initial result of the spectrum of a polychromator
Our next work is to measure the plasma profile of theelectron temperature and density with more highprecision and to investigate the plasma transportphenomena.