5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P2.075 Zeff profile measurement system by using Thomson Polychromator

6 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 75
Poster D. Diagnostics, Data Acquisition and Remote Participation P2 Poster session

Speaker

Jong-ha Lee (National Fusion Research Institute (NFRI))

Description

To measure Zeff profile, most plasma machine equipped brehmsstrahlung measurement system like as filterscope diagnostic. In KSTAR, however, a new type brehmsstrahlung measurement system developed and tested at single point in KSTAR 10th campaign in last year.[1] In 2016 KSTAR campaign, to Zeff profile measurement, we expand this concepts of brehmsstrahlung measurement system to multi points; two for core and two for edge. Thus four polychromators are modified to the new type polychromator that include bandpass filters for Thomson scattering and brehmsstrahlung signal. In case of detection system that have five APDs for Thomson and one PMT for Zeff. To calculate Zeff by using brehmsstrahlung signal, calibration of wavelength and light intensity of radiation are necessary. The calibration is performed in the vacuum vessel and laboratory. In the vacuum vessel, a tungsten bulb and spectrometer are used, and in the laboratory, monochromator with tungsten light are used for wavelength calibration. By using new type polychromator system, we can measure Te, ne and Zeff profiles simultaneous and at the same position. Moreover we can save a vacuum window for diagnostic system. In this research, explain the configuration of new type polychromator system and calibration result. Reference [1] J.H. Lee, S.H. Lee, S.H. Son, W.H. Ko, D.C. Seo, I. Yamada, K.H. Her, J.S. Jeon and M.G. Bog, JINST, 10, C12012 (2015)

Co-authors

Dong-cheol Seo (National Fusion Research Institute (NFRI), Daejeon Yuseong-gu, South Korea) Ichihro Yamada (National Institute for Fusion Science (NIFS), Toki, Japan) Jong-ha Lee (National Fusion Research Institute (NFRI), Daejeon Yuseong-gu, South Korea) Soo-hyun Son (National Fusion Research Institute (NFRI), Daejeon Yuseong-gu, South Korea) Suong-hun Lee (National Fusion Research Institute (NFRI), Daejeon Yuseong-gu, South Korea) Won-ha Ko (National Fusion Research Institute (NFRI), Daejeon Yuseong-gu, South Korea)

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