1. Zeff profile measurement system using a Thomson polychromator.
- Author
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Lee, Jong-Ha, Lee, Seung Hun, Son, Soohyun, Ko, Won Ha, Seo, Dong Cheol, and Yamada, Ichihiro
- Subjects
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POLYCHROMATORS , *BREMSSTRAHLUNG , *TOKAMAKS , *STELLARATORS , *ELECTRON density - Abstract
To measure the effective ion charge Z eff profile, most plasma machines are equipped with a bremsstrahlung measurement system as a filter-scope diagnostic device. In Korean Superconducting Tokamak Advanced Research (KSTAR) machine, a new type of bremsstrahlung measurement system, called hybrid-type polychromator system, was developed and tested at a single position during the 10th KSTAR plasma campaign [1] . The main idea of this hybrid-type polychromator system is to combine a polychromator system, which can measure the Thomson scattering signal, with a bremsstrahlung signal measurement system. The advantages of this hybrid-type polychromator system include the reduction of diagnostic vacuum windows in the Tokamak or Stellarator, and the measurement of the Z eff parameter with electron temperature ( T e ) and electron density ( n e ) at a same position. In this study, we improve last year's hybrid-type polychromator system. A major improvement is the change in the structure of the optical system. This allows measuring the bremsstrahlung signals more clearly, and four hybrid-type polychromators were equipped to measure the Z eff profile preliminarily. In this paper, we explain the structure of the hybrid-type polychromator and the system's measurement results. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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