| Autor: |
Pasqualotto, Roberto, Tojo, Hiroshi, Fassina, Alessandro, Giudicotti, Leonardo, Nardino, Vanni, Oyama, Naoyuki, Pelli, Stefano, Raimondi, Valentina, Ricciarini, Sergio, Soare, Sorin, Davis, Sam, Sozzi, Carlo, Hiroshi, Tojo, Naoyuki, Oyama |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Zdroj: |
Journal of Instrumentation. 15:C01011 |
| ISSN: |
1748-0221 |
| Popis: |
JT-60SA will complement ITER in resolving key issues to finally decide an acceptable DEMO design. Diagnostics play a key role in this mission. The electron temperature and density profiles are measured by a core and an edge Thomson scattering (TS) diagnostics with high spatial resolution, needed to identify the pedestal parameters and small profile structures. The two systems use a common tangential Nd:YAG laser beam path in the plasma equatorial plane. The collection optics for the edge system (low field side) is hosted in a lower oblique port and that for the core system in a horizontal port. The optics fit in the port plug tube and image the scattering volumes into an array of fiber bundles. They both are exposed to a high neutron dose of 10^16 n/cm^2 over 13 years of operation. The optics are supported by a mechanical structure decoupled from the cryostat. A set of filter polychromators with avalanche photodiode (APD) detectors spectrally analyze the scattered radiation. The development of the TS systems is carried out by a joint Japan-EU team. The conceptual design of the edge TS system is presented here. Simulations of the TS signals show acceptable accuracy down to 1 × 10^19 m^−3 electron density, sufficient to measure the edge gradient and even a small region outside the separatrix. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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