A terahertz solid-state source interferometer-polarimeter designed for long pulse discharges on EAST.
Rev Sci Instrum
; 95(7)2024 Jul 01.
Article
en En
| MEDLINE
| ID: mdl-38953719
ABSTRACT
A 0.65 THz Solid-state Source Interferometer-Polarimeter (SSIP) with vertical viewing has been installed for line-integrated density and Faraday rotation measurements on Experimental Advanced Superconducting Tokamak (EAST). The SSIP utilizes three independent solid-state diode sources based on frequency multiplier (X48) to provide the probing beam at a fixed frequency of 0.65 THz with â¼2.5 mW output power, which provide an Intermediate Frequency (IF) with wide range, and the highest IF is up to â¼10 MHz. The mixers optimized for high sensitivity, â¼750 mV/mW, are used in the SSIP system, which permits multichannel interferometer-polarimeter on EAST with a low phase noise. The resolution of the integrated density is 3.3 × 1017 m-2, and the Faraday rotation is about 1.5°. The density measurement has been implemented with IF â¼0.85 MHz, in a plasma with plasma current â¼300 kA on EAST. The line-averaged density, 3.5 × 1019 m-3, measured by the SSIP shows good agreement with the results measured by the POlarimeter-INTerferometer (POINT) system and the CO2 dispersion interferometer system in the same discharge.
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MEDLINE
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En
Revista:
Rev Sci Instrum
/
Rev. sci. instrum
/
Review of scientific instruments
Año:
2024
Tipo del documento:
Article
País de afiliación:
China