Dispersion interferometry diagnostic at Globus-M2

•The dispersion interferometer based on CO2 laser was developed for Globus-M2 tokamak.•Time resolution = 20 μs, spatial resolution = 0.02 m, measurement accuracy ≤ 1017m−2.•During the year long operation, DI has proven to be reliable diagnostic at Globus-M2.•It is planned to use DI measurements for...

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Bibliographic Details
Published in:	Fusion engineering and design Vol. 202; p. 114409
Main Authors:	Ivanenko, S.V., Solomakhin, A.l., Zubarev, P.V., Kvashnin, A.N., Kovalenko, Yu.V., Puryga, E.A., Solokha, V.V., Kurskiev, G.S., Zhiltsov, N.S., Shulyatiev, K.D., Khilchenko, A.D., Minaev, V.B., Bagryansky, P.A.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-05-2024
Subjects:	Data acquisition systems Dispersion interferometer Globus-M2 tokamak Plasma density control Plasma diagnostic Thomson scattering Globus-M2 tokamak Plasma density control Plasma diagnostic Thomson scattering Data acquisition systems Dispersion interferometer
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Summary:	•The dispersion interferometer based on CO2 laser was developed for Globus-M2 tokamak.•Time resolution = 20 μs, spatial resolution = 0.02 m, measurement accuracy ≤ 1017m−2.•During the year long operation, DI has proven to be reliable diagnostic at Globus-M2.•It is planned to use DI measurements for plasma density stabilizing in Globus-M2. The dispersion interferometry diagnostic (DI) based on the CO2-laser was commissioned at the Globus-M2 tokamak for absolute measurements of the line-integrated electron density (IED) along the chord in the equatorial plane. IED measurement error corresponding to the intrinsic noise of the acquisition device was below 1017m−2 with time and spatial resolution 20µs and 2 cm, respectively. Inference of the IED using the second harmonic interference was done by means of spectral algorithm. Execution of the algorithm is performed at the FPGA in real-time mode. During the year long operation, DI was proven to be reliable and robust IED diagnostic at Globus-M2.
ISSN:	0920-3796 1873-7196
DOI:	10.1016/j.fusengdes.2024.114409