Research output: Contribution to journal › Article › peer-review
High resolution Thomson scattering diagnostic for measurements of radial profiles of electron temperature and density in the gas dynamic trap. / Lizunov, A; Berbasova, T; Khilchenko, A et al.
In: Review of Scientific Instruments, Vol. 94, No. 3, 033509, 01.03.2023.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - High resolution Thomson scattering diagnostic for measurements of radial profiles of electron temperature and density in the gas dynamic trap
AU - Lizunov, A
AU - Berbasova, T
AU - Khilchenko, A
AU - Kvashnin, A
AU - Puryga, E
AU - Sandomirsky, A
AU - Zubarev, P
PY - 2023/3/1
Y1 - 2023/3/1
N2 - The incoherent Thomson scattering diagnostic with multiple lines of sight is installed at the gas dynamic trap (GDT) for measurements of radial profiles of the plasma electron temperature and density. The diagnostic is built on the Nd:YAG laser operating at 1064 nm. The laser input beamline is provided with an automatic system for alignment status monitoring and correction. The collecting lens uses ∼90° scattering geometry having 11 lines of sight in total. Presently, six of them (covering the full plasma radius from the axis to the limiter) are equipped with high etendue (f/2.4) interference filter spectrometers. The design of the spectrometer's data acquisition system based on the "time stretch" principle allowed for the 12 bits vertical resolution with a sampling rate of 5 GSample/s and a maximum sustainable measurement repetition frequency of 40 kHz. The repetition frequency is the crucial parameter for the study of plasma dynamics with a new pulse burst laser to be started in early 2023. Results of the diagnostic operation in several GDT campaigns show that radial profiles are routinely delivered with the typical observation error of 2%-3% for Te ⩾ 20 eV in a single pulse. After Raman scattering calibration, the diagnostic is capable to measure the electron density profile with the resolution ne (min)≃4⋅1018m-3 and error bars of 5%.
AB - The incoherent Thomson scattering diagnostic with multiple lines of sight is installed at the gas dynamic trap (GDT) for measurements of radial profiles of the plasma electron temperature and density. The diagnostic is built on the Nd:YAG laser operating at 1064 nm. The laser input beamline is provided with an automatic system for alignment status monitoring and correction. The collecting lens uses ∼90° scattering geometry having 11 lines of sight in total. Presently, six of them (covering the full plasma radius from the axis to the limiter) are equipped with high etendue (f/2.4) interference filter spectrometers. The design of the spectrometer's data acquisition system based on the "time stretch" principle allowed for the 12 bits vertical resolution with a sampling rate of 5 GSample/s and a maximum sustainable measurement repetition frequency of 40 kHz. The repetition frequency is the crucial parameter for the study of plasma dynamics with a new pulse burst laser to be started in early 2023. Results of the diagnostic operation in several GDT campaigns show that radial profiles are routinely delivered with the typical observation error of 2%-3% for Te ⩾ 20 eV in a single pulse. After Raman scattering calibration, the diagnostic is capable to measure the electron density profile with the resolution ne (min)≃4⋅1018m-3 and error bars of 5%.
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85151049505&origin=inward&txGid=55f1b6523ac8c19c93855325241e5fc9
UR - https://www.elibrary.ru/item.asp?id=50518681
U2 - 10.1063/5.0123329
DO - 10.1063/5.0123329
M3 - Article
C2 - 37012786
VL - 94
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
SN - 0034-6748
IS - 3
M1 - 033509
ER -
ID: 46990188