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Data analysis scheme for correcting general misalignments of an optics configuration for a voltage measurement system based on the Pockels electro-optic effect

Cited 3 time in Web of Science Cited 3 time in Scopus
Authors

Choi, Seongmin; Lee, Dong-Geun; Woo, H. J.; Hong, S. H.; Ham, Seunggi; Ryu, Jonghyeon; Chung, Kyoung-Jae; Hwang, Y. S.; Ghim, Y. -c.

Issue Date
2021-04
Publisher
American Institute of Physics
Citation
Review of Scientific Instruments, Vol.92 No.4, p. 043105
Abstract
Having a sub-ns response time and not requiring physical contacts to the measurement points, a voltage measurement system based on the Pockels electro-optic effect, referred to as a PE (Pockels effect)-based voltmeter, is widely used for pulsed high voltage devices such as accelerators and X-pinch systems. To correct for the misalignment of a Pockels cell and the transmittance ratio of a beam splitter, a polar-coordinate-based data analysis scheme has been proposed. This scheme also overcomes a limitation on the measurable range of a PE-based voltmeter without ambiguity and can measure the half-wave voltage of a Pockels cell. We present an improved polar-coordinate-based data analysis scheme using an ellipse fitting method, which can correct for misalignments of all the optics components of a PE-based voltmeter while keeping the advantages of the previous scheme. We show the results of the improved data analysis scheme for measuring a slowly modulated voltage up to approximately 5 kV in about 30 s and a pulsed high voltage up to 7 kV with a rise time of less than 20 ns.
ISSN
0034-6748
URI
https://hdl.handle.net/10371/179751
DOI
https://doi.org/10.1063/5.0040467
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