High-sensitivity plasma density retrieval in a common-path second-harmonic interferometer through simultaneous group and phase velocity measurement

van Tilborg, J.; Gonsalves, A. J.; Esarey, E.; Schroeder, C. B.; Leemans, W. P.

doi:10.1063/1.5080269

Title: High-sensitivity plasma density retrieval in a common-path second-harmonic interferometer through simultaneous group and phase velocity measurement

Journal Article · Wed Feb 13 00:00:00 EST 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5080269· OSTI ID:1616971

van Tilborg, J. ^[1];

^[1]; Esarey, E. ^[1]; Schroeder, C. B. ^[1];

^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Precise measurements of the plasma density in ionized gas cells and discharged capillaries are critical to the design and operation of plasma-based accelerators, active plasma lenses, and plasma-based radiation sources. In this manuscript, a spectral-domain common-path second-harmonic interferometer is upgraded with the simultaneous measurement of the group and phase velocity, allowing for high-sensitivity density characterization (from the phase velocity advance) without the need for phase tracking from zero-density (enabled by the group velocity delay). The technique is applied to 1.5-cm-long plasma structures, without density ambiguity in parameter scans with >2π phase jumps. Finally, the single-shot sensitivity in phase retrieval is demonstrated at 63 mrad, equivalent to a density-length product of 1.8·10¹⁵ cm^-2. This is an improvement of ×45 compared to group velocity analysis alone.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; PHY-1632796

OSTI ID:: 1616971

Journal Information:: Physics of Plasmas, Vol. 26, Issue 2; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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