Bench testing of a heterodyne CO2 laser dispersion interferometer for high temporal resolution plasma density measurements

Akiyama, T.; Van Zeeland, M. A.; Boivin, R. L.; Carlstrom, T. N.; Chavez, J. A.; Muscatello, C. M.; O’Neill, R. C.; Vasquez, J.; Watkins, M.; Martin, W.; Colio, A.; Finkenthal, D. K.; Brower, D. L.; Chen, J.; Ding, W. X.; Perry, M.

doi:10.1063/1.4969055

Title: Bench testing of a heterodyne CO₂ laser dispersion interferometer for high temporal resolution plasma density measurements

Journal Article · Thu Dec 08 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4969055· OSTI ID:1466040

Akiyama, T. ^[1]; Van Zeeland, M. A. ^[2]; Boivin, R. L. ^[2]; Carlstrom, T. N. ^[2]; Chavez, J. A. ^[2];

^[2]; O’Neill, R. C. ^[2]; Vasquez, J. ^[2]; Watkins, M. ^[2]; Martin, W. ^[2]; Colio, A. ^[3]; Finkenthal, D. K. ^[3]; Brower, D. L. ^[4]; Chen, J. ^[4]; Ding, W. X. ^[4]; Perry, M. ^[5]

National Institute for Fusion Science, Gifu (Japan)
General Atomics, San Diego, CA (United States)
Palomar College, San Diego, CA (United States)
Univ. of California Los Angeles, Los Angeles, CA (United States)
California State University, San Marcos, San Marcos, CA (United States)

Here, a heterodyne detection scheme is combined with a 10.59 μm CO₂ laser dispersion interferometer for the first time to allow large bandwidth measurements in the 10-100 MHz range. The approach employed utilizes a 40 MHz acousto-optic cell operating on the frequency doubled CO₂ beam which is obtained using a high 2nd harmonic conversion efficiency orientation patterned gallium arsenide crystal. The measured standard deviation of the line integrated electron density equivalent phase resolution obtained with digital phase demodulation technique, is 4 × 10¹⁷ m^–2. Air flow was found to significantly affect the baseline of the phase signal, which an optical table cover was able to reduce considerably. The heterodyne dispersion interferometer (DI) approach is found to be robustly insensitive to motion, with measured phase shifts below baseline drifts even in the presence of several centimeters of retroreflector induced path length variations. Plasma induced dispersion was simulated with a wedged ZnSe plate and the measured DI phase shifts are consistent with expectations.

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Research Organization:: Tech-X Corp., Boulder, CO (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-06ER54875; FC02-08ER54972

OSTI ID:: 1466040

Alternate ID(s):: OSTI ID: 1334833

Journal Information:: Review of Scientific Instruments, Vol. 87, Issue 12; ISSN 0034-6748

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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References (19)

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Cited By (4)

Design of a dispersion interferometer combined with a polarimeter to increase the electron density measurement reliability on ITER Akiyama, T.; Sirinelli, A.; Watts, C. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4962050	journal	September 2016
A heterodyne dispersion interferometer for wide bandwidth density measurements on DIII-D Akiyama, T.; Van Zeeland, M. A.; Boivin, R. L. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5037997	journal	October 2018
Design of compact dispersion interferometer with a high efficiency nonlinear crystal and a low power CO ₂ laser Akiyama, T.; Yoshimura, S.; Tomita, K. Journal of Instrumentation, Vol. 12, Issue 12 https://doi.org/10.1088/1748-0221/12/12/c12028	journal	December 2017
Real-time dispersion interferometry for density feedback in fusion devices Brunner, K. J.; Akiyama, T.; Hirsch, M. Journal of Instrumentation, Vol. 13, Issue 09 https://doi.org/10.1088/1748-0221/13/09/p09002	journal	September 2018

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