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Title: Tests of a full-scale ITER toroidal interferometer and polarimeter (TIP) prototype on the DIII-D tokamak (invited)

Abstract

A full-scale ITER toroidal interferometer and polarimeter (TIP) prototype, including an active feedback alignment system, has been installed and tested on the DIII-D tokamak. In the TIP prototype, a two-color interferometry measurement of line-integrated density is carried out at 10.59 μm and 5.22 μm using a CO 2 and quantum cascade laser, respectively, while a separate polarimetry measurement of the plasma-induced Faraday effect is made at 10.59 μm. The TIP prototype is equipped with a piezo tip/tilt stage active feedback alignment system that minimizes noise in the measurement and keeps the diagnostic aligned throughout DIII-D discharges. The measured phase resolution for the polarimeter and interferometer is 0.05° (100 Hz bandwidth) and 1.9° (1 kHz bandwidth), respectively. Here, the corresponding line-integrated density resolution for the vibration-compensated interferometer is δnL = 1.5 × 10 18 m -2, and the magnetic field-weighted line-integrated density from the polarimeter is δnBL = 1.5 × 10 19 Tm -2. Both interferometer and polarimeter measurements during DIII-D discharges compare well with the expectations based on calculations using Thomson scattering measured density profiles and magnetic equilibrium reconstructions. Additionally, larger bandwidth interferometer measurements show that the diagnostic is a sensitive monitor of core density fluctuations with demonstrated measurements ofmore » Alfvén eigenmodes and tearing modes.« less

Authors:
 [1]; ORCiD logo [1];  [2];  [3];  [1];  [2];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [4]; ORCiD logo [4];  [4]; ORCiD logo [5];  [1];  [6] more »;  [7];  [5] « less
  1. General Atomics, San Diego, CA (United States)
  2. Palomar Scientific Instruments, San Marcos, CA (United States)
  3. National Inst. for Fusion Science, Gifu (Japan)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  6. California State Univ., San Marcos, CA (United States)
  7. ITER Organization, Saint Paul Lez Durance Cedex (France)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1609188
Alternate Identifier(s):
OSTI ID: 1459747
Grant/Contract Number:  
FC02-04ER54698; AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; instruments & instrumentation; physics; polarimeters; plasma waves; tokamaks; Faraday effect; plasma diagnostics; lasers; optical polarimetry; interferometry

Citation Formats

Van Zeeland, M. A., Carlstrom, T. N., Finkenthal, D. K., Akiyama, T., Boivin, R. L., Colio, A., Du, D., Gattuso, A., Glass, F., Muscatello, C. M., O’Neill, R., Smiley, M., Vasquez, J., Watkins, M., Brower, D. L., Chen, J., Ding, W. X., Johnson, D., Mauzey, P., Perry, M., Watts, C., and Wood, R. Tests of a full-scale ITER toroidal interferometer and polarimeter (TIP) prototype on the DIII-D tokamak (invited). United States: N. p., 2018. Web. doi:10.1063/1.5037461.
Van Zeeland, M. A., Carlstrom, T. N., Finkenthal, D. K., Akiyama, T., Boivin, R. L., Colio, A., Du, D., Gattuso, A., Glass, F., Muscatello, C. M., O’Neill, R., Smiley, M., Vasquez, J., Watkins, M., Brower, D. L., Chen, J., Ding, W. X., Johnson, D., Mauzey, P., Perry, M., Watts, C., & Wood, R. Tests of a full-scale ITER toroidal interferometer and polarimeter (TIP) prototype on the DIII-D tokamak (invited). United States. doi:10.1063/1.5037461.
Van Zeeland, M. A., Carlstrom, T. N., Finkenthal, D. K., Akiyama, T., Boivin, R. L., Colio, A., Du, D., Gattuso, A., Glass, F., Muscatello, C. M., O’Neill, R., Smiley, M., Vasquez, J., Watkins, M., Brower, D. L., Chen, J., Ding, W. X., Johnson, D., Mauzey, P., Perry, M., Watts, C., and Wood, R. Wed . "Tests of a full-scale ITER toroidal interferometer and polarimeter (TIP) prototype on the DIII-D tokamak (invited)". United States. doi:10.1063/1.5037461. https://www.osti.gov/servlets/purl/1609188.
@article{osti_1609188,
title = {Tests of a full-scale ITER toroidal interferometer and polarimeter (TIP) prototype on the DIII-D tokamak (invited)},
author = {Van Zeeland, M. A. and Carlstrom, T. N. and Finkenthal, D. K. and Akiyama, T. and Boivin, R. L. and Colio, A. and Du, D. and Gattuso, A. and Glass, F. and Muscatello, C. M. and O’Neill, R. and Smiley, M. and Vasquez, J. and Watkins, M. and Brower, D. L. and Chen, J. and Ding, W. X. and Johnson, D. and Mauzey, P. and Perry, M. and Watts, C. and Wood, R.},
abstractNote = {A full-scale ITER toroidal interferometer and polarimeter (TIP) prototype, including an active feedback alignment system, has been installed and tested on the DIII-D tokamak. In the TIP prototype, a two-color interferometry measurement of line-integrated density is carried out at 10.59 μm and 5.22 μm using a CO2 and quantum cascade laser, respectively, while a separate polarimetry measurement of the plasma-induced Faraday effect is made at 10.59 μm. The TIP prototype is equipped with a piezo tip/tilt stage active feedback alignment system that minimizes noise in the measurement and keeps the diagnostic aligned throughout DIII-D discharges. The measured phase resolution for the polarimeter and interferometer is 0.05° (100 Hz bandwidth) and 1.9° (1 kHz bandwidth), respectively. Here, the corresponding line-integrated density resolution for the vibration-compensated interferometer is δnL = 1.5 × 1018 m-2, and the magnetic field-weighted line-integrated density from the polarimeter is δnBL = 1.5 × 1019 Tm-2. Both interferometer and polarimeter measurements during DIII-D discharges compare well with the expectations based on calculations using Thomson scattering measured density profiles and magnetic equilibrium reconstructions. Additionally, larger bandwidth interferometer measurements show that the diagnostic is a sensitive monitor of core density fluctuations with demonstrated measurements of Alfvén eigenmodes and tearing modes.},
doi = {10.1063/1.5037461},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {7}
}

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Works referenced in this record:

Fiber optic two-color vibration compensated interferometer for plasma density measurements
journal, October 2006

  • Van Zeeland, M. A.; Boivin, R. L.; Carlstrom, T. N.
  • Review of Scientific Instruments, Vol. 77, Issue 10
  • DOI: 10.1063/1.2336437

CO2 laser polarimeter for electron density profile measurement on the Large Helical Device
journal, May 2003

  • Akiyama, T.; Tsuji-Iio, S.; Shimada, R.
  • Review of Scientific Instruments, Vol. 74, Issue 5
  • DOI: 10.1063/1.1564276

Reconstruction of current profile parameters and plasma shapes in tokamaks
journal, November 1985


Conceptual design of the tangentially viewing combined interferometer-polarimeter for ITER density measurements
journal, April 2013

  • Van Zeeland, M. A.; Boivin, R. L.; Brower, D. L.
  • Review of Scientific Instruments, Vol. 84, Issue 4
  • DOI: 10.1063/1.4798602

Dual CO 2 laser interferometer with a wavelength combination of 10.6 and 9.27 μm for electron density measurement on large tokamaks
journal, April 1996

  • Kawano, Yasunori; Nagashima, Akira; Hatae, Takaki
  • Review of Scientific Instruments, Vol. 67, Issue 4
  • DOI: 10.1063/1.1146892

Laser Faraday rotation measurement of current density fluctuations and electromagnetic torque (invited)
journal, October 2004

  • Ding, W. X.; Brower, D. L.; Deng, B. H.
  • Review of Scientific Instruments, Vol. 75, Issue 10
  • DOI: 10.1063/1.1785275

CO2 laser polarimeter for Faraday rotation measurements in the DIII-D tokamak
journal, October 2008

  • Van Zeeland, M. A.; Boivin, R. L.; Carlstrom, T. N.
  • Review of Scientific Instruments, Vol. 79, Issue 10
  • DOI: 10.1063/1.2955859

Multichannel far-infrared polarimeter-interferometer system on the MST reversed field pinch
journal, January 2001

  • Brower, D. L.; Jiang, Y.; Ding, W. X.
  • Review of Scientific Instruments, Vol. 72, Issue 1
  • DOI: 10.1063/1.1321744

Tests of a two-color interferometer and polarimeter for ITER density measurements
journal, October 2017

  • Van Zeeland, M. A.; Carlstrom, T. N.; Finkenthal, D. K.
  • Plasma Physics and Controlled Fusion, Vol. 59, Issue 12
  • DOI: 10.1088/1361-6587/aa8c49

Toroidal interferometer/polarimeter density measurement system on ITER
journal, October 2004

  • Kondoh, T.; Costley, A. E.; Sugie, T.
  • Review of Scientific Instruments, Vol. 75, Issue 10
  • DOI: 10.1063/1.1786640

Real‐time, vibration‐compensated CO 2 interferometer operation on the DIII‐D tokamak
journal, July 1988

  • Carlstrom, T. N.; Ahlgren, D. R.; Crosbie, J.
  • Review of Scientific Instruments, Vol. 59, Issue 7
  • DOI: 10.1063/1.1139726