Remote Metrology, Mapping, and Motion Sensing of Plasma Facing Components Using FM Coherent Laser Radar

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Metrology inside a D/T burning fusion reactor must necessarily be conducted remotely since the in-vessel environment would be highly radioactive due to neutron activation of the torus walls. A technique based on frequency modulated coherent laser radar (FM CLR) for such remote metrology is described. Since the FM CLR relies on frequency shift to measure distances, the results are largely insensitive to surface reflectance characteristics. Results of measurements in TFTR and NSTX fusion devices using a prototype FM CLR unit, capable of remotely measuring distances (range) up to 22 m with better than 0.1-mm precision, are provided. These results illustrate ... continued below

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15 pages

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Menon, M.M.; Barry, R.E.; Slotwinsky, A.; Kugel, H.W. & Skinner, C.H. September 11, 2000.

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Description

Metrology inside a D/T burning fusion reactor must necessarily be conducted remotely since the in-vessel environment would be highly radioactive due to neutron activation of the torus walls. A technique based on frequency modulated coherent laser radar (FM CLR) for such remote metrology is described. Since the FM CLR relies on frequency shift to measure distances, the results are largely insensitive to surface reflectance characteristics. Results of measurements in TFTR and NSTX fusion devices using a prototype FM CLR unit, capable of remotely measuring distances (range) up to 22 m with better than 0.1-mm precision, are provided. These results illustrate that the FM CLR can be used for precision remote metrology as well as viewing. It is also shown that by conducting Doppler corrected range measurements using the CLR, the motion of objects can be tracked. Thus, the FM CLR has the potential to remotely measure the motion of plasma facing components (PFCs) during plasma disruptions.

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15 pages

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INIS; OSTI as DE00772470

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  • 21st Symposium on Fusion Technology, Madrid (ES), 09/11/2000--09/15/2000

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  • Report No.: P00-108391
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 772470
  • Archival Resource Key: ark:/67531/metadc718239

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  • September 11, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • Jan. 20, 2016, 4:28 p.m.

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Menon, M.M.; Barry, R.E.; Slotwinsky, A.; Kugel, H.W. & Skinner, C.H. Remote Metrology, Mapping, and Motion Sensing of Plasma Facing Components Using FM Coherent Laser Radar, article, September 11, 2000; Tennessee. (digital.library.unt.edu/ark:/67531/metadc718239/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.