A tangentially viewing visible TV system for the DIII-D divertor

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Description

A video camera system has been installed on the DIII-D tokamak for 2-D spatial studies of line emission in the lower divertor region. The system views the divertor tangentially from an outer port at approximately the height of the X-point. At the tangency plane the entire divertor from inner wall to outside the DIII-D bias ring is viewed with spatial resolution of approximately 1 cm. The image contains information from approximately 90 degrees of toroidal angle. In a recent upgrade, remotely controllable filter changers were added which have produced images from nominally identical shots using a series of spectral lines. ... continued below

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20 p.

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Fenstermacher, M.E.; Meyer, W.H. & Wood, R.D. February 1, 1996.

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Description

A video camera system has been installed on the DIII-D tokamak for 2-D spatial studies of line emission in the lower divertor region. The system views the divertor tangentially from an outer port at approximately the height of the X-point. At the tangency plane the entire divertor from inner wall to outside the DIII-D bias ring is viewed with spatial resolution of approximately 1 cm. The image contains information from approximately 90 degrees of toroidal angle. In a recent upgrade, remotely controllable filter changers were added which have produced images from nominally identical shots using a series of spectral lines. Software was developed to calculate the response function matrix using distributed computing techniques and assuming toroidal symmetry. Standard sparse matrix algorithms are then used to invert the 3-D images onto a poloidal plane. Spatial resolution of the inverted images is 2 cm; higher resolution simply increases the size of the response function matrix. Initial results from a series of experiments with multiple identical shots show that the emission from CII and CIII, which appears along the inner scrape-off layer above and below the X-point during ELMing H-mode, moves outward and becomes localized near the X-point in Partially Detached Divertor (PDD) operation.

Physical Description

20 p.

Notes

OSTI as DE96011813

Source

  • 11. annual high-temperature plasma diagnostics conference, Monterey, CA (United States), 12-16 May 1996

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  • Other: DE96011813
  • Report No.: UCRL-JC--122839
  • Report No.: CONF-960543--7
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 243470
  • Archival Resource Key: ark:/67531/metadc670831

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  • February 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 17, 2016, 6:49 p.m.

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Fenstermacher, M.E.; Meyer, W.H. & Wood, R.D. A tangentially viewing visible TV system for the DIII-D divertor, article, February 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc670831/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.