Optical and Mechanical Design of C-Mod Motional Stark Effect Diagnostic

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Description

A Motional Stark Effect (MSE) instrument is being installed on the Alcator C-Mod tokamak at MIT. This MSE diagnostic will provide measurements of the spatial profile of the internal poloidal magnetic field. The MSE has its primary collection optics inside the vacuum vessel. The light collected by the internal optics passes through a vacuum window and is relayed to a fiber optic array. The MSE optics are shared by a Beam Emission Spectroscopy (BES) diagnostic which measures electron density fluctuations and their spatial correlations. This optical system requires high throughput and spatial resolution of less than 1 cm at the ... continued below

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154 Kilobytes pages

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Simon, D.I.; Marmar, E.; Bretz, N.L.; Bravenec, R. & Parsells, R.F. November 1, 1999.

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Description

A Motional Stark Effect (MSE) instrument is being installed on the Alcator C-Mod tokamak at MIT. This MSE diagnostic will provide measurements of the spatial profile of the internal poloidal magnetic field. The MSE has its primary collection optics inside the vacuum vessel. The light collected by the internal optics passes through a vacuum window and is relayed to a fiber optic array. The MSE optics are shared by a Beam Emission Spectroscopy (BES) diagnostic which measures electron density fluctuations and their spatial correlations. This optical system requires high throughput and spatial resolution of less than 1 cm at the focal plane in the plasma. The design requirements for the internal optics also include the effects associated with plasma impingement, plasma disruptions, and thermal excursions. The parameters that affect polarization measurement include the location and orientation of optical elements, the choice of substrates and optical materials. These unique design requirements led to a number of interesting optical and mechanical design features which are presented here.

Physical Description

154 Kilobytes pages

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INIS; OSTI as DE00014501

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  • Other Information: PBD: 1 Nov 1999

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  • Report No.: PPPL-3383
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/14501 | External Link
  • Office of Scientific & Technical Information Report Number: 14501
  • Archival Resource Key: ark:/67531/metadc620759

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 1, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 15, 2016, 10:06 p.m.

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Simon, D.I.; Marmar, E.; Bretz, N.L.; Bravenec, R. & Parsells, R.F. Optical and Mechanical Design of C-Mod Motional Stark Effect Diagnostic, report, November 1, 1999; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc620759/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.