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Title: Design update of the ITER upper wide angle viewing system

Abstract

One of the diagnostic systems being provided by the US is the Upper Wide Angle Viewing System (UWAVS) which provides real-time, simultaneous visible and infrared (IR) images of the ITER divertor regions via optical systems located in five upper ports. UWAVS is designed in three main sections: in-vessel, interspace and port cell assemblies. Each assembly utilizes multiple steering and relay mirrors to direct the in-vessel light out of the tokamak to the port cell camera sensors. The primary design challenge of the in-vessel assembly is maximizing performance of the overall system while surviving the severe electromagnetic and nuclear ITER environment. A first mirror material study was conducted and determined that single crystal molybdenum was the best choice for the first two mirrors in the optical train. A fail open, bellows actuated shutter with cross pivot flexure design was determined to be the most reliable mechanism to protect the first mirror. A geometrically representative glow discharge mirror cleaning system is being created and will be tested to maximize cleaning effectiveness while minimizing optical degradation of the molybdenum mirrors adjacent to the plasma. The shutter and first mirror assemblies were packaged and designed for replacement via remote handling methods to minimize radiationmore » waste and cost associated with eventual component replacement. The preliminary optical and structural design provides a robust and reliable system while maximizing the field of view. The R&D efforts, the technical challenges and issues, and the design and analysis results are introduced.« less

Authors:
 [1];  [2];  [1];  [2];  [2];  [3];  [3];  [3];  [3];  [3];  [4];  [4]
  1. General Atomics, San Diego, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  4. Netherlands Organisation for Applied Scientific Research, Delft, (Netherlands)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1542747
Report Number(s):
LLNL-JRNL-777838
Journal ID: ISSN 0920-3796; 961015
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Volume: 123; Journal Issue: C; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ITER; WAVS; R&D; Upper port; Diagnostics

Citation Formats

Smiley, Matthew, O’Neill, R., Vasquez, J., Lasnier, C., McLean, A., Feder, R., Smith, M., Jariwala, A., Stratton, B., Johnson, D., Verlaan, A., and Heijmans, J. Design update of the ITER upper wide angle viewing system. United States: N. p., 2017. Web. doi:10.1016/j.fusengdes.2017.03.130.
Smiley, Matthew, O’Neill, R., Vasquez, J., Lasnier, C., McLean, A., Feder, R., Smith, M., Jariwala, A., Stratton, B., Johnson, D., Verlaan, A., & Heijmans, J. Design update of the ITER upper wide angle viewing system. United States. doi:10.1016/j.fusengdes.2017.03.130.
Smiley, Matthew, O’Neill, R., Vasquez, J., Lasnier, C., McLean, A., Feder, R., Smith, M., Jariwala, A., Stratton, B., Johnson, D., Verlaan, A., and Heijmans, J. Sun . "Design update of the ITER upper wide angle viewing system". United States. doi:10.1016/j.fusengdes.2017.03.130. https://www.osti.gov/servlets/purl/1542747.
@article{osti_1542747,
title = {Design update of the ITER upper wide angle viewing system},
author = {Smiley, Matthew and O’Neill, R. and Vasquez, J. and Lasnier, C. and McLean, A. and Feder, R. and Smith, M. and Jariwala, A. and Stratton, B. and Johnson, D. and Verlaan, A. and Heijmans, J.},
abstractNote = {One of the diagnostic systems being provided by the US is the Upper Wide Angle Viewing System (UWAVS) which provides real-time, simultaneous visible and infrared (IR) images of the ITER divertor regions via optical systems located in five upper ports. UWAVS is designed in three main sections: in-vessel, interspace and port cell assemblies. Each assembly utilizes multiple steering and relay mirrors to direct the in-vessel light out of the tokamak to the port cell camera sensors. The primary design challenge of the in-vessel assembly is maximizing performance of the overall system while surviving the severe electromagnetic and nuclear ITER environment. A first mirror material study was conducted and determined that single crystal molybdenum was the best choice for the first two mirrors in the optical train. A fail open, bellows actuated shutter with cross pivot flexure design was determined to be the most reliable mechanism to protect the first mirror. A geometrically representative glow discharge mirror cleaning system is being created and will be tested to maximize cleaning effectiveness while minimizing optical degradation of the molybdenum mirrors adjacent to the plasma. The shutter and first mirror assemblies were packaged and designed for replacement via remote handling methods to minimize radiation waste and cost associated with eventual component replacement. The preliminary optical and structural design provides a robust and reliable system while maximizing the field of view. The R&D efforts, the technical challenges and issues, and the design and analysis results are introduced.},
doi = {10.1016/j.fusengdes.2017.03.130},
journal = {Fusion Engineering and Design},
number = C,
volume = 123,
place = {United States},
year = {2017},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: Representative system layout in an upper port.

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