Speaker
Matthew Smiley
(General Atomics MFE)
Description
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 images of the ITER divertor region via optical systems located in five upper ports. The 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 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 the most reliable mechanism to protect the first mirror. A geometrically representative glow discharge mirror cleaning system is being designed and will be tested to maximize cleaning efficacy 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 these eventual component replacement. The preliminary optical and structural design provides a robust and reliable system while maximizing the field of view. Analysis results verify all optical and structural performance criteria are being met with positive safety margins. The R&D efforts, the technical challenges and issues, and the design and analysis results are presented.
This work is supported in part by the US DOE under S013437-F11, DE-AC52-07NA2734422, DE-AC02-09CH1146633
Co-authors
A. McLean
(Lawrence Livermore National Laboratory, Livermore, California, United States)
A.L. Verlaan
(Netherlands Organisation for Applied Scientific Research (TNO), Stieltjesweg 1, 2600 AD Delft, Netherlands)
B. Stratton
(Princeton Plasma Physics Laboratory, Princeton, New Jersey, United States)
C. Lasnier
(Lawrence Livermore National Laboratory, Livermore, California, United States)
D. Johnson
(Princeton Plasma Physics Laboratory, Princeton, New Jersey, United States)
J. Vasquez
(General Atomics MFE, san diego, United States)
J.A.C. Heijmans
(Netherlands Organisation for Applied Scientific Research (TNO), Stieltjesweg 1, 2600 AD Delft, Netherlands)
M. Smith
(Lawrence Livermore National Laboratory, Livermore, California, United States)
Matthew Smiley
(General Atomics MFE, san diego, United States)
R. Feder
(Princeton Plasma Physics Laboratory, Princeton, New Jersey, United States)
R. O'Neill
(General Atomics MFE, san diego, United States)
