NDLI: Design status of the ITER ECH Upper Launcher Steering Mirror Mechanism

Content Provider	IEEE Xplore Digital Library
Author	Landis, J.-D. Chavan, R. Henderson, M. Bertizzolo, R. Collazos, A. Sanchez, F.
Copyright Year	2007
Description	Author affiliation: Assoc. Euratom Confederation Suisse, Lausanne (Landis, J.-D.; Chavan, R.; Henderson, M.; Bertizzolo, R.; Collazos, A.; Sanchez, F.)
Abstract	The ITER ECRH upper port antenna (or launcher) will be used to drive current locally for stabilising the neoclassical tearing mode (NTM) by depositing ram-wave power inside of the island which forms on the q=3/2 or 2 rational magnetic flux surfaces and control the sawtooth instability by driving current near the q=l surface. This requires the launcher to be capable of steering the focused beam deposition location across the resonant flux surface over the range where the q=l, 3/2 and 2 surfaces are expected to be found (roughly the outer half of the plasma). ITER'S present reference design uses a front steering (FS) concept, which uses a moveable mirror close to the plasma. Two separate mirrors are used to decouple the focusing and steering aspects resulting in an optimized optical configuration providing a well focused beam over a large steering range. The steering mechanism providing the mirror rotation uses a frictionless and backlash free mechanical system based on the elastically compliant deformation of structural components to avoid the in vessel tribological difficulties. Traditional designs are based on push-pull rods acting on a mirror which rotates with ball bearings, they present the risk of gripping or result in stick-slip movements. The ball bearings are replaced with a set of flexure pivots while the classic actuation through a push-pull rod scheme is replaced by a directly acting pneumatic system consisting on a fast feed line, bellows and springs, in which the pressure acting on the bellows pushes the mirror against the compressive springs. The rotation of the mirror is thus produced by the counteraction between the forces exerced by the springs and the bellows, themselves piloted by the pressure of the system. A servovalve placed outside of the port plug and connected to the bellows by a small tube will control this pressure. The system also includes flexible water cooling pipes which allow the removal of heat generated by the ohmic surface losses of the reflected mm-wave beams and the nuclear and radiation volumic heating of the rotating mirror components. This paper will give an overview of the engineering and design issues and their solutions, and provide the development status of the different components of the mechanism. Special attention will be given to the engineering analysis performed to ensure compliance of the steering mechanism with the various ITER requirements.
Starting Page	1
Ending Page	4
File Size	10267367
Page Count	4
File Format	PDF
ISBN	9781424411931
DOI	10.1109/FUSION.2007.4337928
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Mirrors Rough surfaces Surface roughness Bellows Springs Particle beams Plasmas Ball bearings Water heating Magnetic flux Flexure pivot ITER ECRH upper port antenna Steering mirror Bellow
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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A frictionless steering mechanism for the Front Steering ECCD ITER Upper Port Launcher

The Design and Physics Performance of the ITER Upper Port ECH Front Steering Launcher

Design status of the iter upper port launcher.

Design of the Remote-Steering ITER ECRH Upper-Port Launcher

The ITER ECH & CD Upper Launcher: Steps towards final design of the first confinement system

The ECH front steering launcher for the ITER upper port

Design and manufacturing of the iter ecrh upper launcher mirrors.

The enhanced performance launcher design for the iter upper port ech antenna.

Shield components adopted to the ITER ECRH upper launcher

Design status of the ITER ECH Upper Launcher Steering Mirror Mechanism

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