Design status of the ITER ECRH upper launcher mm-wave system

J.-D. Landis, R. Chavan, R. Bertizzolo, A. Collazos, F. Dolizy, F. Felici, F. Sanchez, M. Henderson

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

3 Citations (Scopus)

Abstract

The purpose of the ITER electron cyclotron resonance heating (ECRH) upper launcher (UL), or antennae will be to provide localised current drive by accurately directing mm-wave beams up to 2MW, out of the four allocated upper port plugs, at chosen rational magnetic flux surfaces in order to stabilise neoclassical tearing modes (NTMs). This paper will present an overview of the UL, with emphasis on the mm-wave components. The mm-wave layout includes corrugated waveguide sections and a quasi-optical path with both focusing mirrors and plane steering mirrors. One of the essential components of the UL is the Steering Mechanism Assembly (SMA), providing variable poloidal injection angles fulfilling high deposition accuracy requirements at the plasma location. The Actuator principle and rotor bearings are frictionless and backlash free, avoiding tribological difficulties such as stickslip and seizure. The underlying working principle is the use of mechanically compliant structures. Validation and proof testing of the steering principle is achieved with an uncooled first prototype demonstrator. A second prototype is currently being manufactured, comprising the functionalities needed for the ITER compatible system such as water cooling and high power mm-wave compatibility. In order to perform the fatigue tests of the actuator bellows, a test facility has been built, under ITER-like vacuum and temperature working conditions. Results of the cyclic fatigue tests are compared to the various manufacturer standards and codes, combining stress and strain controlled material fatigue properties.
Original languageEnglish
Title of host publicationProceeding of the 25th Symposium on Fusion Technology (SOFT-25), 15-19 September 2008, Rostock, Germany
Pages1151-1155
DOIs
Publication statusPublished - 2009

Publication series

NameFusion Engineering and Design
Number7-11
Volume84
ISSN (Print)0920-3796

Fingerprint

Electron cyclotron resonance
Heating
Fatigue of materials
Bearings (structural)
Actuators
Bellows
Cooling water
Magnetic flux
Test facilities
Waveguides
Rotors
Vacuum
Antennas
Plasmas
Testing
Temperature

Cite this

Landis, J-D., Chavan, R., Bertizzolo, R., Collazos, A., Dolizy, F., Felici, F., ... Henderson, M. (2009). Design status of the ITER ECRH upper launcher mm-wave system. In Proceeding of the 25th Symposium on Fusion Technology (SOFT-25), 15-19 September 2008, Rostock, Germany (pp. 1151-1155). (Fusion Engineering and Design; Vol. 84, No. 7-11). https://doi.org/10.1016/j.fusengdes.2009.01.077
Landis, J.-D. ; Chavan, R. ; Bertizzolo, R. ; Collazos, A. ; Dolizy, F. ; Felici, F. ; Sanchez, F. ; Henderson, M. / Design status of the ITER ECRH upper launcher mm-wave system. Proceeding of the 25th Symposium on Fusion Technology (SOFT-25), 15-19 September 2008, Rostock, Germany. 2009. pp. 1151-1155 (Fusion Engineering and Design; 7-11).
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Landis, J-D, Chavan, R, Bertizzolo, R, Collazos, A, Dolizy, F, Felici, F, Sanchez, F & Henderson, M 2009, Design status of the ITER ECRH upper launcher mm-wave system. in Proceeding of the 25th Symposium on Fusion Technology (SOFT-25), 15-19 September 2008, Rostock, Germany. Fusion Engineering and Design, no. 7-11, vol. 84, pp. 1151-1155. https://doi.org/10.1016/j.fusengdes.2009.01.077

Design status of the ITER ECRH upper launcher mm-wave system. / Landis, J.-D.; Chavan, R.; Bertizzolo, R.; Collazos, A.; Dolizy, F.; Felici, F.; Sanchez, F.; Henderson, M.

Proceeding of the 25th Symposium on Fusion Technology (SOFT-25), 15-19 September 2008, Rostock, Germany. 2009. p. 1151-1155 (Fusion Engineering and Design; Vol. 84, No. 7-11).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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AB - The purpose of the ITER electron cyclotron resonance heating (ECRH) upper launcher (UL), or antennae will be to provide localised current drive by accurately directing mm-wave beams up to 2MW, out of the four allocated upper port plugs, at chosen rational magnetic flux surfaces in order to stabilise neoclassical tearing modes (NTMs). This paper will present an overview of the UL, with emphasis on the mm-wave components. The mm-wave layout includes corrugated waveguide sections and a quasi-optical path with both focusing mirrors and plane steering mirrors. One of the essential components of the UL is the Steering Mechanism Assembly (SMA), providing variable poloidal injection angles fulfilling high deposition accuracy requirements at the plasma location. The Actuator principle and rotor bearings are frictionless and backlash free, avoiding tribological difficulties such as stickslip and seizure. The underlying working principle is the use of mechanically compliant structures. Validation and proof testing of the steering principle is achieved with an uncooled first prototype demonstrator. A second prototype is currently being manufactured, comprising the functionalities needed for the ITER compatible system such as water cooling and high power mm-wave compatibility. In order to perform the fatigue tests of the actuator bellows, a test facility has been built, under ITER-like vacuum and temperature working conditions. Results of the cyclic fatigue tests are compared to the various manufacturer standards and codes, combining stress and strain controlled material fatigue properties.

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BT - Proceeding of the 25th Symposium on Fusion Technology (SOFT-25), 15-19 September 2008, Rostock, Germany

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Landis J-D, Chavan R, Bertizzolo R, Collazos A, Dolizy F, Felici F et al. Design status of the ITER ECRH upper launcher mm-wave system. In Proceeding of the 25th Symposium on Fusion Technology (SOFT-25), 15-19 September 2008, Rostock, Germany. 2009. p. 1151-1155. (Fusion Engineering and Design; 7-11). https://doi.org/10.1016/j.fusengdes.2009.01.077