Progress of the ECRH Upper Launcher design for ITER

Strauß, D.; Aiello, G.; Bruschi, A.; Chavan, R.; Farina, D.; Figini, L.; Gagliardi, Mario; García, Vicente Jesús Serradell; Goodman, T.; Grossetti, G.; Heemskerk, C.J.M.; Henderson, M.; Kasparek, W.; Krause, A.; Landis, J.‐D.; Meier, Andreas; Moro, A.; Platania, P.; Plaum, B.; Poli, E.; Ronden, D.; Saibene, G.; Sánchez, F.; Sauter, O.; Scherer, T.; Schreck, S.; Serikov, A.; Sozzi, C.; Spaeh, P.; Vaccaro, A.; Weinhorst, B.

doi:10.1016/j.fusengdes.2014.02.045

Cited by 28 publications

(12 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The microwave subsystem is made up of RF source, transmissions line and launcher. The design of launcher is similarly ITER EL and UL [14][15][16][17], two types of launchers are designed. In Fig.…”

Section: Ech Systemmentioning

confidence: 99%

Conceptual design of CFETR ECRH equatorial launcher and upper launcher

et al. 2019

View full text Add to dashboard Cite

The Electron Cyclotron Resonance Heating (ECRH) system of China Fusion Engineering Test Reactor (CFETR) is designed to inject 20 MW RF power into the plasma for heating and current drive (H&CD) applications. The ECRH system consists of 20 gyrotrons, the associated power supplies, the transmission lines and one launcher. In order to compare the launcher performance from equatorial and upper ports, two types of launcher are designed in this paper. In equatorial launcher (EL), twenty in-vessel transmission lines are divided into four groups. Every five gaussian beams from in-vessel transmission lines face one fixed focusing mirror and one steering mirror. All gaussian beams are injected into the plasma with optimal toroidal and poloidal angles calculated by C3PO/LUKE code. In upper launcher (UL), twenty-one transmission lines are supposed and divides into three groups. Every seven gaussian beams are injected into one fixed focusing mirrors and all twenty-one beams reflected to one common steering mirror finally. The optical transmission characteristics and the convergence information of gaussian beams are checked and optimized. The EL or UL is installed on the equatorial or upper port with a port-plug modular structure.

show abstract

Section: Ech Systemmentioning

confidence: 99%

Conceptual design of CFETR ECRH equatorial launcher and upper launcher

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In late 2011 the consortium progressed with the final design [2]; several interface changes -mainly between 2013 and 2016 -required a redesign [3] of the launchers, one key issue was the reduced geometrical boundary of the ULs. In this time also an ex-vessel component design package -being part of the first confinement system [4]was added.…”

Section: Introductionmentioning

confidence: 99%

Nearing final design of the ITER EC H&CD Upper Launcher

Strauß

Aiello

Bertizzolo

et al. 2019

Fusion Engineering and Design

Self Cite

View full text Add to dashboard Cite

The ITER ECRH system consists of 24 gyrotrons with up to 24 MW millimeter wave heating power at 170GHz, power supplies, control system, transmission lines, one Equatorial and the four Upper Launchers. With its high frequency and small beam focus the ECRH has the unique capability of driving locally current. While the Equatorial Launcher mainly acts for central heating and current profile shaping, the Upper Launchers aim on suppressing MHD instabilities, especially neoclassical tearing modes triggering plasma disruptions. The Upper Launchers inject millimeter waves through a quasi-optical section consisting of three fixed and the front steering mirror set. The eight overlapping beams have focal points optimized for suppression of the q=3/2 and q=2/1 NTMs. Several project change requests required the redesign of the Upper Launchers and the connected ex-vessel system. This redesign includes a new boundary geometry of the launchers as well as a newly designed cooling system for the Blanket Shield Module (BSM), a modified flange of the BSM to the structural main frame and a refined optical design. Additionally shield blocks with integrated in-vessel waveguides were added and the closure plate with waveguide and supply line feedthroughs was adapted. Further changes, not all caused by PCRs, include newly designed ex-vessel waveguide components with a reduced aperture and redesigned ultra low-loss CVD diamond windows. Finally several components originally foreseen as off-the-shelf components have become part of the design scope. The new launcher design status is presented with selected results on numerical design validation.

show abstract

“…The ITER ECRH system consists of an equatorial launcher and four upper launchers. These are aimed at providing local current drive to stabilize NTMs by injecting up to 20 MW of power at a frequency of 170 GHz [1]. The diamond windows are located in the port cell environment between the launcher and the transmission lines ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…[2] [3]. The tests range from standard tests for geometry control, vacuum and leakage tests up to mm-wave-transmission tests for which a dedicated measurement facility (FABRY-PEROT-resonator) is available at KIT [3] [1]. Based on the experience, which will be acquired during the prototyping phase, the final qualification for the serial windows will be defined.…”

Section: Introductionmentioning

confidence: 99%

ITER ECRH Upper Launcher diamond window – Qualification and testing of a Protection Important Component

Schreck

Aiello

Dieterle

et al. 2018

Fusion Engineering and Design

View full text Add to dashboard Cite

The diamond window is part of the ex-vessel waveguide system of the ITER ECRH Upper Launcher and consists of an ultra-low loss CVD diamond disk mounted in a system of metallic parts. On the one hand the window has to fulfil adequate transmission capability for high power mm-waves and on the other hand it serves, together with an isolation valve, as primary vacuum boundary of the ITER vacuum vessel, and has the function of tritium confinement. Therefore it is classified as Protection Important Component and high requirements for quality and safety apply. The window assembly cannot be entirely covered by codes and standards and thus an ad-hoc qualification program is required, including prototyping activities. The mm-wave transmission capability of the window, which is mainly defined by the dielectric loss of the diamond disk, has to be demonstrated as well as its structural integrity. For previous and current window prototypes, diamond disks with low dielectric losses have been chosen with a diameter of 80 mm and a thickness of 1.11 mm. This thickness satisfies the resonance condition (d = n*eff/2) for the 170 GHz beam, ensuring a high transmission, but it also needs to be validated with respect to the mechanical loads, especially the expected pressure loads. Investigations on the flexural strength of diamond disks (D = 30 mm, d = 1.11 mm) have been performed using a ring-onring setup and the results lead to an estimation of the failure behavior. In addition, pressure tests of a mock-up consisting of a diamond disk (D = 80 mm, d = 1.11 mm) brazed to a copper cuff are under examination. The dedicated test program includes cyclic tests at lower pressures and high pressure tests (up to 2 bar) allowing a simulation of the expected events. This paper will give an overview on the qualification activities for the ITER torus window with a focus on the qualification of the diamond disk and with respect to its mechanical properties. Respective parts of the test program, which need F4E and IO review and approval, will be described and first results will be presented.

show abstract

Progress of the ECRH Upper Launcher design for ITER

Cited by 28 publications

References 15 publications

Conceptual design of CFETR ECRH equatorial launcher and upper launcher

Conceptual design of CFETR ECRH equatorial launcher and upper launcher

Nearing final design of the ITER EC H&CD Upper Launcher

ITER ECRH Upper Launcher diamond window – Qualification and testing of a Protection Important Component

Contact Info

Product

Resources

About