Steady state RF facility for testing ITER ICRH RF contact component

Argouarch, A.; Bamber, R.; Bernard, Jean-Michel; Delaplanche, Jean-Marc; Durodié, F.; Larroque, S.; Lecomte, P.; Lombard, G.; Hatchressian, Jean-Claude; Mollard, P.; Mouyon, D.; Pagano, M.; Patterlini, Jean-Claude; Rasio, S.; Soler, B.; Toulouse, L.; Thouvenin, D.; Verger, J.M.; Vigne, T.; Volpé, Robert

doi:10.1016/j.fusengdes.2013.03.050

Cited by 10 publications

(4 citation statements)

References 1 publication

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“…Trolleys, driver and resonator upgrade were completed after three months of manufacturing [6]. Assembly was completed and the drivers were adjusted to cope with commercial contact insertion force.…”

Section: T-resonator Commissioningmentioning

confidence: 99%

RF contact development for the ITER ICRH antenna

Argouarch¹,

Bamber²,

Beaumont³

et al. 2014

AIP Conference Proceedings

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In the framework of the Ion Cyclotron (IC) antenna design, ITER Organization requested qualification tests on sliding Radio-Frequency (RF) contacts, to verify that these contacts (quality class 1) are designed appropriately to guarantee a sufficient operational life time. These RF contacts will be integrated into the antenna structure at different locations to facilitate the assembly and decouple the different mechanical parts. This design will in addition lower the thermo-mechanical constraints and allow radial shimming of the antenna front face. As commercial contacts were not suitable for the ITER ICRH antenna operation, substantial efforts have been made on mechanical design of the new RF contact. Two prototypes have been manufactured and delivered to CEA for testing. In parallel a test stand facility (TITAN) has been refurbished to provide a way to test these RF contacts in relevant conditions (2.25kA @ 62.5MHz, vacuum pressure <10 -3 Pa, 1000s). This paper reports on main results we get during the commissioning of the test stand facility. Roadmap of the tests is also detailed with RF power tests for long shot duration (1000s) under vacuum and extensive sliding tests in order to assess the reliability of the RF contact for a relevant life time duration (specified to 10 years). A description of the RF contact is also given with the latest results on the manufacturing process (copper and gold plating and brazing, general assembly).

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Section: T-resonator Commissioningmentioning

confidence: 99%

RF contact development for the ITER ICRH antenna

Argouarch¹,

Bamber²,

Beaumont³

et al. 2014

AIP Conference Proceedings

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“…magnitude less than 3 kV/mm everywhere and voltages less than 45 kV. Additionally, the CYCLE team has specified, subject to a successful outcome of related R&D [10], currents less than 2 kA through RF contact with the highest current density (5 kA/m) between RVTL and 4PJ inner conductors. The arrows indicating the positions G min,k on FIG.…”

Section: Rf Optimization and Estimated Performancementioning

confidence: 99%

Performance assessment of the ITER ICRF antenna

Durodié¹,

Vrancken²,

Bamber

et al. 2014

AIP Conference Proceedings

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ITER's Ion Cyclotron Range of Frequencies (ICRF) system [1] comprises two antenna launchers designed by CYCLE (a consortium of European associations listed in the author affiliations above) on behalf F4E for the ITER Organisation (IO), each inserted as a Port Plug (PP) into one of ITER's Vacuum Vessel (VV) ports. Each launcher is an array of 4 toroidal by 6 poloidal RF current straps specified to couple up to 20 MW in total to the plasma in the frequency range of 40 to 55 MHz but limited to a maximum system voltage of 45 kV and limits on RF electric fields depending on their location and direction with respect to respectively the torus vacuum and the toroidal magnetic field. A crucial aspect of coupling ICRF power to plasmas is the knowledge of the plasma density profiles in the Scrape-Off Layer (SOL) and the location of the RF current straps with respect to the SOL. The launcher layout and details were optimized and its performance estimated for a worst case SOL provided by the IO. The paper summarizes the estimated performance obtained within the operational parameter space specified by IO. Aspects of the RF grounding of the whole antenna PP to the VV port and the effect of the voids between the PP and the Blanket Shielding Modules (BSM) surrounding the antenna front are discussed.

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“…On the Large Hadron Collider (LHC) accelerator, Rh coatings on Cu and CuBe (C17410) were evaluated based on their electrical performance for sliding RF contact application [8][9][10]. On ITER tokamak, RF sliding contacts [11][12][13] are being developed on which Rh is expected to be electroplated on the CuCrZr substrate to improve its wear and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Study of thermal ageing effects on Rh coating's mechanical performance upon CuCrZr substrate through modeling and experimental methods

Chen

Hillairet

Turq

et al. 2018

Vacuum

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Rhodium (Rh) coating on CuCrZr substrate is a promising material option for optical, structural and electrical applications on nuclear fusion reactors. For these applications, Rh coated CuCrZr components subject to long time of thermal ageing due to pre-treatment or normal operation condition. In this paper, both finite element method (FEM) and experimental method were applied to investigate the effects of thermal ageing on mechanical performance of Rh coating after 250°C, 500 h baking in vacuum. Based on FEM analysis, thermal stresses which concentrate at Rh coating interface is the main source of cracking, and such stresses can be minimized efficiently by introducing a 0.5 μm Au interlayer into the coating layer structure. According to thermal ageing experiments, through-thickness cracking in the Rh coating due to thermal stress releasing and voids generated at the Rh bonding interface caused by Kirkendall effect were the main micro-structure changes in the coating system. The solid-solution hardening caused by significant Cu diffusion into Rh is the dominant factor that affected the Rh coating's hardness. The existing of large amount of cracks in the Rh coating and voids at the Rh coating interface deteriorated the adhesion performance of Rh on CuCrZr substrate by 30%.

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Steady state RF facility for testing ITER ICRH RF contact component

Cited by 10 publications

References 1 publication

RF contact development for the ITER ICRH antenna

RF contact development for the ITER ICRH antenna

Performance assessment of the ITER ICRF antenna

Study of thermal ageing effects on Rh coating's mechanical performance upon CuCrZr substrate through modeling and experimental methods

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