Design and tests of 500 kW RF windows for the ITER LHCD system

Hillairet, J.; Kim, J.H.; Faure, Nicolas; Achard, J.; Bae, Y.S.; Bernard, J. M.; Delpech, L.; Goniche, M.; Larroque, S.; Magne, R.; Marfisi, L.; Park, S.; Poli, S.; Dechambre, N.; Vulliez, K.

doi:10.1016/j.fusengdes.2015.02.065

Cited by 11 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 2011, a 5 GHz TE 10 -TE 30 mode converter has been successfully tested at low power at CEA/IRFM and the measurements are in very good agreement with the computations made by the RF modelling [32]. FIG.…”

Section: Lhcd To Sustain Steady-state Operations In Itersupporting

confidence: 66%

See 1 more Smart Citation

Recent progress on lower hybrid current drive and implications for ITER

Hillairet¹,

Goniche²,

Bae³

et al. 2013

Nucl. Fusion

Self Cite

View full text Add to dashboard Cite

The sustainment of steady-state plasmas in tokamaks requires efficient current drive systems. Lower Hybrid Current Drive (LHCD) is currently the most efficient method to generate a continuous additional off-axis toroidal plasma current as well as reduce the poloidal flux consumption during the plasma current ramp-up phase. The operation of the Tore Supra ITER-like LH launcher has demonstrated the capability to couple LH power at ITER-like power densities with very low reflected power during long pulses. In addition, the installation of eight 700kW/CW klystrons at the LH transmitter has allowed increasing the total LH power in long pulse scenarios. However, in order to achieve pure stationary LH sustained plasmas, some R&D are needed to increase the reliability of all the systems and codes, from the RF sources to the plasma scenario prediction. The CEA/IRFM is addressing some of these issues by leading a R&D program towards an ITER LH system and by the validation of an integrated LH modeling suite of codes. In 2011, the RF design of a mode converter has been validated at low power. A 500 kW/5 s RF window is currently under manufacturing and will be tested at high power in 2012 in collaboration with NFRI. All of this work aims to reduce the operational risks associated with the ITER steady-state operations.

show abstract

Section: Lhcd To Sustain Steady-state Operations In Itersupporting

confidence: 66%

“…The mode conversion efficiency has been measured by direct electricprobing and found to be more than 99% and with low reflection (-40 dB). [32]. The symbols correspond to the three measured transmission coefficients of the mode converter.…”

Section: Lhcd To Sustain Steady-state Operations In Itermentioning

confidence: 99%

Recent progress on lower hybrid current drive and implications for ITER

Hillairet¹,

Goniche²,

Bae³

et al. 2013

Nucl. Fusion

Self Cite

View full text Add to dashboard Cite

show abstract

“…For instance, Tore-Supra/WEST can use 16 klystrons at 3.7 GHz capable of delivering 9.2 MW for 1000 s. These klystrons are not, at present, using a depressed collector and their efficiency is only 37.5%. Recent developments have led to availability of 4.6 GHz systems used on Alcator C-mod and EAST and 5 GHz systems intended for KSTAR and ITER [31,32].…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

Progress and prospect of true steady state operation with RF

Jacquinot

2017

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. Operation of fusion confinement experiments in full steady state is a major challenge for the development towards fusion energy. Critical to achieving this goal is the availability of actively cooled plasma facing components and auxiliary systems withstanding the very harsh plasma environment. Equally challenging are physics issues related to achieving plasma conditions and current drive efficiency required by reactor plasmas. RF heating and current drive systems have been key instruments for obtaining the progress made until today towards steady state. They hold all the records of long pulse plasma operation both in tokamaks and in stellarators. Nevertheless much progress remains to be made in particular for integrating all the requirements necessary for maintaining in steady state the density and plasma pressure conditions of a reactor. This is an important stated aim of ITER and of devices equipped with superconducting magnets. After considering the present state of the art, this review will address the key issues which remain to be solved both in physics and technology for reaching this goal. They constitute very active subjects of research which will require much dedicated experimentation in the new generation of superconducting devices which are now in operation or becoming close to it.

show abstract

“…Which was built in 2006 and has done series physical experiments. In order to achieve steady state and high performance plasma current, a new lower hybrid current drive (LHCD) [2], [3], [4] system at a frequency of 4.6 GHz with 6MW power has been built in 2014 and been accepted successfully by Chinese National Development and Reform Commission in 2015. In order to satisfy the property of Lower Hybrid Wave (LHW) [5], [6] from 4.6GHz LHCD, the 4.6GHz/6MW LHCD High Voltage Power Supply (HVPS) based on Pulse Step Modulation (PSM) switching technology [7], [8], [9] has been built in the meantime.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Short Circuit Fault for 4.6GHz/6MW LHCD High Voltage Power Supply

Yang¹

2017

JEEE

View full text Add to dashboard Cite

4.6GHz/6MW Lower Hybrid Current Drive (LHCD) is one of plasma current heating methods for ExperimentalAdvanced Superconducting Tokamak (EAST). High Voltage Power Supply (HVPS) is the power supply subsystem of 4.6GHz/6MW LHCD system, which was designed, built and accepted successfully by Chinese National Development and Reform Commission in 2015. Then the new system has been in use for the 2015 EAST campaign. This paper presents the structure of 4.6GHz/6MW LHCD-HVPS and its transient operation state when its klystron load has short circuit fault. In order to protect the klystron and HVPS itself, the short-circuit fault and its transient process are analyzed and calculated in detail. And a three-electrode gas switch has been built to eliminate the short-circuit fault in microseconds. In addition, the effectiveness of the three-electrode gas switch has been verified by simulation and experiment result. The HVPS has been used in 4.6GHz/6MW LHCD system and it has good performance for the entire 2015 EAST campaign.

show abstract

Design and tests of 500 kW RF windows for the ITER LHCD system

Cited by 11 publications

References 18 publications

Recent progress on lower hybrid current drive and implications for ITER

Recent progress on lower hybrid current drive and implications for ITER

Progress and prospect of true steady state operation with RF

Analysis of Short Circuit Fault for 4.6GHz/6MW LHCD High Voltage Power Supply

Contact Info

Product

Resources

About