Articulated Inspection Arm
  Long pulse H-mode operation
  ICRH Antenna

Long pulse H-mode operation

It is proposed that the main topic of cooperation is focused on the theme " Long pulse H-mode operation" in EAST. IRFM will participate in the following topics:

i) Preparation of the scenarios using METIS, CRONOS and specific RF codes in order to define the operational domain for EAST operation with the power capabilities foreseen in 2014.

ii) Participation in long pulse H-mode experiments, with particular emphasis on the optimization of the RF coupling in H-mode, both ICRH and LHCD.

iii) Physics support to the optimization of the long pulse H-mode scenario, such as optimization of LH current drive efficiency and synergy between LHCD and ECRH.

iv) Wall monitoring during long pulse H-mode operation.


IRFM will perform modeling with the METIS code to find the operational domain for H-mode operation in EAST, taking into account the LHCD power, ICRH power and NBI power available. The requirements in terms of power and plasma parameters for achieving a full non-inductive scenario (VLoop = 0) will be identified. CRONOS modeling will be performed on selected cases.

J. Qian, S. Ding, Q. Ren, G. Li, W. Guo,...

  • METIS will also be used for designing and testing feed-back controllers.

  • The ICRH scenario will be optimized by performing simulations of localization of the resonance layers of the minority species.

  • Work to be performed by IRFM prior the EAST experimental campaign.


  • IRFM will participate in the experiments aiming at "Long pulse H-mode operation", with particular emphasis on the optimization of RF coupling in H-mode.

Gong, Qian

  • The RF coupling experiments will focus on the optimization of plasma density, plasma-antenna gap, gas injection locations and minority concentration, in order to maximize the coupled ICRH and LHCD power, while respecting the operational domain as identified in 1.i).

B. Ding, M. Li

  • An experiment aiming at identifying the role of B4C-coating on the ICRH Faraday screen will be performed using the I-port antenna.

X. Zhang, C. Qin

  • IRFM will participate in analysis and modeling of ICRH experiments using the available codes at IRFM, such as SSWICH for RF sheath rectification and EVE for ICRH power absorption.

  • Possible IRFM participants, either at ASIPP or as support at IRFM: Laurent Colas, Rmi Dumont, Annika Ekedahl, Marc Goniche, Walid Helou, Julien Hillairet, Xavier Litaudon, Lingfeng Lu.


  • IRFM will participate in specific physics experiments that will allow optimizing the performance of the "Long pulse H-mode scenario", such as the role of the LH source frequency (2.45 GHz vs 4.6 GHz) on the LH current drive efficiency. Modeling with the IRFM code, LUKE, will be made in support to the experiments.

  • Synergy between LHCD and ECRH may give an additional tool to improve the LH current drive efficiency. Modeling will be performed in 2014 in preparation for future experiments. IRFM can host a person from ASIPP to perform LUKE simulations of LHCD+ECRH synergy. (B. Ding, M. Li)

  • IRFM will participate in the start-up of the ECRH system on EAST.(Wei Wei, Qian)

  • In addition to the above topics, IRFM will participate in the operation of the 2D X-crystal spectrometer.(Bo Lu)

  • Possible IRFM participants, either at ASIPP or as support at IRFM: Gilles Colledani, Joan Decker, Lena Delpech, Annika Ekedahl, Christel Fenzi, Gerardo Giruzzi, Marc Goniche, Frederic Imbeaux, Didier Mazon, Yves Peysson, Xiao-Lan Zou.


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