Abstract
The first Lower Hybrid (LH) experiments were carried out with a Passive-Active Multijunction (PAM) launcher in H-mode plasmas. The experiments were performed on the HL-2A tokamak with the new 3.7 GHz LHCD system, installed and tested by SWIP in collaboration with CEA/RFM. The ELMs and local gas impact on LH power coupling was studied in the experiments. The coupled LH power in HL-2A was 200-500kW at large gap at the first experiments and reaches 900 kW now in H-mode, while it reaches 1MW in L-mode. The LH experiments on HL-2A show that the PAM launcher is a viable concept for high performance scenarios. The LH power can be coupled at large plasma-launcher gap, and assist in triggering and sustaining H-modes. Finally, an overview of the RF heating systems for the tokamak HL-2M is given. HL-2M will dispose of a 4 MW LH system and a 8 MW ECRH system, both of which are currently under installation at SWIP.
Highlights
Lower hybrid current drive (LHCD) is a well known method of non-inductive current drive in tokamaks, which has been used successfully in tokamaks around the world since the early 1980s
As a part of the 3.7 GHz LHCD system constructed on HL-2A tokamak, the third passive-active multijunction (PAM) launcher is developed and applied, making it possible to carry out Lower Hybrid (LH) experiments in H-mode plasmas by PAM antenna
A new 3.7 GHz LHCD system was developed and applied on HL-2A, in which a new passive-active multijunction (PAM) launcher was successfully used in H-mode experiments for the first time
Summary
Lower hybrid current drive (LHCD) is a well known method of non-inductive current drive in tokamaks, which has been used successfully in tokamaks around the world since the early 1980s. A PAM launcher was designed and constructed for Tore Supra [6], demonstrating long pulse operation at high coupled power (2.7 MW, 80 s) and ITER-relevant power density [7]. The PAM experiments in FTU and Tore Supra have shown excellent results of power handling and coupling at large plasma-launcher distances, making it an attractive launcher design for. This has so far only been demonstrated in L-mode plasmas. As a part of the 3.7 GHz LHCD system constructed on HL-2A tokamak, the third PAM launcher is developed and applied, making it possible to carry out LH experiments in H-mode plasmas by PAM antenna. Eight transmission lines (~ 20 m each) connect the klystrons to the launcher
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