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A multisite photometric campaign on the pre-main-sequence<i>δ</i> Scuti pulsator IP Persei
Ripepi, V.,Bernabei, S.,Marconi, M.,Palla, F.,Arellano Ferro, A.,Bonanno, A.,Ferrara, P.,Frasca, A.,Jiang, X. J.,Kim, S.-L.,Marinoni, S.,Mignemi, G.,Monteiro, M. J. P. F. G.,Oswalt, T. D.,Reegen, P.,J EDP Sciences 2006 Astronomy and astrophysics Vol.449 No.1
Launcher Study for KSTAR 5GHz LHCD System
Y. S. Bae,H. Park,J. Wilson,J. Hosea,조무현,R. Ellis,S. Bernabei,남궁원 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A 5 GHz Lower Hybrid Current Drive (LHCD) system with 2 MW is under development for the steady-state operations of the KSTAR. The present design of fully active waveguide launcher gives very good spectral directivity of more than 90 % for the phase shift of 90 degrees and a wider Nk range of 1.4 to 3.6 with a width Nk = 0.54. For the steady-state operations of the KSTAR, a Glidcop/SS sandwiched grill is proposed with consideration of heat and disruption loads. A PAM (Passive-Active Multi-junction)-type launcher is also studied for the possibility of use for the KSTAR. The PAM-type launcher provided good coupling properties even at lower edge densities in FTU 8 GHz PAM launcher tests. However, it gives a lower current drive efficiency compared with the conventional grill because of reduced directivities. The Passive/Active grill has 30 % less directivity than the Fully Active grill from the characteristic studies on the directivity and coupling. On the other hand, it gives a good coupling property with weak dependence on the phase shift between adjacent waveguides.