Fundamental X-mode Electron Cyclotron Current Drive using Remote-Steering Symmetric Direction Antenna at Larger Steering Angles H. Idei 1, K. Hanada 1,

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Fundamental X-mode Electron Cyclotron Current Drive using Remote-Steering Symmetric Direction Antenna at Larger Steering Angles H. Idei 1, K. Hanada 1, H. Zushi 1, K. Ohkubo 2, M. Hasegawa 1, S. Kubo 2, K. N. Sato 1, K. Nakamura 1, M. Sakamoto 1, A. Iyomasa 1, S. Kawasaki 1, H. Nakashima 1, A.Higashijima 1, T. Notake 3, T.Shimozuma 2, S. Ito 2, H. Hoshika 4, N. Maezono 4, S. Nishi 4, K. Nakashima 4 and TRIAM Experimental. Group 1 1 Research Institute for Applied Mechanics, Kyushu University, Kasuga, , Japan 2 National Institute for Fusion Science, Toki, , Japan 3 Faculty of Engineering, Nagoya University, Nagoya, , Japan 4 Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, , Japan The 20th IAEA Conference, PD/1-2 H. Idei et al.

Outline TRIAM, Advanced Fusion Research Center 1. Introduction Remote Steering Antenna relevant to ITER Application New Hardware on ECH/ECCD after the 19th IAEA in TRIAM-1M 2. Symmetric Direction Remote Steering Antenna with Larger Steering Angles Output Beam Pattern ---- Gaussian Content ---- Output Steering Angle [ based on Intensity & Phase Measurements ] Transmission Efficiency 3. ECH / ECCD Experiments on the TRIAM-1M tokamak Mode Purity Control Experiment O-mode Experiment X-mode Experiment 4. Summary The 20th IAEA Conference, PD/1-2 H. Idei et al.

Remote Steering Antenna with Symmetric- and Asymmetric- Angles TRIAM, Advanced Fusion Research Center f : 170GHz a : 31.75mm Transmission efficiency = P out / P in : perpendicular field to steering planeE (K.Ohkubo) Dependence of Transmission Efficiency on  and L [imaging property in fundamental mode] L[m]  [deg.] L[m] Extended Steering Capability Asymmetric [ITER] Symmetric [TRIAM] The 20th IAEA Conference, PD/1-2 H. Idei et al.

ECH/ECCD System in TRIAM-1M tokamak TRIAM, Advanced Fusion Research Center Operating Frequency : 170GHz : Magnetic Field ~ 6T. Heating Scenario : Fundamental O/X-mode from Low Field side ITER Condition N //, v // Water Dummy Load Gyrotron MOU for Antenna MOU Gate Valve Brick Dummy Load Polarizer Remote Steering Antenna [200kW:5s] After 19th IAEA Steering Angle  in B, Ip The 20th IAEA Conference, PD/1-2 H. Idei et al.

Antenna System for the TRIAM-1M tokamak TRIAM, Advanced Fusion Research Center Gate Valve Antenna Differential Pumping Port Evacuated Waveguide Line Matching Optics Unit for Antenna M1 M2 M3 M4 Square Corrugated Waveguide Antenna ( Remote Steering Antenna ) Remote Steering Antenna The 20th IAEA Conference, PD/1-2 H. Idei et al.

TRIAM, Advanced Fusion Research Center The phase rapidly changes near the side lobe, therefore, the side lobe part is spread out from the main lobe along the propagation. [ Ey Component: 15 degree steering case ] Output Beam Analysis [ Output pattern & Steering Angle ] Output Beam is analyzed using Moment Method to evaluate the beam center offset and the steering angle, and using Matching Coefficient to evaluate Gaussian Content. The phase profile is flat near the beam center.The beam propagates along the measuring z-axis. x y z 15 degrees The 20th IAEA Conference, PD/1-2 H. Idei et al.

TRIAM, Advanced Fusion Research Center Analysis by Moment Method & Matching Coefficient The n-th moment in the x direction is defined with the amplitude distribution A(x, y) as, The dependence of the beam center position on the propagating position z can be written as,,where k and  are the wave number and the phase distribution. Beam Center First moment = 8mm Propagating slope Steering Accuracy : -0.3 degree [ in main lobe ] The complex amplitudes f, g are deduced from the intensity and phase distributions measured and calculated with the fitted w x and R x in Gaussian Optics. The Gaussian content is evaluated as 0.85 for the output beam. f, g: Complex amplitude Ae  The 20th IAEA Conference, PD/1-2 H. Idei et al.

TRIAM, Advanced Fusion Research Center Transmission Efficiency To evaluate the efficiency, the intensity patterns are integrated in the x-y plane at the low power test. A dummy load is connected the enterance and the end of the antenna at the high power test. Dummy load The fractions containing the higher-order Hermite Gaussian modes [HG m0 modes (m=1-60)] in the imaging property calculation are consistent with those in the measurement. Transmission Efficiency Trans. eff. : ~0.95 x y z The 20th IAEA Conference, PD/1-2 H. Idei et al. Thermal drift of IF Amp.

ECH / ECCD Experiments using Remote Steering Antenna on the TRIAM-1M tokamak 1. Mode Purity Control Experiment to optimize and confirm the incident polarization state O-mode Experiment 3. X-mode Experiment The 20th IAEA Conference, PD/1-2 H. Idei et al.

Halo TRIAM, Advanced Fusion Research Center Mode Purity Control Experiment in Superposition to LHCD Plasma The R cutoff radius R cut is 0.870m. _The plasma center and the bulk resonance radii Raxis and Rres are 0.84m. The maximum resonance radius due to the Doppler shift effect R D is 0.865m. No coupling area for incident X- mode component It is noted that it is ideal to confirm to the O-mode coupling for the incident beam. R Cutoff The 20th IAEA Conference, PD/1-2 H. Idei et al. N // ~0.22 Rcut RDRD low field side n e = 0.8 x m -3 in the target LHCD plasma Rcut >R D

Halo TRIAM, Advanced Fusion Research Center Mode Purity Control Experiment The increase of the current comes from a coupling of Electron Cyclotron Wave to the LHCD plasma. The 20th IAEA Conference, PD/1-2 H. Idei et al. LH 60kW ~30kA ~0.8x1019m-3 Raxis ECH/ECCD 100kW N // ~0.22 Purity 1.0 (center) IpIp nene SX HX OII

Halo TRIAM, Advanced Fusion Research Center Steering Angle Scan in the O-mode Experiment The heating effect in an improvement of the LHCD efficiency is dominant. The increased current  I p in the perpendicular injection is 18.3 kA. The current drive efficiency  ECHLH  = n e I p R/(P ECH P LH ) in the superposition is evaluated as x A/Wm 2. That is comparable to  LH of x A/Wm 2 in the target LHCD plasma. The 20th IAEA Conference, PD/1-2 H. Idei et al.

TRIAM, Advanced Fusion Research Center Peaked  I HX Profile in the Co- Steering Case at the O-mode Injection The peaked  I HX comes from the improvement of the LHCD efficiency due to increased electron temperature and density and a direct coupling into the forward fast electrons at between R=R res and R=R D. In the co- (+16 degrees) and counter- (-16 degrees) steering cases, the forward (v // >0) and backward (v // <0) fast electrons can be coupled with the incident wave between R D and Rres before the beam is absorbed by the bulk electrons. The 20th IAEA Conference, PD/1-2 H. Idei et al.

Halo TRIAM, Advanced Fusion Research Center X-mode Experiment in the Doppler-shifted ECCD in LHCD plasma The parallel refractive index N // is 0.32 The Doppler resonance R D is 0.868m. The R cutoff position Rcut is 0.860m. There is a Current Drive (CD) window between R D and R cut, where the X mode can be absorbed. The 20th IAEA Conference, PD/1-2 H. Idei et al. At same n e =0.95 x m -3 There are clear differences in the both steering cases in the increased current and the HXR intensity. Doppler Up-shifted ECCD for X-mode RDRD Rres Rcut Raxis Off-axis

Halo TRIAM, Advanced Fusion Research Center The hollow  I HX profile is observed with a peak at the CD window. It indicates the incident X- mode wave is coupled around R=0.86m. The 20th IAEA Conference, PD/1-2 H. Idei et al. The possible energy range to be resonant with the incident X-mode at R=0.86m is evaluated as 10-60keV. The resonant energy range for the EC wave is consistent with that of the forward fast electrons by the LH wave. ECCD in X-mode Coupling to Fast Electrons in LHCD plasma  I p is due to the ECCD effect on a coupling for the forward fast electrons in the LHCD plasma.

Summary (I) The symmetric direction remote steering antenna with larger steering angle has been developed for the ECH/ECCD experiments on the TRIAM-1M tokamak. The steering angles of 8-19 degrees are available, in addition to that near 0 degree. The output beam from the antenna is the well-defined Gaussian beam with a correct steering angle. The Gaussian content and the steering angle accuracy are 0.85 and –0.3 degrees. The transmission efficiency is evaluated as 0.95 in the high power test. In the O-mode experiments, the dependence of the increased current on the steering angle is observed. However, the heating effect in an improvement of the LHCD efficiency, compared to the ECCD effect, is dominant. The 20th IAEA Conference, PD/1-2 H. Idei et al.

In the X-mode experiment, there are clear differences in  I p and  I HX in the larger co- and counter- steering cases due to the ECCD effect on the coupling for the forward fast electrons in the energy range of 10-60keV at the medium density (1x10 19 m -3 ). The hollow profile of the HXR intensity increased by ECH/ECCD is observed at the CD window. The resonant energy range is consistent with that of fast electron generated by the LH wave. _The CD efficiency is roughly evaluated from the difference of the increased current (~ 5kA) between the co- and counter- steering cases as ten times smaller than that in LHCD. Summary (II) This is a first application of the remote steering antenna to the ECH/ECCD experiment. The 20th IAEA Conference, PD/1-2 H. Idei et al. The energy range of fast electrons coupled with EC wave is equivalent to that of resonant electrons for ECCD in high electron temperature plasmas at ITER.