Ion Cyclotron Range of Frequencies (ICRF) Heating System
T. Seki, K. Saito, H. Kasahara, R. Seki, S. Kamio, G. Nomura, M. Kanda
e-mail: seki.tetsuo@nifs.ac.jp

1.

Objective

Launch fast waves (Ion Cyclotron Range of Frequencies (ICRF) waves) to heat plasma particles bywave-particle interaction.

2. Apparatus
2.1. RF amplifier (Heating Device Hall)- Frequency: 25-100 MHz- Pulse length and power:

1.3 MW x 6, 5 sec. (38.47 MHz)
0.8 MW x 6, CW (38.47 MHz)2.2. Impedance matching device (LHD Hall)- Double liquid stub tuner system for 4.5U,L ICRF antenna- Triple liquid stub tuner system for 3.5U,L ICRF antenna

2.3. Antenna- HAS (Hand-Shake type) antenna: toroidal double strap located at 3.5U,L- FAIT (Field-Aligned Impedance Transforming) antenna: poloidal double strap located at 4.5U,L- Excited wave: fast wave

3. Operation
3.1. Minority heating- Deuterium or helium majority and hydrogen minority plasma in Rax = 3.6 m and Bt = 2.75 T and wavefrequency = 38.47 MHz- Minority hydrogen ions are accelerated at fundamental ion cyclotron resonance layer.

3.2. Second harmonic heating- Deuterium plasma in Rax = 3.6 m and Bt = 2.75 T and wave frequency = 38.47 MHz- Deuterium ions are accelerated at second harmonic ion cyclotron resonance layer.

3.3. Other heating mode
- High harmonic heating is possible by change of magnetic field strength.

HAS antenna
at 3.5U,LFAIT antenna
at 4.5U,LFig. 1. Location of antennas

4.

Available data

4.1.

Kaiseki-data server

ichpw: input power P(=Pfwd-Pref) [MW]time, HAS_3.5U, HAS_3.5L, FAIT_4.5U, FAIT_4.5L, Total ICRF power
ICRF-DC35: analyzed data about HAS antenna at 3.5U,Ltime, P(U) [MW], Vmax(U) [kVp], R(U) [ohm], Delta_L(U) [m], P(L) [MW], Vmax(L) [kVp], R(L) [ohm],
Delta_L(L) [m], Phase [deg]ICRF-DC45: analyzed data about FAIT antenna at 4.5U,Ltime, P(U) [MW], Vmax(U) [kVp], R(U) [ohm], Delta_L(U) [m], P(L) [MW], Vmax(L) [kVp], R(L) [ohm],
Delta_L(L) [m], Phase [deg]4.2. LABCOMICHVOLT: raw data of forward and reflected power, and voltage of transmission line
Antenna: data No.
3.5U: 66, 67, 12

3.5L: 68, 69, 13
4.5U: 4, 5, 16
4.5L: 6, 7, 17
ICHPXI: raw data of forward and reflected power, and voltage of transmission line
Antenna: data No.
3.5U: 18, 19, 2
3.5L: 20, 21, 5
4.5U: 6, 7, 14
4.5L: 9, 10, 15
ICRF-DC35: raw data of the directional coupler at the impedance matching tuner at 3.5U,Lch #1: time to trigger by internal timer
2: forward voltage of 3.5U
3: start time of ch 2
4: mix of forward and reflected voltage of 3.5U
5: start time of ch4
6: forward voltage of 3.5L
7: start time of ch 6
8: mix of forward and reflected voltage of 3.5L
9: start time of ch8
ICRF-DC45: raw data of the directional coupler at the impedance matching tuner at 4.5U,Lch #1: time to trigger by internal timer
2: forward voltage of 4.5U
3: start time of ch 2
4: mix of forward and reflected voltage of 4.5U
5: start time of ch4
6: forward voltage of 4.5L
7: start time of ch 6
8: mix of forward and reflected voltage of 4.5L
9: start time of ch8

5.

Remarks

References[1] T. Mutoh, et al., Fusion Engineering and Design 26 (1995) 387.

[2] R. Kumazawa, et al., Review of Scientific Instruments 70 (1999) 2665.
[3] T. Seki, et al., Fusion Science and Technology 40 (2000) 253.
[3] H. Kasahara, et al., Plasma and Fusion Research 5 (2010) S2090.
[3] K. Saito, et al., Fusion Engineering and Design 96-97 (2015) 583.