The layout of KSTAR reflectometer. The inside view of the installed antenna array is shown in the left side.
The directivity of a long horn antenna (a) in E-plane and (b) in H-plane.
The poloidal layout of antennas. The lower orange horn is a transmitting antenna and the upper one is a receiving antenna. The angle between two antennas is 2.8°; a is the minor radius, R entrance (= 0.824 m) is the position of the antenna entrance. R apex (= 1.161 m) is the antenna phase center.
The circuit diagram of Q band reflectometer.
The circuit diagram of VCO driver. The single supply op-amp circuit converts the output voltage of AWG to the input voltage range of VCO.
(a) The circuit diagram of 3 MHz high pass filter. (b) The designed characteristics of filter.
Mica vacuum window. (a) Vacuum seal with gold gasket. 1 – antenna, 2 – wedge shaped waveguide, 3 – 10″ CF flange, 4 – vacuum window, and 5 – waveguide. (b) The measurement of helium leak rate. The vacuum window is wrapped in a plastic bag for vacuum test in hood method. Helium gas is sprayed at time zero. (c) The microwave transmittance.
The microwave transmittance of the filter bank of (a) W band, (b) V band, and (c) Q band. (d) The transmittance of Q band low pass filter.
(a) Electric insulator made with Mylar sheet. (b) The microwave transmittance of the 0.3 mm and 0.9 mm thick Mylar electric insulators.
The group delay of the microwave launched into vacuum. The microwave frequency is linearly swept.
Phase measurement by wavelet transform.
(a) The mixer output simulated for the plasma density profile and B 0 = 2 T. n 0 is the peak density, a is the plasma radius. (b) Experimental measurement of mixer output.
Plasma density profile (shot No. 8137).
Comparison of Dα emission and the plasma density contour measured by reflectometer (shot No. 7283).
Characteristics of the antenna.
Article metrics loading...
Full text loading...