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The Design of KSTAR FM reflectometer
Seong-Heon SeoNational Fusion Research
Institute (NFRI)
Contents
• KSTAR
• Design
• Schedule
KSTAR Tokamak
R=1.8 m, a = 0.5 mPF and TF (BT=3.5 T) Coils = Nb3SnIP = 2 MA, 5 min
Bad accessibility
First Plasma in KSTAR
• BT = 1.5 T• 2nd Harmonic ECH preionization (84 GHz, 300 kW)• Plasma current ~ 100 kA, 0.7 s
• Magnetic Diagnostics• Interferometer (1 ch)• ECE (8 ch)• Hα, Filter Scope• CCD Camera (1 kHz)
2nd Campaign (2009. 9)
• BT = 3.0 T• Plasma current ~ 300 kA, 2 s• Fundamental Harmonic ECH preionization (84 GHz, 500 kW)
• Magnetic Diagnostics• Reflectometer (2 ch, Q and V Band)• ECE (32 ch)• Bolometer• X-ray Crystal Spectroscopy (XCS)
Operation Parameter
New Diagnostics
Frequency Selection
Plasma typeLow field
High fieldCase I Case II
n0 (x1014 cm-3) 0.2 0.71 1.68B0 (T) 1.5 3.5 3.5
fx_cfce
2fce
fpe
Plasma type
Low field High fieldCase I Case II
Wave mode O X O X O XFrequency range of probing
signals [GHz]0-33 33-66 0-75 75-150 0-118 77-153
Max. accessible position r of cutoff layer (cm)
217 183 180 143 180 212
Q and V Band Reflectometer
Q Band (33-50 GHz)
Mixer, MQ-USpaceK Labs
Low pass filterLPF1-43-9SpaceK Labs25 dB
Low pass filterFLP-22-R0000Militech40 dB
TransitionTWT-28-R22R0Militech
Frequency multiplierAQ-4XW-10SpaceK Labs
V Band (50-75 GHz)Mixer, MV-USpaceK Labs
Low pass filterLPF1-62-9SpaceK Labs25 dB
Low pass filterFLP-15-R0000Militech40 dB
TransitionTWT-28-R15R0Militech
Frequency multiplierAMC-15-RFH00Militech
Antenna design
Antenna design
Diagnostics on G-port
1. Interferometer (2008)--> FIR on H-port
2. Reflectometer (2009)
3. MIR (2012) POSTEC TEXTOR 5 frequencies
Interferometer in G-port
Antenna of Interferometer
G Port
Antenna design
Engineering Design
DETAIL VIEW
DETAIL VIEW
DETAIL VIEW
Frequency Selection
Plasma typeLow field
High fieldCase I Case II
n0 (x1014 cm-3) 0.2 0.71 1.68B0 (T) 1.5 3.5 3.5
fx_cfce
2fce
fpe
Plasma type
Low field High fieldCase I Case II
Wave mode O X O X O XFrequency range of probing
signals [GHz]0-33 33-66 0-75 75-150 0-118 77-153
Max. accessible position r of cutoff layer (cm)
217 183 180 143 180 212
W and D Band (Bt = 3.5 T)
Too expensive
Summary and Schedule
2nd campaign:
- Q (33-50 GHz) and V (50-75 GHz) Band in X-mode- BT = 1.5 T
3rd campaign:
- BT = 3.0 T- W Band (75-110 GHz) in X-mode
D Band Q and V Band in O-mode
Square waveguide+ Twister
Cross Polarization