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The Design of KSTAR FM reflectometer

The Design of KSTAR FM reflectometer. Seong-Heon Seo National Fusion Research Institute (NFRI). Contents. KSTAR Design Schedule. KSTAR Tokamak. R=1.8 m, a = 0.5 m PF and TF (B T =3.5 T) Coils = Nb 3 Sn I P = 2 MA, 5 min. Bad accessibility. First Plasma in KSTAR. B T = 1.5 T

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The Design of KSTAR FM reflectometer

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  1. The Design of KSTAR FM reflectometer Seong-Heon Seo National Fusion Research Institute (NFRI)

  2. Contents • KSTAR • Design • Schedule

  3. KSTAR Tokamak R=1.8 m, a = 0.5 m PF and TF (BT=3.5 T) Coils = Nb3Sn IP = 2 MA, 5 min Bad accessibility

  4. 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)

  5. 2nd Campaign (2009. 9) Operation Parameter • BT = 3.0 T • Plasma current ~ 300 kA, 2 s • Fundamental Harmonic ECH preionization • (84 GHz, 500 kW) New Diagnostics • Magnetic Diagnostics • Reflectometer (2 ch, Q and V Band) • ECE (32 ch) • Bolometer • X-ray Crystal Spectroscopy (XCS)

  6. Frequency Selection 2fce fx_c fce fpe

  7. Q and V Band Reflectometer

  8. Q Band (33-50 GHz) Frequency multiplier AQ-4XW-10 SpaceK Labs Mixer, MQ-U SpaceK Labs Transition TWT-28-R22R0 Militech Low pass filter FLP-22-R0000 Militech 40 dB Low pass filter LPF1-43-9 SpaceK Labs 25 dB

  9. V Band(50-75 GHz) Mixer, MV-U SpaceK Labs Low pass filter FLP-15-R0000 Militech 40 dB Low pass filter LPF1-62-9 SpaceK Labs 25 dB Transition TWT-28-R15R0 Militech Frequency multiplier AMC-15-RFH00 Militech

  10. Antenna design

  11. Antenna design

  12. Diagnostics on G-port • Interferometer (2008) • --> FIR on H-port • Reflectometer (2009) • MIR (2012) POSTEC TEXTOR 5 frequencies

  13. Interferometer in G-port

  14. Antenna of Interferometer

  15. G Port

  16. Antenna design

  17. Engineering Design

  18. DETAIL VIEW

  19. DETAIL VIEW

  20. DETAIL VIEW

  21. Frequency Selection 2fce fx_c fce fpe

  22. W and D Band (Bt = 3.5 T) Too expensive

  23. 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

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