TJ-II:Electron Cyclotron Resonant Heating: Difference between revisions

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In the TJ-II stellarator, the plasmas are created and heated by two 53.2 GHz gyrotrons, each of them delivering 300 kW. The power is transmitted to the plasma by two quasi-optical transmission lines (QTL1 and QTL2).  
[[File:Beamlines_1.png|300px|thumb|right|Top view of the TJ-II plasma and the injection locations of the two beam lines]]
[[File:Beamlines_2.png|500px|thumb|right|Cross sections for the two beam lines, showing the steerable mirrors]]
In the [[TJ-II]] stellarator, the plasmas are created and heated by two 53.2 GHz gyrotrons, each of them delivering up to 300 kW in the 2<sup>nd</sup> harmonic, with X-mode polarisation.
<ref>F. Castejón and J. Guasp, ''Microwave injection in heliac device TJ-II'', [[doi:10.1088/0741-3335/30/7/008|Plasma Phys. Control. Fusion '''30''' (1988) 907-911]]</ref>
The power is transmitted to the plasma by two quasi-optical transmission lines (QTL1 and QTL2).
<ref>A. Fernández et al, ''Quasioptical Transmission Lines for ECRH at TJ-II Stellarator'', [[doi:10.1023/A:1006720117520|International Journal of Infrared and Millimeter Waves '''21''', 12 (2000) 1945-1957]]</ref>
The power is delivered to the [[TJ-II:Sectors|sector]] B3 (for QTL1) and A6 (for QTL2).
The power is delivered to the [[TJ-II:Sectors|sector]] B3 (for QTL1) and A6 (for QTL2).
The last mirror of each line is a steerable mirror located inside the vacuum vessel, which allows for perpendicular and oblique injection.  
The last mirror of each line is a steerable mirror located inside the [[TJ-II:Vacuum system|vacuum vessel]], which allows for perpendicular and oblique injection.  
<ref>[http://dx.doi.org/10.1109/ICIMW.2000.892950 A. Fernandez et al, ''Design of the upgraded TJ-II quasi-optical transmission line'', Conference Digest, 25<sup>th</sup> International Conference on Infrared and Millimeter Waves (2000) 91 - 92]</ref>
<ref>A. Fernández et al, ''Design of the upgraded TJ-II quasi-optical transmission line'', [[doi:10.1109/ICIMW.2000.892950|Conference Digest, 25<sup>th</sup> International Conference on Infrared and Millimeter Waves (2000) 91 - 92]]</ref>
<ref>[http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=4516800&isnumber=4516365 A. Fernandez et al, ''EC waves polarization control in the TJ-II stellarator'', Joint 32<sup>nd</sup> International Conference on Infrared and Millimeter Waves( 2007)]</ref>
<ref>A. Fernandez et al, ''EC waves polarization control in the TJ-II stellarator'', [http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=4516800&isnumber=4516365 Joint 32<sup>nd</sup> International Conference on Infrared and Millimeter Waves (2007)]</ref>
The gyrotron frequency is f = 53.2 GHz, tuned to the 2<sup>nd</sup> harmonic, X-mode polarisation.
<ref>A. Fernández et al, ''Gyrotron Radiation Affected by a Controlled Modulated Reflector: High Power Experiment'', [[doi:10.1007/s10762-007-9256-2|International Journal of Infrared and Millimeter Waves '''28''', 9 (2007) 705-711]]</ref>
The total power that can be delivered to the plasma is ''P<sub>ECRH</sub>'' &le; 600 kW.
<ref>A. Fernández et al, ''Performance of the TJ-II ECRH system with the new −80 kV 50 A high voltage power supply'', [[doi:10.1016/j.fusengdes.2008.12.092|Fusion Engineering and Design '''84''', Issues 2-6 (2009) 772-775]]</ref>
The gyrotrons can be modulated.
The gyrotrons can be modulated for perturbative transport experiments <ref>S. Eguilior et al, ''Heat wave experiments on TJ-II flexible heliac'', [[doi:10.1088/0741-3335/45/2/303|Plasma Phys. Control. Fusion '''45''' (2003) 105–120]]</ref> and can be used to drive current.
<ref>V. Tribaldos et al, ''Electron cyclotron heating and current drive in the TJ-II stellarator'', [[doi:10.1088/0741-3335/40/12/010|Plasma Phys. Control. Fusion '''40''' (1998) 2113]]</ref>
 
== Signal names in the [[TJ-II:Shot database|TJ-II database]] ==
* GR, GR2: gyrotrons 1 and 2
* ECA1...4: sniffer probes


== References ==
== References ==
<references />
<references />

Latest revision as of 08:43, 17 July 2024

Top view of the TJ-II plasma and the injection locations of the two beam lines
Cross sections for the two beam lines, showing the steerable mirrors

In the TJ-II stellarator, the plasmas are created and heated by two 53.2 GHz gyrotrons, each of them delivering up to 300 kW in the 2nd harmonic, with X-mode polarisation. [1] The power is transmitted to the plasma by two quasi-optical transmission lines (QTL1 and QTL2). [2] The power is delivered to the sector B3 (for QTL1) and A6 (for QTL2). The last mirror of each line is a steerable mirror located inside the vacuum vessel, which allows for perpendicular and oblique injection. [3] [4] [5] [6] The gyrotrons can be modulated for perturbative transport experiments [7] and can be used to drive current. [8]

Signal names in the TJ-II database

  • GR, GR2: gyrotrons 1 and 2
  • ECA1...4: sniffer probes

References

  1. ↑ F. Castejón and J. Guasp, Microwave injection in heliac device TJ-II, Plasma Phys. Control. Fusion 30 (1988) 907-911
  2. ↑ A. Fernández et al, Quasioptical Transmission Lines for ECRH at TJ-II Stellarator, International Journal of Infrared and Millimeter Waves 21, 12 (2000) 1945-1957
  3. ↑ A. Fernández et al, Design of the upgraded TJ-II quasi-optical transmission line, Conference Digest, 25th International Conference on Infrared and Millimeter Waves (2000) 91 - 92
  4. ↑ A. Fernandez et al, EC waves polarization control in the TJ-II stellarator, Joint 32nd International Conference on Infrared and Millimeter Waves (2007)
  5. ↑ A. Fernández et al, Gyrotron Radiation Affected by a Controlled Modulated Reflector: High Power Experiment, International Journal of Infrared and Millimeter Waves 28, 9 (2007) 705-711
  6. ↑ A. Fernández et al, Performance of the TJ-II ECRH system with the new −80 kV 50 A high voltage power supply, Fusion Engineering and Design 84, Issues 2-6 (2009) 772-775
  7. ↑ S. Eguilior et al, Heat wave experiments on TJ-II flexible heliac, Plasma Phys. Control. Fusion 45 (2003) 105–120
  8. ↑ V. Tribaldos et al, Electron cyclotron heating and current drive in the TJ-II stellarator, Plasma Phys. Control. Fusion 40 (1998) 2113
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