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Preliminary results on LH PAM antenna for Iter

Preliminary results on LH PAM antenna for Iter. Julien Hillairet. CEA. IRFM. F-13108 Saint-Paul-lez-Durance. France HCD08-03-01 EFDA Task Meeting in Frascati. 31 March-1 April 2009. LH PAM Antenna dimensions. Taken from DDD2001 (Ph.Bibet & F.Mirizzi) ‏ Active waveguide:

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Preliminary results on LH PAM antenna for Iter

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  1. Preliminary results on LH PAM antenna for Iter Julien Hillairet CEA. IRFM. F-13108 Saint-Paul-lez-Durance. France HCD08-03-01 EFDA Task Meeting in Frascati. 31 March-1 April 2009

  2. LH PAM Antenna dimensions • Taken from DDD2001 (Ph.Bibet & F.Mirizzi)‏ • Active waveguide: • Height: 56 mm (or 58 mm depending on ref.)‏ • Width: 9.25 mm • Passive waveguide: • Width: 7.25 mm • Septum between waveguide : 3 mm 3 PAM modules view from ALOHA (8*3=24 actives wg, 25 passive wg)‏

  3. HFSS RF model of a module • HFSS Simulation of a PAM module Preliminary design: structure not optimized

  4. ALOHA simulations (1)‏ • 3-Modules antenna spectrum Main peak: n//0=2 for 0° phasing between modules

  5. ALOHA simulations (2)‏ • Peak n// (cross) and directivity (plain) vs phasing between modules ne0= 5e17 m-3λn0= 2 mm Best directivityfor n//0~1.975 Directivity Flexibility (DDir/Dir<10%): n//0 in [1.9,2.05]

  6. ALOHA simulations (3)‏ • Reflexion coefficient vs electron density ne0 8 round trips in the MJ ensures low RC in a wide range of density

  7. ALOHA simulations (3)‏ • Directivity vs electron density at the mouth ne0v ELMs (transient) nco 3×nco Low directivity for n > 3×nco

  8. ALOHA simulations (4)‏ • Directivity vs density gradient (for ne0=5e17 m-3)‏

  9. Future work (for next working meeting) • Optimize the design with chosen value of N//0 (1.9?) (bi-junctions, phase shifters, bpassive/bactive), to be discussed • Compute ILH with real spectra (N//0 =1.8 – 2.0) • Increase Flexibility => 4Active +4Passive Module : N//0 =1.75-2.05 (with DDir/Dir<10%) • Design of a FAM

  10. Directivity 0,8 0,7 0,6 0,5 power directiviy 0,4 0,3 0,2 ncut-off 10 x ncut-off 0,1 0 0,00E+00 5,00E+11 1,00E+12 1,50E+12 2,00E+12 2,50E+12 3,00E+12 3,50E+12 ne (cm-3) DDD2001 PAM ITER FEAT Ln=1 cm j=0 24active WG/25passive WG HCD-08-03-01 (2009) ALOHA modeling 24active WG/25passive WG Wrong SWAN calculation

  11. Average RC 5GHz ITER – DDD2001 3.5 ncut-off 10xncut-off 3.0 2.5 Average RC (%) 2.0 1.5 1.0 SWAN 0.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 ne (1018 m-3) DDD2001 PAM ITER FEAT Ln=1 cm j=0 24active WG/25passive WG HCD-08-03-01 (2009) ALOHA modeling 24active WG/25passive WG

  12. d d Cooling of a FAM could be not more difficult than a PAM FAM: front view PAM: top view l0/4 < d  a/2< l0/2 d  dpassive  lg/4 17.5mm (a=58mm) 5GHz 15mm

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