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TD26 for Dog-Leg Expt

Faking beam loading. TD26 for Dog-Leg Expt. Vasim Khan & Igor Syratchev 23-05-2012. CLIC_G Summary:- Gradient in 26 regular cells. 5.5. 243.2. 231.6. 4.4. P in load = 60.4 MW. P out oad = 10.1 MW. Eff = 27.7 %. t r = 22.4 ns, t f = 62.6 ns, t p = 240.5 ns. 119.2. 115.8.

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TD26 for Dog-Leg Expt

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  1. Faking beam loading TD26 forDog-Leg Expt Vasim Khan & Igor Syratchev 23-05-2012

  2. CLIC_G Summary:- Gradient in 26 regular cells 5.5 243.2 231.6 4.4 Pinload = 60.4 MW Poutoad = 10.1 MW Eff = 27.7 % tr = 22.4 ns, tf = 62.6 ns, tp = 240.5 ns 119.2 115.8 <Eacc> 100 MV/m 60.4 39.0 49.7 26.5

  3. Unloaded 119.2 115.8 Beam loaded 73.75

  4. Contemplating ……… • Field distribution in the absence of beam is almost flat (<Eacc>=119.5) • In the presence of beam the distribution tapers by 36% (<Eacc>=100) • Comparing breakdowns in, with and without beam conditions may not be a good idea! • Can we make both the profiles similar? • May be by changing the geometry of the cells (except iris parameters) • By keeping the first cell fixed, if we gradually degrade the RF properties along the structure (by the same amount as beam loading), then the unloaded field in this structure will also get tapered • I know it is difficult • Let’s try and play with numbers!

  5. qf13=0.95;qf26=0.9; rqf13=0.95;rqf26=0.9; vgf13=0.95;vgf26=0.9; TD26 For Dog-leg expt. Unloaded Loaded Solid curves: TD26 Dashed curves: For Dog-leg expt.

  6. qf13=0.6;qf26=0.4; rqf13=0.8;rqf26=0.6; vgf13=0.8;vgf26=0.6; <103.7>

  7. P/load= 18.4/(N*4)=176 kW 18.4 MW

  8. Modifying last cell HFSSv13

  9. qf13=0.98; rqf13=0.94; vgf13=0.936;

  10. Modifying last cell HFSSv13

  11. Next? • Changing the WG width is extremely sensitive and may not be advisable • Alternatively, we can change the load positions without changing the geometry • To be seen!

  12. Additional slides

  13. Modifying last cell HFSSv13

  14. qf13=0.4;qf26=0.4;

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