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Update on ZS transitions

Update on ZS transitions. B. Salvant Acknowledgments: B. Balhan, F. Caspers, J. Varela, C. Zannini. Context. Presentation at last SPSU on simulations of transitions between ZS tanks Following the comments at the meeting, the simulations were revised and it turned out that:

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Update on ZS transitions

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  1. Update on ZS transitions B. Salvant Acknowledgments: B. Balhan, F. Caspers, J. Varela, C. Zannini

  2. Context • Presentation at last SPSU on simulations of transitions between ZS tanks • Following the comments at the meeting, the simulations were revised and it turned out that: • The stainless steel used was not of the correct type, and the conductivity was overestimated (thanks Fritz!) • The geometry used was really oversimplified • There are damping resistors (as suggested by Jose, and confirmed by Bruno)

  3. Transitions between ZS Effective impedances at low frequency Im(Zlong/n)~ 7 mOhm Im(Zx)~ 2 kOhm/m Im(Zy)~ 8 kOhm/m 1.18 GHz Rs=1.1 MOhm (stainless steel) Q=14000 (stainless steel) 900 MHz

  4. More realistic pumping module • No damping resistor • Stainless steel 316 (conductivity 1.35e6 S/m)

  5. 1st mode: H field Shunt impedance (LinacOhm) F=0.54 GHz Rs=130 kLinacOhm (=65 kOhm) Q=2000 E field No damping resistor, but far from fields

  6. 2nd mode H field Shunt impedance (LinacOhm) F=1.05 GHz Rs=130 kLinacOhm (=65 kOhm) Q=2500 E field No damping resistor

  7. With damping resistor  First try indicates that the 2nd mode is not affected much by the presence of a damping resistor in the middle of the pumping port

  8. With damping resistor and holder  Same conclusion as before. Not much change

  9. Outlook • Impedance given at the last meeting was overestimated • Very complicated structure (volume is not closed on both sides), needs more iterations for convergence studies • Measurements could be redone with TE/ABT if we think it is needed

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