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Update on ZS transitions

This update discusses recent findings from a presentation at the last SPSU regarding simulations of transitions between ZS tanks. Key issues addressed include the incorrect type of stainless steel used, which led to an overestimation of conductivity, and an overly simplified geometry. Revised simulations show new effective impedances at low frequencies, revealing the complexities of the ZS transition structures. Further iterations for convergence studies and potential re-measurements with TE/ABT are considered necessary to refine the results and improve accuracy.

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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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