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EM Simulation of wakes in BSRT beampipe with extraction mirror

EM Simulation of wakes in BSRT beampipe with extraction mirror. Tool : Time domain solver of ACE3P Suite. Crosscheck with CST Particle Studio. Andriy Nosych / CERN BE-BI-QP Impedance meeting / 25 June 2012. Simplified BSRT model is considered. (BSRT complete assembly).

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EM Simulation of wakes in BSRT beampipe with extraction mirror

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  1. EM Simulation of wakes in BSRT beampipe with extraction mirror Tool: Time domain solver of ACE3P Suite. Crosscheck with CST Particle Studio. Andriy Nosych / CERN BE-BI-QP Impedance meeting / 25 June 2012

  2. Simplified BSRT model is considered (BSRT complete assembly) Mirror back (most likely coated) Beam Silicon 22 mm Mirror front

  3. Excitation: Single bunch with Gaussian charge distribution Charge = 1.7e-8 C Bunch length: 0.3 m / 1 ns / [-4s, 4s] s = 40 mm / 130 picoseconds Bunch transverse size: point

  4. Simulated mirror modifications @ ACE3P Silicon mirror (eps = 11.9,el.cond=2.5e-4) Silicon + coated mirror (by putting an electric boundary on back surface) Stainless-steel mirror Wake potential along beam axis

  5. Simulated mirror modifications @ ACE3P Silicon mirror (eps = 11.9,el.cond=2.5e-4) Silicon + coated mirror (by putting an electric boundary on back surface) Stainless-steel mirror Coated/Steel mirror have a resonant mode at around 658-670 MHz Harmonics?

  6. Crosscheck with CST Particle Studio (coated mirror sample) Full assembly VS. Simplified assembly Full assembly peak at: 640 MHz Simplified peak at: 655 MHz

  7. First test run with 3-bunch train (Steel mirror sample) @ ACE3P Peak at 670 MHz

  8. E-field Magnitude @ ACE3P + E-field probe along white line (mirror edge)

  9. UPDATE Full electric contact between washer and body. Thus no vacuum considered behind washer. “New” complete mirror support assembly Additional cavities behind mirror support. “Ferrite” ring (made of Steel so far, can not simulate ferrite) “Old” simplified mirror support • CONCLUSIONS: • With a complete model of a mirror support, the resonating mode frequency shifts to 600 MHz. • No big difference between resonances with the mirror “in” and “out”. Mirror in Beam-mirror: 22 mm Mirror out Beam-mirror: 50 mm

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