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SPS WIRE SCANNER IMPEDANCE AND WIRE HEATING STUDIES

SPS WIRE SCANNER IMPEDANCE AND WIRE HEATING STUDIES. E. Piselli, O. E. Berrig, F. Caspers, B. Dehning, J. Emery, M. Hamani, J . Kuczerowski, B. Salvant, R. Sautier, R. Veness, C. Vuitton, C. Zannini. Impedance Meeting 19/05/2014. Motivations.

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SPS WIRE SCANNER IMPEDANCE AND WIRE HEATING STUDIES

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  1. SPS WIRE SCANNER IMPEDANCE AND WIRE HEATING STUDIES E. Piselli, O. E. Berrig, F. Caspers, B. Dehning, J. Emery, M. Hamani, J. Kuczerowski, B. Salvant, R. Sautier, R. Veness, C. Vuitton, C. Zannini Impedance Meeting 19/05/2014

  2. Motivations CERN-SPS WIRE SCANNER IMPEDANCE AND WIRE HEATING STUDIES E. Piselli, O. E. Berrig, F. Caspers, B. Dehning, J. Emery, M. Hamani, J. Kuczerowski, B. Salvant, R. Sautier, R. Veness, C. Vuitton, C. Zannini CERN, Geneva, Switzerland This article describes a study performed on one of the SPS vertical rotational wire scanners in order to investigate the breakage of the wire, which occurred on several occasions during the last year of operation. The thermionic emission current of the wire was measured to evaluate temperature changes, and was observed to rise significantly as the wire approached the ultimate LHC beam in the SPS, indicating the possibility of strong coupling between the beam’s electromagnetic field and the wire. Different laboratory measurements, complemented by CST Microwave Studio simulations, have therefore been performed to try and understand the RF modes responsible for this heating. These results are presented here, along with the subsequent modifications adopted on all of the operational SPS wire scanners.

  3. SPS BWS416 V BWS H BWS beam

  4. SPS Vertical BWS416 Vertical insertion plate W wire (Fritz)

  5. Measurements Vertical BWS Horizontal BWS Probe 0-2GHz Hybrid Σ Δ

  6. Measurements

  7. Measurements

  8. Measurements

  9. Measurements

  10. Measurements

  11. Measurements

  12. Measurements

  13. Measurements

  14. Measurements

  15. Measurements

  16. Measurements HOME IN Sum 15cm out 200-400MHz Diff 15cm out

  17. Measurements HOME IN Sum 15cm out 600-800MHz Diff 15cm out

  18. Measurements HOME IN Sum 25cm out 200-400MHz Diff 25cm out

  19. Measurements HOME IN Sum 25cm out 600-800MHz Diff 25cm out

  20. Simulations Diff 25cm out Sum 25cm out

  21. Conclusions • The tungsten wire insertion seems to improve an average of 7dB • The insertion plates have a stronger effect at high frequencies • Simulations seems to follow quite the measurements

  22. Grazie Emiliano 22

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