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E. Métral

SPS IMPEDANCE ESTIMATES BY LUC VOS IN 1986 and 2003. E. Métral. How different are our predictions (for the vertical impedance) compared to the ones from L. Vos? What are the remaining contributors to the vertical impedance?.

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E. Métral

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  1. SPS IMPEDANCE ESTIMATES BY LUC VOS IN 1986 and 2003 E. Métral • How different are our predictions (for the vertical impedance) compared to the ones from L. Vos? • What are the remaining contributors to the vertical impedance?

  2. Only dipolar impedance here!!!  L. Vos made an assumption for the quadrupolar term!!! from L. Vos (CERN-AB-2003-088 (ABP)) Lepton cavities, all kickers IN 3 MKE OUT 2 MKA OUT, partial shielding 1 MKA, 3 MKE, MKLP, lepton cavities OUT, all shielding 1 MKE OUT 5 MKE IN 4 MKE IN

  3. Vos’ assumptions • L. Vos considered that the vertical coherent tune shift is made up for 1/3 by the quadrupolar tune shift and for 2/3 by the collective tune shift (i.e. from the dipolar impedance) • Summary for the vertical impedance:

  4. Conclusions and outlook (1/2) • Measurements from Helmut predicts an increase of thetotal impedance of 4.5 M/m or 3 M/m for the dipolar impedance (assuming the factor 2/3!) between 2001 and 2006 • Our prediction for the total impedance increase is 5.2 M/m or 3.5 M/m for the dipolar impedance (assuming the factor 2/3!) • Vos’ prediction is 15 M/m for the total impedance increase or 10 M/m for the dipolar impedance (assuming the factor 2/3!)  • I think one can explain better the impedance increase since 2001 • However, one has to look in detail to Vos’ estimate of the impedance in 2001, which seems quite close to the meas. from Helmut, to try and identify our missing contributors

  5. Conclusions and outlook (2/2) from L. Vos (CERN SPS/86-21(MS))

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