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Conditioning in RF structures

Conditioning in RF structures. A. Degiovanni, J. Giner Navarro, W. Wuensch 02-04-2014 CLIC RF Structure Development Meeting. Conditioning history of two structures at KEK and CERN. CERN TD26R05CC conditioning history plot. 11168 BDs. TD26R05 CC conditioned at CERN. BDR[ bpp ].

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Conditioning in RF structures

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  1. Conditioning in RF structures A. Degiovanni, J. Giner Navarro, W. Wuensch 02-04-2014 CLIC RF Structure Development Meeting

  2. Conditioning history of two structures at KEK and CERN • CERN TD26R05CC conditioning history plot 11168 BDs

  3. TD26R05 CC conditioned at CERN BDR[bpp] automatic conditioning ON 7e-05 2e-05 equivalent conditioning curve with constant pulse length of 250 ns since the beginning It would take longer time to reach the same gradient with smaller BDR (as expected) • equivalent conditioning curve with: • constant pulse length of 250 ns since the beginning • constant BDR of 1e-6 bpp/m

  4. Conditioning history of two structures at KEK and CERN • TD24R05#4 at KEK T. Higo CLIC Workshop 2014

  5. TD24R05#4 conditioned at KEK - history Conditioning BDR measurements 1060 BDs 591 BDs

  6. TD24R05#4 conditioned at KEK BDR[bpp]= 1.6e-06 2.8e-06 6.6e-06 5.7e-06 1.1e-06 3.2e-06 Conditioning curve of TD24R05 at KEK • equivalent conditioning curve with: • constant pulse length of 250 ns since the beginning • constant BDR of 1e-6 bpp/m

  7. BDR during conditioning Moving average with a window of the last 10 MPulses

  8. Comparison of conditioning curves gradient normalized gradient

  9. Comparison of E0* vs #BD Same conditioning level at different number of BD.

  10. Normalized gradient in LOG-LOG scale Linear behaviour in this region, which means that conditioning can follow a power law

  11. Normalized gradient in LOG-LOG scale – Linear fit A = 0.287 +/- 0.001 A = 0.2579 +/- 0.0006

  12. Normalized BDR in LOG-LOG scale

  13. Normalized BDR in LOG-LOG scale – Linear fit A’ = -8.35 +/- 0.02 A’ = -7.74 +/- 0.02

  14. EXTRA SLIDES

  15. Normalized Gradient

  16. Normalized Gradient VS #RF Periods (tpulsex12GHz)

  17. Normalized Gradient Overlapped

  18. Linear-Log and Log-Log scale plots

  19. Normalized Surface E field

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