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MQW review and report 2009

MQW review and report 2009. Per Hagen (TE/MSC ) 09.06.2009. Acknowledgements: X. Panagiota (2008 analysis), D. Cornuet + M. Buzio (measurements), G. de Rijk + E. Todesco (discussions ). Objectives. Write report about MQW FiDeL model Review analysis and results in 2008

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MQW review and report 2009

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  1. MQW review and report 2009 Per Hagen (TE/MSC) 09.06.2009 Acknowledgements: X. Panagiota (2008 analysis), D. Cornuet + M. Buzio (measurements), G. de Rijk + E. Todesco (discussions)

  2. Objectives • Write report about MQW FiDeL model • Review analysis and results in 2008 • Add harmonics for field quality studies

  3. Short about MQW design • Normal conducting (cleaning sections IR3+IR7, radiation) • “Two in one design”, common iron yoke(field coupling!) • 46 mm aperture radius, magnet length = 3.108 m (as defined in MAD) • Two operational modes (F= focus, D=defocus) • “A” = F/D or D/F design G=35 T/m for I=710A (max field ~1.5 T) • “B” = F/F or D/D design G=30 T/m for I=600A • Both apertures powered in series • current inverted in ap for B mode

  4. MQW optics layout IR3 • All “A” magnets in Q4.L3 + Q4.R3 connected in series • All “A” magnets in Q5.L3 + Q5.R3 connected in series • Each “B” magnet (2 aps) individually powered • π means magnet vertically rotated (shield power cables from radiation coming from collimators)

  5. MQW optics layout IR7 • All “A” magnets in Q4.L3 + Q4.R3 connected in series • All “A” magnets in Q5.L3 + Q5.R3 connected in series • Each “B” magnet (2 aps) individually powered • π means magnet vertically rotated (shield power cables from radiation coming from collimators)

  6. G and I according to LHC V6.503 optics • “B” magnets in IR7 hardly used as all • No measurements below 30A • Asked for more “low-current” measurements

  7. MQWA “local” transfer function (middle of magnet) • Local measurements for 30, 100, 150, 300, 400, 500, 600, 650 A (ramp-up)

  8. Spread in MQWA TF local measurements • Strategy: Use local measurements • for the shape! • Spread in MQWA TF integral measurements

  9. MQWA integrated transfer function • Local measurements for 40, 200, 710, 810 A (ramp-up) • Strategy (= 2008): Use integral measurements • for calibration! FiDeL 31.03.2009

  10. Combined MQWA integrated transfer function (units) • Combining local and integral measurements • Defining geometric at 200 A • Plot the TF(I) mean value minus geometric (units) • Use meanresidual magnetisationand saturation to fit • Use individual geometric value per magnet

  11. Spread in MQWA TF geometric by circuit (small!) • Fit of saturation Use points > 200 A

  12. Fit of resmag • Fit parameters Use points <= 200 A • Residual fit error (max 20 units) • Compared to 2008: • Same strategy • same geometric values • Fit parameters changed slightly because found fit with less max residual error

  13. MQWA field errors (except b3 = new exercise!) • No systematic skews • b1, b9 eliminated in global feed-down correction • Inspect each ap separately (do not miss odd functions!) • Decide to fit b3, b5, b7 for each ap • And b4, b6 both ap combined • Use geometric at 200 A for everything else • Use only integral measurements

  14. Strategy (new 2009):Use only geometric for b10, a3 …

  15. Etc …

  16. MQWA harmonic fit parameters

  17. MQWB “local” transfer function (middle of magnet) • Local measurements for 30, 40, 200, 600 A (ramp-up) 22

  18. Spread in MQWB TF local measurements • Strategy (new 2009) • Fit each magnet individually • 1 magnet = circuit • 8 circuits + spares • Spread in MQWA TF integral measurements 23

  19. MQWB “integral” transfer function • Local measurements for 40, 200, 600 A (ramp-up) • “Desperate” for incorporating local measurement at 30 A

  20. MQWB 5 no “pro” fit! • Local measurements does not fit! • Don’t worry! It is currently a spare so use it for “A” mode • Also for MQWB 36 and 51 we are missing 30 A measurement so improvise (=invent a value for 30) by finding the most similar

  21. Combined MQWB integrated transfer function (units)

  22. Spread in MQWB TF geometric by circuit • Fit of SAT in MQWB 6 • Fit of RESMAG in MQWB 6 • Residual fit error in MQWB 6

  23. MQWB harmonic fit parameters

  24. MQWB field errors (new exercise!) • Analysis and conclusions similar to MQWA so skip details here! • Fit the average for all “B” circuits + spares

  25. Effective change in current predictions2009vs 2008 Everybody lies

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