b 3 Compensation Results OctNov Tracking Test N

b 3 Compensation Results Oct/Nov Tracking Test N. Sammut With several inputs from L. Bottura, M. Lamont, W. Venturini Delsolaro, J. Miles, R. Alemany Fernandez, M. Strzelczyk, R. Mompo, G. Deferne, P. Xydi AB-OP 10 th December 2007

Results from July Tracking Campaign (Magnet 2624: F-bench) Corrective action: After correction for decay on loadline plateaus - Fix shafts that have problems with sectors After increased number of points in loadline - Enable current readout and writing into file Indication that an artefact that shows up as residual magnetisation is present and is systematic - Perform detailed loadline characterisation on each magnet 10 th December 2007 - Improve fitting procedure to compensate for residual magnetisation artefact Power Tracking Test Results N. Sammut

2 nd Result from Oct/Nov Tracking Campaign Reproducibility better than 0. 1 units for b 3 10 th December 2007 Power Tracking Test Results N. Sammut

2 nd Result from Oct/Nov Tracking Campaign These results were obtained after: 1) Handling polarity issues with the correctors 2) Characterising the correctors at the b 3 compensation position 3) (Handling a few hardware problems) 4) In addition, it was observed that the TF of the correctors was off by 1. 5% to 2. 5%. Hence a dedicated measurement was performed where the TF was reduced by 2%. 10 th December 2007 Power Tracking Test Results N. Sammut

3 rd Result from Oct/Nov Tracking Campaign after TF set at 98% -Improved result for MB 2598 -Timing issues at injection still to be solved -TF of 2598 can be decreased by another 0. 5% 10 th December 2007 Power Tracking Test Results N. Sammut

Result from Oct/Nov Tracking Campaign – b 5 compensation 10 th December 2007 Power Tracking Test Results N. Sammut

Next Tracking Campaign (this week) - Verify corrector TF - Verify 2% result - Verify 2. 5% change in TF and perform on Ap 2. Improve as much as possible - Check sensitivity absolute vs compensated mode - Powering history measurements - Perform modelling using short loadlines with 50 A/s pre-cycle - Tests on short vs long injection plateaus. - Timing tests to eliminate delay on injection plateau 10 th December 2007 Power Tracking Test Results N. Sammut

Measurements Needed in 2008 - Long Loadline measurements - Ramp rate pre-cycle dependence measurements - Dedicated degaussing measurements - Test to verify hysteresis compensation - Tests on long vs short injection plateaus - Powering History Tracking Tests (variation over the surface) - Powering History Variations outside parametric space (backed by CUDI simulation) ( to be discussed with operation) - Optimisation cycles - Dedicated hysteresis cycles for correctors 10 th December 2007 Power Tracking Test Results N. Sammut