Workshop Chamonix XIV, Elena Wildner AT/MAS1 E. Wildner Geometry of the Main Bends and the Short Straight Sections

Workshop Chamonix XIV, Elena Wildner AT/MAS2 Outline 1. Recall from workshop Work on the shape 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS3 Outline 1. Recall from workshop Work on the shape 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS4 Tolerances, centre of cold bore tube Last WP08 measurement Last industry measurement 15 % can be out horizontally, hard tolerance in industry 1.5 No change w.r.t. Chamonix XIII H axis points to the centre of the machine

Workshop Chamonix XIV, Elena Wildner AT/MAS5 Classification 0 Length R_rt (y) R_rt(y) Silver SLSR SLR MC MQ MB L MCR 0.75 mm 3.1 mm 2.75 mm  h=165  v= 35  h=110  v=60  h=100  v=65 Courtesy Bernard Jeanneret approach suggested by Stephane Fartoukh

Workshop Chamonix XIV, Elena Wildner AT/MAS6 Important items from Chamonix XIII 1. Shape instability 2. Spool piece positioning 3. Data Bases and tools

Workshop Chamonix XIV, Elena Wildner AT/MAS7 Shape instability Example magnet 3041 Workshop in March, outcome: the central support blocked horizontally adjustment to last measurement in industry Plot from web: Geo-data-viewer (courtesy Gregory Bevillard) Only measurements with blocked support discussed in the presentation

Workshop Chamonix XIV, Elena Wildner AT/MAS8 Spool piece positioning The MCS and the MCDO spool piece mechanical axis cannot be measured after the welding of the end cover. Measurements of the magnetic axis are not made systematically The mechanical axis position can be estimated by assuming rigidity of the end part of the magnet (hypothesis checked in many different ways). Measurements of the magnetic axis has been made on a set of magnet from an earlier production. Poor correlation between measurements of magnetic axis and its derived value from mechanical measurements

Workshop Chamonix XIV, Elena Wildner AT/MAS9 Mechanic versus magnetic measurement A campaign was started to verify the measurements of the magnetic axis and the assembly procedure/measurements in industry Measurements: The sextupole was measured on a setup similar to industry, at CERN. The mechanic and the magnetic axis of two magnets using Leica and two different moles were compared. The result of this work is that the magnetic and the mechanic axis correspond well within 0.15 mm on measurement bench. 5 magnets to be tested at CERN to validate this result (TS/SU and AT/MTM) Courtesy Rocio Chamizo

Workshop Chamonix XIV, Elena Wildner AT/MAS10 Data base consolidation, software tools AT-MAS Geometry Data Base filled immediately after the measurements are available for MB and MQ with all geometrical data and derived entities for analysis. Data-viewer for all dipole and quadrupole geometric measurements in industry and at CERN available on on the web. All geometric analysis data for each dipole magnet available as.pdf documents on the web (quadrupoles in progress) All information for installation available in the AT-MAS geometrical database (shifts etc.)

Workshop Chamonix XIV, Elena Wildner AT/MAS11 Outline 1. Recall from workshop Work on the shape 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. Warm-cold relations 6. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS12 Work on the dipole shape: the model Model needed for extracting different features of the shape for example: Positioning problems Local deformations Model: straight mechanical beam supported in three places (no moment) EI=180 MPa m 4 Goal (final measurement) Initial measurement With the model we can simulate changes in positioning In this case no local deformation on this magnet can be seen after simulation of horizontal positioning.

Workshop Chamonix XIV, Elena Wildner AT/MAS13 Vertical positioning or local deformations ? There is a significant local deformation 0.5 m from the end of the dipole. Essentially Ansaldo magnets.

Workshop Chamonix XIV, Elena Wildner AT/MAS14 Local vertical deformations, statistics Vertical flange positions, Alstom (red), Ansaldo (blue), Noell (green). The square represents the mean values and the line the standard deviation. Statistics from October:

Workshop Chamonix XIV, Elena Wildner AT/MAS15 Local vertical deformations, analysis The difference of the positions of the ends between measurements in industry and measurements at CERN. Moving average of 15 magnets plotted every 5th magnet. Red curves represent the mean values and the blue the standard deviation. Positioning differences are modelled to be zero. The shift in flange position of Ansaldo is now close to zero. Alstom Ansaldo Mean Stdev 0.15 Courtesy Marco La China Mean 0.11 Stdev 0.28 Mean 0.00 Stdev 0.20 Noell Alstom Ansaldo Noell

Workshop Chamonix XIV, Elena Wildner AT/MAS16 Local horizontal deformations, statistics Sagitta adjustment at blocking Alstom Ansaldo Noell Alstom Ansaldo Noell Mean Stdev 0.27 Mean Stdev 0.18 Mean 0.04 Stdev 0.27 Statistics from October:

Workshop Chamonix XIV, Elena Wildner AT/MAS17 Local horizontal deformations, analysis Courtesy Marco La China The non nominal sagitta can be detected on the two lobes after the simulated repositioning (goal last industry measurement) If a circular initial shape is assumed the model may explain this. Example for 1mm sagitta change of a circular deviation from nominal: Bias for the ends will be adjusted at the blocking procedure (central support)

Workshop Chamonix XIV, Elena Wildner AT/MAS18 Outline 1. Recall from workshop Work on the shape 3. Results from statistics (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS19 Sagitta deviation from nominal Median 0.00 Quantile (85%) [-1.55,1.59] 48 magnets out Median 0.22 Quantile (85%) [-1.59,1.71] 18 magnets out Median Quantile (85%) [-1.66,1.38] Median 0.50 Quantile (85%) [-1.17,2.5] Before Mars 2004 (blocking of central support): Jan 2005: Mean 0.02 Stdev 1.07 Mean 0.18 Stdev 1.11 Mean Stdev 1.03 Mean 0.56 Stdev 1.15

Workshop Chamonix XIV, Elena Wildner AT/MAS20 Stability of the shape: Difference in sagitta manufacturing-CERN Jan 2005: Goal: to reproduce the shape at the last measurement in industry Before blocking: Mean Stdev 0.21 Mean 0.66 Stdev 0.70

Workshop Chamonix XIV, Elena Wildner AT/MAS21 Outline 1. Recall from workshop Work on the shape 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS22 Spool pieces MCS Aperture 2 Aperture 1 dx dz Mean (0.15, -0.02) Stdev (0.17, 0.21) dx dz Mean (0.14, 0.00) Stdev (0.20, 0.21) dx dz Tolerance Mean: 0.3 Stdev 0.5

Workshop Chamonix XIV, Elena Wildner AT/MAS23 Spool pieces MCDO Aperture 2 Aperture 1 dx dz Mean (0.14, -0.03) Stdev (0.17,0.15) dx dz Mean (0.14, -0.03) Stdev (0.17, 0.15) dx dz Tolerance Mean: 0.3 Stdev 0.5

Workshop Chamonix XIV, Elena Wildner AT/MAS24 Outline 1. Recall from workshop Work on the shape 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS25 Flanges, last measurement at CERN Aperture 1 Aperture 2 Connection Lyra dx dz Mean (0.14, 0.10) Stdev (0.21, 0.23) dx dz Mean (0.19, -0.05) Stdev (0.17, 0.15) dx dz Mean (0.11, 0.12) Stdev (0.22, 0.20) dx dz Mean (0.14, -0.03) Stdev (0.19, 0.17) dx dz

Workshop Chamonix XIV, Elena Wildner AT/MAS26 Outline 1. Recall from workshop Work on the shape using modeling 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS27 Shifts for installation Magnets are blocked at the central support in a way to reproduce the shape measured at the manufacturer (horizontal). If the magnet is out of tolerance for any of the service lines or the cold bore, the magnet may need a shift. This shift should be tolerable for feed down effects and aperture magnetReference meaurement dxdz 2012 WP08C WP08C WP08E WP08E WP08C WP08C WP08D-0.40 Total 68 magnets: 7 shifted, All checked at WP08 (last complete measurement) Courtesy Bernard Jeanneret

Workshop Chamonix XIV, Elena Wildner AT/MAS28 Outline 1. Recall from workshop Work on the shape using modeling 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS29 Geometry measurements available for loading in data base last week measurements from AC mole (magnetic and mechanic) Measurements from stretched wire (warm and cold) Analysis of geometry-data and geometry just started, tolerances for beam still to be defined. Difference in magnetic axis measurements (MQ) with AC mole SSW offset and spread. The SSS Mean: Stdev: 0.27 Mean: 0.20 Stdev: 0.51

Workshop Chamonix XIV, Elena Wildner AT/MAS30 MQ axis, mean values Reference: mechanical measurement

Workshop Chamonix XIV, Elena Wildner AT/MAS31 The SSS on the web Courtesy Gregory Bevillard, Jerome Beauquis

Workshop Chamonix XIV, Elena Wildner AT/MAS32 Outline 1. Recall from workshop Work on the shape 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS33 Cold warm relations Cold-warm ssw dxCold-warm ssw dz Mean (-1.34) Stdev (0.12) MB cold warm relations still need to be measured Results for MQ (14 magnets)

Workshop Chamonix XIV, Elena Wildner AT/MAS34 Outline 1. Recall from workshop Work on the shape 3. Results (MB) 1. Shape 2. Correctors and spool pieces 3. Interconnections 4. Shifts 5. The SSS 6. Warm-cold relations 7. Stability

Workshop Chamonix XIV, Elena Wildner AT/MAS35 Last check before installation at WP09 Geometry is checked for installation using the last complete measurement (WP08) At WP09 there is a reduced measurement where only reference points at the cold mass ends are available (beam screen insertion checks). However this is a last check before installation Movements are detectable, this should be considered. We have not seen clear evidence for any time dependence so far

Workshop Chamonix XIV, Elena Wildner AT/MAS36 Stability WP08-WP09 Average 0.1 mm Average 0.04 mm Average 0.03 mm (without outliers) Measurement accuracy ~0.1

Workshop Chamonix XIV, Elena Wildner AT/MAS37 Summary Blocking of central support gives good results for the geometry Interconnectivity: ends within tolerances (WP08). Aperture: Magnets can be classified to be good for the different LHC positions to take into account all other constraints with good margin. Data bases and software tools for analysis available for MB and for MQ SSS still needs efforts (analysis of measurements and geometry). No alarms at the present Verification set of 5 spool pieces (MCS) in assembled cold mass to be measured and analyzed Cold-warm relations for MB still to be measured and analyzed Magnet stability with time has to be monitored (results from WP09)

Workshop Chamonix XIV, Elena Wildner AT/MAS38 Acknowledgements Thanks to the following people: Marco La China Walter Scandale Jerome Beauquis Gregory Bevillard Marta Bajko Rocio Chamizo Mirco Coccoli Juan Garcia Marco Buzio Dominique Missiaen Patrick Winkes Monique Dupont Bernard Jeanneret Stephane Fartoukh Fabien Seyvet