Preparing t he SPS complex alignment for fut ure LHC runs. Pat rick Best mann

Transcription

1 Preparing t he SPS complex alignment for fut ure LHC runs Pat rick Best mann IWAA 2014 IHEP, Beijing, China

2 Outline Introduction Long Shutdown 1 easurement and alignment strategy Planning Vertical alignment SPS ring Horizontal alignment of the SPS ring TI2 & TI8 Transf er lines TT10 Transf er line P. Bestmann IWAA2014 IHEP, Beijing, China 2

3 Introduction P. Bestmann IWAA2014 IHEP, Beijing, China 3

4 CERN LS1 Initially intended for the LHC consolidation Start of LHC Injector Upgrade Project Working towards Higher Luminosity LHC injectors need to push their boundaries to deliver the needed beam qualit y 15 onth of SPS shutdown is the unique opportunity to improve the alignment in the whole complex P. Bestmann IWAA2014 IHEP, Beijing, China 4

5 Strategy SPS ring Levelling + alignment 6 w SPS Se xt ant 6 Re alignme nt H+V 8 w SPS Quads horizontal survey 6 w SPS Quads horizontal alignment 4 w SPS Dipole + inte m. Alignement H+V 20 w TI2 Transfer line survey and alignment 6 w TI8 Transfer line survey and alignment 20 w TT10 Transfer line survey and alignment 12 w Change of agnets / Upgrades and installation P. Bestmann IWAA2014 IHEP, Beijing, China 5

6 Planning P. Bestmann IWAA2014 IHEP, Beijing, China 6

7 SPS vert ical prof ile easured and corrected every year 6.9km, DNA03 double run with1800 observations LHC P. Bestmann IWAA2014 IHEP, Beijing, China 7

8 Sextant 6 Cumulated ground movements have build a sharp excursion in the vertical profile Limiting aperture and performance of the machine P. Bestmann IWAA2014 IHEP, Beijing, China 8

9 Sextant 6 constraints Jacks were at the end of the range Exchange of PU Jacks and additional shimming TI2 extraction in the center of excursion Interconnects were kept closed Rest rict s roll angle and t ransversal off set s Delicat e load t ransfer t o jacks Double actuator hydraulic Independent adjustment of volume and pressure P. Bestmann IWAA2014 IHEP, Beijing, China 9

10 New handling equipment P. Bestmann IWAA2014 IHEP, Beijing, China 10

11 Strategy 3 Step approach to keep track Relative vertical displacements for f ocussing Quadrupoles Reference measurement Lifting with exchange of jacks and shims Realignment to new vertical, but initial horizontal position Alignment of defocussing quadrupoles using the f ocussing as reference Alignment of all intermediate components P. Bestmann IWAA2014 IHEP, Beijing, China 11

12 Strategy P. Bestmann IWAA2014 IHEP, Beijing, China 12 SPS FoDo Latt ice B Q F Q D Q F Q D Q D B QD QF QF B B B B B B B B B B B B B B B B B B B B B B

13 Result s 92 Quadrupole agnets aligned P. Bestmann IWAA2014 IHEP, Beijing, China 14

14 SPS Horizontal profile Wire offset measurements Datum fixed on one Point with radial corridors for some straight sect ions P. Bestmann IWAA2014 IHEP, Beijing, China 15

15 Beam Based Alignment Very final adjustments to Orbit Corrector agnets not strong enough at 450GeV easurements done by the operation team during each startup Cumulated 40 volontary displacements Change from Q26 to Q20 Optics All displacements deleted during LS1 Two iterations done with 10 agnets in V and 10 in Horizontal direction P. Bestmann IWAA2014 IHEP, Beijing, China 16

16 Q20 Orbit finished P. Bestmann IWAA2014 IHEP, Beijing, China 17

17 Transf er Lines TI2 & TI8 Geologically unstable Full realignment of TI8 in both planes Only Quadrupoles of TI2 in both planes St rat egy is basically t he same as t he one f or t he SPS or LHC P. Bestmann IWAA2014 IHEP, Beijing, China 18

18 TI2 Vertical Profile P. Bestmann IWAA2014 IHEP, Beijing, China 19

19 TI8 Vertical Profile P. Bestmann IWAA2014 IHEP, Beijing, China 20

20 TT10 Transf er line Delivering beam from PS to SPS complex Showed invert heave plus compression racks in the crown and tension/shear cracks at the level of the shoulder P. Bestmann IWAA2014 IHEP, Beijing, China 21

21 easurements P. Bestmann IWAA2014 IHEP, Beijing, China 22

22 Work Zone P. Bestmann IWAA2014 IHEP, Beijing, China 23

23 Reinforcements P. Bestmann IWAA2014 IHEP, Beijing, China 24

24 Future onitoring Regular monitoring of Profiles Installation of new Network points all along TT10 Inst allat ion of a fiber opt ic permanent monit oring syst em P. Bestmann IWAA2014 IHEP, Beijing, China 25

25 With contributions of Philippe Dewitte, James Ridewood, Richard Francis orton, Stephan Cettour Cave