1. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 1 fpet@SLAC.Stanford.edu Franz Peters Wire Position System The Undulator DescriptionTask, Design Objectives & Building Blocks Integration Mechanical Layout Electronics & Local Control Experience Previous Setups & Performance Measurements

2. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 2 fpet@SLAC.Stanford.edu Franz Peters Task of wire position system…. X-Ray runs: Permanent X & Y Position tracking of the 33 Undulator Segments on a Sub-Micrometer scale. Description 133 ABReference Diameter of a human hair No one has tried that in before. In any case we are the first:The first with success or The first with no success

3. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 3 fpet@SLAC.Stanford.edu Franz Peters Design objectives… to be successful Resolution< 100 Nanometer in X & Y direction Instrument Drift < 100 Nanometer per day Moving Range + - 1.5 Millimeter in X & Y direction Accuracy 0.1 % of full Scale Availability Permanent, no interrupts Description

4. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 4 fpet@SLAC.Stanford.edu Franz Peters Principle options, detecting a wire.. CapacitiveThe measurement of small charges limits Resolution and increases Drifts Inductive Electrical noise and mechanical dimension limits resolution and stability. Matched Balanced use of both, electric & magnetic field which meets design objectives mostly. OpticalMicroscope, no Drifts, but Resolution limited by visible wave length. Description

5. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 5 fpet@SLAC.Stanford.edu Franz Peters Matched.., works like an RF directional coupler Description The principle is really simple, but we are shooting for resolution and stability in the region of 10 to the - 5

6. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 6 fpet@SLAC.Stanford.edu Franz Peters 1. 1.Fixed side wire end station 2. 2.Tube, as outer conductor 3. 3.Position Monitor for X & Y direction 4. 4.Pulley side end station 5. 5.Weight, used as constant force 6. 6.The wire: 0.5 mm diameter, stainless steel, Au plated Mechanics Description 1234 5

7. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 7 fpet@SLAC.Stanford.edu Franz Peters Monitor GAP 8 Millimeter square Monitor Length74Millimeter Cross Section29Millimeter square The Monitor 8 mm LoopsWire Description

8. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 8 fpet@SLAC.Stanford.edu Franz Peters Electronic & Local Control Substations Receiver Crates Quad-ADCs Local Control Ethernet LAN Data Base Local Consol Description Link to LCLS Controls via TCP / IP

9. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 9 fpet@SLAC.Stanford.edu Franz Peters Geometry, - or were are the best places for two wires? - Integration One wire interfer with segment installation Supports necessary on both girder sides Roll data are depend on wire sag stability No interferece with segment installation One common support for both wires Roll data are independend from wire sag stability HorizontalVertical

10. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 10 fpet@SLAC.Stanford.edu Franz Peters Monitor Support Integration Two monitors on each end of each girder Segment removable without interfering WPS X-Pos and Y-Pos, can be measured Roll, Jaw & Pitch can be calculated.

11. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 11 fpet@SLAC.Stanford.edu Franz Peters Geometry Integration

12. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 12 fpet@SLAC.Stanford.edu Franz Peters Integration Electronic distribution…Options 1816Undulator segments 4 8 16 Monitors / 19“ Crate 19“ Crate Packages Fault tolerant structure Power 5V,+ - 15V 4 Receiver MPX Controller Legend:

13. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 13 fpet@SLAC.Stanford.edu Franz Peters Result: WPS should never call for a controlled access. With 4 Crate in one place we have some redundancy. Failures at any system level does not affect functionality or performance. Why ? Loss of Fault-tolerant structure ? One of 4 Monitors has no effect One of 4 Crates has no effect One of 4 ADCs has no effect One of 2 Computersloss of roll only Integration But, Roll is available also by HLS

14. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 14 fpet@SLAC.Stanford.edu Franz Peters Proposed substation places.. A & B In case of failure…. …no controlled access to the Undulator hall necessary, because of a fully redundant system structure. Integration

15. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 15 fpet@SLAC.Stanford.edu Franz Peters Substation Layout No additional heat load to the Undulator hall, because of one built in air condition unit with radiators outside. Integration Receiver Crate

16. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 16 fpet@SLAC.Stanford.edu Franz Peters One of two substation One Substation fit between supports under one Undulator segment. Integration

17. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 17 fpet@SLAC.Stanford.edu Franz Peters SLAC FFTBWPS at first designed for FFTB Quadrupole position tracking. Runs a few weeks per year over several years. SLAC Sec10Performance test with 14 Monitors, 2 Wires, 30 Meter wire length at the SLAC alignment tunnel. DESY HERA H1 & Zeus IP straight sections under control by WPS 128 Monitors, 4 Wires, 60 Meter Length, each. Experience

18. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 18 fpet@SLAC.Stanford.edu Franz Peters Performance Test – Sector 10 Experience 2 Wires 30 Meter Length, 14 Monitors

19. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 19 fpet@SLAC.Stanford.edu Franz Peters Four day strip chart of wire to wall motion at Sector 10 Motion of wire end at one side, indicates wall motion on that side 5 Micromter / division Date Experience Noon to Noon Outsite average temperatures 6669 73

20. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 20 fpet@SLAC.Stanford.edu Franz Peters Wall deforming at Sector-10 alignment tunnel over time. Analysis shows Experience

21. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 21 fpet@SLAC.Stanford.edu Franz Peters One Micrometer Wire to wall motion correlates with air temperature cycle Resolution Test… 0.7 Degree K Performance Air Temperature Wire Motion

22. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 22 fpet@SLAC.Stanford.edu Franz Peters Correlation of both curves indicates Drift << 100 Nm / day 100 Nanometer Drift Test 24 hour Ratio (Mon5a / Mon1a) = 19.8 / 0.7 = constant 24 hour period Performance Mon5a Mon1a Micrometer

23. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 23 fpet@SLAC.Stanford.edu Franz Peters 10 Micrometer / div Overall System Test - 32 Days of wall motion tracking - 102030Days 30 Meter wall 1 7 2 3 4 5 6 0 Wire Access LINAC Performance

24. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 24 fpet@SLAC.Stanford.edu Franz Peters Resolution << 100 Nanometer in X & Y direction Instrument Drift << 100 Nanometer per day Summary As experience has shown…. Coming up activities…. Final integration into Undulator needs further engineering Hard- & Software has to be improved for latest updates System Test & Calibration Facility will be neseccary Long distance wire needs further R & D

25. Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 25 fpet@SLAC.Stanford.edu Franz Peters Finally, were we are? 2 Wires, 14 Monitors – or 10 % of LCLS wire system is now working - Upper Wire Lower Wire One Micrometer / division Watching horizontal Sub-Micrometer wire motions, generated by Air Condition Hours 1 7 1 7 End of presentation