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David Urner, Armin Reichold , Paul Coe, Matthew Warden, Geoff Rayner

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Presentation on theme: "David Urner, Armin Reichold , Paul Coe, Matthew Warden, Geoff Rayner"— Presentation transcript:

1 David Urner, Armin Reichold , Paul Coe, Matthew Warden, Geoff Rayner
WP 3 MONALISA Monitoring Alignment and Stabilisation with high Accuracy (Previously known as StaFF) David Urner, Armin Reichold , Paul Coe, Matthew Warden, Geoff Rayner

2 Contents Motivation Overview of system The distance meter
Design Construction Data analysis Future developments 12 April 2007 MONALISA - M. Warden

3 Motivation A critical requirement for achieving and maintaining luminosity in ILC is: Stability of Beam Delivery System This is true for BDS as a whole And particularly so for the final focussing quadrupoles Achieving stability requires accurate monitoring of magnet positions 12 April 2007 MONALISA - M. Warden

4 Motivation 12 April 2007 MONALISA - M. Warden

5 The Challenge: Develop an optical system to accurately determine relative position and orientation in 6D Direct line of sight may not be available In general, such a system needs: Distance meters Straightness monitors 12 April 2007 MONALISA - M. Warden

6 The Distance Meter Components: Two modes: Reference interferometer
Measurement interferometers Two modes: Absolute distance measurement, using frequency scanning interferometry Small displacement measurement, using fixed frequency interferometry 12 April 2007 MONALISA - M. Warden

7 The importance of absolute distance measurement
Take two fixed points: Measure distances to a third point: Triangulate this point: Calculate axes for displacement measurements: 12 April 2007 MONALISA - M. Warden

8 Compact Measurement Interferometer
measurement distance Simple, compact design Gold-coated beam-splitter cube acts as one interferometer arm Will replace far mirror with corner cube Allows for easy alignment Can simultaneously measure distances to many points receiving fibres launch fibre 12 April 2007 MONALISA - M. Warden

9 Reference Interferometer
Parallel Reference Interferometer s Both interferometers share the same phase step from piezo mounted mirror Taking two measurements gives a measure of accuracy Can keep one interferometer as a benchmark, and test alternatives with the other 12 April 2007 MONALISA - M. Warden

10 From design to reality Have constructed both reference and measurement interferometers Testing them now 12 April 2007 MONALISA - M. Warden

11 Preliminary Data Analysis
Measurement Interferometer Start with raw photodiode voltages Extract reference phase Fit sinusoids to measurement interferometer voltages Reference Interferometer 12 April 2007 MONALISA - M. Warden

12 Future Development Move ahead with distance meter development
Hardware design Analysis methods Change to evacuated interferometers 12 April 2007 MONALISA - M. Warden

13 Thank you for listening
…time for lunch?

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