Tube Laser Alignment System Georg Gassner. 2 Delta Undulator Project Tube Laser Alignment System SLAC, December 11 th 2012 Period 32 mm, Length 3.2m Gap.

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Presentation transcript:

Tube Laser Alignment System Georg Gassner

2 Delta Undulator Project Tube Laser Alignment System SLAC, December 11 th 2012 Period 32 mm, Length 3.2m Gap (bore) 6.4mm PM material NdFeB, grade N40UH Vacuum Chamber ID 5.0mm

3 Alignment Scope Determine the x- and y- location of a Hall probe assembly at different z-locations inside the vacuum tube allowing simultaneous position and magnetic measurement. Tube Laser Alignment System SLAC, December 11 th 2012

4 Concept: x-Position Tube Laser Alignment System SLAC, December 11 th 2012 CCD Camera Retroreflector Laser Beam Splitter a) CCD Camera Laser Beam Splitter Retroreflector moved by Δx 2Δx2Δx 2Δx2Δx b) ΔxΔx

5 Concept: x-y-Position Incoming beam: Δx Δy Outgoing beam:-Δx -Δy Tube Laser Alignment System SLAC, December 11 th 2012

6 We already use a laser and a retroreflector => replace laser head with interferometer laser and we get distance. Concept: z-Position Tube Laser Alignment System SLAC, December 11 th 2012 CCD Camera Retroreflector Laser Head Interferometer Beam Splitter Receiver

7 Prism cut from solid 1.5” CCR with diamond core drill Retroreflector (1) Tube Laser Alignment System SLAC, December 11 th 2012

8 Retroreflector (2) Tube Laser Alignment System SLAC, December 11 th Prism Ø 4.5mm - Prism and Hall Probe might not be centered => roll stability important (carbon fiber tube pusher system)

9 Laser - Hardware Agilent 5517B Laser Head –Helium-Neon (632nm), Continuous wave –Beam diameter 6mm –Beam divergence ~0.15mrad Tube Laser Alignment System SLAC, December 11 th 2012

10 Laser - Beam Size Reduction Tube Laser Alignment System SLAC, December 11 th 2012 d 1 =6mmd 2 =2mm  1 =0.15mrad  2 =0.45mrad f 1 =f 2

11 Laser - Beam Focusing Tube Laser Alignment System SLAC, December 11 th 2012 To move the waist of the laser beam out, add focusing lens or move one of the lenses 33 waist

12 Laser Positional Stability Tube Laser Alignment System SLAC, December 11 th 2012

13 CCD Image Point Grey - FL2-20S4M-C –1624x1224 pixel (~7x5mm) –4.4µm pixel size Natural Density Filter (OD=2) to protect CCD Tube Laser Alignment System SLAC, December 11 th 2012

14 CCD Images Tube Laser Alignment System SLAC, December 11 th 2012

15 Image Processing (1) Cross Correlation of two images =>  X,  Y Tube Laser Alignment System SLAC, December 11 th 2012 Manuel Guizar-Sicairos, Samuel T. Thurman, and James R. Fienup, "Efficient subpixel image registration algorithms," Opt. Lett. 33, (2008)

16 Image Processing (2) Tube Laser Alignment System SLAC, December 11 th 2012  Y=0.4 pixel  X=-0.2 pixel

17 Measurement System (1) Tube Laser Alignment System SLAC, December 11 th 2012 CCD Camera 3.2m vacuum tube Retroreflector Laser Head Mirror Interferometer Beam Splitter Receiver Focusing Lenses Ø4.8mm Mirror Hall Probe

18 Measurement System (2) Tube Laser Alignment System SLAC, December 11 th 2012

19 Results – Retroreflector Position Tube Laser Alignment System SLAC, December 11 th 2012 Move the retroreflector from mm through the vacuum chamber and back

20 Summary First tests indicate that sub 50µm accuracy is achievable. Can be triggered together with magnetic measurements. Effects of atmosphere need further investigation especially when system is moving. Tube Laser Alignment System SLAC, December 11 th 2012