design considerations for the esrf upgrade program experimental hall ex2 slab
DESCRIPTION
Design Considerations for the ESRF Upgrade Program Experimental Hall EX2 Slab. David Martin. Design Considerations for the ESRF Upgrade Program Experimental Hall EX2 Slab. The ESRF Upgrade program Tolerances for the experimental hall slab What we can say about these tolerances Summary. - PowerPoint PPT PresentationTRANSCRIPT
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DESIGN CONSIDERATIONS FOR THE ESRF UPGRADE PROGRAM
EXPERIMENTAL HALL EX2 SLAB
David Martin
David Martin ESRF Alignment and GEodesy 1
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DESIGN CONSIDERATIONS FOR THE ESRF UPGRADE PROGRAM EXPERIMENTAL HALL
EX2 SLAB
• The ESRF Upgrade program• Tolerances for the experimental hall slab• What we can say about these tolerances• Summary
David Martin ESRF Alignment and GEodesy 2
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The ESRF Upgrade Program
The 286M€ Upgrade will focuson five highlight areas:
• Nano-science and nanotechnology• Pump-and-probe experiments and
time-resolved science• Science at extreme conditions• Structural and functional biology and
soft matter• X-ray imaging
David Martin ESRF Alignment and GEodesy 3
X-rays are an ideal tool to study nano-objects, as X-ray wavelengths are perfectly
matched to this length scale.
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The ESRF Upgrade Program
David Martin ESRF Alignment and GEodesy 4
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Long Synchrotron Radiation Beamlines
David Martin ESRF Alignment and GEodesy 5
Long beamlines can be compared to a microscope. The principal measure of merit is spatial resolution.
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Long Beamlines
David Martin ESRF Alignment and GEodesy 6
The size of the focused x-ray probe spot size depends on:• the source size, • the distance between the source and the focusing optics p, and • the working distance between optics and the experimental sample q.
At the ESRF p=150 m and q=0.05 m so q/p=3000-1 → theoretical probe size ~10 nm
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Translation Tolerance
David Martin ESRF Alignment and GEodesy 7
Tolerance is 10% of 50 nm probe size e = 5 nmover a period of 30 minutes
150 m0.05 m = 15 µmU(trans) = × 5nm
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Rotation Tolerance
David Martin ESRF Alignment and GEodesy 8
Tolerance is 10% of 50 nm probe size e = 5 nmover a period of 30 minutes
5 nm0.05 m = 100 nradU(rot) =
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Long Term Site Movements
David Martin ESRF Alignment and GEodesy 9
1997 to 2008
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Medium Term Site Movements - Excavation
David Martin ESRF Alignment and GEodesy 10
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Medium Term Site Movements – Dam Purging
David Martin ESRF Alignment and GEodesy 11
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Medium Term Site Movements – Dam Purging
David Martin ESRF Alignment and GEodesy 12
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Medium to Short Term Movements
David Martin ESRF Alignment and GEodesy 13
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Sampling Explanation –Short Term Movements
David Martin ESRF Alignment and GEodesy 14
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Sampling
David Martin ESRF Alignment and GEodesy 15
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Sampling
David Martin ESRF Alignment and GEodesy 16
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Sampling
David Martin ESRF Alignment and GEodesy 17
σ=1.4 um one point on graph
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Long Beamline Translation Movements
David Martin ESRF Alignment and GEodesy 18
Recall - tolerance 15 um over 30 minutes
270 nm
2100 nm
27 days
2¼ days
y = 1.00 1.11 1.26 2.67
x = dH / Distance y = x / min(x)
For 250 m long beamline movement after 30 minutes is estimated between 1.1 um and 5 um
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SR Straight Section Rotation
David Martin ESRF Alignment and GEodesy 19
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SR Straight Section Rotation
David Martin ESRF Alignment and GEodesy 20
Recall - tolerance 100 nrad over 30 minutes
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Slab Rocking
David Martin ESRF Alignment and GEodesy 21
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Slab Rocking
David Martin ESRF Alignment and GEodesy 22
Recall - tolerance 100 nrad over 30 minutes
8 hrs
5½ hrs
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Slab Curling
David Martin ESRF Alignment and GEodesy 23
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Slab Curling
David Martin ESRF Alignment and GEodesy 24
15
26
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Slab Curling
David Martin ESRF Alignment and GEodesy 25
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Slab Curling
David Martin ESRF Alignment and GEodesy 26
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Slab Curling
David Martin ESRF Alignment and GEodesy 27
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Slab Curling
David Martin ESRF Alignment and GEodesy 28
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Slab Curling
David Martin ESRF Alignment and GEodesy 29
Recall - tolerance 100 nrad over 30 minutes
370 nrad 1m from slab centre
1100 nrad 3m from slab centre
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Beamline Mirror Rotation Movements
David Martin ESRF Alignment and GEodesy 30
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Beamline Mirror Rotation Movements
David Martin ESRF Alignment and GEodesy 31
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Summary- What can we say?
• Translational stability of 15 µm over 30 minutes appears to be easily achievable,
• Rotational stability of 100 nrad over 30 minutes is a challenge,
• Observations and simulations have shown that slab curling due to temperature variations is the limiting design case in the new experimental hall slab for the ESRF Upgrade program.
David Martin ESRF Alignment and GEodesy 32