vibration reduction in x -ray capillary optic fabrication · 2014. 5. 21. · lepp reu final...

LEPP REU Final Presentation August 7, 2008

CHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPP

Vibration Reduction in XVibration Reduction in X --ray ray Capillary Optic FabricationCapillary Optic Fabrication

Justin Hugon1,3, Tom Szebenyi1, Heung-Soo Lee1, Donald Bilderback1,2

1Cornell High Energy Synchrotron Source, 2School of Applied and Engineering Physics, 1,2Cornell University, Ithaca, New York, 3Departement of Physics, Rhodes College, Memphis, Tennesseeemail: [email protected]

Designed Slope

Measured Slope



Capillary Optics

Advantages:• Work with any X-ray Energy• Optically & Mechanically

Robust• EfficientDisadvantages:• Not Imaging Optics



X-ray Science Application: Art History

N.C. Wyeth “Mildest Mannered Man” ca. 1919

N.C. Wyeth “Family Mural Study” ca. 1945

On Top

Underneath

Confocal X-ray Fluorescence: Analyze Buried Layers Non-

Destructively



Capillary Puller

Capillary

Tension Stage

Air Stage(Furnace)



Capillary Evaluation

Optical Metrology Beam Line Evaluation

Far Field X-ray ImageOptical Micrometers



Status of Capillary Fabrication Quality

Profile Errors: 0.5-2 µm rmsSlope Errors: 20-80 µrad rms



Structural Bracing

To Anchor in Floor

Aluminum Cross Bar

Green Bar

View From Above

Tension Stage Support

(Holds Capillary on a String)

Air Stage Support

(Holds Furnace & Metrology)

Capillary in Furnace

Furnace

y

x

Capillary Puller



Structural Bracing, Continued

Improved Puller Structural Bracing

Steel Unistrut

Aluminum Bar



“Ping Tests in Y-direction”

τ

1/e

τ ~ 10s

τy = 13 s

In General:


CHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPCHESS & LEPPPinged Tension Stage Amplitudes

0

5

10

15

20

25

x y x y x y x y

No-bar Cross-bar Green-bar Green & Cross-bar

Max

imum

Am

plitu

de (µ

m)

Experiment #1 ping tension stage in x

Experiment # 2 ping tension stage in y

Pinged Air Stage Amplitudes

02468

101214161820

x y x y x y x y


Max

imum

Am

plitu

de (µ

m)

Experiment # 3 ping air stage in x

Experiment # 4 ping air stage in y

“Ping Tests” Continued



“Ping Tests” ContinuedPinged Tension Stage Amplitudes

0

5

10

15

20

25

x y x y x y x y


Max

imum

Am

plitu

de (µ

m)

Experiment #1 ping tension stage in x

Experiment # 2 ping tension stage in y

Pinged Air Stage Amplitudes

02468

101214161820

x y x y x y x y


Max

imum

Am

plitu

de (µ

m)

Experiment # 3 ping air stage in x

Experiment # 4 ping air stage in y



Fundamental Frequency Cantilever Prediction

4

2

2 AL

EIf n

n ρπκ=

12

3bdI =

875.11 =κ

Air Stage: f1 = 100 Hz

Tension Stage: f1 = 45 Hz

Capillary as a String: f1 = 30 Hz



Predictions v. Observations

•Predicted Frequencies Too High

•Maximum Measurable Frequency 5 Hz

•Source of Vibrations Not Air or Tension Stage Supports



Present Capillary Status



Suggestions for Further Improvement

New Structural Bracing

•Further stiffen the mechanical stages against vibrations

•Does ‘string mounting’ of capillary amplify the vibrations?

•Need improved metrology—Need more sensitive on-board optical equip.Off-line viewing of Capillary Interior profile?



Acknowledgments

Sterling Cornaby

National Science

Foundation

Heung-Soo Lee, Tom Szebenyi (top)Justin Hugon, Don Bilderback

vibration reduction in x -ray capillary optic fabrication · 2014. 5. 21. · lepp reu final...

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