By: Richard Shook
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Computer-Aided Design
Sample Design
Design Process (SLAC)
ST-O And Filters
 Background
 Analysis
 Results
 Design
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Solid Edge
 3D Digital Model
 Finite Element Analysis (FEA)
 Robust Editing
 2D Drafting (Geometric Dimensioning and Tolerancing)
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AutoCAD
 2D Model
 Beam line Layout
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Purpose
 Visualization
 Prototyping
 Legal
Basic Shape
Protrusion Feature
Able to make extended
features on coincident planes
Cutout Feature
Removing material from
selected bodies
Round Feature
Giving a selected edge, face or
curve a radial feature.
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Organization
Clarity
Cooperation
1.
Project
3.
Data Sheets
2. Base Drawings
3. Vendor Documents
Approvals
2. Checker
3. Document Control
1.
2.
Design
Processing/Releasing
1.
4.
Modeling
2. Official Drawings
Fabrication
Manufacturer
2. Machinist
1.
1.
5.
Implementation
(Final Assembly)
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Function
Parameters
 Beam Energy 800 eV to 9000 eV
 Absorption Length: 10 microns to 100 microns
 Attenuation factor: 10 microns to 100 microns
0.01  e  x /   0.10
 Geometry
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What is attenuation length/coefficient?
What is a k-edge and how can that help?
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Intensity:
I  I 0 e  x
where I is the intensity of the photon beam, α is the linear attenuation
coefficient, x is the path length
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Transmission:
T
I
 e 
I0
T  e x / 
Beer-Lambert Law
Element
K-Edge
(keV)
Absorption Coefficient
(1/cm2)
1/μ (microns)
Hydrogen
0.014
---
735.6 E+04
Helium
0.025
---
41.6 E+04
Lithium
0.054
200.269
49.932
Beryllium
0.112
1951.20
5.125
Boron
0.188
4985.80
2.006
Carbon
0.284
9011.27
1.108
Sodium
1.072
1247.55
8.016
Magnesium
1.305
3335.04
2.998
Used mat’l
Acceptable mat’l
Rejected mat’l
Transmission Graph
Beam Transmission vs. Photon
energy at 20 microns for
Beryllium
Photon Beam Transmission For Beryllium and Boron Carbide
0.11
0.1
Be: 20 Microns
Be:40 Microns
0.09
Be: 80 Microns
0.08
Be: 160 Microns
Transmission
0.07
Be: 320 Microns
Be: 640 Microns
0.06
Be: 1280 Microns
0.05
Be: 2560 Microns
Be: 5120 Microns
0.04
B4C: 2000 Microns
0.03
B4C: 4000 Microns
B4C: 6000 Microns
0.02
0.01
0
0
1000
2000
3000
4000
5000
6000
Photon Beam Energy (eV)
7000
8000
9000
10000
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Geometric Parameters:
 Thicknesses (determined by analysis)
 Filter Cross-Sectional Area
 Vacuum
 Other Experiments
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Materials
Acquired Parts/Vendor Parts
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Dept. of Energy, Office of Science, SULI
SLAC
Rick Tankersley
Paul Stephens
Steve Score
Josef Frisch
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http://mdweb.slac.stanford.edu/index.php
http://www.plm.automation.siemens.com/en_us/products/velocit
y/solidedge/index.shtml
Materials Handbook, 14th ed. Brady, Clauser, Vaccari. McGraw-Hill
1997
http://henke.lbl.gov/optical_constants/
http://www.ct.infn.it/~rivel/Glossario/node30.html#29
http://www.chemguide.co.uk/analysis/uvvisible/beerlambert.html
http://www.files.chem.vt.edu/chem-ed/spec/beerslaw.html
http://physics.nist.gov/PhysRefData/XrayMassCoef/cover.html
http://www.csrri.iit.edu/periodic-table.html