Mechanical DesignBy: Richard Shook

Overview

Computer-Aided Design Sample Design Design Process (SLAC) ST-O And Filters

Background Analysis Results Design

Computer-Aided Design

Solid Edge 3D Digital Model Finite Element Analysis (FEA) Robust Editing 2D Drafting (Geometric Dimensioning and

Tolerancing) AutoCAD

2D Model Beam line Layout

Modeling

Purpose Visualization Prototyping Legal

Sample of Modeling

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.

Why Did You Just Show Me This? Organization Clarity Cooperation

Organizational Chart

Mechanical Design Process1. Project

1. Data Sheets2. Base Drawings3. Vendor

Documents2. Design

1. Modeling2. Official Drawings

3. Processing/Releasing

1. Approvals2. Checker3. Document Control

4. Fabrication1. Manufacturer2. Machinist

5. Implementation(Final Assembly)

ST-0 and Attenuation Filters

Filters

Function Parameters

Beam Energy 800 eV to 9000 eV Absorption Length: 10 microns to 100

microns Attenuation factor: 10 microns to 100

microns

Geometry

10.001.0 / xe

Background and Definitions What is attenuation

length/coefficient? What is a k-edge and how can that

help?

Analysis

Intensity:

where I is the intensity of the photon beam, α is the linear attenuation coefficient, x is the path length

Transmission:

Beer-Lambert Law

xeII 0

eIIT0

/xeT

Analysis Cont’dElement K-Edge

(keV)Absorption Coefficient (1/cm2)

1/μ (microns)

Hydrogen 0.014 --- 735.6 E+04

Helium 0.025 --- 41.6 E+04Lithium 0.054 200.269 49.932Beryllium 0.112 1951.20 5.125Boron 0.188 4985.80 2.006Carbon 0.284 9011.27 1.108Sodium 1.072 1247.55 8.016Magnesium 1.305 3335.04 2.998

Used mat’l Acceptable mat’l Rejected mat’l

Data

Transmission Graph

Beam Transmission vs. Photon energy at 20 microns for Beryllium

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 100000

0.01

0.02

0.03

0.04

0.0500000000000001

0.0600000000000001

0.0700000000000001

0.0800000000000001

0.0900000000000001

0.1

0.11

Photon Beam Transmission For Beryllium and Boron Carbide

Be: 20 MicronsBe:40 MicronsBe: 80 MicronsBe: 160 MicronsBe: 320 MicronsBe: 640 MicronsBe: 1280 MicronsBe: 2560 MicronsBe: 5120 MicronsB4C: 2000 MicronsB4C: 4000 MicronsB4C: 6000 Microns

Photon Beam Energy (eV)

Tran

smis

sion

Mechanical Design

Geometric Parameters: Thicknesses (determined by analysis) Filter Cross-Sectional Area Vacuum Other Experiments

Materials Acquired Parts/Vendor Parts

Design

Design Cont’d

Design Cont’d

Design Cont’d

Design Cont’d

Design Cont’d

Acknowledgements

Dept. of Energy, Office of Science, SULI

SLAC Rick Tankersley Paul Stephens Steve Score Josef Frisch

Resources http://mdweb.slac.stanford.edu/index.php http://www.plm.automation.siemens.com/en_us/

products/velocity/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