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Optimization of Tertiary Collimators for Residual Dose Attenuation in Air

This project focuses on optimizing tertiary collimators to attenuate residual dose in air and protect expensive collimator components from damage in case of beam failure. It includes the extension of the MARS Graphic User Interface (GUI) for better functionality and integration with existing frameworks.

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Optimization of Tertiary Collimators for Residual Dose Attenuation in Air

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  1. Tertiary Collimators Residual Dose Attenuation In Air MARS Graphic User Interface DPA At High Energy September 20, 2006 Accelerator Division Seminar Fermilab Maura E. Monville

  2. Project 1. Tertiary Collimators • Project 2. Residual Dose Attenuation In Air • Project 3. MARS Graphic User Interface • Project 4. DPA At High Energy Outline

  3. Tertiary Collimators OptimizationIP1 and IP5 Damage Sources • Collimator Tails • FNAL Calculations From CERN Source-Storm Files • Beam Gass • FNAL Model Spans 512 m From IP5/IP1 Purpose Of Tertiary Collimators • Remove Particles Scattered By Interaction With Residual Gas And Collimator Tails • Protect Expensive Collimator Components From DamageIn Case Of Beam Failure

  4. Tertiary Collimators Optimization TCTH and TCTV

  5. Isocontours For Residual Dose Attenuation In Air

  6. Isocontours For Residual Dose Attenuation In Air Dose At Distance r From Cylinder Surface Attenuation Function

  7. Extension Of MARS Graphic User Interface GUI Extension Strategy & Plan • Prevent erroneous command sequences • Detect & Correct Entry Typos • Improve • Self Diagnostic • Data Analysis & Postprocessing • Consistency & Robustness • Environments Integration & Exclusion: • Histograms, Tracks, Geometry • Look & Feel • Add New Features • Integration Of New Features With The Pre-Existing Framework

  8. Extension Of MARS Graphic User Interface • Problems Fixed • Tracks • Independence Of The Geometry Environment • Start-track / End-track Negative Number Entry • Integration With The Navigation Function • GUI Response To Typos • Interaction With The Magnification Function • Interference With The Histogram Environment • Integration With The Geometry Environment • Histograms • OFF/ON Toggle Histogram Resetting • OFF/ON Toggle Integration With The Histograms Selection List • Raised Point Info Widget Numerical Upper Limit ( ) • Fixed Logarithm Data Representation • Fixed System Response To Meaningless Field Entries

  9. Extension Of MARS Graphic User Interface • Problems Fixed • Histograms • Graphic Objects / Texts Overlapping Caused By View Rotations • Integration With The Geometry Environment (Fill, WireFrame) • Interference With The Tracks Environment • Integration With The Navigation Function

  10. Extension Of MARS Graphic User Interface • New Features • Created Four GUI Window Sizes: • Small, Medium, Large, Extra-Large • Added Button For Histogram Data Arbitrary Normalization • Improved Histogram Data Display Resolution • (16,16) (16,8) (16,4) (16,2) • Created Reset Button • Brings Back To The Starting Conditions Erasing The Work Session • ON/OFF Toggle Implemented For Both Tracks And Histograms

  11. Extension Of MARS Graphic User Interface • New Features • Added Button For View Format Change • 1:1, 16:9 • Integrated User Add-On Texts & Arrows With: • Navigation System • View Format Change • Arbitrarily Rotated Colored Text Strings • Linked & Tested Tcl/Tk Extension Library With MARS GUI • Added Heavy Ions MARS Identifier To Track Point Info • Limited Geometry (Fill / Wireframe) Integrated With The Added Features

  12. Extension Of MARS DPA Model • Already Implemented & Tested In MARS • DPA From Nuclear Interactions • To Be Developed & Integrated • DPA From Electro Magnetic Interactions

  13. Extension Of MARS DPA Model • Nomenclature • DisplacementLattice Atom Knocked From Its Lattice Site • Displacement Per Atom (dpa)Average Number Of displacements per lattice atom • Primary Knock On (pka) • Lattice Atom Displaced By Incident Particle • Secondary Knock On (ska) • Lattice Atom Displaced By pka • Displacement Rate (Rd) • Displacements Per Unit Volume Per Unit Time • Displacement Energy (Ed) • Energy Needed To Displace A Lattice Atom

  14. Extension Of MARS DPA Model • Model Formulation: • Determine Number Of Displaced Atoms Produced By A pka • To First Order An Incident Particle With Energy E Can • DisplaceLattice Atoms • (Either Itself Or Through Knock-ons) • ForThere Are No Displacements • For There Is One Displacement • For Assume Energy Shared Equally In • Each Collision • Average Energy Transfer = Half Of • Incident Energy

  15. Schematic tka ska pka or Process Stops When Energy /Atom Drops Below 2Ed  No More Net Displacements Can Be Produced Number Of Displaced Atoms Produced By a pka E Energy / atom Kinchin-Pease model displacements 1 2 4  T

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