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Closed-System Issues

Closed-System Issues. Condenser Effects on Drift Lifetime. Reed Andrews 26 January 2009. Effect of Condenser Operation on Lifetime. Condenser On. Condenser On. Imps (A / lifetime). Lifetime. Theories of Condenser-Associated Impurities. Ions Created by liquid separating from metal

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Closed-System Issues

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  1. Closed-System Issues Condenser Effects on Drift Lifetime Reed Andrews 26 January 2009 LAr R&D Briefing

  2. Effect of Condenser Operation on Lifetime Condenser On Condenser On Imps (A / lifetime) Lifetime LAr R&D Briefing

  3. Theories of Condenser-Associated Impurities • Ions • Created by liquid separating from metal • Particles • Ice • Charged Particles LAr R&D Briefing

  4. Characterization Scheme • Place filter materials under condenser outlet LAr R&D Briefing

  5. Characterization Scheme • Blank • Provide baseline • Tube • Remove ions, not particles • Sintered Glass • Remove particles, not ions • Sintered Metal And Steel Wool • Remove particles, ions 10-15 um pores 10 um pores LAr R&D Briefing

  6. 29 Inches Vary Liquid Level 16 Inches PrM PrM LAr R&D Briefing

  7. 29 Inches Argon PrM LAr R&D Briefing

  8. 29 Inches Argon PrM Impurities removed without active filtering LAr R&D Briefing

  9. From Lifetime Data with 29 inches Argon: • Ions not the major problem • Not a large particulate LAr R&D Briefing

  10. 29 Inches Argon PrM Glass Tube Tube Blank Blank Glass LAr R&D Briefing

  11. Model Assumptions Parameters: • Infinite source of impurities • Performance of filter media related by metal surface area LAr R&D Briefing

  12. At lower liquid level: • Sintered Glass has substantially less metal surface for impurity adsorption • Tube has less … • Sintered metal has slightly less … • Blank does not change 29 Inches 16 Inches PrM PrM LAr R&D Briefing

  13. 16 Inches Argon PrM LAr R&D Briefing

  14. General Inferences • Gas provides impurities • Condenser mixes impurities from gas into liquid • Technologies for filtering impurities: • Sintered metal speeds natural exit from liquid LAr R&D Briefing

  15. Future Work • Identify dominant impurity • Water? • Mix/Other? • Techniques For Removing Impurities • Sintered Metal • Existing Filters LAr R&D Briefing

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