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Effects of Condenser Operation on Drift Lifetime in Closed Systems

This briefing outlines the impact of condenser operation on the drift lifetime within a closed liquid argon (LAr) system. It discusses the role of impurities generated during liquid separation from metal surfaces and the methods for characterizing these impurities. An examination of filter materials highlights how sintered glass and metal can mitigate ionic and particulate contaminants. Key findings indicate that ions are not the primary concern, and the efficiency of filtering techniques is essential for maintaining the quality of the argon and prolonging drift lifetime.

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Effects of Condenser Operation on Drift Lifetime in Closed Systems

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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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