Transport of low energy protons (200-600 MeV/c) from target through BigBite to mwdc

Helium Bag Readiness

Transport of low energy protons (200-600 MeV/c) from target through BigBite to MWDC

Shape of Polyurethane Helium Filled Balloon

Test on Balloons

• Need to always keep inflated above atmospheric pressure

• Monitor during the experiment. This is crucial.

• Mechanical stability of of joints and seams and leak rates

• On the polyurethane balloons and mylar balloons

• Conduct radiation damage test on both types.

• Effects on hot glue joints
• Effects on seams
• Effects on polyurethane

Balloon Milestones

• March
• Design/Draft shape of polyurethane helium containment balloon
• Design Coupling balloon to chamber
• Order sample polyurethane balloon material
• April
• Order prototype polyurethane balloon ( 0.005” thick) and prototype
• and 10 m mylar “pillow shape” balloon.
• Order two extra balloons for protecting PMTs from helium leaks
• Design Helium gas handling system for balloon
• May
• Test all prototype balloons for helium leak rate and radiation damage
• Test gas handling system.
• June-July
• Evaluate test results and make modifications. Decide on many balloons and type. Purchase final balloons
• August
• Assemble flanges, collimator, window, gas handling system, and balloon for further testing.
• September , November, and December
• Continue checking out system and measure loss rates over long term