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Helium Bag Readiness PowerPoint PPT Presentation


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Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) “Coffee can” collimator. Electron Beam. 20 H target.  E Plane E Plane. 0.005” Polyurethane Balloon (sides only). 10  m mylar foil. Front wire chamber. 10  m Mylar Balloon.

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Helium Bag Readiness

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Helium Bag Readiness


Scattering chamber

Clamshell flange (not here yet)

“Coffee can” collimator

Electron

Beam

20 H target

E Plane

E Plane

0.005” Polyurethane Balloon

(sides only)

10 m mylar foil

Front wire chamber

10 m Mylar Balloon

Upgraded Rear wire chamber


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

  • Transport protons using helium a few mm above atmospheric pressure. Almost as good as using vacuum. More convenient and cheaper.

  • Use company that makes polyurethane helium filled balloons of all shapes and sizes. Polyurethane skin 0.15 - 0.005 “ thick. Will lose helium slowly over a few days. Test leakage rate.

  • Flexible enough to have limited angular movement of BigBite. Show sample material.

  • Stretched over circular snout fixed to scattering chamber and hot glued

  • Stretched over rectangular angle aluminum attached to wire chamber frame and hot glued

  • Investigate stability of the system and radiation damage of polyurethane and glue and measure helium loss rates.


Stretch over aluminum support frame and hot glue poly and terminate with 10 m mylar

Stretch over “coffee

can” collimator and hot glue

Shape of Polyurethane Helium Filled Balloon

157.8 cm

18 Deg

Side view

33.8 cm

18 Deg

82.3 cm

5 cm

122.9 cm

33.1 cm

5 cm

2 Deg

25.2 cm

Bottom view

38.7 cm

44.0 cm

206.2 cm


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


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