Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005...
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Transcript of Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005...
![Page 1: Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005 Polyurethane Balloon (sides only) 10 m Mylar Balloon.](https://reader035.fdocuments.net/reader035/viewer/2022062511/5514dfe355034693478b56e2/html5/thumbnails/1.jpg)
Helium Bag Readiness
![Page 2: Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005 Polyurethane Balloon (sides only) 10 m Mylar Balloon.](https://reader035.fdocuments.net/reader035/viewer/2022062511/5514dfe355034693478b56e2/html5/thumbnails/2.jpg)
Scattering chamber
Clamshell flange (not here yet)
“Coffee can” collimator
0.005” Polyurethane Balloon(sides only)
10 m Mylar Balloon
Front wire chamber
Upgraded Rear wire chamber
E Plane E Plane
20 H targetElectron Beam
10 m mylar foil
![Page 3: Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005 Polyurethane Balloon (sides only) 10 m Mylar Balloon.](https://reader035.fdocuments.net/reader035/viewer/2022062511/5514dfe355034693478b56e2/html5/thumbnails/3.jpg)
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.
![Page 4: Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005 Polyurethane Balloon (sides only) 10 m Mylar Balloon.](https://reader035.fdocuments.net/reader035/viewer/2022062511/5514dfe355034693478b56e2/html5/thumbnails/4.jpg)
![Page 5: Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005 Polyurethane Balloon (sides only) 10 m Mylar Balloon.](https://reader035.fdocuments.net/reader035/viewer/2022062511/5514dfe355034693478b56e2/html5/thumbnails/5.jpg)
Shape of Polyurethane Helium Filled Balloon
206.2 cm
44.0 cm
33.1 cm
38.7 cm
Bottom view
2 Deg
5 cm
25.2 cm
18 Deg
18 Deg
Side view
122.9 cm
33.8 cm
157.8 cm
82.3 cm5 cm
Stretch over aluminum support frame and hot glue poly and terminate with 10 m mylar
Stretch over “coffeecan” collimator and hot glue
![Page 6: Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005 Polyurethane Balloon (sides only) 10 m Mylar Balloon.](https://reader035.fdocuments.net/reader035/viewer/2022062511/5514dfe355034693478b56e2/html5/thumbnails/6.jpg)
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
![Page 7: Helium Bag Readiness. Scattering chamber Clamshell flange (not here yet) Coffee can collimator 0.005 Polyurethane Balloon (sides only) 10 m Mylar Balloon.](https://reader035.fdocuments.net/reader035/viewer/2022062511/5514dfe355034693478b56e2/html5/thumbnails/7.jpg)
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