Difference between revisions of "Polhe3 Metal Windows"
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=== Window Pressure Test Setup === | === Window Pressure Test Setup === | ||
| − | * Investigating the possibility of using Larson | + | * Investigating the possibility of using [www.larsonelectronicglass.com Larson Electronic Glass] to metal seals as a means to couple metal windows to glass target chamber. |
* Pressure test setup was assembled at UVa to test glass to metal seals at typical target cell operating pressures. | * Pressure test setup was assembled at UVa to test glass to metal seals at typical target cell operating pressures. | ||
* Initial test on a Larson CP-100-T Pyrex glass to Copper metal seal (1-inch O.D.) performed on Nov 16 & 17, 2001. Test piece was pressurized to approximately 10-atm (137psig) of argon for 24hrs. The glass to metal seal did not explode. Although, 10-atm is low (typical target operating pressure is 12-atm to 13-atm). No leak tests on the seal have been performed during this initial pressure test. We still need to establish that gas will not leak thru seal at high pressures. | * Initial test on a Larson CP-100-T Pyrex glass to Copper metal seal (1-inch O.D.) performed on Nov 16 & 17, 2001. Test piece was pressurized to approximately 10-atm (137psig) of argon for 24hrs. The glass to metal seal did not explode. Although, 10-atm is low (typical target operating pressure is 12-atm to 13-atm). No leak tests on the seal have been performed during this initial pressure test. We still need to establish that gas will not leak thru seal at high pressures. | ||
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| [[Image:Ptest9_cp-100-T_17nov2011.jpg|thumb|upright|220px|Regulator gauges: Right to left: Tank pressure P=600psig. Output pressure P=137psig.]] | | [[Image:Ptest9_cp-100-T_17nov2011.jpg|thumb|upright|220px|Regulator gauges: Right to left: Tank pressure P=600psig. Output pressure P=137psig.]] | ||
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=== Beryllium Foil Material === | === Beryllium Foil Material === | ||
The company [http://materion.com/Businesses/Electrofusion/Products/ProductGroups/Beryllium/BerylliumX-Ray.aspx Materion Electrofusion] supplies various purity Be foil for the X-ray window industry. They provide the following grades: | The company [http://materion.com/Businesses/Electrofusion/Products/ProductGroups/Beryllium/BerylliumX-Ray.aspx Materion Electrofusion] supplies various purity Be foil for the X-ray window industry. They provide the following grades: | ||
Revision as of 10:45, 4 April 2012
Window Pressure Test Setup
- Investigating the possibility of using [www.larsonelectronicglass.com Larson Electronic Glass] to metal seals as a means to couple metal windows to glass target chamber.
- Pressure test setup was assembled at UVa to test glass to metal seals at typical target cell operating pressures.
- Initial test on a Larson CP-100-T Pyrex glass to Copper metal seal (1-inch O.D.) performed on Nov 16 & 17, 2001. Test piece was pressurized to approximately 10-atm (137psig) of argon for 24hrs. The glass to metal seal did not explode. Although, 10-atm is low (typical target operating pressure is 12-atm to 13-atm). No leak tests on the seal have been performed during this initial pressure test. We still need to establish that gas will not leak thru seal at high pressures.
- Ultimately, we would like to place a thin metal window (such as beryllium) on the metal end and then pressure test both the metal window and the glass to metal seal at pressures greater than 12-atm to 13-atm.
- In the future, we will investigate whether it is possible to make a GE180 glass to metal seal and if it will stay leak tight at high pressures.
Beryllium Foil Material
The company Materion Electrofusion supplies various purity Be foil for the X-ray window industry. They provide the following grades:
- PF-60 Beryllium High Purity Foil - 99.0% Be
- PS-200 Beryllium Standard Purity Foil - 98.5% Be
Initial efforts at UVa to determine Be-window feasibility included providing Materion Electrofusion with a proposed Be-window end cap design in Feb 2012. They would produce a copper frame onto which the beryllium foil material would be fused using a silver based braze. Then the copper frame would be electron beam welded onto the copper-glass seal. This two step process is necessary to avoid melting the glass on the seal if one were to braze the window on directly. Also, since the Be-window aperture is to be smaller than the diameter of the glass-metal seal, a frame is necessary to accommodate the beryllium foil via their proprietary method. The cost for small (large) quantities is approximately $2000 ($1000) each window assembly.
