Difference between revisions of "Polhe3 Metal Windows"

Revision as of 21:22, 3 April 2012

Window Pressure Test Setup

• Investigating the possibility of using Larson 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.

UVa pressure test setup for target windows. Larson CP-100-T glass to metal seal attached.

Another view of pressure test setup. Larson CP-100-T glass to metal seal attached.

Side view of pressure test setup, cardboard boxes and crate lid are open.

Top view of pressure test setup with both cardboard boxes closed and weighed down with two half-thick fire bricks on top.

Pressure test setup crate is fully closed.

Pressure test setup blocked with protective wall and caution signs.

High pressure gas delivery plumbing for test setup. Right to left: Regulator tank gauge, output gauge, shutoff valve. Nupro pressure relief valve. Test pressure gauge.

Test pressure gauge P=140psig.

Regulator gauges: Right to left: Tank pressure P=600psig. Output pressure P=137psig.

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