Electropolished Aluminum -- outgassing test

Document #:

LIGO-E1100144-v1

Document type:

E - Engineering documents

Abstract:

Measurement of outgassing rates for electropolished aluminum parts. The outgassing rates are sufficiently low for LIGO UHV use; electropolishing of aluminum is acceptable for aLIGO. Note that brite dipping, anodizing and other similar processes leave a porous oxide layer and are not acceptable. Also note that the outgassing rates given are for in-vacuum bakes parts/surfaces, not parts which are subsequently exposed to air, as is the case for aLIGO parts.

Files in Document:

• E1100144-v1 electropolished alu outgassing.pdf (file is not accessible)

Other Files:

• E1100144-v1 RGA Scan F21611 Electro plated test psrts.xls (file is not accessible)
• F21611 Electropolish test cal.rga (file is not accessible)
• F21611 Electropolish test.rga (file is not accessible)
• F21611 Electropolish test.txt (file is not accessible)
• electropolished_alu_rga_data_analysis.m (file is not accessible)

Topics:

• System Engineering
• Vacuum

Authors:

• Dennis Coyne
• Bob Taylor

Notes and Changes:

The outgassing rates are determined with the Matlab m-file included in this DCC entry. The pseudo-inverse solution is not properly constrained to only allow positive outgassing rates for the gas species.

Related Documents:

• LIGO-E1000193: LIGO UHV Qualification Test Results