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Surface Profilometer Measurements of MERIT Primary Containment Chamber: Inspection Results

This report details the surface inspection of the MERIT Primary Containment Chamber conducted using the Zeiss HandySurf E-35 surface profilometer. Concerns about high-velocity mercury beads inducing pitting on the chamber interior prompted this quantitative assessment. Prior photography showed no visible issues, but precise measurements were desired around the viewports. The report outlines the specifications of the surface testing equipment, presents comparative results from various scans around the chamber, and discusses the challenges of detecting minute surface irregularities.

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Surface Profilometer Measurements of MERIT Primary Containment Chamber: Inspection Results

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  1. MERIT Primary Containment Chamber Surface Inspection V. Graves MERIT EVO November 23, 2011

  2. Surface Profilometer Measurements of MERIT Primary Containment Chamber • Concern that high-velocity mercury beads generated during MERIT experiment might have induced pitting on the interior surface of mercury jet chamber • Photography of the surfaces in Sept 2010 revealed no observable surface issues • Desired to have a quantitative measurement of the surface profile around the viewports

  3. Zeiss HandySurf E-35 • Portable, hand-held surface tester for measuring roughness and contour • Output • Read-out unit provides calculated values • Printer • Data points to Excel

  4. Handysurf Specifications • Traversing length: 12.5mm • Tracing speed: 0.6mm/s • Evaluation length: 0.4 – 12.5mm with 0.1mm step 0.4/1.25/4/12.5mm • Measuring range: 40/160μm • Resolution: 0.02μm • Stylus radius: 5μm • Skid: Sapphire, radius 40mm

  5. Surface Finish Applications Guide • Various statistical parameters that Surface Profilometers support • Various international standards define these parameters • We’re really interested only in the raw profile data

  6. Boston University LithotripterTests done in 2002 in support of SNS Hg Target R&D • Test capsules had test specimens welded to each end • Capsule filled with mercury and mounted inside plastic jar • Maximum pressure was a few tens MPa • One hertz operation • Testing covered 10, 100, 103,104 and 105 pulses

  7. Some Control Measurements • Specimens had known surface finishes prior to experiment • Specimens have varying degrees of surface damage Click Image to Play Video

  8. Comparative Results – Different Scales Specimen 11 Specimen 13 Approximately 7500 pts / 8mm sample length Specimen 14 Specimen 18 What distinguishes a pit from other surface irregularities?

  9. Scans Performed On/In Chamber • Scans obtained around 4 viewports on right side as seen by beam • A few scans on exterior for comparison • All scans 12.5mm in length (maximum)

  10. Some Exterior Scans on Chamber – A Machined Surface R01 Note the peaks of these scans are relatively flat from machining, while the valleys are deep R02

  11. Arithmetic Mean Deviation of Profile

  12. Some Random Interior Scans – A Raw Stock Surface R03 Both the peaks and valleys of these scans are relatively jagged R04

  13. Interior/Exterior Comparison R01 (Exterior Scan) R04 – Interior Scan

  14. Viewport 2 Scans 1-2 P2_01 P2_02

  15. Viewport 2 Scans 3-4 P2_03 P2_04

  16. Viewport 2 Scans 5-6 P2_05 P2_06

  17. Viewport 2 Scans 7-8 P2_07 P2_08

  18. Comments • SNS specimens were polished to a roughness of a few microns prior to use – a known condition • Would like to compare scans from impacted specimens with those from unused specimens • No distinguishable differences between any of the interior scan profiles of MERIT chamber, whether around a viewport or not • Detecting minute pits in a rough surface is practically impossible using mechanical means

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