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Weeks SEM Users Meeting

Weeks SEM Users Meeting. October 22, 2010. Topics. Introductions Operation BSE detector broken/replaced New sample height procedure Filaments and heating issues Undersaturate filament, but Use bias >0 to tweak tip for nice filament image Use lower current for better images (up to point)

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Weeks SEM Users Meeting

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  1. Weeks SEM Users Meeting October 22, 2010

  2. Topics • Introductions • Operation • BSE detector broken/replaced • New sample height procedure • Filaments and heating issues • Undersaturate filament, but • Use bias >0 to tweak tip for nice filament image • Use lower current for better images (up to point) But then for BSE, use higher Gain Setting (4 vs 3) • Tip: Measurement tool • Caution: Reversed mouse mode • Innovation award: beer cap sample holder • SEM Research User Report: Noriko • Questions for Hitachi Engineer Don Gramer • Suggestions for future meetings

  3. New Sample Height Procedure

  4. Filament Lifetime 2006-2010

  5. 5/1/2007 235 hrs “Normal”: long life and then someone overheated … and it failed … explainable

  6. Not Normal Behavior! 8/28/2010 40.1 hrs!

  7. 06/07/2010 42 hrs Getting weird thinning at tip…. And very weird thinning on legs! Wire is ~100 micron diameter before use

  8. Use “low” filament Tweak gun bias Use not too high, not too low probe current (30? 40?) Now can use vy short stage WD For low current, bump up BSE Gain to “4”

  9. Measurement Tool

  10. But how to (1) remove measurement & (2) turn off green box??

  11. Recently some users found that the “Mouse mode” movement tool took them the opposite direction…. Should move the left point to the right…but it went the opposite way….

  12. Please Do NOT play with this…. NO

  13. If Mouse Mode NOT set for stage, set it HERE

  14. No problem with the specimen holders…..but…. Use only vacuum-appropriate ‘sticky’ substrates to hold material while the epoxy is setting…use only correct epoxy…

  15. SEM Research User Report

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