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Designing multi-anvil assemblies: The COMPRES cell assembly project

Designing multi-anvil assemblies: The COMPRES cell assembly project. Kurt Leinenweber. Challenges:. Thermocouple has to work well Wide range of P and T desirable for each assembly Easy to assemble Not expensive Specs have to be repeatable from year to year (well-documented).

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Designing multi-anvil assemblies: The COMPRES cell assembly project

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  1. Designing multi-anvil assemblies:The COMPRES cell assembly project Kurt Leinenweber

  2. Challenges: • Thermocouple has to work well • Wide range of P and T desirable for each assembly • Easy to assemble • Not expensive • Specs have to be repeatable from year to year (well-documented)

  3. Five sizes of octahedra - 8 mm, 10 mm, 14 mm, 18 mm and 25 mm - used in the COMPRES assemblies.

  4. The octahedra showing the sample holes already molded in.

  5. Gasketing Gasket setup using pre-cut paper and pre-milled gaskets, shown on the bottom 4 cubes of the “nest.”

  6. Gasketing (cont.) Pre-cut paper that is used to position the gaskets.

  7. Gasketing (cont.) ASU’s shop foreman, Rick Flubacher, and an automated mill.

  8. Gasketing (cont.) Trial milling of pyrophyllite gaskets on a programmable mill.

  9. Gasketing (cont.) COMPRES machinist, Brian Nagy, and the COMPRES automated lathe.

  10. Assembly Cutting thermocouple slots in a lanthanum chromite sleeve for the 8/3 assembly on the automated lathe.

  11. Assembly (cont.) Rhenium furnace (size 5.4 mm by 8 mm) cut using wire EDM (Electrical Discharge Machining), for the 8/3 assembly.

  12. Assembly (cont.) The 8/3 assembly with the lanthanum chromite sleeve and the rhenium furnace in place.

  13. Modification for x-ray Beam path (green) through the 8/3 assembly (courtesy of Emmanuel Soignard).

  14. Modification for x-ray (cont.) NEW: Special rhenium furnace design for in-situ x-ray experiments in the 8/3 assembly, including a central slit for the x-ray beam.

  15. Testing “COMPRES care packages” ready for shipping.

  16. Testing (cont). “Big blue” multi-anvil at ASU (frame is from Clifton Fluid Power, Inc.; module made in-house).

  17. Testing (cont). 14/8 “G2” assembly after squeezing.

  18. Results for three “locked” assemblies • Calibration curves • Success rates • Suitability for offline and in-situ work • (note: because development of too many new things can be confusing, we “lock” certain designs so that they won’t change, while we continue to develop others).

  19. 14/8 “Caltech” assembly 14/8 “Caltech” assembly (lanthanum chromite step-heater)

  20. 14/8 “Caltech” assembly thermal profile

  21. 14/8 “G2” assembly

  22. 8/3 assembly

  23. 8/3 assembly (cont): room temperature calibration.

  24. 8/3 assembly (cont.): Thermal profile.

  25. 8/3 assembly (cont.) Effect of temperature on pressure.

  26. 10/5 “Tami” assembly

  27. 10/5 “Tami” assembly (cont.): Pressure calibration

  28. 10/5 assembly (cont.): Effect of temperature on pressure

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