Designing multianvil assemblies: The COMPRES cell assembly project

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Designing multi-anvil assembliesThe COMPRES
cell assembly project

• Kurt Leinenweber

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

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The octahedra showing the sample holes already
molded in.
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Gasketing

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

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Gasketing (cont.)

• Pre-cut paper that is used to position the
  gaskets.

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Gasketing (cont.)

• ASUs shop foreman, Rick Flubacher, and an
  automated mill.

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Gasketing (cont.)
Trial milling of pyrophyllite gaskets on a
programmable mill.
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Gasketing (cont.)
COMPRES machinist, Brian Nagy, and the COMPRES
automated lathe.
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Assembly
Cutting thermocouple slots in a lanthanum
chromite sleeve for the 8/3 assembly on the
automated lathe.
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Assembly (cont.)
Rhenium furnace (size 5.4 mm by 8 mm) cut using
wire EDM (Electrical Discharge Machining), for
the 8/3 assembly.
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Assembly (cont.)
The 8/3 assembly with the lanthanum chromite
sleeve and the rhenium furnace in place.
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Modification for x-ray
Beam path (green) through the 8/3 assembly
(courtesy of Emmanuel Soignard).
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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.
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Testing
COMPRES care packages ready for shipping.
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Testing (cont).
Big blue multi-anvil at ASU (frame is from
Clifton Fluid Power, Inc. module made in-house).
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Testing (cont).
14/8 G2 assembly after squeezing.
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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 wont change, while we continue to
  develop others).

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14/8 Caltech assembly
14/8 Caltech assembly (lanthanum chromite
step-heater)
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14/8 Caltech assembly thermal profile
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14/8 G2 assembly
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8/3 assembly
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8/3 assembly (cont) room temperature calibration.
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8/3 assembly (cont.) Thermal profile.
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8/3 assembly (cont.) Effect of temperature on
pressure.
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10/5 Tami assembly
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10/5 Tami assembly (cont.) Pressure calibration
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10/5 assembly (cont.) Effect of temperature on
pressure