Page 1 of 24 Designing multi-anvil assemblies: The COMPRES cell assembly project Kurt Leinenweber.

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Presentation transcript:

Page 1 of 24 Designing multi-anvil assemblies: The COMPRES cell assembly project Kurt Leinenweber

Page 2 of 24

Page 3 of 24 Challenges: Thermocouple has to work wellThermocouple has to work well Wide range of P and T desirable for each assemblyWide range of P and T desirable for each assembly Easy to assembleEasy to assemble Not expensiveNot expensive Specs have to be repeatable from year to year (well-documented)Specs have to be repeatable from year to year (well-documented)

Page 4 of 24 Five sizes of octahedra - 8 mm, 10 mm, 14 mm, 18 mm and 25 mm - used in the COMPRES assemblies.

Page 5 of 24 The octahedra showing the sample holes already molded in.

Page 6 of 24 Gasketing Gasket setup using pre-cut paper and pre-milled gaskets, shown on the bottom 4 cubes of the “nest.”

Page 7 of 24 Gasketing (cont.) Pre-cut paper that is used to position the gaskets.

Page 8 of 24 Gasketing (cont.) ASU’s shop foreman, Rick Flubacher, and an automated mill.

Page 9 of 24 Trial milling of pyrophyllite gaskets on a programmable mill. Gasketing (cont.)

Page 10 of 24 COMPRES machinist, Brian Nagy, and the COMPRES automated lathe. Gasketing (cont.)

Page 11 of 24 Cutting thermocouple slots in a lanthanum chromite sleeve for the 8/3 assembly on the automated lathe. Assembly

Page 12 of 24 Rhenium furnace (size 5.4 mm by 8 mm) cut using wire EDM (Electrical Discharge Machining), for the 8/3 assembly. Assembly (cont.)

Page 13 of 24 The 8/3 assembly with the lanthanum chromite sleeve and the rhenium furnace in place. Assembly (cont.)

Page 14 of 24 Beam path (green) through the 8/3 assembly (courtesy of Emmanuel Soignard). Modification for x-ray

Page 15 of 24 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. Modification for x-ray (cont.)

Page 16 of 24 “COMPRES care packages” ready for shipping. Testing

Page 17 of 24 “Big blue” multi-anvil at ASU (frame is from Clifton Fluid Power, Inc.; module made in-house). Testing (cont).

Page 18 of 24 14/8 “G2” assembly after squeezing. Testing (cont).

Page 19 of 24 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).

Page 20 of 24 14/8 “Caltech” assembly (lanthanum chromite step-heater) 14/8 “Caltech” assembly

Page 21 of 24 14/8 “Caltech” assembly thermal profile

Page 22 of 24 14/8 “G2” assembly

Page 23 of 24 8/3 assembly

Page 24 of 24 8/3 assembly (cont): room temperature calibration.

Page 25 of 24 8/3 assembly (cont.): Thermal profile.

Page 26 of 24 8/3 assembly (cont.) Effect of temperature on pressure.

Page 27 of 24 10/5 “Tami” assembly

Page 28 of 24 10/5 “Tami” assembly (cont.): Pressure calibration

Page 29 of 24 10/5 assembly (cont.): Effect of temperature on pressure