 Fig. 13 Furnace/Cryostat in situ insert for hard x-rays (> 7 KeV) and higher temperature and pressure. Temperature range from 90-1300 K. The insert includes a resistance heater, LN2 cooling loop and water cooling. Either boron nitride or Be sample holders are available. With the Be sample holder pressures to 100 atmospheres may be used. The absorption of the cell limits use to x-ray energies > 7 keV. The cell can be used either in transmission or fluorescent mode or both simultaneously. The holder is shown with a BN cell installed and the parts of a Be cell lying in front. The Be (or BN) cell rides upon the rail on the right and is covered with a soft metal gasket, on the left. The allen head screws are used to tighten the boat riding on the rail into the fixture to obtain a tight seal against the gasket. The gas over the sample passes in and out through holes in the gasket. To reach the highest temperatures the cell is assembled with heat reflectors (one is shown) front and back and the inside of the furnace body is evacuated. To evacuate the furnace body a 75 mm Kapton window is epoxied to the furnace outside of and supported by the Soller slit structure. This protects the thin window of the ion chamber.
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