The Brookhaven National Lab (BNL) Furnace is primarily a vacuum furnace; nevertheless, it can also be reconfigured to run in air or an inert gas. The main disadvantage of running the BNL Furnace in a gas atmosphere is the maximum temperature limitation imposed by its lack of cooling. This system is more robust than the other general use furnace (F-1600C), but has a lower maximum temperature.
Sample visibility of 350o in scattering plane, 20o out of plane
Irradiative heating via a cylindrical element driven by a high voltage AC power
Active Heating/Sample Zone : 6.5 cm diameter x 8.5 cm length
Interlocked alarm system for pressure, and temperature
Pressure relief valve rated to 10 psi has been installed in the system
Sample Temperature Stability: +1oC at 600oC
Sample Holders: A user designed (NIST assistance is available) sample holder compatible with our probes is required. There are two possible sample mounts: A 3/8" diameter copper post with either a 1/4-20 female thread or a M4-0.7 male thread; and a copper base designed to fit our single-crystal sample cans. Ventilated (i.e. non-pressure building) crucible-type holders made of niobium or platinum are ideal; however, special sample mounts can be designed. Any sealed sample holder must be tested off-line at the maximum desired temperature before loading into the furnace to ensure that an over-pressure burst will not occur on the beam line.
Note that the beam center is 152.4 cm (6 inches) above the bottom of the furnace, and the standard mounting post height is 3.5 cm (1 3/8 inches) from the center of the beam.
Any Cd masking MUST be done on the outside of the furnace
Plan ahead. At a minimum it will take 2 hours for the sample to reach 600oC.
Leave time at the end of the experiment to allow the sample cell to cool in order to open the vessel.
Design the experiment with proper sample mounting and ultimate sample temperature requirements in mind.