||Because of its compactness and hight heating efficiency, the|
double ellipsoid mirror furnace (DEMF) has been widely used in
the processing of hight-temperature materials,particularly, the
applications in floating zone (FZ) crystal growth. However,
detail heat flux distribution, and thus the temperature
distribution in the sample, in the DEMF is not well understood.
In the present study, a simple model is proposed to describe the
energy distribution in the DEMF. The effects of lamp size,
orientation, and defocusing can all be considered. This model
is also consistent with the point-lamp model as the lamp size is
diminished. The model is futher integrated with a three-
dimensional thermal-capillary FZ model. The effects of various
lamp configurations on temperature distribution and the zone
shape are illustrated. In addition to simulation, a DEMF for FZ
crystal growth is designed and manufactured. Rutile single
crystals are successfully grown in the home-made system.
Futhermore, the axial temperature measurements of a graphite rod
in the system are futher compared with calculated ones.