A vitreous silica crucible has high strength at high temperature, and allows easy taking-out from a susceptor after completion of pulling. In one embodiment a tooling component is removably mountable to a host machine. Furthermore, the structure for dispensing a substance may include a sponge positioned within the internal cavity of the mouth and tongue stud. Prior to dopant diffusion, the substrate may be optionally subjected to liquid phase deposition to deposit a material that allows for patterned doping. The guiding channel and the guiding member are aligned long a direction perpendicular to the top plate, and the guiding channel is boarder than the guiding member. According to a first embodiment, the ignition point is determined in the controlled phase in order to adapt the flow angles of the subsequent current half waves.