Method and device for homogenizing glass

A device for homogenizing a cylindrical blank composed of glass having a cylindrical outer surface which extends along a longitudinal axis of the blank over a length of the blank between a first end face and a second end face, comprising:

• (a) a supporting and rotating means with a first supporting element for the mounting and rotating of the first end face of the blank at a first rotational speed, and a second supporting element for the mounting and rotating of the second end face of the blank at a second rotational speed, wherein the first and the second supporting element define a working distance (D) and a working axis (A) of the supporting and rotating means;
• (b) a heating means for softening a longitudinal section of the blank;
• and
• (c) a displacement means for generating a relative motion between heating means and blank along the working axis (A),
• wherein the heating means comprises a heat source and a thermal radiation dissipator, wherein the thermal radiation dissipator has a lateral dimension in the direction of the working axis (A) which is smaller than the working distance (D).