Device for holding a tubular sio2 blank in an external deposition process and method for manufacturing a tubular sio2 blank

A device for producing a tubular SiO2 blank in an external deposition process, comprising:

• a substrate tube, which has a substrate tube longitudinal axis, a substrate tube length, a first substrate tube end face, a second substrate tube end face, a substrate tube outer lateral surface, a substrate tube inner lateral surface, a substrate tube outer diameter, a substrate tube inner diameter, a substrate tube wall thickness, and a continuous through-opening running coaxially with the substrate tube longitudinal axis, and
• a substrate tube holder, which comprises a clamping device and which is designed to support the substrate tube and to rotate the substrate tube about an axis of rotation running coaxially with or parallel to the longitudinal axis of the substrate tube,
• wherein the substrate tube holder comprises a clamping mechanism which comprises a first pressure unit abutting the first substrate tube end face, a second pressure unit abutting the second substrate tube end face, and at least one force element which is designed to generate an axial contact pressure with a force component acting in the direction of the longitudinal axis of the substrate tube, which force component causes the substrate tube to be clamped between the first pressure unit and the second pressure unit.