The first version of a positron converter target will be designed to distribute the heat load by rotating the tungsten target.

Calculate for 1 mm and 2 mm thick Tungsten

Look for Tungsten disks to attach to brushless motor and fit into beam pipe

Properties of Tungsten

Melting Point =

Heat Capacity =

Heat loss due to radiation ( \sigma T^4)

Tungsten Temperature as a function of heat load

The Tungsten heats up when an MeV energy electron impinges its surface. The imperfect vacuum inside the beam pipe does allow some radiative cooling.