  To achieve the extremely high luminosity for colliding electron-positron
beams at the future International Linear Collider (ILC) an undulator-based
source with about 230 meters helical undulator and a thin titanium-alloy target
rim rotated with tangential velocity of about 100 meters per second are
foreseen. The very high density of heat deposited in the target has to be
analyzed carefully. The energy deposited by the photon beam in the target has
been calculated in FLUKA. The resulting stress in the target material after one
bunch train has been simulated in ANSYS.
