[en] The beam power transmission and deposition in the bending magnet region of the Doublet III neutral injection beamline are examined. Two effects are investigated: the change in power transmitted through the magnet with the calorimeter in and out of the beamline, and the lack of ion power returning to the ion dump. It will be shown that gas evolving and reflecting from the calorimeter raises the gas pressure in the magnet gap to produce charge exchange losses resulting in approx. 13% decrease in neutral beam power passing through the gap. It has also been determined that the missing ion power is deposited on the magnet pole piece shields. The design and operation of the bending magnet are described. The missing neutral power caused by charge exchange losses is discussed. The experimental data are compared with that calculated using two Monte Carlo computer codes, TRAN3D and REION, and it is concluded with an examination of an accident which resulted in the melting of copper louvers bordering the magnet gap