  The stability of Al-Mn transition edge sensor (TES) bolometers is studied as
we vary the engineered TES transition, heat capacity, and/or coupling between
the heat capacity and TES. We present thermal structure measurements of each of
the 39 designs tested. The data is accurately fit by a two-body bolometer
model, which allows us to extract the basic TES parameters that affect device
stability. We conclude that parameters affecting device stability can be
engineered for optimal device operation, and present the model parameters
extracted for the different TES designs.
