The behavior of a damped kicked rotator subjected to a periodic string of a
symmetric pulses of finite amplitude and width is investigated. We discuss
physical conditions for the results to be independent of the particular cho
ice of the pulse waveform. Analytical (Melnikov analysis) and numerical (Ly
apunov exponents) results show that the extension of chaos in parameter spa
ce reaches a maximum as the pulse width is varied. (C) 2001 Elsevier Scienc
e B.V. All rights reserved.