  An S band SLED-type pulse compressor has been manufactured by IHEP to
challenge the 100 MW maximum input power, which means the output peak power is
about 500 MW at the phase reversal time. In order to deal with the RF breakdown
problem, the dual side-wall coupling irises model was used. To further improve
the reliability at very high power, amplitude modulation and phase modulation
with flat-top output were taken into account. The RF modulation studies on an
S-band SLED are presented in this paper. Furthermore, a method is developed by
using the CST Microwave Studio transient solver to simulate the time response
of the pulse compressor, which can be a verification of the modulate theory. In
addition, the experimental setup was constructed and the flat-top output is
obtained in the low power tests.
