
346 HIGH POWER MICROWAVES
loss of beam energy. At the designed output power level of 250MW, voltage of 1.3MV, and RF current
of 520A (not the DC current), the peak eld level inthe traveling wave coupler was to be limited to
40MV/cm. In experiments, the maximum power extracted from the traveling wave structure itself was
about 260MW. The highest aggregate power from the two extraction cavities together was 290MW,
with 60MW from the standing wave structure and 230MW from the traveling wave structure. This
latter was reached for a beam voltage and current of 1.3MV and 600A, respectively. Thus, for nominal
input of 1kW, the gain was ...