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and: sjkwon @ postech.ac.kr, Tel: 82-54-279-1204 PLS linac, eleven SLED-type pulse compressors has been operated since 1994. SLEDIS--one of rf pulse compressors, which consists of two high Qvalue resonant cavities, 3 dE3 hybrid coupler and the auxiliary devices such as tuning mechanism and cooling structure. The " u m enerm multiplicabon, Hystron pulse w i w rf pulse compressor input pulse width, output pulse width and cavity filling time of the SLED-type pulse compressor are 1.676, 4.0 us, 3.17 us, 0.83 us and 1.99 ps , respectively. The resonant frequency in the cavities should be t u n 4 by tuning needle with maintaining a temperature compensated structural $mensions. The temperature sensitivity was about 50 KHdC. To hold the cavity hmmg a$& within So, the cavity temperature has to be stable to iO.lfC. In this paper, we describe the effect of temperature stabilizaiion of cavities on the $output wavefoq phase and energy gain. 0-7803-76944/03/$17.00 02003 IEEE 148