M. KURIKI, H. HAYANO (KEK), V. VOGEL (BINP)
KEK-ATF is studying the low emittance electron beam for the future linear collider. The energy instability of the 1.5 GeV linac has been a problem making the beam injection to the damping ring worse. To solve this problem, we have made various modifications on the electron gun, modulator, klystron etc. For the modulator, we have developed a feed-forward controlled De-Q module. This module compensates the voltage jitter by controlling the de-Q timing because the modulator voltage is strongly correlated to the charge up slope. The energy stability of the linac was examined with and without the feed-forward de-Q. The energy stability was improved by a factor of 3, from 0.6% to 0.2% of itself.
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