Z.Igarashi, K.Nanmo, T.Takenaka, E.Takasaki (KEK)
Various improvements to increase the beam intensity of the KEK-PS for neutrino oscillation experiment have been continued these several years. The limit of the beam intensity is mainly depended on the beam loss in the accelerator or the beam transport line, now. To restrict the beam loss, various beam parameters should be stabilized to keep the same values during long accelerator operation period. To stabilize the beam energy of the 40MeV Proton Linac, the signal from the beam velocity monitor is fed to the phase shifter of the debuncher at the 40MeV beam transport line, then the phase of the field in the debuncher is modulated so as to be in acceleration phase for lower energy beam and to be in deceleration phase for higher energy beam. The beam stabilization system for the KEK 40MeV Proton Linac will be presented in this conference.
 I.Yamane, H.Sato 'Accelerator Development for K2K Long-Baseline Neutrino-Oscillation Experiment,' January, 2000
 Z.Igarashi, K.Nanmo, T.Takenaka and E.Takasaki, 'Velocity Monitor for the KEK 40MeV Proton Linac,' Proc. 1992 Linac Conference., (1992)
 Z.Igarashi, K.Nanmo, T.Takenaka and E.Takasaki, 'A New RF System for the Debuncher at the KEK 40-Mev Proton Linac,' Proc. 1998 Linac Conference., 929 (1998)
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