Abstract
We have developed an initial-beam-loading compensation system by a new compensation method, where the system modulates the phase and amplitude of a low-level rf signal simultaneously, thereby optimizing a high-power rf waveform fed to an accelerating structure to compensate the beam energy spread. This compensation system is very compact and can easily be installed in and removed from a klystron system. This system was used in a beam test performed in the 125 MeV electron linac of the Laboratory for Electron Beam Research and Application in Nihon University. Experimental results demonstrate that this system effectively corrects the beam energy spread due to the initial-beam-loading effect. The new compensation method is expected to be effective in the compensation of energy spread in high-intensity and long-pulse beams in electron linacs.
Highlights
In high-intensity electron linacs, a long bunch train is accelerated on a long rf pulse
We have developed an initial-beam-loading compensation system by a new compensation method, where the system modulates the phase and amplitude of a low-level rf signal simultaneously, thereby optimizing a high-power rf waveform fed to an accelerating structure to compensate the beam energy spread
We present a brief introduction of the electron linac at the Laboratory for Electron Beam Research and Application (LEBRA) where the beam test was performed
Summary
In high-intensity electron linacs, a long bunch train is accelerated on a long rf pulse In such a case, the negative longitudinal wake potential increases along the bunch train during one filling time of an accelerating structure, and it causes energy spread within a beam pulse. The initial-beam-loading effect can be compensated for to a certain extent by using an energy compression system or adjusting the timing of the injection of the beam into the accelerating structure. These methods are not sufficiently effective for a large energy spread of the order of several tens of percent.
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