Abstract
A new model to compensate for the transient beam loading in the CLIC main linac is developed. It takes into account the CLIC specific power generation scheme and the exact 3D geometry of the accelerating structure including couplers. A new method of calculating unloaded and loaded voltages during the transient is proposed and a dedicated optimization scheme of the rf pulse to compensate the transient beam-loading effect is presented. It is demonstrated that the 0.03% limit on the rms relative bunch-to-bunch energy spread in the main beam after acceleration can be reached. The optimization technique has been used to increase the rf to beam efficiency while preserving the CLIC requirements and to compensate for the energy spread caused by the Balakin-Novokhatski-Smirnov damping and transient process in the subharmonic buncher. Effects of charge jitters in the drive and main beams are studied. It is shown that within the 0.1% CLIC specification limit on the rms spread in beams charge the energy spread is not significantly affected.
Highlights
In order to have a luminosity loss of less than 1% at the Compact Linear Collider (CLIC) [1] interaction point, the rms bunch-to-bunch relative energy spread in the main beam must be below 0.03% [2]
A new model to compensate for the transient beam loading in the CLIC main linac has been presented
It takes into account the exact 3D shape of the CLIC accelerating structures including the couplers and the CLIC specific rf pulse generation scheme
Summary
In order to have a luminosity loss of less than 1% at the Compact Linear Collider (CLIC) [1] interaction point, the rms bunch-to-bunch relative energy spread in the main beam must be below 0.03% [2]. An exact analytical rf pulse shape is derived in order to compensate for the transient beam loading This model does not take into account dispersion effects and, cannot be applied directly to CLIC because the narrow bandwidth of the accelerating structure limits the field rise time. A new advanced model which takes into account all of the CLIC drive beam generation steps (injector, delay loop, and combiner rings), bunch response of PETS with the integrated on/off mechanism [9], the rf waveguide network transfer function, and dispersive properties of the accelerating structure is developed to compensate for the transient beam loading in the main linac. N1⁄41 where q is the bunch charge, NB is the number of bunches within the train, and TB is the bunch separation
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