| Co-Investigator(Kenkyū-buntansha) |
OHSAWA Satoshi High Energy Accelerator Research Organization Accelerator Laboratory, Associate Professor, 加速器研究施設, 助教授 (00150011)
EMONOTO Atsushi High Energy Accelerator Research Organization Accelerator Laboratory, Professor, 加速器研究施設, 教授 (90150010)
OIDE Katsunobu High Energy Accelerator Research Organization Accelerator Laboratory, Professor, 加速器研究施設, 教授 (50150008)
FURUKAWA Kazuro High Energy Accelerator Research Organization Accelerator Laboratory, Research Associate, 加速器研究施設, 助手 (00190132)
KAMITANI Takuya High Energy Accelerator Research Organization Accelerator Laboratory, Research Associate, 加速器研究施設, 助手 (20211857)
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| Research Abstract |
For systematic and precise investigation of beam dynamics in a high-intensity, electron linac for the injector of the B-meson experiment, the following research items have been carried out : (1) improvements of the alignment system, (2) beam-based alignment, (3) measurements of wake-field effects, (4) observation and optimization of bunch profiles, (5) tuning of isochronicity in the 180-degree arc section, (6) beam optimization by a downhill simplex method, (7) optics tuning based on the accomplishments of the above items. In the item (1), light-detection circuits were upgraded so that a data acquisition system by computers was constructed, while in the item (2), beam positions and field centers of magnets were adjusted within a precision of 0.1 mm by observing beam position monitor signals. Quadrupole-wake field effects were directly observed for the first time by measuring beam positions when initial offsets were given (item (3)). The results are in good agreement with a calculation based on the measurements of bunch profiles (4). In the item (5), the isochronicity in the arc section were examined by using a bunch-profile measurement system and accomplished by performing optics corrections, while in the item (6), the positron beam intensity was increased by applying a downhill simplex method to several parameters of the primary electron beam. With all above results, we could carry out the following tasks (item (7)) : (A) development of the software programs for realizing a real-time optics correction, (B) its application to the case for abnormal beam states : prompt beam diagnosis and cures, (C) precise investigation of the quadrupole-wake field effects. Especially in the task (C), it was clarified that the quadrupole-wake field effects show non-linearity as well as x-y coupling phenomena in the orbit. This is the first result obtained in the world.
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