Speaker
Description
At the J-PARC LINAC, the RF sources and monitoring systems have historically utilized different reference frequencies and its distribution system. As a result, it has been difficult to directly compare the phase of the beam, measured via monitoring systems, with the cavity pickup RF signals. Meanwhile, the phase drift caused by environmental factors such as temperature and humidity has become a significant issue, as it strongly affects the output momentum. This has highlighted the need for a system that can monitor the relative phase between the beam and the RF. However, the development of new monitors and readout devices is difficult due to budget constraints. To address this, we have investigated a method to monitor the phase drift by estimating beam loading inferred on the difference in the input RF waveforms to the cavity with and without beam. While the absolute value of the relative phase cannot be trusted due to uncertainties in the directional coupler and cavity parameters, the phase variation can be reliably used for monitoring purposes. In this paper, we present the advantages of this monitoring approach based on beam test results and analysis of archived data.
| Abstract Category | Measurement and Control |
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