量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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The integration of the 175 MHz RF system and the Radio Frequency Quadrupole (RFQ) Linac was performed at the facility of the Linear IFMIF Prototype Accelerator (LIPAc) in Rokkasho (Japan). During the integration, the RF system was adapted for dealing with an unexpected high reflection from the RFQ and a new request of a short pulse and high repetition rate operation, which was necessary for speeding up the RF conditioning of the RFQ. The reflection from the eight-port RFQ to the eight RF chains of the RF system has been studied theoretically and analyzed with measurements during the RF conditioning. The adapting of the RF system and understanding of the reflection from the RFQ boosted the progress of the RF conditioning, and the RFQ was conditioned up to a deuteron acceleration level (~560 kW in the RFQ) at 300 μs/1 Hz, which allowed us to start a deuteron beam commissioning at the low duty cycle. It was also confirmed that the amplitude control of the RF system was properly adjusted to a beam loading of 45 mA deuteron beam.
会議概要（会議名, 開催地, 会期, 主催者等）
28th IEEE Symposium on Fusion Engineering (SOFE2019)
Integration of 175 MHz LIPAc RF system and RFQ Linac for Beam Commissioning
