C -band disk-loaded-type accelerating structure for a high acceleration gradient and high-repetition-rate operation

T. Sakurai, H. Ego, T. Inagaki, T. Asaka, D. Suzuki, S. Miura, Y. Otake

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A high-acceleration-gradient linear accelerator (LINAC) for an x-ray free electron laser (XFEL) offers the advantages of a short accelerator length and low construction costs. In addition, the high pulse repetition rate of the LINAC, which can drive multiple x-ray beam lines, provides additional user opportunities for experiments involving XFEL. A C-band disk-loaded-type accelerating structure was developed to achieve a high acceleration gradient of >50 MV/m and an rf-pulse repetition rate of 120 pps, which is twice as high as that of the XFEL facility, SACLA (60 pps). The structure has a quasiconstant gradient and a traveling wave type with an accelerating mode of TM01-2π/3. To reduce the surface electric fields, we employed a cross section with an ellipsoidal curvature around an iris aperture. The accelerating structure was manufactured for SACLA. High-power rf conditioning was conducted to investigate its performance. Owing to the conditioning, the acceleration gradient reached a value of more than 50.1 MV/m. The structure was operated without any serious issues at a repetition rate of 120 pps. The accelerating structures were installed in the dedicated accelerator for EUV-FEL at SACLA beam line-1. Finally, we obtained accelerated electron beams with the structures operated at an acceleration gradient of 41.4 MV/m.

Original languageEnglish
Article number042003
JournalPhysical Review Accelerators and Beams
Issue number4
Publication statusPublished - 2017 Apr 19
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces


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