TY - JOUR
T1 - C -band disk-loaded-type accelerating structure for a high acceleration gradient and high-repetition-rate operation
AU - Sakurai, T.
AU - Ego, H.
AU - Inagaki, T.
AU - Asaka, T.
AU - Suzuki, D.
AU - Miura, S.
AU - Otake, Y.
N1 - Publisher Copyright:
© 2017 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »http://creativecommons.org/licenses/by/3.0/» Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/4/19
Y1 - 2017/4/19
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevAccelBeams.20.042003
DO - 10.1103/PhysRevAccelBeams.20.042003
M3 - Article
AN - SCOPUS:85025137191
VL - 20
JO - Physical Review Accelerators and Beams
JF - Physical Review Accelerators and Beams
SN - 2469-9888
IS - 4
M1 - 042003
ER -