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RIS citation export for THPO049: Field Tuning of a Radio-frequency Quadrupole Using Full 3D Modeling

AU  - Morishita, T.
AU  - Hasegawa, K.
AU  - Kondo, Y.
AU  - Oguri, H.
AU  - Otani, M.
ED  - Schaa, Volker RW
ED  - Pei, Guoxi
ED  - Chin, Yong Ho
ED  - Fu, Shinian
ED  - Zhao, Ning
TI  - Field Tuning of a Radio-frequency Quadrupole Using Full 3D Modeling
J2  - Proc. of LINAC2018, Beijing, China, 16-21 September 2018
CY  - Beijing, China
T2  - Linear Accelerator Conference
T3  - 29
LA  - english
AB  - The radio-frequency quadrupole linac (RFQ) is operating in the frontend of the J-PARC linac to accelerates 50 mA negative hydrogen beams from 0.05 MeV to 3 MeV. As a backup, the spare RFQ has been fabricated in 2018. The vane-voltage ramping is adopted to improve the acceleration efficiency so that the cross-sectional shape is adjusted longitudinally to produce the designed voltage distribution. Then, the three-dimensional cavity models including modulations and cutbacks were created in CST Micro-Wave Studio. The vane-base widths and cutback depths were optimized to produce the desired vane-voltage distribution. In the final tuning, the heights of the stub turners were also determined based on the tuner responses obtained from the full 3D models. In this paper, the detailed design process of the cavity dimensions and the result of the low-power measurements are described.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 798
EP  - 801
KW  - rfq
KW  - cavity
KW  - insertion
KW  - linac
KW  - simulation
DA  - 2019/01
PY  - 2019
SN  - 2226-0366
SN  - 978-3-95450-194-6
DO  - DOI: 10.18429/JACoW-LINAC2018-THPO049
UR  - http://jacow.org/linac2018/papers/thpo049.pdf
ER  -