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@inproceedings{kanesue:ipac2021-mopab350, author = {T. Kanesue and A. Murata and S.M. Trabocchi}, title = {{RF Buncher Cavity for Polarized He-3 Beam at BNL}}, booktitle = {Proc. IPAC'21}, pages = {1090--1092}, eid = {MOPAB350}, language = {english}, keywords = {cavity, simulation, alignment, insertion, booster}, venue = {Campinas, SP, Brazil}, series = {International Particle Accelerator Conference}, number = {12}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {08}, year = {2021}, issn = {2673-5490}, isbn = {978-3-95450-214-1}, doi = {10.18429/JACoW-IPAC2021-MOPAB350}, url = {https://jacow.org/ipac2021/papers/mopab350.pdf}, note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB350}, abstract = {{A 100.625 MHz quarter wave resonator type rf buncher cavity was fabricated for polarized He-3 spin rotator beam line at BNL. This cavity will be installed in the existing EBIS-To-Booster beam line to provide effective voltage of more than 40 kV for 2 MeV/u 3He²⁺ beam. This cavity has a large drift tube inner diameter of 80 mm and small gap length of 5 mm. The buncher consists of 3 sections, which are a cavity main body including drift tube, stem, and inner wall, a lid with a power coupler, and a lid with an inductive tuner. The main body was machined from a bulk copper only by CNC machining. The result of low power test agreed well with rf simulation without any alignment. The difference between measured and calculated resonant frequency was <0.1 %, and measured Q value was 92 % of that in simulation. The cavity rf design and test results will be shown.}}, }