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@inproceedings{yamanaka:ipac2021-mopab383,
author = {M. Yamanaka and T. Dohmae and K. Enami and H. Inoue and T. Saeki and K. Umemori and Y. Watanabe and K. Yoshida},
% author = {M. Yamanaka and T. Dohmae and K. Enami and H. Inoue and T. Saeki and K. Umemori and others},
% author = {M. Yamanaka and others},
title = {{Pressure Test for Large Grain and Fine Grain Niobium Cavities}},
booktitle = {Proc. IPAC'21},
pages = {1173--1174},
eid = {MOPAB383},
language = {english},
keywords = {cavity, niobium, SRF, experiment, FEM},
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-MOPAB383},
url = {https://jacow.org/ipac2021/papers/mopab383.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB383},
abstract = {{The pressure test was performed using a fine grain (FG) and a large grain (LG) niobium cavities. The cavity is 1.3 GHz 3-cell TESLA-like shape. The cavity was housed in a steel vessel. Water is supplied into the vessel and the cavity outside is pressurized. The applying pressure and the natural frequency of cavity were measured during the pressure test. The FG and LG cavities were deformed greatly and the pressure dropped suddenly at 3.4 MPa and 1.6 MPa, respectively. The frequency shifted up to 3.4 MHz and 1.3 MHz, respectively. There was no leak after the pressure test, so the cavity did not rupture under above pressure. The result of the pressure at LG cavity is less half than that of the FG cavity. We calculated the stress distribution in the structure by applying outer water pressure using a FEM. The maximum stress at cell when above test pressure is applied, are 146 MPa in FG and 73 MPa in LG, respectively. These stresses are similar to tensile strength of niobium specimen measure by ourselves. The result of pressure tests agrees well with the calculation.}},
}