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TY - CONF AU - Kumar, A. AU - Abe, K. AU - Dohmae, T. AU - Fajardo, A. AU - Lannoy, N. AU - Michizono, S. AU - Myneni, G.R. AU - Saeki, T. AU - Watanabe, Y. AU - Yamamoto, A. AU - Yamanaka, M. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Lesage, Ana ED - Schaa, Volker R.W. TI - Mechanical Properties of Directly Sliced Medium Grain Niobium for 1.3 GHz SRF Cavity J2 - Proc. of SRF2021, East Lansing, MI, USA, 28 June-02 July 2021 CY - East Lansing, MI, USA T2 - International Conference on RF Superconductivity T3 - 20 LA - english AB - At KEK, research is being conducted to manufacture cost-effective 1.3 GHz superconducting radio frequency cavities based on the fine grain (FG) and large grain (LG) Niobium (Nb) materials. Medium grain (MG) Nb has been proposed and developed as an alternative to the FG and LG Nb, being expected to have better mechanical stability with a cost-effective and clean manufacturing approach. MG Nb has an average grain size of 200 - 300 µm, which is approximately 100 times smaller than the LG Nb, however, there are occasional grains as large as 1-2 mm. As such, it is expected to have isotropic properties rather than the anisotropic properties of LG Nb. In this paper, we will outline the mechanical properties of the directly sliced high RRR MG Nb material (manufactured by ATI), and a comparative study will be presented with respect to FG and LG Nb. Moreover, the viability of MG Nb for the global high-pressure regulation for 1.3 GHz SRF cavity will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 259 EP - 264 KW - cavity KW - niobium KW - SRF KW - cryogenics KW - collider DA - 2022/10 PY - 2022 SN - 2673-5504 SN - 978-3-95450-233-2 DO - doi:10.18429/JACoW-SRF2021-MOPCAV004 UR - https://jacow.org/srf2021/papers/mopcav004.pdf ER -