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@unpublished{yamamoto:linac2022-th1pa03, author = {Y. Yamamoto}, title = {{Successful Beam Operation at 33 MV/m in STF-2 Cryomodule at KEK for ILC}}, booktitle = {Proc. LINAC'22}, language = {english}, intype = {presented at the}, series = {International Linear Accelerator Conference}, number = {31}, venue = {Liverpool, UK}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {09}, year = {2022}, note = {presented at LINAC'22 in Liverpool, UK, unpublished}, abstract = {{In STF at KEK, as the operational demonstration of the SRF accelerator for ILC, the STF-2 cryomodules (CM¹⁺CM2a: one and half size CM with 12 cavities) have achieved 33 MV/m as average accelerating gradient estimated from the beam energy with 7 cavities in Mar/2019. After that, one cavity with the lowest performance installed in CM2a was replaced with one nitrogen-infused cavity developed for High-Q/High-G R&D between Japan and US. From Apr/2021, the beam operation started again and those CMs achieved 33 MV/m as average accelerating gradient with 9 cavities including one nitrogen-infused cavity. This is the very important milestone for ILC. In this report, the detailed results will be presented.}}, }