Sakamoto, N. Hara, H. Imao, H. Kako, E. Kamigaito, O. Kusaka, K. Miyamoto, A. Nakai, H. Okuno, H. Ozeki, K. Sakai, H. Sennyu, K. Suda, K. Umemori, K. Watanabe, T. Watanabe, Y. Yamada, K. Yanagisawa, T. JACoW Publishing Geneva, Switzerland 2226-0366 978-3-95450-194-6 10.18429/JACoW-LINAC2018-WE2A03 English 620-625 WE2A03 cavity vacuum linac cryomodule DTL Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-LINAC2018-WE2A03 http://jacow.org/linac2018/papers/we2a03.pdf An upgrade project of the RIKEN Heavy-Ion Linac, RILAC, is under going, which aims at the further investigation of the super-heavy elements and production of radioactive isotopes for medical applications. In this project, a new superconducting ECR ion source and superconducting RF (SRF) booster linac are being developed and constructed. The SRF linac consists of 10 quarter-wavelength resonator operated at 73 MHz, that are contained in three cryomodules. The construction status, including the first vertical test results, will be given in this paper.