Omet, M. Araki, H. Dohmae, T. Ito, H. Katayama, R. Umemori, K. Yamamoto, Y. JACoW Publishing Geneva, Switzerland 2673-5504 978-3-95450-234-9 10.18429/JACoW-SRF2023-MOPMB033 English 167-171 cavity SRF laser acceleration site Contribution to a conference proceedings 2023 2023-09 https://doi.org/10.18429/JACoW-SRF2023-MOPMB033 https://jacow.org/srf2023/papers/mopmb033.pdf Our main objective is to achieve as high as possible quality factors Q₀ and maximal accelerating voltages E_{acc} within 1.3 GHz superconducting radio frequency (SRF) cavities. Beside an adequate surface treatment, key to achieve good performance is a proper assembly in the clean room prior cavity testing or operation. In this contribution we present the methods and results of our efforts to get a better understanding of our clean room environment and the particulate generation caused during the assembly work. Furthermore, we present the measures taken to suppress filed emission, followed by an analysis of vertical test results of the last six years.