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TY - CONF AU - Choi, H. J. AU - Han, J.H. AU - Kang, H.-S. AU - Kim, S.H. AU - Lee, H.-G. AU - Lee, S.B. ED - Schaa, Volker RW TI - Real-Time Measurement of Fluctuations of Building Floor and Installed Devices of Large Scientific Equipment J2 - Proc. of HB2018, Daejeon, Korea, 17-22 June 2018 C1 - Daejeon, Korea T2 - ICFA Advanced Beam Dynamics Workshop T3 - 61 LA - english AB - Several parts that comprise the large scientific equipment should be installed and operated at precise three-dimensional location coordinates X, Y, and Z through survey and alignment to ensure their optimal performance. As time goes by, however, the ground goes through uplift and subsidence, which consequently changes the coordinates of installed components and leads to alignment errors ΔX, ΔY, and ΔZ. As a result, the system parameters change, and the performance of the large scientific equipment deteriorates accordingly. Measuring the change in locations of systems comprising the large scientific equipment in real time would make it possible to predict alignment errors, locate any region with greater changes, realign components in the region fast, and shorten the time of survey and realignment. For this purpose, a WPS's (wire position sensor) are installed in undulator section and a HLS's (hydrostatic leveling sensor) are installed in PAL-XFEL building. This paper is designed to introduce installation status of HLS and WPS, operation status. PB - JACoW Publishing CP - Geneva, Switzerland SP - 362 EP - 365 KW - survey KW - FEL KW - alignment KW - real-time KW - operation DA - 2018/07 PY - 2018 SN - 978-3-95450-202-8 DO - 10.18429/JACoW-HB2018-THA2WD03 UR - http://jacow.org/hb2018/papers/tha2wd03.pdf ER -