The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Choi, H. J. AU - Baek, S.Y. AU - Kang, H.-S. AU - Kim, S.H. AU - Lee, H.-G. AU - Lee, S.B. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Wire Position System to Consistently Measure and Record the Location Change of Girders Following Ground Changes J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - Several parts that comprise the large scientific device should be installed and operated at the accurate three-dimensional location coordinates where they should be subjected to survey and alignment. The location of the aligned parts should not be changed in order to ensure that the electron beam parameters of PAL-XFEL remain stable and can be operated without any problems. As time goes by, however, the ground goes through uplift and subsidence, which consequently deforms building floors. The deformation of the ground and buildings changes the location of several devices including magnets and RF accelerator tubes, which eventually leads to the alignment errors. Once alignment errors occur with regard to these parts, the electron beam deviates from its course and beam parameters change accordingly. PAL-XFEL has installed the Hydrostatic Leveling System to measure and record the vertical change of buildings and ground consistently and systematically and the Wire Position System to measure the two dimensional changes of girders. This paper is designed to introduce the operating principle and design concept of WPS and discuss the current situation regarding installation and operation. PB - JACoW CP - Geneva, Switzerland SP - 1523 EP - 1526 KW - alignment KW - electron KW - undulator KW - power-supply KW - electronics DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-TUPAB088 UR - http://jacow.org/ipac2017/papers/tupab088.pdf ER -