The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Tanaka, O. AU - Nakamura, N. AU - Obina, T. AU - Tsuchiya, K. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - Impedance Evaluation of PF In-Vacuum Undulator (IVU) with Theories and Simulations and Experimental Confirmation of them by the Tune Measurement J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - Four In-Vacuum Undulators (IVU) were recently installed to Photon Factory (PF) at KEK. The estimate of their impedance and kick factors is a very important issue, because they could considerably increase the total impedance of PF. Moreover, the coupling impedance of the IVUs could lead to the beam energy loss, changes in the bunch shape, betatron tune shifts and, finally, to the various beam instabilities. Using the simulation tool (CST Particle Studio), longitudinal and transverse impedances of the IVUs were evaluated and compared to analytical formulas and measurement results. The study provides guidelines for mitigation of unwanted impedance, for an accurate estimate of its effects on the beam quality and beam instabilities and for the impedance budget of a newly designed next-generation machine which has many IVUs and small-aperture beam pipes. PB - JACoW Publishing CP - Geneva, Switzerland SP - 160 EP - 165 KW - ion KW - impedance KW - simulation KW - undulator KW - vacuum DA - 2018/06 PY - 2018 SN - 978-3-95450-206-6 DO - 10.18429/JACoW-FLS2018-THP1WB02 UR - http://jacow.org/fls2018/papers/thp1wb02.pdf ER -