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TY - CONF AU - Tseng, F.H. AU - Chen, C.H. AU - Chen, J.Y. AU - Chiu, P.C. AU - Huang, C.H. AU - Kuo, C.-C. AU - Liang, C.C. AU - Liao, C.Y. AU - Liu, Y.-C. AU - Tsai, H.-J. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Optics Calibration and Measurement for Low Alpha Lattices in TPS Storage Ring J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - In order to provide short-pulse radiation for pump-probe experiments and coherent radiation for THz/IR measurements, we develop low alpha lattices to reduce the momentum compaction factor from nominal operation values 2.4*10⁻⁴ to 2.6*10-5 or lower. The corresponding bunch length at 2.8 MV RF voltage and zero current are from 10.78 ps to 3.55 ps or less. In the low alpha operations, the bunch lengthening as a function of bunch current, the orbit drift and noise enhancements as well as rf stability effect are observed. In this report we will present our studies on the lattice design, optics correction, beam parameters measurements and alpha measurements. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3343 EP - 3345 KW - lattice KW - emittance KW - optics KW - coupling KW - operation DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPAK054 UR - http://jacow.org/ipac2018/papers/thpak054.pdf ER -