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TY - CONF AU - Zhang, T. AU - Li, W. AU - Shang, L. AU - Wang, L. AU - Wu, C.-F. ED - Schaa, Volker RW ED - Petit-Jean-Genaz, Christine ED - Ko, In Soo ED - Kim, Dong Eon ED - Kim, Kyung Sook TI - Preliminary Study for the HLS Variable Pulse Length Storage Ring by Two Harmonic Cavities J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - The 4th harmonic cavity is successfully used in HLS II to increase the beam lifetime and suppress the beam instability now. At the future, a scheme of the two higher harmonic cavities may be applied in Hefei light source for a variable electron pulse length storage ring (HLS VSR). With optimal RF system parameters, 45 ps long bunches and 6 ps short bunches may be stored simultaneously in the HLS storage ring. The ratio of the bunch number for 45 ps to the one for 6 ps is 1:2. Particle tracking calculations are performed to simulate the longitudinal phase space of the new system and to track the process of shortening bunches with Elegant Software. Moreover, a tracking simulation code for RF systems is developed in MALAB to study transient beam loading which affects bunch length, phase stability, and longitudinal muti-bunch oscillation for different fill patterns. In the end, the preliminary design of the two harmonic cavities for longitudinal bunch focusing is given. PB - JACoW CP - Geneva, Switzerland SP - 2802 EP - 2804 KW - cavity KW - beam-loading KW - storage-ring KW - synchrotron KW - electron DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-WEPOR058 UR - http://jacow.org/ipac2016/papers/wepor058.pdf ER -