The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Shoji, Y. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - De-coherence Study of Betatron Oscillation for the Beam Shape Manipulation J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - In electron storage ring a temporal perturbation to the beam makes spatial structure in a bunch, which emit short X-ray or coherent THz radiation. For this technique of bunch shape manipulation, it is important to reduce unwanted de-coherence of betatron motion, which would break the intended spatial structure. At NewSUBARU, 1.5 GeV storage ring, we kicked the beam using a vertical fast kicker and investigated the de-coherence of betetron oscillation using mainly a dual-sweep streak camera. The largest is the Landau damping by a well-known chromatic tune spread, although the phase spread comes back to zero at after a synchrotron oscillation period. On the other hand, there exists several non-linear effects, which makes accumulation of the oscillation phase spread. These are, horizontal betatron amplitude dependent vertical tune shift, synchrotron oscillation amplitude dependent synchrotron tune shift, non-linear chromaticity, synchrotron oscillation chromaticity (non-symmetry of rf bucket), longitudinal radiation excitation process, and others. The tuning knobs we had was some sets of non-linear magnets up to octupole and the rf voltage. PB - JACoW CP - Geneva, Switzerland SP - 3026 EP - 3028 KW - synchrotron KW - betatron KW - lattice KW - target KW - radiation DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-THPRO065 UR - http://jacow.org/ipac2014/papers/thpro065.pdf ER -