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TY - CONF AU - Shane, R. AU - Lidia, S.M. AU - Liu, Z. AU - Nash, S. AU - Villari, A.C.C. AU - Yair, O. ED - Schaa, Volker RW TI - Bunch Shape Measurements at the National Superconducting Cyclotron Laboratory ReAccelerator (ReA3) J2 - Proc. of IBIC2016, Barcelona, Spain, Sept. 13-18, 2016 C1 - Barcelona, Spain T2 - International Beam Instrumentation Conference T3 - 5 LA - english AB - The longitudinal bunch shape of a reaccelerated heavy-ion beam at the National Superconducting Cyclo-tron Laboratory's (NSCL) ReA3 beamline was measured using an Ostrumov-type bunch-shape monitor. The phase of the last accelerating cavity was varied to change the bunch length, while the energy was kept constant by adjusting the amplitude of the voltage on the cavity. Two peaks were observed in the longitudinal projection of the bunch shape distribution. The widths of the two peaks did not vary much when the cavity phase was changed, while the peak separation decreased to the point that the two peaks became unresolvable as the bunching was increased. The relative amplitudes of the two peaks was very sensitive to tuning parameters. This, coupled with a lack of information about the transverse profile of the bunch, complicated the analysis and made a simple width assignment difficult. Measurements were also made with an MCP timing grid for comparison. The general shape and trend of the two data sets were similar; however, the widths measured by the timing grid were about 30-50% smaller. PB - JACoW CP - Geneva, Switzerland SP - 772 EP - 774 KW - cavity KW - timing KW - background KW - electron KW - bunching DA - 2017/02 PY - 2017 SN - 978-3-95450-177-9 DO - 10.18429/JACoW-IBIC2016-WEPG54 UR - http://jacow.org/ibic2016/papers/wepg54.pdf ER -