FRIB, East Lansing, USA
Strategies for data acquisition and processing will be discussed in the context of the Facility for Rare Isotope Beams (FRIB). Design decisions include selecting and designing electronics hardware, data acquisition cards, firmware design, and how to integrate with EPICS control system. With over 300 diagnostic devices and 16 unique types of devices, timing for synchronous data acquisition is important. Strategies to accelerate development as well as reduce maintenance requirements will be dis-cussed, including using common hardware and firmware whenever possible, and defining a common data report-ing structure for use by most devices. MicroTCA.4 plat-form is used to integrate data acquisition cards, distribute timing information, and machine protection signals.
FRIB, East Lansing, USA
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.
