Micro-bunching of the AGS slow extracted beam for a rare kaon decay search

The AGS slow extracted beam (SEB) must be chopped with 250 ps bursts every 40 ns to permit time-of-flight (ToF) measurement of the secondary K⁰ beam. Standard techniques to produce this level of bunching would require excessive RF voltage, thus we have developed a "micro-bunching" technique of extracting the beam as it is forced between empty RF buckets. A specification of the required RF system will be given. Four-dimensional model simulations of particle dynamics for the planned RF and extraction systems will be shown. Simulations of previous tests along with the test measurements are also presented. Measurement of tight bunching requires dedicated instrumentation. The design of a detector system to measure bunch widths and the extinction factor between bunches will be given; considerations include the various particles produced and transported, timing precision and background