Speaker
Description
To monitor and analyze the beam loss characteristics during the operation of the Hefei Light Source II (HLS-II), a synchronous bunch-by-bunch measurement system for beam loss and three-dimensional beam position has been developed based on a scintillator detector, a stripline beam position monitor, a high-speed oscilloscope, and the HOTCAP technique. However, the scintillator detector is limited by its resolving time and cannot provide effective bunch-by-bunch beam loss discrimination in high-fill-density storage rings, especially under high loss-rate conditions. To overcome this limitation, a double-exponential pulse trapezoidal shaping algorithm is introduced to resolve piled-up pulses and correct their amplitudes. This system is used to monitor beam losses during both the decay cycle and injection transient process of the HLS-II. During injection transients, a previously unreported evolution pattern was observed, in which beam loss propagates forward from the injected bunch. This phenomenon can be reasonably interpreted in terms of the unbound longitudinal phase-space evolution of particles outside the stable region, together with the longitudinal oscillations of the stored bunches.
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