Speaker
Description
Four Libera Beam Loss Monitors (BLMs) were installed downstream of in-vacuum insertion devices at MAX IV 3 GeV storage ring. The monitors were operated in counting mode, with the loss-detection threshold defined from measurements taken with no stored beam. The BLMs were configured to provide stable, high-dynamic-range loss detection.
A series of controlled studies was performed to compare the loss signatures produced by different operational events, including beam scrape-downs, full beam dumps, full beam injections, and regular top-up cycles. The measurements show that scrape-downs generate the highest localized loss rates, while beam dumps produce almost no detectable signal at the BLM locations. Top-up injections exhibit consistent and repeatable loss patterns, providing a useful benchmark for routine operation. All events were studied with the insertion device gaps both closed and open; a significant decrease in detected losses was observed when the gaps were opened, demonstrating the strong influence of the local lattice and ID configuration on loss propagation.
These results provide a baseline of understanding of local loss behaviour downstream of the IVUs, and will also provide more refined future operational procedures.
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