English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We present a novel technique for characterizing transverse beam dynamics using a dual-sweep streak camera. The camera is used to record the front view of successive beam bunches and/or successive turns of the bunches. This extension of the dual-sweep technique makes it possible to display non-repeatable beam transverse motion in two fast and slow time scales of choice, and in a single shot. We present a study of a transverse multi-bunch instability in the APS storage ring. The positions, sizes, and shapes of 20 bunches (2.84 ns apart) in the train, in 3 to 14 successive turns (3.68 μs apart) are recorded in a single image, providing rich information about the unstable beam. These include the amplitude of the oscillation (~0 mm at the head of the train and ~2 mm towards the end of the train), the bunch- to-bunch phase difference, and the significant transverse size growth within the train. In the second example, the technique is used to characterize the injection kicker-induced beam motion, in support of the planned storage ring top-up operation. By adjusting the time scale of the dual sweep, it clearly shows the amplitude ( ∠1.8 mm) and direction of the kick, and the subsequent decoherence (~500 turns) and damping (~20 ms) of the stored beam. Since the storage ring has an insertion device chamber with full vertical aperture of 5 mm, it is of special interest to track the vertical motion of the beam. An intensified gated camera was used for this purpose. The turn-by-turn x-y motion of a single-bunch beam was recorded and used as a diagnostic for coupling correction. Images taken with uncorrected coupling will be presented.

Characterizing transverse beam dynamics at the APS storage ring using a dual-sweep streak camera