Characterizing transverse beam dynamics at the APS storage ring using a dual-sweep streak camera.
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 {micro}s apart) are recorded in a single image, providing rich information about the unstable beam. These include the amplitude of the oscillation ({approximately}0.0 at the head of the train and {approximately}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 ({+-}1.8mm) and direction of the kick, and the subsequent decoherence ({approximately} 500 turns) and damping ({approximately} 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.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10694
- Report Number(s):
- ANL/ASD/CP-95930; TRN: US0103805
- Resource Relation:
- Conference: Beam Instrumentation Workshop (BIW'98), Palo Alto, CA (US), 05/04/1998--05/07/1998; Other Information: PBD: 27 May 1998
- Country of Publication:
- United States
- Language:
- English
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