Bunch length control in the NSLS VUV ring

Biscardi, R.; Kramer, S.L.; Ramirez, G.

doi:10.1016/0168-9002(95)00522-6

Cited by 16 publications

(15 citation statements)

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“…All of these effects can be seen in the VUV bunch shapes (figure 1) and it is the purpose of this paper to describe these influences. Although the first two effects have been reported previously [1], additional information is provided here. The third effect is assessed for the VUV ring for the first time and occupies the majority of this paper.…”

Section: Introductionmentioning

confidence: 98%

Stretched bunch shapes in the NSLS VUV ring

Towne

1999

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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For bunches stretched with a higher-harmonic cavity, longitudinal bunch shapes are influenced by small variations in the potential wells of the buckets of the bunch train. This paper discusses three things that perturb the bunch shapes in the NSLS VUV ring: the ,90 ae (non-optimal) phase of the harmonic cavity maintained by the RF controls [1], higher-order modes (HOM) of the main cavity, and the effect of unfilled buckets on the RF fields in the accelerating modes of the two cavities. The suppression of the lowest-lying HOM in an experiment using RF feedback applied to two HOM damping-probe ports is described and results of calculations of the effect of unfilled buckets are given. Measured bunch shapes are shown and discussed.

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Section: Introductionmentioning

confidence: 98%

Stretched bunch shapes in the NSLS VUV ring

Towne

1999

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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“…This has been done using a fourth harmonic cavity on the NSLS VUV Ring. 20 The rf system in a storage ring both replenishes the energy lost to synchrotron radiation and provides longitudinal focusing of the electron bunches. The stored electrons oscillate about the synchronous phase of the rf, which is that phase a t which the rf voltage equals the energy lost to synchrotron radiation.…”

Section: Lifetimementioning

confidence: 99%

<title>Performance optimization of synchrotron light sources</title>

Safranek

1996

SPIE Proceedings

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This paper will present work done at the NSLS to tailor the electron beam properties so as to maximize the performance of the photon beamlines. The electron beam properties of most importance to photon users are the total stored current, emittance, lifetime, and transverse stability. Recent and planned improvements in each of these properties will be discussed as well as the ultimate limits for each. The discussion of transverse stability will include high frequency motion, which can reduce the effective brightness, as well as slow drift during a fill and fill-to-fill reproducibility.

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“…These studies have shed considerable light on the limiting of these instabilities and highlighted the limits of linearized treatments of coherent modes and frequencies in bunched beams. But nonlinear behavior of bunched beams in which synchrotron frequency spread is introduced for Landau damping and lifetime improvement [6] has been less well studied [7]. This paper describes the results of simulations using the Vlasov-Fokker-Planck (VFP) equation for non-Gaussian bunches and comparisons with observations in the National Synchrotron Light Source (NSLS) vacuum ultraviolet (VUV) ring (Sec.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal measurements and simulations of stretched bunches in the NSLS VUV ring

Towne

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Certain longitudinal instabilities in the stretched bunches of the National Synchrotron Light Source Vacuum UltraViolet ring are described and simulated using a code for the integration of the Vlasov-Fokker-Planck equation (these proceedings). Results for the microwave instability driven by broadband impedance, instability driven by high-É radio-frequency modes, and response functions in stretched bunches, are compared with measurements from the ring.

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Bunch length control in the NSLS VUV ring

Cited by 16 publications

References 1 publication

Stretched bunch shapes in the NSLS VUV ring

Stretched bunch shapes in the NSLS VUV ring

<title>Performance optimization of synchrotron light sources</title>

Longitudinal measurements and simulations of stretched bunches in the NSLS VUV ring

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