Betatron phase and coupling measurements at the Cornell Electron/Positron Storage Ring

Sagan, D.; Meller, R.; Littauer, R.; Rubin, D.

doi:10.1103/physrevstab.3.092801

Cited by 37 publications

(44 citation statements)

References 8 publications

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“…The individual BPM modules then extract the phase values and use them to reconstruct the drive signals (typically at one of the three normal mode dipole frequencies: horizontal and vertical betatron modes or the synchrotron oscillation mode), which is used to synchronously detect corresponding phase at each BPM station. The synchronous phase measurement is used to determine the phase advance between BPM stations, and hence the phase function of the entire lattice, while the relative phase of horizontal and vertical motion at each BPM is used to extract coupling information [20].…”

Section: Digital Tune Trackermentioning

confidence: 99%

Instrumentation for the study of low emittance tuning and beam dynamics at CESR

et al. 2017

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A: The Cornell Electron-positron Storage Ring (CESR) has been converted from a High Energy Physics electron-positron collider to operate as a dedicated synchrotron light source for the Cornell High Energy Synchrotron Source (CHESS) and to conduct accelerator physics research as a test accelerator, capable of studying topics relevant to future damping rings, colliders and light sources. Some of the specific topics that were targeted for the initial phase of operation of the storage ring in this mode for CESR as a Test Accelerator (CesrTA) included 1) tuning techniques to produce low emittance beams, 2) the study of electron cloud development in a storage ring and 3) intra-beam scattering effects. The complete conversion of CESR to CesrTA occurred over a several year period, described elsewhere [1][2][3]. In addition to instrumentation for the storage ring, which was created for CesrTA, existing instrumentation was modified to facilitate the entire range of investigations to support these studies. Procedures were developed, often requiring coordinated measurements among different instruments [4]. This paper describes the instruments utilized for the study of beam dynamics during the operation of CesrTA. The treatment of these instruments will remain fairly general in this paper as it focusses on an overview of the instruments themselves. Their interaction and inter-relationships during sequences of observations is found in a companion paper describing the associated measurement techniques. More detailed descriptions and detailed operational performance for some of the instrumentation may be found elsewhere and these will be referenced in the related sections of this paper.

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Section: Digital Tune Trackermentioning

confidence: 99%

Instrumentation for the study of low emittance tuning and beam dynamics at CESR

et al. 2017

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“…Quadrupole focusing errors are determined by measuring betatron phase advance at each BPM, using turn-by-turn data acquired while resonantly exciting the beam [15]. Resonant excitation is achieved through a pair of "tune trackers," which are stripline kickers phase locked to the horizontal and vertical betatron tunes [16].…”

Section: Measurement Techniquesmentioning

confidence: 99%

Low-emittance tuning at the Cornell Electron Storage Ring Test Accelerator

Shanks

Rubin

Sagan

2014

Phys. Rev. ST Accel. Beams

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In 2008 the Cornell Electron/Positron Storage Ring (CESR) was reconfigured from an electron/positron collider to serve as a test bed for the International Linear Collider damping rings. One of the primary goals of the CESR Test Accelerator (CesrTA) project is to develop a fast low-emittance tuning method which scales well to large rings such as the ILC damping rings, and routinely achieves a vertical emittance of order 10 pm at 2.085 GeV. This paper discusses the tuning methods developed at CesrTA to achieve lowemittance conditions. One iteration of beam-based measurement and correction requires about 10 min. A minimum vertical emittance of 10.3ðþ3.2= − 3.4Þ sys ðAE0.2Þ stat pm has been achieved at 2.085 GeV. In various configurations and beam energies the correction technique routinely achieves vertical emittance around 10 pm after correction, with rms coupling < 0.5%. The measured vertical dispersion is dominated by beam position monitor systematics. The propagation of uncertainties in the emittance measurement is described in detail. Simulations modeling the effects of magnet misalignments, beam position monitor errors, and the emittance correction algorithm suggest the residual vertical emittance measured at the conclusion of the tuning procedure is dominated by sources other than optics errors and misalignments.

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“…Betatron phase and coupling is determined by resonant excitation of the beam at the transverse normal mode tunes (horizontal and vertical or very nearly depending on coupling) and measuring the amplitude and phase of the signal at each of the tunes at all of the beam position monitors [20]. The result is a measure of the beta function and phase advance at each BPM, and 3 of the 4 components of the 2×2 coupling matrix.…”

Section: Phase and Couplingmentioning

confidence: 99%

CESR Conversion Damping Ring Studies of Electron Cloud Instabilities (CESR-TA)

Rubin¹,

Palmer²

2011

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Betatron phase and coupling measurements at the Cornell Electron/Positron Storage Ring

Cited by 37 publications

References 8 publications

Instrumentation for the study of low emittance tuning and beam dynamics at CESR

Instrumentation for the study of low emittance tuning and beam dynamics at CESR

Low-emittance tuning at the Cornell Electron Storage Ring Test Accelerator

CESR Conversion Damping Ring Studies of Electron Cloud Instabilities (CESR-TA)

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