Plans for utilizing the Cornell Electron Storage Ring as a test accelerator for ILC damping ring research and development

Palmer, M.; Alexander, J.; Ehrlichman, Michael; Hartill, D. L.; Helms, Richard W.; Rice, D.; Rubin, D.; Sagan, D.; Schächter, Levi; Shanks, James; Tigner, M.; Urban, J.

doi:10.1109/pac.2007.4440131

Cited by 12 publications

(16 citation statements)

References 5 publications

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“…• Relocation of 6 of the 12 CESR-c damping wigglers [8,9] to the L0 straight to enable ultra low emittance CESRTA operation [7]; • Upgraded beam instrumentation to achieve and characterize ultra low emittance beams. This included deployment of a high resolution BPM system [10] and x-ray beam size monitors (xBSMs) for both positron and electron beams [11]; • Addition of vacuum system diagnostics for characterization of local EC growth in a range of vacuum chambers.…”

Section: The Cesr Conversionmentioning

confidence: 99%

“…As noted above the layout of the storage ring was configured during the summer of 2008 for low emittance operation [1,7]. Six of the twelve damping wigglers were moved from the machine arcs to the 18m (L0) straight that became available with the removal of the CLEO HEP detector [8,9].…”

Section: Low Emittance Opticsmentioning

confidence: 99%

“…The first dedicated experiments using the Cornell Electron-Positron Storage Ring (CESR) began in March 2008 at the conclusion of 28 years of colliding beam operations for the CLEO experiment [7]. Two principal goals were specified for the program.…”

Section: Introductionmentioning

confidence: 99%

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

Rubin¹,

Palmer²

2011

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Section: The Cesr Conversionmentioning

confidence: 99%

Section: Low Emittance Opticsmentioning

confidence: 99%

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

Rubin¹,

Palmer²

2011

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“…Further examples include the support structures for the magnets, the temperature stability in the ring tunnel, and the instrumentation for measuring the beam emittance. In addition to ongoing work at the ATF, proposed future test facilities, including CesrTA [22], will be important for validating design choices and tuning techniques.…”

Section: Wexab02mentioning

confidence: 99%

“…Measurements of NEG coatings exposed to beam in a field-free region in PEP-II have shown very promising reduction in secondary yield [36]. Studies are proposed at CesrTA [22] and at KEKB [37] that will directly address the suppression of electron cloud in the particularly difficult wiggler sections.…”

Section: Electron Cloudmentioning

confidence: 99%

Critical r&d issues for the ilc damping rings and new test facilities

Wolski

2007

2007 IEEE Particle Accelerator Conference (PAC)

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The damping rings for the International Linear Collider will be required to accept large beams from the electron and positron sources, and produce highly stable, very low emittance beams for tuning and operation of downstream systems. While many of the parameters for the damping rings are within range of storage rings presently operating, beams meeting the full quality and stability specifications have yet to be demonstrated. We discuss the principal goals of the damping rings research and development program, and the roles that could be played by some proposed future damping rings test facilities. FUNCTIONS OF THE DAMPING RINGSFor the International Linear Collider (ILC) to achieve its luminosity goal of 2×10 34 cm −2 s −1 , the normalised beam emittances at the interaction point must be 10 μm horizontally and no larger than 40 nm vertically [1]. It is not possible to produce either an electron or a positron beam with the necessary quality and stability direct from a source; therefore, the beams in the ILC are stored in damping rings for the 200 ms between linac pulses, during which time radiation damping reduces the emittances by several orders of magnitude. The damping rings also provide the capability of improving beam stability in a number of respects (for example, reducing bunch-to-bunch jitter), and delay the beam so that downstream systems can be tuned to compensate for effects such as variations in bunch charge.The configuration and parameters of the damping rings are highly constrained by the configuration choices made for other systems within the linear collider. For example, the millisecond pulse length of the ILC linacs means that bunch trains must be compressed in the damping rings by injecting and extracting bunches individually; and with only a few nanoseconds between adjacent bunches in the damping rings (in order to keep the circumference within reasonable limits) the kickers for the injection and extraction pose significant technical challenges.A range of studies [2] over recent years, including considerations of beam dynamics, technical issues and costs, have led to a baseline configuration that specifies a single damping ring for each beam (electron and positron), with ring circumference between 6 and 7 km, and beam energy 5 GeV. While every effort has been made to find a configuration that minimises technical risk, the equally important need to reduce costs means that a number of critical R&D issues remain. These include: the fast injection/extraction * Work supported by the Science and Technology Facilities Council through the Cockcroft Institute. † a.wolski@cockcroft.ac.uk kickers; tuning the lattice for ultralow vertical emittance; design and construction of a low-impedance vacuum chamber; fast ion and electron cloud effects. In this paper, we outline the issues associated with each of these items, and indicate the plans leading to the necessary developments or demonstrations in each case. We begin by describing the lattice design studies: given the fundamental role of the lattice in nearl...

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Comparison of electron cloud mitigating coatings using retarding field analyzers

Calvey

Hartung

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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In 2008, the Cornell Electron Storage Ring (CESR) was reconfigured to serve as a test accelerator (CESRTA) for next generation lepton colliders, in particular for the ILC damping ring. A significant part of this program has been the installation of diagnostic devices to measure and quantify the electron cloud effect, a potential limiting factor in these machines. One such device is the Retarding Field Analyzer (RFA), which provides information on the local electron cloud density and energy distribution. Several different styles of RFAs have been designed, tested, and deployed throughout the CESR ring. They have been used to study the growth of the cloud in different beam conditions, and to evaluate the efficacy of different mitigation techniques. This paper will provide an overview of RFA results obtained in a magnetic field free environment.

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Plans for utilizing the Cornell Electron Storage Ring as a test accelerator for ILC damping ring research and development

Cited by 12 publications

References 5 publications

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

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

Critical r&d issues for the ilc damping rings and new test facilities

Comparison of electron cloud mitigating coatings using retarding field analyzers

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