Commissioning of the superconducting RF cavities for the CESR Luminosity Upgrade

Belomestnykh, S.; Barnes, P.; Chojnacki, E.; Ehrlich, R.; Geng, Rongli; Hartill, D. L.; Kaplan, R.; Knobloch, Jens; Nordberg, E.; Peck, S.; Quigley, Peter; Reilley, J.; Rubin, D.; Sears, J.; Veshcherevich, V.

doi:10.1109/pac.1999.795421

Cited by 10 publications

(10 citation statements)

References 5 publications

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“…Proven superconducting RF technology for lepton storage rings exists for only half the envisioned RF gradient [93]. However, design efforts for superconducting RF for continuous operation (CW), for large beam currents and high bunch intensities are underway for ERL and CW-LINAC applications (see for example [94]).…”

Section: Lepton Ringmentioning

confidence: 99%

Deep inelastic electron-nucleon scattering at the LHC

Klein²,

et al. 2006

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The physics, and a design, of a Large Hadron Electron Collider (LHeC) are sketched. With high luminosity, 10 33 cm −2 s −1 , and high energy, √ s = 1.4 TeV, such a collider can be built in which a 70 GeV electron (positron) beam in the LHC tunnel is in collision with one of the LHC hadron beams and which operates simultaneously with the LHC. The LHeC makes possible deep-inelastic lepton-hadron (ep, eD and eA) scattering for momentum transfers Q 2 beyond 10 6 GeV 2 and for Bjorken x down to the 10 −6 . New sensitivity to the existence of new states of matter, primarily in the lepton-quark sector and in dense partonic systems, is achieved. The precision possible with an electron-hadron experiment brings in addition crucial accuracy in the determination of hadron structure, as described in Quantum Chromodynamics, and of parton dynamics at the TeV energy scale. The LHeC thus complements the proton-proton and ion programmes, adds substantial new discovery potential to them, and is important for a full understanding of physics in the LHC energy range.

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Section: Lepton Ringmentioning

confidence: 99%

Deep inelastic electron-nucleon scattering at the LHC

Klein²,

et al. 2006

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“…CESR-B uses a single-cell superconducting cavity design with large beam pipes to propagate the HOMs to external loads [4]. The inherently low R/Q of this shape and the strong coupling to the loads results in very small residual impedances, while the shunt impedance for the fundamental mode is very high [5].…”

Section: Overview Of Current Designsmentioning

confidence: 99%

Design considerations for a second generation HOM-damped RF cavity

Rimmer

Li²

1999

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

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The first generation of strongly HOM-damped RF cavities are now being operated with beam in accelerators with good success. We briefly review these designs and consider some factors in the design of a second generation HOM damped copper RF cavity suitable for use in high current storage rings such as linear collider damping rings, light sources and high luminosity colliders. We consider the problem of broad-band coupling to the higher-order modes (HOMs) and describe how straightforward modifications to the traditional cavity shape can lead to significant simplification of the mechanical design and reduction in cost. We also consider the problem of broad-band HOM damping in a multi-cell cavity.

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“…Operating experience obtained with the first SRF cavity allowed us to introduce several changes in cryomodule design and preparation procedure [1]. As we will see in the next section, as we addressed these problems, CESR continued to set new peak and integrated luminosity records.…”

Section: Srf Cavity Installation and Commissioning Resultsmentioning

confidence: 99%

“…Shortly after its commissioning we were able to reach and exceed 200 kW power delivered to beam by one cavity [1]. Operating with two SRF cavities proved to be easier and more stable than with one SRF and one NRF cavity in the same pair.…”

Section: Cesr Performance and Limitationsmentioning

confidence: 97%

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The high luminosity performance of CESR with the new generation superconducting cavity

Belomestnykh

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

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With the installation of the first SRF cavity in September of 1997, the upgrade of the CESR RF system has begun [1]. This cavity belongs to the new generation of socalled HOM damped cavities designed for high current storage rings [2]. The upgrade is proceeding by replacing one by one old copper cavities with superconducting ones during short machine shutdowns.CESR continues to demonstrate spectacular performance. It operates with 36 bunches in 9 trains of 4 bunches in each beam with total beam current up to 550 mA at the start of fills for high energy physics. In the course of last year both peak luminosity and integrated luminosity per day increased by 67% and are equal now to 8. /day. The latter number corresponds roughly to 43 thousands of B mesons per day. The first superconducting cavity has been in operation in CESR since October of 1997. The cavity operates at accelerating gradients up to 7 MV/m and delivers to the beam maximum RF power of 220 kW through the ceramic window, the record value for superconducting cavities. We found that pulsed power processing without beam is extremely helpful in improving RF window performance. The maximum HOM power extracted from the beam by one cavity is 5.7 kW.Four single-cell HOM damped cavities will eventually support a total beam current of 1 A. Because of the very low impedance of superconducting cavity module, we calculate the longitudinal instability threshold from cavity HOMs to be in excess of 1 A. The second cavity was installed in CESR during October'98 shutdown. The third cavity is already installed in CESR, and its commissioning will start immediately after this conference. The fourth cryomodule is being assembled and is schedule for installation in summer of 1999.

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Commissioning of the superconducting RF cavities for the CESR Luminosity Upgrade

Cited by 10 publications

References 5 publications

Deep inelastic electron-nucleon scattering at the LHC

Deep inelastic electron-nucleon scattering at the LHC

Design considerations for a second generation HOM-damped RF cavity

The high luminosity performance of CESR with the new generation superconducting cavity

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