Progress of 2-Cell Cavity Fabrication for Cornell ERL Injector

Geng, Rongli; Barnes, P.; Liepe, Matthias; Medjidzade, V.; Seaman, Amanda C.; Sears, J.; Sherwood, N.; Shemelin, Valery

doi:10.1109/pac.2005.1591780

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…The project is currently in the phase of prototyping its injector, which consists of a DC photo-emission gun, a normal conducting copper buncher cavity, and a booster cryomodule hosting five 2-cell superconducting RF (SRF) cavities [1] [2].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and performance of superconducting RF cavities for the cornell ERL injector

Geng

Barnes

Clasby

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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Six 1300 MHz superconducting niobium 2-cell cavities are manufactured in-house for the prototype of the Cornell ERL injector to boost the energy of a high current, low emittance beam produced by a DC gun. Designed for high current beam acceleration, these cavities have new characteristics as compared to previously developed low-current cavities such as those for TTF. Precision manufacture is emphasized for a better straightness of the cavity axis so as to avoid unwanted emittance dilution. We present the manufacturing, processing and vertical test performance of these cavities. We also present the impact of new cavity characteristics to the cavity performance as learnt from vertical tests.

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Section: Introductionmentioning

confidence: 99%

Fabrication and performance of superconducting RF cavities for the cornell ERL injector

Geng

Barnes

Clasby

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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“…The effective accelerating gradient was improved by a factor of 1.2, for a phase advance equal to 105°f or TW, because of the increased transit time factor in the cavity. In order to understand the maximum gain in accelerating gradient, the optimized traveling wave structure was compared with the SW re-entrant structure with 70 mm aperture, where the previous record values of gradient 54 MV m −1 have been achieved [7,14]. A higher accelerating gradient (59 MV m −1 ) was obtained in the Re-entrant structure with 60 mm aperture, but it was not taken as a reference because it does not allow us to build a nine-cell structure according to field flatness degradation issues.…”

Section: Regular Cell Parameter Optimizationmentioning

confidence: 99%

“…For example, large grain and monocrystal materials are currently being considered [5]; and (3) improvement of the structure shape in order to reduce the surface magnetic field for a given accelerating gradient. There are two ways to decrease the magnetic field: (1) develop a homogeneous magnetic field distribution over the cavity surface (low-loss structure [6] and Re-entrant structure [7]) and (2) improvement of the beam interaction with the structure, increasing the transit time factor (Re-entrant structure [7]).…”

Section: Introductionmentioning

confidence: 99%

A high gradient test of a single-cell superconducting radio frequency cavity with a feedback waveguide

Kostin

Avrakhov

Kanareykin

et al. 2015

Supercond. Sci. Technol.

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The most severe problem of the international linear collider (ILC-type) is its high cost, resulting in part from the enormous length of the collider. This length is determined mainly by the achievable accelerating gradient in the RF system of the collider. In current technology, the maximum acceleration gradient in superconducting (SC) structures is determined mainly by the value of the surface RF magnetic field. In order to increase the gradient, a superconducting traveling wave accelerating (STWA) structure is suggested. Utilization of STWA structure with small phase advance per cell for future high energy linear colliders such as ILCs may provide an accelerating gradient 1.2–1.4 times larger [] than a standing wave structure. However, STWA structure requires a feedback waveguide for power redirecting from the end of the structure back to the front end of accelerating structure. Recent tests of a 1.3 GHz model of a single-cell cavity with waveguide feedback demonstrated an accelerating gradient comparable to the gradient of a single-cell ILC-type cavity from the same manufacturer []. In the present paper, high gradient test results are presented.

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“…Two main alternative cavity designs have been focused on: a re-entrant design which is being undertaken at Cornell University and a design at KEK based on a low-loss cavity shape known as the "Ichiro" cavity [7]. In both designs, increasing the accelerating gradient leads to a concurrent increase in the maximum magnetic field on the walls of the cavity and this results in a quenching of the superconducting state of the Nb [8]. Re-shaping the cells of the cavities allows the ratio of the peak magnetic field to the accelerating gradient to be reduced compared to that of the baseline TESLA shape.…”

Section: Introductionmentioning

confidence: 99%

Simulation of HOM wakefields in the main linacs of ILC

Jones

Glasman

2007

2007 IEEE Particle Accelerator Conference (PAC)

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We investigate the electromagnetic field (e.m.) excited by a train of multiple bunches in the main superconducting linacs of the ILC. These e.m. fields are represented as a wake-field. Detailed simulations are made for the modes which constitute the long-range wake-field in new high gradient cavities. In particular, we focus our study on the modes in re-entrant cavities. Modes trapped within a limited number of cells can give rise to a significant diminution in the emittance of the beam and we pay particular attention to these modes.

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Progress of 2-Cell Cavity Fabrication for Cornell ERL Injector

Cited by 3 publications

References 3 publications

Fabrication and performance of superconducting RF cavities for the cornell ERL injector

Fabrication and performance of superconducting RF cavities for the cornell ERL injector

A high gradient test of a single-cell superconducting radio frequency cavity with a feedback waveguide

Simulation of HOM wakefields in the main linacs of ILC

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