Design of a Low Loss SRF Cavity for the ILC

Sekutowicz, J.; Ko, K.; Ge, Lixin; Lee, L.; Li, Z.; Ng, Cho-Kuen; Schussman, Greg; Xiao, Liling; Gonin, I.; Khabibouline, T.; Solyak, N.; Morozumi, Y.; Saito, Kenji; Kneisel, P.

doi:10.1109/pac.2005.1591465

Cited by 17 publications

(16 citation statements)

References 2 publications

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“…Table II lists characteristics of three cavity shapes currently being investigated and Fig. 3 shows their cross sections [9]- [11].…”

Section: A Cavity Shapesmentioning

confidence: 99%

Superconducting RF Cavity Development for the International Linear Collider

Yamamoto

2009

IEEE Trans. Appl. Supercond.

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The International Linear Collider is planned as the next energy-frontier electron-positron accelerator. The main linacs of the collider are based on superconducting radio-frequency cavity technology, and will accelerate electron and positron beams up to 250 + 250 GeV at the center-of-mass energy. Based on the Reference Design Report issued in 2007, the ILC Global Design Effort has moved into the Technical Design phase. This paper describes the status of the design, R&D efforts, and plans of the superconducting RF cavity for the ILC.

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“…Table II lists characteristics of three cavity shapes currently being investigated and Fig. 3 shows their cross sections [9]- [11].…”

Section: A Cavity Shapesmentioning

confidence: 99%

Superconducting RF Cavity Development for the International Linear Collider

Yamamoto

2009

IEEE Trans. Appl. Supercond.

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“…The larger end-pipe radius has a significant impact on the third band damping as well as the FM coupling. The required external Q ext for a matched FM coupling for a beam current of 11.8 mA and a gradient of 40 MV/m is about 3.4x10 6 . To obtain such a Qext for the FM mode, the end-pipe radius was initially assumed to be 41 mm to avoid deep intrusion of the center conductor of the FM coupler into the beam pipe.…”

Section: End Group Design Considerationmentioning

confidence: 99%

“…Preliminary studies of the proposed LL cavity have shown unacceptable damping factors [6] for the high R/Q modes in the 3 rd dipole band if the typical TESLA HOM couplers are directly adapted to the design. In the high gradient tests of the 9-cell prototype ICHIRO cavity at KEK, strong multipacting barriers were observed at around 30-MV/m although a single LL cell had achieved a higher gradient.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the low loss SRF cavity for the ILC

Lee

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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The Low-Loss shape cavity design has been proposed as a possible alternative to the baseline TESLA cavity design for the ILC main linacs. The advantages of this design over the TESLA cavity are its lower cryogenic loss, and higher achievable gradient due to lower surface fields. High gradient prototypes for such designs have been tested at KEK (ICHIRO) and TJNAF (LL). However, issues related to HOM damping and multipacting still need to be addressed. Preliminary numerical studies of the prototype cavities have shown unacceptable damping factors for some higher-order dipole modes if the typical TESLA HOM couplers are directly adapted to the design. The resulting wakefield will dilute the beam emittance thus reducing the machine luminosity. Furthermore, high gradient tests on a 9-cell prototype at KEK have experienced multipacting barriers although a single LL cell had achieved a high gradient. From simulations, multipacting activities are found to occur in the end-groups of the cavity. In this paper, we will present the optimization results of the end-groups for the Low-Loss designs for effective HOM damping and alleviation of multipacting.

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“…Note that in this convention, if the wall angle is greater than 90 0 , the cavity geometry is called the re-entrant geometry. Generally, there is a constraint on the maximum value of the wall angle , which is decided by the mechanical considerations, ease of chemical cleaning [12], etc. In our optimization studies, we have explored the case when there is no such constraint on , and found that the performance is improved for higher values .…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Design of a $\beta_{g} = 0.9$ 650-MHz Superconducting-Radio-Frequency Cavity

Jana

Kumar

et al. 2013

IEEE Trans. Appl. Supercond.

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Abstract:We present the electromagnetic design study of a multi cell,  g = 0.9, 650 MHz elliptic superconducting radiofrequency cavity, which can be used for accelerating H -particles in the linear accelerator part of a Spallation Neutron source. The design has been optimized for maximum achievable acceleration gradient by varying the geometry parameters of the cavity, for which a simple and general procedure is evolved that we describe in the paper. For the optimized geometry, we have studied the higher order modes supported by the cavity, and the threshold current for the excitation of the regenerative beam break up instability due to dipole modes has been estimated. Lorentz force detuning studies have also been performed for the optimized design and the calculations are presented to find the optimum location of the stiffener ring to compensate for the Lorentz force detuning.

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Design of a Low Loss SRF Cavity for the ILC

Cited by 17 publications

References 2 publications

Superconducting RF Cavity Development for the International Linear Collider

Superconducting RF Cavity Development for the International Linear Collider

Optimization of the low loss SRF cavity for the ILC

Electromagnetic Design of a $\beta_{g} = 0.9$ 650-MHz Superconducting-Radio-Frequency Cavity

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