Development of the superconducting rf 2-cell cavity for cERL injector at KEK

Watanabe, K.; Noguchi, S.; Kako, E.; Umemori, Kensei; Shishido, T.

doi:10.1016/j.nima.2013.02.035

Cited by 19 publications

(15 citation statements)

References 1 publication

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“…To obtain the current and field distribution, we solve the London equation, λ 2 A ′′ − A = 0, where λ = λ 1 at 0 ≤ x ≤ d and λ = λ 2 at x > d. Its solution is given by the same one as Eqs. ( 19) and (20). Then the current densities at the surface and S-S boundary can be obtained by using J = −A/µ 0 λ 2 and are given by…”

Section: Theoretical Field Limitmentioning

confidence: 99%

“…In the present day, the peak surface magnetic field around B 0 ≃ 150 mT has been commonly achieved by using the set of modern surface-preparation techniques: electropolishing followed by a heat treatment for hydrogen degassing [3,4], high-pressure rinsing [5,6,7], clean assembly [8], low temperature baking [9,10,11,12], and local grind combined with optical inspection technique [13,14,15,16,17,18]. Some laboratories have achieved [19,20], where B are the lower critical field and the thermodynamic critical field, respectively. Further high fields, however, would not be expected because the present record field is thought to be close to the theoretical field limit, namely, the superheating field B ).…”

Section: Introductionmentioning

confidence: 99%

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Multilayer coating for higher accelerating fields in superconducting radio-frequency cavities: a review of theoretical aspects

Kubo¹

2016

Supercond. Sci. Technol.

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Section: Theoretical Field Limitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multilayer coating for higher accelerating fields in superconducting radio-frequency cavities: a review of theoretical aspects

Kubo¹

2016

Supercond. Sci. Technol.

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“…This technique is demonstrated in a high-performance cERL injector 59 , which consists of a 500 kV photo cathode DC gun 60 – 62 and three 2-cell SRF cavities 63 , 64 . The cERL injector can produce electron bunches with a repetition rate of 1.3 GHz and bunch charges from a few fC to pC.…”

Section: Methodsmentioning

confidence: 99%

Measurement of bunch length and temporal distribution using accelerating radio frequency cavity in low-emittance injector

Hwang

Miyajima

Honda

et al. 2020

Sci Rep

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We demonstrate an experimental methodology for measuring the temporal distribution of pico-second level electron bunch with low energy using radial electric and azimuthal magnetic fields of an accelerating ($$\hbox {TM}_{01}$$ TM 01 mode) radio frequency (RF) cavity that is used for accelerating electron beams in a linear accelerator. In this new technique, an accelerating RF cavity provides a phase-dependent transverse kick to the electrons, resulting in the linear coupling of the trajectory angle with the longitudinal position inside the bunch. This method does not require additional devices on the beamline since it uses an existing accelerating cavity for the projection of the temporal distribution to the transverse direction. We present the theoretical basis of the proposed method and validate it experimentally in the compact-energy recovery linac accelerator at KEK. Measurements were demonstrated using a 2-cell superconducting booster cavity with a peak on-axis accelerating field ($$E_0$$ E 0 ) of 7.21 MV/m.

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“…Continuous research on superconducting radio-frequency (SRF) accelerator cavities composed of Nb over the past several decades has led to increasingly improved SRF cavity performances [1]. In recent years, a maximum surface magnetic field of ~200 mT [2,3] has been reported upon the application of various surface treatments such as local grinding combined with internal surface inspection [4,5], electropolishing, subsequent annealing for hydrogen degassing, high-pressure rinsing, and low-temperature baking of the cavity [6] (see also Refs. [7,8] for newly developed surface processing technologies).…”

Section: Introductionmentioning

confidence: 99%

Vortex penetration field measurement system based on third-harmonic method for superconducting RF materials

Ito

Hayano

Kubo

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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We develop a lower critical field (H c1 ) measurement system using the third-harmonic response of an applied AC magnetic field from a solenoid coil positioned above a superconducting sample. Parameter H c1 is measured via detection of the third-harmonic component, which drastically changes when a vortex begins to penetrate the superconductor with temperature increase. The magnetic field locally applied to one side of the sample mimics the magnetic field within superconducting radio-frequency (SRF) cavities and prevents edge effects of the superconducting sample. With this approach, our measurement system can potentially characterize surface-engineered SRF materials such as Superconductor-Insulator-Superconductor multilayer structure (S-I-S structure). As a validation test, we measure the temperature dependence of H c1 of two high-RRR bulk Nb samples and obtain results consistent with the literature. We also confirm that our system can apply magnetic fields of at least 120 mT at 4-5 K without any problem of heat generation of the coil. This field value is higher than those reported in previous works and makes it possible to more accurately estimate H c1 at lower temperatures.

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Development of the superconducting rf 2-cell cavity for cERL injector at KEK

Cited by 19 publications

References 1 publication

Multilayer coating for higher accelerating fields in superconducting radio-frequency cavities: a review of theoretical aspects

Multilayer coating for higher accelerating fields in superconducting radio-frequency cavities: a review of theoretical aspects

Measurement of bunch length and temporal distribution using accelerating radio frequency cavity in low-emittance injector

Vortex penetration field measurement system based on third-harmonic method for superconducting RF materials

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