| Paper | Title | Other Keywords | Page |
|---|---|---|---|
| MOPMB068 | Loading Test of Hom Dampers for Superconducting Cavities for High Current at Superkekb | HOM, cavity, SRF, operation | 271 |
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| SuperKEKB is an e⁻e⁺ collider, which is an upgraded accelerator of KEKB with the aim to increase the luminosity by more than one order. The superconducting cavities are used in the electron ring. The superconducting cavities were designed as a HOM-damped structure for KEKB and were operated up to 1.4 A in KEKB. However, the design storage current of the electron ring for SuperKEKB is 2.6 A, which is about twice the achievement current of KEKB. The HOM power is estimated to increase from 16 kW, which is the performance value in KEKB, to over 35 kW. This large load is unacceptable for the ferrite HOM dampers mounted on both sides of the cavity. As a countermeasure, duct type SiC HOM dampers are inserted between the cavities. The HOM damper load tests were performed during normal beam operation with a maximum current of 1.1 A. The load on the downstream ferrite HOM damper decreased due to the HOM power absorbed by the upstream SiC damper. In addition, the load was found to be dependent on the beam filling pattern. We will present the results and discussion of beam tests on the loading of HOM dampers and the dependence on the beam filling pattern in SuperKEKB. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB068 | ||
| About • | Received ※ 18 June 2023 — Revised ※ 23 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 30 June 2023 | ||
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| TUPTB062 | RF Measurements of the 3rd Harmonic Superconducting Cavity for a Bunch Lengthening | cavity, niobium, target, MMI | 565 |
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The brightness can be increased by minimizing the emittance in the light source, but the reduced emittance also increases the number of collisions of electrons in the beam bunch. Therefore, the bunch lengthening by using the 3rd harmonic cavity reduces the collisions of electrons and increases the Touschek lifetime. Since the resonant frequency of the main RF cavity is 500 MHz, the resonant frequency of 3rd harmonic cavity is selected as 1500 MHz. The prototype cavity is a passive type in which a power coupler is not used, and power is supplied from the beam. The operating temperature is 4.5 K, which is a superconducting cavity. The elliptical double-cell geometry was selected to increase the accelerating voltage of the cavity and reduce power losses. Based on this design, three niobium cavities are fabricated and tested. In this paper, we present the RF measurement results of the 3rd harmonic cavity at room temperature.
*3rd harmonic cavity *4th generation storage ring |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB062 | ||
| About • | Received ※ 12 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 13 July 2023 | ||
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| WEPWB043 | Nb3Sn Vapor Diffusion Coating System at SARI: Design, Construction, and Commissioning | cavity, vacuum, niobium, MMI | 655 |
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| This paper describes the design of a coating system for the preparation of a superconducting radio-frequency cavity with Nb3Sn thin films. The device consists of a coating chamber made of pure niobium, a vacuum furnace for heating the coating chamber, a superconducting cavity bracket and two crucible heaters. The chamber is vacuum isolated from the furnace body to protect the superconducting cavity from contamination during the coating process. The device has been built and commissioned, which could be used for Nb₃Sn coating of a 1.3 GHz single-cell superconducting cavity in future. | |||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB043 | ||
| About • | Received ※ 19 June 2023 — Revised ※ 22 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 08 July 2023 | ||
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