| Paper | Title | Other Keywords | Page |
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| TUP016 | Quarter-wave Resonator with the Optimized Shape for Quantum Information Systems | cavity, niobium, shielding, factory | 430 |
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Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under SBIR grant DE-SC0018753 Quantum computers (QC), if realized, could disrupt many computationally intense fields of science. The building block element of a QC is a quantum bit (qubit). Qubits enable the use of quantum superposition and multi-state entanglement in QC calculations, allowing a QC to simultaneously calculate millions of computations at once. However, quantum states stored in a qubit degrade with decreased quality factors and interactions with the environment. One technical solution to improve qubit lifetimes and network interactions is a circuit comprised of a Josephson junction located inside of a high Q-factor superconducting 3D cavity. RadiaBeam, in collaboration with Argonne National Laboratory and The University of Chicago, has developed a superconducting radio-frequency quarter-wave resonant cavity (QWR) for quantum computation. Here a 6 GHz QWR was optimized to include tapering of the inner and outer conductors, a toroidal shape for the resonator shorting plane, and the inner conductor to reduce parasitic capacitance. In this paper, we present the results of the qubit cavity design optimization, fabrication, processing and testing in a single-photon regime at mK temperatures. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP016 | ||
| About • | paper received ※ 23 June 2019 paper accepted ※ 30 June 2019 issue date ※ 14 August 2019 | ||
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| TUP072 | The Development of Niobium Sputtering on Copper Cavities at IHEP | cavity, niobium, vacuum, SRF | 613 |
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| A R&D program focusing on niobium sputtering on copper cavities started at IHEP in 2017. Single-cell 1.3 GHz elliptical cavity shape has been initially chosen as sputtering substrate. A magnetron sputtering system have been developed in 2018. In addition, a surface treatment facility to polish the copper substrate before sputtering has been developed and commissioned. This paper will present the Nb/Cu coating activities at IHEP. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP072 | ||
| About • | paper received ※ 19 June 2019 paper accepted ※ 04 July 2019 issue date ※ 14 August 2019 | ||
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| TUP102 | Superconducting Harmonic Cavity for Bunch Lengthening in the APS Upgrade | cavity, HOM, cryomodule, operation | 715 |
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| A superconducting cavity based Bunch Lengthening System is under construction for the Argonne’s Advanced Photon Source (APS) Upgrade. The system will reduce the undesirable effects of Touschek scattering on the beam lifetime by providing bunch lengthening in the longitudinal direction by 2-4 times. The major technical components for the beam-driven 1.4 GHz fourth harmonic superconducting cryomodule are in hand and have been tested. These include a superconducting cavity, cw rf power couplers, a pneumatic cavity slow tuner and beamline higher-order mode absorbers. Initial assembly and engineering testing of the cryomodule is underway. Final integrated testing will be complete in 2021. Transportation to and commissioning in the APS is planned for 2022-23. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP102 | ||
| About • | paper received ※ 08 July 2019 paper accepted ※ 12 July 2019 issue date ※ 14 August 2019 | ||
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