Medium-velocity superconducting cavity for high accelerating gradient continuous-wave hadron linear accelerators Article Swipe

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K. McGee , S. Kim , Kyle Elliott , Andrei Ganshyn , W. Hartung , Ethan Metzgar , P. N. Ostroumov , Laura Popielarski , John Popielarski , Ambrose C. Taylor , Ting Xu , M. Kelly , B. Guilfoyle , Thomas Reid ·

YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.1103/physrevaccelbeams.24.112003

We present the first rf studies of the medium-beta superconducting radio frequency (SRF) elliptical cavities designed for Michigan State University's Facility for Rare Isotope Beams (FRIB) energy upgrade linac. The proposed energy upgrade for this continuous-wave (CW) superconducting linac will double the final beam energy from 200 to 400 MeV/u for the heaviest uranium ions within the 80 m of space available in the FRIB tunnel. Two prototype β_opt = 0.65 644 MHz five-cell elliptical SRF cavities were fabricated and tested to validate the novel cavity design with three conventional rf recipes: (1) Electropolishing (EP-only), (2) EP + 48 h 120 degrees C bake (EP + baking), and (3) Buffered chemical Polishing + 48 h 120 degrees C bake (BCP + baking). The EP-only recipe achieved a 2 K quality factor (Q₀) of 2.3 x 10¹⁰ at the FRIB energy upgrade design accelerating gradient (E_acc) of 17.5 MV/m, and Q₀ of 1.2 x 10¹⁰ at a maximum gradient of 26 MV/m, where the gradient was ultimately limited by the available rf amplifier power available for this test. These results validate the potential of the novel 644 MHz medium-beta cavity design and motivate its use in future high-Q₀ development work. The multipacting band, which exists at Eacc approximate to 10 MV/m, was completely conditioned in the continuous-wave mode. We also observed that combining the 48 h 120 degrees C baking treatment with EP did not improve the EP-only cavity performance at 2 K due to increased residual resistance (R0) and increased medium-field Q-slope. BCP + baking was also found to produce lower Q₀ in this cavity due to increased medium-field Q-slope. The mechanical modes of this cavity were measured at room temperature, verifying that the quality factor of the dominant "accordion" mechanical mode these medium-beta cavities are particularly vulnerable to is close to that of the 1.3 GHz TESLA cavities. Thus, this mode arising from the novel geometry of these cavities is shown to not be of excessive concern for resonance control.

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Physics

Superconductivity

Condensed Matter Physics

Quantum Mechanics

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Physics Energy (signal processing) Superconductivity Atomic physics Condensed matter physics Quantum mechanics

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Type: article
Language: en
Landing Page: https://doi.org/10.1103/physrevaccelbeams.24.112003
PDF: http://link.aps.org/pdf/10.1103/PhysRevAccelBeams.24.112003
OA Status: diamond
Cited By: 7
References: 25
Related Works: 10
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DOI: https://doi.org/10.1103/physrevaccelbeams.24.112003

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Title: Medium-velocity superconducting cavity for high accelerating gradient continuous-wave hadron linear accelerators

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Type: article

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Language: en

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Publication year: 2021

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Publication date: 2021-11-18

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Authors: K. McGee, S. Kim, Kyle Elliott, Andrei Ganshyn, W. Hartung, Ethan Metzgar, P. N. Ostroumov, Laura Popielarski, John Popielarski, Ambrose C. Taylor, Ting Xu, M. Kelly, B. Guilfoyle, Thomas Reid

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Landing page: https://doi.org/10.1103/physrevaccelbeams.24.112003

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PDF URL: https://link.aps.org/pdf/10.1103/PhysRevAccelBeams.24.112003

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Concepts: Physics, Energy (signal processing), Superconductivity, Atomic physics, Condensed matter physics, Quantum mechanics

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Cited by: 7

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