| Paper |
Title |
Page |
| TUPTB042 |
Latest Development of Electropolishing Optimization for 650 MHz Cavity |
512 |
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- V. Chouhan, D.J. Bice, D.A. Burk, S.K. Chandrasekaran, A.T. Cravatta, P.F. Dubiel, G.V. Eremeev, F. Furuta, O.S. Melnychuk, A.V. Netepenko, M.K. Ng, J.P. Ozelis, H. Park, T.J. Ring, G. Wu
Fermilab, Batavia, Illinois, USA
- B.M. Guilfoyle, M.P. Kelly, T. Reid
ANL, Lemont, Illinois, USA
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Electropolishing (EP) of 1.3 GHz niobium (Nb) superconducting RF cavities is conducted to achieve a desired smooth and contaminant-free surface that yields good RF performance. Achieving a smooth surface of a large-sized elliptical cavity with the standard EP conditions was found to be challenging. This work aimed to conduct a systematic parametric EP study to understand the effects of various EP parameters on the surface of 650 MHz cavities used in PIP-II linac. Parameters optimized in this study provided a smooth surface of the cavities. The electropolished cavities met the baseline requirement of field gradient and qualified for further surface treatment to improve the cavity quality factor.
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-SRF2023-TUPTB042
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| About • |
Received ※ 19 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 28 June 2023 — Issue date ※ 06 July 2023 |
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| WEIXA05 |
Electropolishing Study on Nitrogen-Doped Niobium Surface |
641 |
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- V. Chouhan, T.J. Ring, G. Wu
Fermilab, Batavia, Illinois, USA
- E.A.S. Viklund
NU, Evanston, Illinois, USA
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The nitrogen doping (N-doping) process is applied to niobium (Nb) superconducting cavities to enhance their quality factors. The N-doping is followed by an electropolishing process that provides the final surface of the cavities. A controlled EP process is necessary to get the benefit of N-doping and achieve a high accelerating gradient. We have performed electropolishing of N-doped Nb surface under various conditions to understand their impact on the surface. A modified EP process was developed to obtain a smooth pit-free surface.
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Slides WEIXA05 [17.622 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-SRF2023-WEIXA05
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| About • |
Received ※ 19 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 29 June 2023 — Issue date ※ 03 July 2023 |
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| WEPWB076 |
Low Particulates Nitrogen Purge and Backfill during Prototype HB650 Cryomodule String Assembly |
765 |
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- T.J. Ring, M.B. Quinlan, G. Wu
Fermilab, Batavia, Illinois, USA
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Funding: This manuscript has been authored by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
A low particulate vacuum and purging system was developed to support PIP-II cryomodule string assembly. The overpressure can be controlled at a precision of 1 mbar above the atmospheric pressure regardless of the cavity or string assembly air volume. The system minimized the risk of uncontrolled nitrogen flow during the string assembly. Design features will be presented.
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-SRF2023-WEPWB076
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| About • |
Received ※ 19 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 09 July 2023 |
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reference for this paper using
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※ LaTeX,
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