Investigations Towards Ultra-Low Cost Nb3Sn SRF Fabrication via Melt Casted Bronze Route Processing

Rey, Chris; Eremeev, Grigory V.; Valente-Feliciano, Anne-Marie

doi:10.1109/tasc.2021.3066130

Title: Investigations Towards Ultra-Low Cost Nb₃Sn SRF Fabrication via Melt Casted Bronze Route Processing

Abstract

Here, a novel approach to fabricating Nb₃Sn SRF cavities and other RF components using an ultra-low-cost melt casting fabrication process has been investigated. This simple, low cost melt casting technique has the potential to be used to fabricate nearly any superconducting Nb3Sn structure using either the Bronze Route (BR), Internal Tin (IT), External Tin (ET) processes as well as normal conducting pure copper (Cu) cavities. Most of the heat treated samples that were examined using SEM/EDX seemed to show a reasonable correlation of T_c onset and transition width (ΔT_c) of the ingots initial/starting Sn content to the desired stoichiometric Nb₃Sn phase, where the lower starting Sn content coupons resulted in lower T_c's with broader transition widths and the higher starting Sn coupons resulted in higher T_c's with narrower ΔT_c’s. The best samples had T_c onsets ~17-18 K and ΔT_c's < 2 K. Two samples were further tested for RF surface resistance (R_s) and Quality Factor (Q) at JLAB. Here, these RF measurements were performed at 7.4 GHz using a calorimetric technique and showed two transitions, one at ~ 8 K and another at ~ 14 K; values of R_s were at least two orders of magnitude higher than similar highmore »« less

Authors:

Rey, Chris ^[1]; Eremeev, Grigory V. ^[2]; Valente-Feliciano, Anne-Marie ^[3]

Energy to Power Solutions (e2P), Knoxville, TN (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Publication Date:: Wed Mar 17 00:00:00 EDT 2021

Research Org.:: Energy to Power Solutions (e2P), Knoxville, TN (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:: 1774761

Alternate Identifier(s):: OSTI ID: 1797406; OSTI ID: 1831480

Report Number(s):: JLAB-ACC-21-3360; DOE/OR/23177-5177; FERMILAB-PUB-21-583-TD
Journal ID: ISSN 1051-8223; TRN: US2209256

Grant/Contract Number:: SC0018713; SC00018713; AC05-06OR23177; AC02-07CH11359

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Applied Superconductivity

Additional Journal Information:: Journal Volume: 31; Journal Issue: 5; Journal ID: ISSN 1051-8223

Publisher:: IEEE

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Bronze route; Nb3Sn; SRF cavity

Citation Formats


                    Rey, Chris, Eremeev, Grigory V., and Valente-Feliciano, Anne-Marie. Investigations Towards Ultra-Low Cost Nb3Sn SRF Fabrication via Melt Casted Bronze Route Processing.  United States: N. p., 2021. 
Web.  doi:10.1109/tasc.2021.3066130.

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                    Rey, Chris, Eremeev, Grigory V., & Valente-Feliciano, Anne-Marie. Investigations Towards Ultra-Low Cost Nb3Sn SRF Fabrication via Melt Casted Bronze Route Processing.  United States.  https://doi.org/10.1109/tasc.2021.3066130

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                    Rey, Chris, Eremeev, Grigory V., and Valente-Feliciano, Anne-Marie. Wed .  
"Investigations Towards Ultra-Low Cost Nb3Sn SRF Fabrication via Melt Casted Bronze Route Processing".  United States.  https://doi.org/10.1109/tasc.2021.3066130.  https://www.osti.gov/servlets/purl/1774761.

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@article{osti_1774761,

  title        = {Investigations Towards Ultra-Low Cost Nb3Sn SRF Fabrication via Melt Casted Bronze Route Processing},

  author       = {Rey, Chris and Eremeev, Grigory V. and Valente-Feliciano, Anne-Marie},

  abstractNote = {Here, a novel approach to fabricating Nb3Sn SRF cavities and other RF components using an ultra-low-cost melt casting fabrication process has been investigated. This simple, low cost melt casting technique has the potential to be used to fabricate nearly any superconducting Nb3Sn structure using either the Bronze Route (BR), Internal Tin (IT), External Tin (ET) processes as well as normal conducting pure copper (Cu) cavities. Most of the heat treated samples that were examined using SEM/EDX seemed to show a reasonable correlation of Tc onset and transition width (ΔTc) of the ingots initial/starting Sn content to the desired stoichiometric Nb3Sn phase, where the lower starting Sn content coupons resulted in lower Tc's with broader transition widths and the higher starting Sn coupons resulted in higher Tc's with narrower ΔTc’s. The best samples had Tc onsets ~17-18 K and ΔTc's < 2 K. Two samples were further tested for RF surface resistance (Rs) and Quality Factor (Q) at JLAB. Here, these RF measurements were performed at 7.4 GHz using a calorimetric technique and showed two transitions, one at ~ 8 K and another at ~ 14 K; values of Rs were at least two orders of magnitude higher than similar high quality Nb3Sn films directly deposited substrates by JLAB and with another superconducting transition close to the superconducting transition temperature of niobium. Substantial improvements in the processing variables ranging from higher quality of the initial ingots with higher Sn content, to better electropolishing and reaction heat treatment regimens will be necessary to realize improved RF performance metrics.},

  doi          = {10.1109/tasc.2021.3066130},

  journal      = {IEEE Transactions on Applied Superconductivity},

  number       = 5,

  volume       = 31,

  place        = {United States},

  year         = {Wed Mar 17 00:00:00 EDT 2021},

  month        = {Wed Mar 17 00:00:00 EDT 2021}

}

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Works referenced in this record:

Growth Rate and Morphology of Nb3Sn Layers in ITER-Type Bronze-Processed Wires Under Different Diffusion Annealing Regimes
journal, June 2018

Valova-Zaharevskaya, Evgeniya; Popova, Elena; Deryagina, Irina
IEEE Transactions on Applied Superconductivity, Vol. 28, Issue 4
DOI: 10.1109/TASC.2018.2801324

Effect of Sn Concentration in Bronze Matrix on the Pre-Reaction Formation of Nb3Sn Layers in Bronze-Processed Superconducting Strands of Different Design
journal, June 2018

Deryagina, Irina; Popova, Elena; Patrakov, Evgeny
IEEE Transactions on Applied Superconductivity, Vol. 28, Issue 4
DOI: 10.1109/TASC.2018.2791532

The Nb3Sn layers formation at diffusion annealing of Ti-doped multifilamentary Nb/Cu–Sn composites
journal, September 2014

Popova, E. N.; Deryagina, I. L.; Valova-Zaharevskaya, E. G.
Cryogenics, Vol. 63
DOI: 10.1016/j.cryogenics.2014.07.007

Changes in flux pinning curve shape for flux-line separations comparable to grain size in Nb[sub 3]Sn wires
conference, January 2002

Cooley, L. D.
AIP Conference Proceedings
DOI: 10.1063/1.1472633

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Similar Records

Title: Investigations Towards Ultra-Low Cost Nb3Sn SRF Fabrication via Melt Casted Bronze Route Processing

Abstract

Citation Formats

Growth Rate and Morphology of Nb3Sn Layers in ITER-Type Bronze-Processed Wires Under Different Diffusion Annealing Regimes journal, June 2018

Effect of Sn Concentration in Bronze Matrix on the Pre-Reaction Formation of Nb3Sn Layers in Bronze-Processed Superconducting Strands of Different Design journal, June 2018

The Nb3Sn layers formation at diffusion annealing of Ti-doped multifilamentary Nb/Cu–Sn composites journal, September 2014

Changes in flux pinning curve shape for flux-line separations comparable to grain size in Nb[sub 3]Sn wires conference, January 2002

Title: Investigations Towards Ultra-Low Cost Nb₃Sn SRF Fabrication via Melt Casted Bronze Route Processing

Growth Rate and Morphology of Nb3Sn Layers in ITER-Type Bronze-Processed Wires Under Different Diffusion Annealing Regimes
journal, June 2018

Effect of Sn Concentration in Bronze Matrix on the Pre-Reaction Formation of Nb3Sn Layers in Bronze-Processed Superconducting Strands of Different Design
journal, June 2018

The Nb3Sn layers formation at diffusion annealing of Ti-doped multifilamentary Nb/Cu–Sn composites
journal, September 2014

Changes in flux pinning curve shape for flux-line separations comparable to grain size in Nb[sub 3]Sn wires
conference, January 2002