Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through T c

Huang, Shichun; Kubo, Takayuki; Geng, R. L.

doi:10.1103/PhysRevAccelBeams.19.082001

Title: Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through $T_{c}$

Abstract

Recent studies by Romanenko et al. revealed that cooling down a superconducting cavity under a large spatial temperature gradient decreases the amount of trapped flux and leads to reduction of the residual surface resistance. In the present paper, the flux expulsion ratio and the trapped-flux-induced surface resistance of a large-grain cavity cooled down under a spatial temperature gradient up to 80K/m are studied under various applied magnetic fields from 5E-6 T to 2E-5 T. We show the flux expulsion ratio improves as the spatial temperature gradient increases, independent of the applied magnetic field: our results supports and enforces the previous studies. We then analyze all RF measurement results obtained under different applied magnetic fields together by plotting the trapped- flux-induced surface resistance normalized by the applied magnetic field as a function of the spatial temperature gradient. All the data can be fitted by a single curve, which defines an empirical formula for the trapped- flux-induced surface resistance as a function of the spatial temperature gradient and applied magnetic field. The formula can fit not only the present results but also those obtained by Romanenko et al. previously. Furthermore, the sensitivity r_fl of surface resistance from trapped magnetic flux of fine-grainmore »« less

Authors:: Huang, Shichun; Kubo, Takayuki; Geng, R. L.

Publication Date:: Fri Aug 26 00:00:00 EDT 2016

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1307796

Alternate Identifier(s):: OSTI ID: 1334271

Report Number(s):: JLAB-ACC-16-2349; DOE/OR/23177-3930
Journal ID: ISSN 2469-9888; PRABFM; 082001

Grant/Contract Number:: AC05-06OR23177; 26800157; 26600142

Resource Type:: Published Article

Journal Name:: Physical Review Accelerators and Beams

Additional Journal Information:: Journal Name: Physical Review Accelerators and Beams Journal Volume: 19 Journal Issue: 8; Journal ID: ISSN 2469-9888

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS

Citation Formats


                    Huang, Shichun, Kubo, Takayuki, and Geng, R. L. Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through T c.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevAccelBeams.19.082001.

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                    Huang, Shichun, Kubo, Takayuki, & Geng, R. L. Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through T c.  United States.  https://doi.org/10.1103/PhysRevAccelBeams.19.082001

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                    Huang, Shichun, Kubo, Takayuki, and Geng, R. L. Fri .  
"Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through T c".  United States.  https://doi.org/10.1103/PhysRevAccelBeams.19.082001.

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@article{osti_1307796,

  title        = {Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through T c},

  author       = {Huang, Shichun and Kubo, Takayuki and Geng, R. L.},

  abstractNote = {Recent studies by Romanenko et al. revealed that cooling down a superconducting cavity under a large spatial temperature gradient decreases the amount of trapped flux and leads to reduction of the residual surface resistance. In the present paper, the flux expulsion ratio and the trapped-flux-induced surface resistance of a large-grain cavity cooled down under a spatial temperature gradient up to 80K/m are studied under various applied magnetic fields from 5E-6 T to 2E-5 T. We show the flux expulsion ratio improves as the spatial temperature gradient increases, independent of the applied magnetic field: our results supports and enforces the previous studies. We then analyze all RF measurement results obtained under different applied magnetic fields together by plotting the trapped- flux-induced surface resistance normalized by the applied magnetic field as a function of the spatial temperature gradient. All the data can be fitted by a single curve, which defines an empirical formula for the trapped- flux-induced surface resistance as a function of the spatial temperature gradient and applied magnetic field. The formula can fit not only the present results but also those obtained by Romanenko et al. previously. Furthermore, the sensitivity rfl of surface resistance from trapped magnetic flux of fine-grain and large-grain niobium cavities and the origin of dT/ds dependence of Rfl/Ba are also discussed.},

  doi          = {10.1103/PhysRevAccelBeams.19.082001},

  journal      = {Physical Review Accelerators and Beams},

  number       = 8,

  volume       = 19,

  place        = {United States},

  year         = {Fri Aug 26 00:00:00 EDT 2016},

  month        = {Fri Aug 26 00:00:00 EDT 2016}

}

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Works referenced in this record:

Enhancement of rf breakdown field of superconductors by multilayer coating
journal, January 2006

Gurevich, A.
Applied Physics Letters, Vol. 88, Issue 1
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America’s Overview of Superconducting Science and Technology of Ingot Niobium
conference, January 2011

Ciovati, Gianluigi; Kneisel, Peter; Myneni, Ganapati R.
FIRST INTERNATIONAL SYMPOSIUM ON THE SUPERCONDUCTING SCIENCE AND TECHNOLOGY OF INGOT NIOBIUM, AIP Conference Proceedings
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Radio-frequency electromagnetic field and vortex penetration in multilayered superconductors
journal, January 2014

Kubo, Takayuki; Iwashita, Yoshihisa; Saeki, Takayuki
Applied Physics Letters, Vol. 104, Issue 3
DOI: 10.1063/1.4862892

Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around T _c
journal, May 2014

Romanenko, A.; Grassellino, A.; Melnychuk, O.
Journal of Applied Physics, Vol. 115, Issue 18
DOI: 10.1063/1.4875655

Ultra-high quality factors in superconducting niobium cavities in ambient magnetic fields up to 190 mG
journal, December 2014

Romanenko, A.; Grassellino, A.; Crawford, A. C.
Applied Physics Letters, Vol. 105, Issue 23
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Maximum screening fields of superconducting multilayer structures
journal, January 2015

Gurevich, Alex
AIP Advances, Vol. 5, Issue 1
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Proof-of-principle demonstration of Nb ₃ Sn superconducting radiofrequency cavities for high Q ₀ applications
journal, February 2015

Posen, S.; Liepe, M.; Hall, D. L.
Applied Physics Letters, Vol. 106, Issue 8
DOI: 10.1063/1.4913247

Magnetic flux studies in horizontally cooled elliptical superconducting cavities
journal, July 2015

Martinello, M.; Checchin, M.; Grassellino, A.
Journal of Applied Physics, Vol. 118, Issue 4
DOI: 10.1063/1.4927519

Impact of nitrogen doping of niobium superconducting cavities on the sensitivity of surface resistance to trapped magnetic flux
journal, February 2016

Gonnella, Dan; Kaufman, John; Liepe, Matthias
Journal of Applied Physics, Vol. 119, Issue 7
DOI: 10.1063/1.4941944

Nitrogen and argon doping of niobium for superconducting radio frequency cavities: a pathway to highly efficient accelerating structures
journal, August 2013

Grassellino, A.; Romanenko, A.; Sergatskov, D.
Superconductor Science and Technology, Vol. 26, Issue 10
DOI: 10.1088/0953-2048/26/10/102001

Field limit and nano-scale surface topography of superconducting radio-frequency cavity made of extreme type II superconductor
journal, June 2015

Kubo, T.
Progress of Theoretical and Experimental Physics, Vol. 2015, Issue 6
DOI: 10.1093/ptep/ptv082

Magnetic field enhancement at a pit on the surface of a superconducting accelerating cavity
journal, July 2015

Kubo, Takayuki
Progress of Theoretical and Experimental Physics, Vol. 2015, Issue 7
DOI: 10.1093/ptep/ptv088

Flux trapping in superconducting accelerating cavities during cooling down with a spatial temperature gradient
journal, May 2016

Kubo, Takayuki
Progress of Theoretical and Experimental Physics, Vol. 2016, Issue 5
DOI: 10.1093/ptep/ptw049

Works referencing / citing this record:

Analysis of the cool down related cavity performance of the European X-Ray Free Electron Laser vertical acceptance tests
journal, November 2017

Wenskat, M.; Schaffran, J.
AIP Advances, Vol. 7, Issue 11
DOI: 10.1063/1.5004482

Frequency dependence of trapped flux sensitivity in SRF cavities
journal, February 2018

Checchin, M.; Martinello, M.; Grassellino, A.
Applied Physics Letters, Vol. 112, Issue 7
DOI: 10.1063/1.5016525

Theory of RF superconductivity for resonant cavities
journal, January 2017

Gurevich, Alex
Superconductor Science and Technology, Vol. 30, Issue 3
DOI: 10.1088/1361-6668/30/3/034004

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Title: Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through T c

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Title: Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through $T_{c}$

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