Niobium thin film deposition studies on copper surfaces for superconducting radio frequency cavity applications

doi:10.1103/PhysRevSTAB.15.062002

Title: Niobium thin film deposition studies on copper surfaces for superconducting radio frequency cavity applications

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Abstract

Thin film coatings have the potential to increase both the thermal efficiency and accelerating gradient in superconducting radio frequency accelerator cavities. However, before this potential can be realized, systematic studies on structure-property correlations in these thin films need to be carried out since the reduced geometry, combined with specific growth parameters, can modify the physical properties of the materials when compared to their bulk form. Here, we present our systematic studies of Nb thin films deposited onto Cu surfaces to clarify possible reasons for the limited success that this process exhibited in previous attempts. We compare these films with Nb grown on other surfaces. In particular, we study the crystal structure and surface morphology and their effect on superconducting properties, such as critical temperature and lower critical field. We found that higher deposition temperature leads to a sharper critical temperature transition, but also to increased roughness indicating that there are competing mechanisms that must be considered for further optimization.

Authors:: W. M. Roach, D. B. Beringer, J. R. Skuza, W. A. Oliver, C. Clavero, C. E. Reece, R. A. Lukaszew

Publication Date:: Fri Jun 01 00:00:00 EDT 2012

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

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1049491

Report Number(s):: JLAB-ACC-12-1569; DOE/OR/23177-2306
Journal ID: ISSN 1098-4402; Defense Threat Reduction Agency (HDTRA1-10-1-0072); TRN: US1204461

DOE Contract Number:: AC05-06OR23177

Resource Type:: Journal Article

Journal Name:: Physical Review Special Topics - Accelerators and Beams

Additional Journal Information:: Journal Volume: 15; Journal Issue: 06; Journal ID: ISSN 1098-4402

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; ACCELERATORS; CAVITIES; COATINGS; COPPER; CRITICAL FIELD; CRITICAL TEMPERATURE; CRYSTAL STRUCTURE; DEPOSITION; GEOMETRY; MORPHOLOGY; NIOBIUM; OPTIMIZATION; PHYSICAL PROPERTIES; ROUGHNESS; THERMAL EFFICIENCY; THIN FILMS

Citation Formats


                    W. M. Roach, D. B. Beringer, J. R. Skuza, W. A. Oliver, C. Clavero, C. E. Reece, R. A. Lukaszew. Niobium thin film deposition studies on copper surfaces for superconducting radio frequency cavity applications.  United States: N. p., 2012. 
        Web.  doi:10.1103/PhysRevSTAB.15.062002.

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                    W. M. Roach, D. B. Beringer, J. R. Skuza, W. A. Oliver, C. Clavero, C. E. Reece, R. A. Lukaszew. Niobium thin film deposition studies on copper surfaces for superconducting radio frequency cavity applications.  United States.  https://doi.org/10.1103/PhysRevSTAB.15.062002

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                    W. M. Roach, D. B. Beringer, J. R. Skuza, W. A. Oliver, C. Clavero, C. E. Reece, R. A. Lukaszew. 2012.  
        "Niobium thin film deposition studies on copper surfaces for superconducting radio frequency cavity applications".  United States.  https://doi.org/10.1103/PhysRevSTAB.15.062002.

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@article{osti_1049491,

  title        = {Niobium thin film deposition studies on copper surfaces for superconducting radio frequency cavity applications},

  author       = {W. M. Roach, D. B. Beringer, J. R. Skuza, W. A. Oliver, C. Clavero, C. E. Reece, R. A. Lukaszew},

  abstractNote = {Thin film coatings have the potential to increase both the thermal efficiency and accelerating gradient in superconducting radio frequency accelerator cavities. However, before this potential can be realized, systematic studies on structure-property correlations in these thin films need to be carried out since the reduced geometry, combined with specific growth parameters, can modify the physical properties of the materials when compared to their bulk form. Here, we present our systematic studies of Nb thin films deposited onto Cu surfaces to clarify possible reasons for the limited success that this process exhibited in previous attempts. We compare these films with Nb grown on other surfaces. In particular, we study the crystal structure and surface morphology and their effect on superconducting properties, such as critical temperature and lower critical field. We found that higher deposition temperature leads to a sharper critical temperature transition, but also to increased roughness indicating that there are competing mechanisms that must be considered for further optimization.},

  doi          = {10.1103/PhysRevSTAB.15.062002},

  url          = {https://www.osti.gov/biblio/1049491},
  journal      = {Physical Review Special Topics - Accelerators and Beams},

  issn         = {1098-4402},

  number       = 06,

  volume       = 15,

  place        = {United States},

  year         = {Fri Jun 01 00:00:00 EDT 2012},

  month        = {Fri Jun 01 00:00:00 EDT 2012}

}

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