High field Q slope and the baking effect: Review of recent experimental results and new data on Nb heat treatments

doi:10.1103/PhysRevSTAB.13.022002

Title: High field Q slope and the baking effect: Review of recent experimental results and new data on Nb heat treatments

Journal Article · Mon Feb 01 00:00:00 EST 2010 · Physical Review Special Topics. Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevSTAB.13.022002· OSTI ID:979572

G. Ciovati, G. Myneni, F. Stevie, P. Maheshwari, D. Griffis

The performance of superconducting radio-frequency (SRF) cavities made of bulk Nb at high fields (peak surface magnetic field greater than about 90 mT) is characterized by exponentially increasing rf losses (high-field Q slope), in the absence of field emission, which are often mitigated by low-temperature (100–140°C, 12–48 h) baking. In this contribution, recent experimental results and phenomenological models to explain this effect will be briefly reviewed. New experimental results on the high-field Q slope will be presented for cavities that had been heat treated in a vacuum furnace at high temperature without subsequent chemical etching. These studies are aimed at understanding the role of hydrogen on the high-field Q slope and at the passivation of the Nb surface during heat treatment. Improvement of the cavity performances, particularly of the cavities’ quality factor, have been obtained following the high-temperature heat treatments, while secondary ion mass spectroscopy surface analysis measurements on Nb samples treated with the cavities revealed significantly lower hydrogen concentration than for samples that followed standard cavity treatments.

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

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-06OR23177

OSTI ID:: 979572

Report Number(s):: JLAB-ACC-10-1142; DOE/OR/23177-1209; TRN: US201010%%774

Journal Information:: Physical Review Special Topics. Accelerators and Beams, Vol. 13; ISSN 1098-4402

Country of Publication:: United States

Language:: English

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Influence of material parameters on the performance of niobium-based superconducting radiofrequency cavities Jana, Arup Ratan; Kumar, Abhay; Kumar, Vinit Pramana, Vol. 93, Issue 3 https://doi.org/10.1007/s12043-019-1813-4	journal	July 2019
Modeling the nanoscale linear response of superconducting thin films measured by a scanning probe microwave microscope Tai, Tamin; Ghamsari, B. G.; Anlage, Steven M. Journal of Applied Physics, Vol. 115, Issue 20 https://doi.org/10.1063/1.4878937	journal	May 2014
Near-field microwave magnetic nanoscopy of superconducting radio frequency cavity materials Tai, Tamin; Ghamsari, Behnood G.; Bieler, Thomas R. Applied Physics Letters, Vol. 104, Issue 23 https://doi.org/10.1063/1.4881880	journal	June 2014
Efficient expulsion of magnetic flux in superconducting radiofrequency cavities for high Q ₀ applications Posen, S.; Checchin, M.; Crawford, A. C. Journal of Applied Physics, Vol. 119, Issue 21 https://doi.org/10.1063/1.4953087	journal	June 2016
Electrostatic tuning of mechanical and microwave resonances in 3D superconducting radio frequency cavities Pate, Jacob M.; Martinez, Luis A.; Thompson, Johnathon J. AIP Advances, Vol. 8, Issue 11 https://doi.org/10.1063/1.5055887	journal	November 2018
Flux pinning characteristics in cylindrical niobium samples used for superconducting radio frequency cavity fabrication Dhavale, Asavari S.; Dhakal, Pashupati; Polyanskii, Anatolii A. Superconductor Science and Technology, Vol. 25, Issue 6 https://doi.org/10.1088/0953-2048/25/6/065014	journal	April 2012
Theory of RF superconductivity for resonant cavities Gurevich, Alex Superconductor Science and Technology, Vol. 30, Issue 3 https://doi.org/10.1088/1361-6668/30/3/034004	journal	January 2017
Surface processing for bulk niobium superconducting radio frequency cavities Kelly, M. P.; Reid, T. Superconductor Science and Technology, Vol. 30, Issue 4 https://doi.org/10.1088/1361-6668/aa569a	journal	February 2017
Unprecedented quality factors at accelerating gradients up to 45 MVm ⁻¹ in niobium superconducting resonators via low temperature nitrogen infusion Grassellino, A.; Romanenko, A.; Trenikhina, Y. Superconductor Science and Technology, Vol. 30, Issue 9 https://doi.org/10.1088/1361-6668/aa7afe	journal	August 2017
Effect of low temperature baking in nitrogen on the performance of a niobium superconducting radio frequency cavity Dhakal, Pashupati; Chetri, Santosh; Balachandran, Shreyas Physical Review Accelerators and Beams, Vol. 21, Issue 3 https://doi.org/10.1103/physrevaccelbeams.21.032001	journal	March 2018
Nanoscale nonlinear radio frequency properties of bulk Nb: Origins of extrinsic nonlinear effects Tai, Tamin; Ghamsari, B. G.; Bieler, T. Physical Review B, Vol. 92, Issue 13 https://doi.org/10.1103/physrevb.92.134513	journal	October 2015
Vacancy-Hydrogen Interaction in Niobium during Low-Temperature Baking Wenskat, Marc; Cizek, Jakub; Liedke, Maciej Oskar Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2020-02437	text	January 2020
Vacancy-Hydrogen Interaction in Niobium during Low-Temperature Baking Wenskat, Marc; Čižek, Jakub; Liedke, Maciej Oskar Scientific Reports, Vol. 10, Issue 1 https://doi.org/10.1038/s41598-020-65083-0	journal	May 2020
Near-Field Microwave Magnetic Nanoscopy of Superconducting Radio Frequency Cavity Materials Tai, Tamin; Ghamsari, Behnood G.; Bieler, Thomas R. arXiv https://doi.org/10.48550/arxiv.1312.6257	text	January 2013
Modeling the nanoscale linear response of superconducting thin films measured by a scanning probe microwave microscope Tai, Tamin; Ghamsari, B. G.; Anlage, Steven M. arXiv https://doi.org/10.48550/arxiv.1402.1927	text	January 2014
Nanoscale Nonlinear Radio Frequency Properties of Bulk Nb : Origins of Extrinsic Nonlinear Effects Tai, Tamin; Ghamsari, B. G.; Bieler, T. arXiv https://doi.org/10.48550/arxiv.1507.02777	text	January 2015

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Title: High field Q slope and the baking effect: Review of recent experimental results and new data on Nb heat treatments

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References (26)

Cited By (16)

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