Nitrogen-doped 9-cell cavity performance in a test cryomodule for LCLS-II

Eichhorn, R.; Furuta, F.; Ge, M.; Hall, D.; Ho, V.; Hoffstaetter, G.; O'Connell, T.; Posen, S.; Quigley, P.; Sears, J.; Veshcherevich, V.; Grassellino, A.; Romanenko, A.; Sergatskov, D. A.

doi:10.1063/1.4905681

Title: Nitrogen-doped 9-cell cavity performance in a test cryomodule for LCLS-II

Journal Article · Wed Jan 14 00:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4905681· OSTI ID:22412823

Eichhorn, R.; Furuta, F.; Ge, M.; Hall, D.; Ho, V.; Hoffstaetter, G.; O'Connell, T.; Posen, S.; Quigley, P.; Sears, J.; Veshcherevich, V. ^[1]; Grassellino, A.; Romanenko, A.; Sergatskov, D. A. ^[2]

CLASSE, Cornell University, Ithaca, New York 14853 (United States)
FNAL, Batavia, Illinois 60510 (United States)

The superconducting RF linac for Linac Coherent Light Source-II calls for 1.3 GHz 9-cell cavities with an average intrinsic quality factor Q{sub 0} of 2.7 × 10{sup 10} at 2.0 K and 16 MV/m accelerating gradient. Two niobium 9 cell cavities, prepared with nitrogen-doping at Fermilab, were assembled into the Cornell Horizontal Test Cryomodule (HTC) to test cavity performance in a cryomodule that is very similar to a full LCLS-II cryomodule. The cavities met LCLS-II specifications with an average quench field of 17 MV/m and an average Q{sub 0} of 3 × 10{sup 10}. The sensitivity of the cavities' residual resistance to ambient magnetic field was determined to be 0.5 nΩ/mG during fast cool down. In two cool downs, a heater attached to one of the cavity beam tubes was used to induce large horizontal temperature gradients. Here, we report on the results of these first tests of nitrogen-doped cavities in a cryomodule, which provide critical information for the LCLS-II project.

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OSTI ID:: 22412823

Journal Information:: Journal of Applied Physics, Vol. 117, Issue 2; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979

Country of Publication:: United States

Language:: English

References (13)

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Magnetic flux studies in horizontally cooled elliptical superconducting cavities Martinello, M.; Checchin, M.; Grassellino, A. Journal of Applied Physics, Vol. 118, Issue 4 https://doi.org/10.1063/1.4927519	journal	July 2015
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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
Effect of interstitial impurities on the field dependent microwave surface resistance of niobium Martinello, M.; Grassellino, A.; Checchin, M. Applied Physics Letters, Vol. 109, Issue 6 https://doi.org/10.1063/1.4960801	journal	August 2016
The importance of the electron mean free path for superconducting radio-frequency cavities Maniscalco, J. T.; Gonnella, D.; Liepe, M. Journal of Applied Physics, Vol. 121, Issue 4 https://doi.org/10.1063/1.4974909	journal	January 2017
Frequency dependence of trapped flux sensitivity in SRF cavities Checchin, M.; Martinello, M.; Grassellino, A. Applied Physics Letters, Vol. 112, Issue 7 https://doi.org/10.1063/1.5016525	journal	February 2018
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
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
High- $Q$ operation of superconducting rf cavities: Potential impact of thermocurrents on the rf surface resistance Vogt, J. -M.; Kugeler, O.; Knobloch, J. Physical Review Special Topics - Accelerators and Beams, Vol. 18, Issue 4 https://doi.org/10.1103/physrevstab.18.042001	journal	April 2015
Effect of interstitial impurities on the field dependent microwave surface resistance of niobium Martinello, M.; Grassellino, A.; Checchin, M. arXiv https://doi.org/10.48550/arxiv.1606.04174	text	January 2016

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