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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]; ; ;  [2]
  1. CLASSE, Cornell University, Ithaca, New York 14853 (United States)
  2. FNAL, Batavia, Illinois 60510 (United States)
Publication Date:
OSTI Identifier:
22412823
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 2; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CAVITY RESONATORS; DOPED MATERIALS; FERMILAB; GHZ RANGE; LIGHT SOURCES; LINEAR ACCELERATORS; MAGNETIC FIELDS; NIOBIUM; NITROGEN; PERFORMANCE; PERFORMANCE TESTING; QUALITY FACTOR; SUPERCONDUCTING MAGNETS; TEMPERATURE GRADIENTS

Citation Formats

Gonnella, D., E-mail: dg433@cornell.edu, Eichhorn, R., Furuta, F., Ge, M., Hall, D., Ho, V., Hoffstaetter, G., Liepe, M., E-mail: mul2@cornell.edu, O'Connell, T., Posen, S., Quigley, P., Sears, J., Veshcherevich, V., Grassellino, A., Romanenko, A., and Sergatskov, D. A. Nitrogen-doped 9-cell cavity performance in a test cryomodule for LCLS-II. United States: N. p., 2015. Web. doi:10.1063/1.4905681.
Gonnella, D., E-mail: dg433@cornell.edu, Eichhorn, R., Furuta, F., Ge, M., Hall, D., Ho, V., Hoffstaetter, G., Liepe, M., E-mail: mul2@cornell.edu, O'Connell, T., Posen, S., Quigley, P., Sears, J., Veshcherevich, V., Grassellino, A., Romanenko, A., & Sergatskov, D. A. Nitrogen-doped 9-cell cavity performance in a test cryomodule for LCLS-II. United States. https://doi.org/10.1063/1.4905681
Gonnella, D., E-mail: dg433@cornell.edu, Eichhorn, R., Furuta, F., Ge, M., Hall, D., Ho, V., Hoffstaetter, G., Liepe, M., E-mail: mul2@cornell.edu, O'Connell, T., Posen, S., Quigley, P., Sears, J., Veshcherevich, V., Grassellino, A., Romanenko, A., and Sergatskov, D. A. 2015. "Nitrogen-doped 9-cell cavity performance in a test cryomodule for LCLS-II". United States. https://doi.org/10.1063/1.4905681.
@article{osti_22412823,
title = {Nitrogen-doped 9-cell cavity performance in a test cryomodule for LCLS-II},
author = {Gonnella, D., E-mail: dg433@cornell.edu and Eichhorn, R. and Furuta, F. and Ge, M. and Hall, D. and Ho, V. and Hoffstaetter, G. and Liepe, M., E-mail: mul2@cornell.edu and O'Connell, T. and Posen, S. and Quigley, P. and Sears, J. and Veshcherevich, V. and Grassellino, A. and Romanenko, A. and Sergatskov, D. A.},
abstractNote = {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.},
doi = {10.1063/1.4905681},
url = {https://www.osti.gov/biblio/22412823}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 2,
volume = 117,
place = {United States},
year = {Wed Jan 14 00:00:00 EST 2015},
month = {Wed Jan 14 00:00:00 EST 2015}
}

Works referenced in this record:

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journal, May 1974


Dependence of the microwave surface resistance of superconducting niobium on the magnitude of the rf field
journal, June 2013


Decrease of the surface resistance in superconducting niobium resonator cavities by the microwave field
journal, March 2014


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


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


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


Impact of cool-down conditions at T c on the superconducting rf cavity quality factor
journal, October 2013


Works referencing / citing this record:

Cryogenic system design for HIAF iLinac
journal, November 2019


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


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


Efficient expulsion of magnetic flux in superconducting radiofrequency cavities for high Q 0 applications
journal, June 2016


Effect of interstitial impurities on the field dependent microwave surface resistance of niobium
journal, August 2016


The importance of the electron mean free path for superconducting radio-frequency cavities
journal, January 2017


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


Theory of RF superconductivity for resonant cavities
journal, January 2017


Unprecedented quality factors at accelerating gradients up to 45 MVm −1 in niobium superconducting resonators via low temperature nitrogen infusion
journal, August 2017


High- Q operation of superconducting rf cavities: Potential impact of thermocurrents on the rf surface resistance
journal, April 2015