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:
-
- CLASSE, Cornell University, Ithaca, New York 14853 (United States)
- 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}
}
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Works referencing / citing this record:
Cryogenic system design for HIAF iLinac
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