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Title: Unprecedented quality factors at accelerating gradients up to 45 MVm -1 in niobium superconducting resonators via low temperature nitrogen infusion

Here, we report the finding of new surface treatments that permit to manipulate the niobium resonator nitrogen content in the first few nanometers in a controlled way, and the resonator fundamental Mattis-Bardeen surface resistance and residual resistance accordingly. In particular, we find surface infusion conditions that systematically a) increase the quality factor of these 1.3 GHz superconducting radio frequency (SRF) bulk niobium resonators, up to very high gradients; b) increase the achievable accelerating gradient of the cavity compared to its own baseline with state-of-the-art surface processing. Cavities subject to the new surface process have larger than two times the state of the art Q at 2K for accelerating fields > 35 MV/m. Moreover, very high accelerating gradients ~ 45 MV/m are repeatedly reached, which correspond to peak magnetic surface fields of 190 mT, among the highest measured for bulk niobium cavities. These findings open the opportunity to tailor the surface impurity content distribution to maximize performance in Q and gradients, and have therefore very important implications on future performance and cost of SRF based accelerators. They also help deepen the understanding of the physics of the RF niobium cavity surface.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Report Number(s):
arXiv:1701.06077; FERMILAB-PUB-17-458-TD
Journal ID: ISSN 0953-2048; 1510309
Grant/Contract Number:
AC02-07CH11359; Early Career Award "Impurity D; GARD Program
Type:
Published Article
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 30; Journal Issue: 9; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; SRF; nitrogen doping; nitrogen infusion; high Q; high accelerating gradient; radio frequency surface resistance
OSTI Identifier:
1437715
Alternate Identifier(s):
OSTI ID: 1407126

Grassellino, A., Romanenko, A., Trenikhina, Y., Checchin, M., Martinello, M., Melnychuk, O. S., Chandrasekaran, S., Sergatskov, D. A., Posen, S., Crawford, A. C., Aderhold, S., and Bice, D.. Unprecedented quality factors at accelerating gradients up to 45 MVm-1 in niobium superconducting resonators via low temperature nitrogen infusion. United States: N. p., Web. doi:10.1088/1361-6668/aa7afe.
Grassellino, A., Romanenko, A., Trenikhina, Y., Checchin, M., Martinello, M., Melnychuk, O. S., Chandrasekaran, S., Sergatskov, D. A., Posen, S., Crawford, A. C., Aderhold, S., & Bice, D.. Unprecedented quality factors at accelerating gradients up to 45 MVm-1 in niobium superconducting resonators via low temperature nitrogen infusion. United States. doi:10.1088/1361-6668/aa7afe.
Grassellino, A., Romanenko, A., Trenikhina, Y., Checchin, M., Martinello, M., Melnychuk, O. S., Chandrasekaran, S., Sergatskov, D. A., Posen, S., Crawford, A. C., Aderhold, S., and Bice, D.. 2017. "Unprecedented quality factors at accelerating gradients up to 45 MVm-1 in niobium superconducting resonators via low temperature nitrogen infusion". United States. doi:10.1088/1361-6668/aa7afe.
@article{osti_1437715,
title = {Unprecedented quality factors at accelerating gradients up to 45 MVm-1 in niobium superconducting resonators via low temperature nitrogen infusion},
author = {Grassellino, A. and Romanenko, A. and Trenikhina, Y. and Checchin, M. and Martinello, M. and Melnychuk, O. S. and Chandrasekaran, S. and Sergatskov, D. A. and Posen, S. and Crawford, A. C. and Aderhold, S. and Bice, D.},
abstractNote = {Here, we report the finding of new surface treatments that permit to manipulate the niobium resonator nitrogen content in the first few nanometers in a controlled way, and the resonator fundamental Mattis-Bardeen surface resistance and residual resistance accordingly. In particular, we find surface infusion conditions that systematically a) increase the quality factor of these 1.3 GHz superconducting radio frequency (SRF) bulk niobium resonators, up to very high gradients; b) increase the achievable accelerating gradient of the cavity compared to its own baseline with state-of-the-art surface processing. Cavities subject to the new surface process have larger than two times the state of the art Q at 2K for accelerating fields > 35 MV/m. Moreover, very high accelerating gradients ~ 45 MV/m are repeatedly reached, which correspond to peak magnetic surface fields of 190 mT, among the highest measured for bulk niobium cavities. These findings open the opportunity to tailor the surface impurity content distribution to maximize performance in Q and gradients, and have therefore very important implications on future performance and cost of SRF based accelerators. They also help deepen the understanding of the physics of the RF niobium cavity surface.},
doi = {10.1088/1361-6668/aa7afe},
journal = {Superconductor Science and Technology},
number = 9,
volume = 30,
place = {United States},
year = {2017},
month = {8}
}