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Methods of controllable interstitial oxygen doping in niobium

Patent ·
OSTI ID:2541919
; ;
A method for vacuum heat treating Nb, such as is used in superconducting radio frequency cavities, to engineer the interstitial oxygen profile with depth into the surface to conveniently optimize the low-temperature rf surface resistance of the material. An example application is heating of 1.3 GHz accelerating structures between 250-400° C. to achieve a very high quality factor of 5×1010 at 2.0 K. With data supplied by secondary ion mass spectrometry measurements, application of oxide decomposition and oxygen diffusion theory was applied to quantify previously unknown parameters crucial in achieving the oxygen alloy concentration profiles required to optimize the rf surface resistance. RF measurements of vacuum heat treated Nb superconducting radio frequency cavities confirmed the minimized surface resistance (higher Q0) previously expected only from 800° C. diffusive alloying with nitrogen.
Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-06OR23177
Assignee:
Jefferson Science Associates, LLC (Newport News, VA)
Patent Number(s):
11,920,253
Application Number:
17/735,172
OSTI ID:
2541919
Country of Publication:
United States
Language:
English

References (5)

X-ray investigation of subsurface interstitial oxygen at Nb/oxide interfaces journal March 2008
Niobium near-surface composition during nitrogen infusion relevant for superconducting radio-frequency cavities journal October 2019
Influence of furnace baking on Q–E behavior of superconducting accelerating cavities journal April 2021
Improved oxygen diffusion model to explain the effect of low-temperature baking on high field losses in niobium superconducting cavities journal July 2006
Ultralow Surface Resistance via Vacuum Heat Treatment of Superconducting Radio-Frequency Cavities journal January 2020

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