Effect of cooldown and residual magnetic field on the performance of niobium–copper clad superconducting radio-frequency cavity
Abstract
Here, we present the results of rf measurements on a niobium–copper clad superconducting radio-frequency cavity with different cooldown conditions and residual magnetic field in a vertical test Dewar in order to explore the effect of thermal current induced magnetic field and its trapping on the performance of the cavity. The residual resistance, extracted from the Q 0(T) curves in the temperature range 4.3–1.5 K, showed no dependence on a temperature gradient along the cavity during the cooldown across the critical temperature up to ~50 K m–1. The rf losses due to the trapping of residual magnetic field during the cavity cooldown were found to be ~4.3 nΩ μT–1, comparable to the values measured in bulk niobium cavities. An increase of residual resistance following multiple cavity quenches was observed along with evidence of trapping of magnetic flux generated by thermoelectric currents.
- Authors:
-
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1411186
- Report Number(s):
- JLAB-ACC-17-2474; DOE/OR/23177-4144
Journal ID: ISSN 0953-2048; TRN: US1800194
- Grant/Contract Number:
- AC05-06OR23177
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Superconductor Science and Technology
- Additional Journal Information:
- Journal Volume: 31; Journal Issue: 1; Journal ID: ISSN 0953-2048
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; niobium; superconducting cavities; flux expulsion; NbCu
Citation Formats
Dhakal, Pashupati, and Ciovati, Gianluigi. Effect of cooldown and residual magnetic field on the performance of niobium–copper clad superconducting radio-frequency cavity. United States: N. p., 2017.
Web. doi:10.1088/1361-6668/aa96f5.
Dhakal, Pashupati, & Ciovati, Gianluigi. Effect of cooldown and residual magnetic field on the performance of niobium–copper clad superconducting radio-frequency cavity. United States. https://doi.org/10.1088/1361-6668/aa96f5
Dhakal, Pashupati, and Ciovati, Gianluigi. Wed .
"Effect of cooldown and residual magnetic field on the performance of niobium–copper clad superconducting radio-frequency cavity". United States. https://doi.org/10.1088/1361-6668/aa96f5. https://www.osti.gov/servlets/purl/1411186.
@article{osti_1411186,
title = {Effect of cooldown and residual magnetic field on the performance of niobium–copper clad superconducting radio-frequency cavity},
author = {Dhakal, Pashupati and Ciovati, Gianluigi},
abstractNote = {Here, we present the results of rf measurements on a niobium–copper clad superconducting radio-frequency cavity with different cooldown conditions and residual magnetic field in a vertical test Dewar in order to explore the effect of thermal current induced magnetic field and its trapping on the performance of the cavity. The residual resistance, extracted from the Q 0(T) curves in the temperature range 4.3–1.5 K, showed no dependence on a temperature gradient along the cavity during the cooldown across the critical temperature up to ~50 K m–1. The rf losses due to the trapping of residual magnetic field during the cavity cooldown were found to be ~4.3 nΩ μT–1, comparable to the values measured in bulk niobium cavities. An increase of residual resistance following multiple cavity quenches was observed along with evidence of trapping of magnetic flux generated by thermoelectric currents.},
doi = {10.1088/1361-6668/aa96f5},
journal = {Superconductor Science and Technology},
number = 1,
volume = 31,
place = {United States},
year = {2017},
month = {11}
}
Web of Science