Didi Luo
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View article: The magnetic field impact on the thermal conductivity of superconducting niobium
The magnetic field impact on the thermal conductivity of superconducting niobium Open
Particle accelerators extensively use superconducting radio frequency (SRF) cavities as essential components. The performance of the SRF cavities hinges critically on the thermal conductivity of the superconducting materials they are compo…
View article: A Surface Composition Study of Niobium after BCP for SRF Cavity in Particle Accelerator
A Surface Composition Study of Niobium after BCP for SRF Cavity in Particle Accelerator Open
Nitrogen contamination from post-processing significantly affects the performance of niobium superconducting radiofrequency (SRF) cavities. Therefore, several performance-boosting strategies, including nitrogen doping, infusion and chemica…
View article: The Magnetic Field Impact on the Thermal Conductivity of Superconducting Niobium
The Magnetic Field Impact on the Thermal Conductivity of Superconducting Niobium Open
View article: A Novel Application of High Thermal Conductivity Material on Superconducting RF Cavities: The Inner-wall Thermal Conducting Film (ITCF)
A Novel Application of High Thermal Conductivity Material on Superconducting RF Cavities: The Inner-wall Thermal Conducting Film (ITCF) Open
Superconducting Radiofrequency (SRF) technology has developed rapidly for the requirements of high-energy accelerators in fundamental physics research and nuclear industry applications. Thus, the SRF community endeavored to improve the per…
View article: Insight into reactive oxygen plasma characteristics and reaction mechanism on SRF accelerator plasma cleaning
Insight into reactive oxygen plasma characteristics and reaction mechanism on SRF accelerator plasma cleaning Open
Reactive oxygen plasma treatment is an effective technique to eliminate hydrocarbon and improve the performance of superconducting radio frequency (SRF) cavities. This work investigated the reaction mechanism between reactive oxygen plasma…
View article: Low-Temperature and High-Sensitivity Au-Decorated Sno2 Sensor for Ethanol Detection
Low-Temperature and High-Sensitivity Au-Decorated Sno2 Sensor for Ethanol Detection Open
View article: Discovery Of Copper Catalyst For New Chemical Polishing Acid On Superconducting Niobium
Discovery Of Copper Catalyst For New Chemical Polishing Acid On Superconducting Niobium Open
High field Q-slope (HFQS) seriously limits the high gradient performance of the buffered chemically polished (BCP) superconducting radio frequency (SRF) niobium cavities. The direct cause or mechanism is not yet fully understood. In our re…
View article: Nitrogen Contamination Causes High Field Q-Slope (HFQS) in Buffered Chemical Polished SRF Cavities
Nitrogen Contamination Causes High Field Q-Slope (HFQS) in Buffered Chemical Polished SRF Cavities Open
Buffered Chemical Polishing (BCP) was the most conventional polishing method for superconducting radio frequency (SRF) Niobium (Nb) cavity surface preparation before the discovery of Electropolishing (EP), which is superior to BCP in high …
View article: FRIB Solenoid Package in Cryomodule and Local Magnetic Shield
FRIB Solenoid Package in Cryomodule and Local Magnetic Shield Open
FRIB cryomodule design has a feature: solenoid package(s) and local magnetic shields in the cryomodule. In this design, exposing SRF cavities to a very strong fringe field from the solenoid is concerned. A tangled issue between solenoid pa…
View article: Analysis of High Field Q-Slope (HFQS) Causes and Development of New Chemical Polishing Acid
Analysis of High Field Q-Slope (HFQS) Causes and Development of New Chemical Polishing Acid Open
In our previous studies of High Field Q-slope (HFQS) we have concluded that nitrogen contamination from the nitric acid is the main cause of the degradation of the Q in buffered chemical polished cavities. Our conclusion is made based on p…
View article: Performance Testing of FRIB Early Series Cryomodules
Performance Testing of FRIB Early Series Cryomodules Open
Construction of a new accelerator for nuclear physics research, the Facility for Rare Isotope Beams (FRIB), is underway at Michigan State University (MSU). The FRIB linac will use superconducting resonators at an operating temperature of 2…
View article: Polarity Check of the FRIB Cryomodule Solenoids by Measuring Leakage Magnetic Field
Polarity Check of the FRIB Cryomodule Solenoids by Measuring Leakage Magnetic Field Open
We observed the outside magnetic field of the first β=0.085 production cryomodule while a solenoid and steering dipoles are under operation. This measurement aims to check the polarity on these magnets after the final installation in the a…
View article: A novel compact cathode using sponge-like RANEY® nickel as the sulfur immobilizer for lithium–sulfur batteries
A novel compact cathode using sponge-like RANEY® nickel as the sulfur immobilizer for lithium–sulfur batteries Open
A novel sulfur immobilizer named RANEY® nickel is introduced for lithium–sulfur batteries for the first time.
View article: Solenoid/Magnetic Shielding Test Results in FRIB-1&2 Cryomodules
Solenoid/Magnetic Shielding Test Results in FRIB-1&2 Cryomodules Open
Recently we did bunker tests for FRIB first cryomodule (CM-1) and second one (CM-2) which houses 0.085 QWRs and solenoid packages. Their performances were successfully validated in the full configuration. This paper reports the solenoid pa…