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View article: Plasma cleaning of the SLAC Linac Coherent Light Source II high energy verification cryomodule cavities
Plasma cleaning of the SLAC Linac Coherent Light Source II high energy verification cryomodule cavities Open
Plasma cleaning is a technique that can be applied in superconducting radio-frequency (SRF) cavities in situ in cryomodules in order to decrease their level of field emission. We developed the technique for the Linac Coherent Light Source …
View article: Plasma Cleaning of LCLS-II-HE verification cryomodule cavities
Plasma Cleaning of LCLS-II-HE verification cryomodule cavities Open
Plasma cleaning is a technique that can be applied in superconducting radio-frequency (SRF) cavities in situ in cryomodules in order to decrease their level of field emission. We developed the technique for the Linac Coherent Light Source …
View article: Results of plasma processing applied to the LCLS-II-HE vCM cavities [Poster]
Results of plasma processing applied to the LCLS-II-HE vCM cavities [Poster] Open
standard cryomodule components are nearing completion. The first LCLS-II-HE cryomodule, referred to as the verification cryomodule (vCM) was assembled and tested at Fermilab. Fermilab has completed the assembly of the second cryomodule. Th…
View article: Intrinsic spatial chirp of subcycle terahertz pulsed beams
Intrinsic spatial chirp of subcycle terahertz pulsed beams Open
Here, we present an analysis of spatial chirp in subcycle pulsed beams corroborated by spatiotemporal electro-optic sampling measurements of terahertz radiation. Modeling the subcycle pulsed beam as a superposition of monochromatic Gaussia…
View article: Final Design Report Proton Power Upgrade Project
Final Design Report Proton Power Upgrade Project Open
Oak Ridge National Laboratory (ORNL) operates and develops world-leading neutron scattering user facilities as centers of scientific excellence, attracting the best researchers from universities, industry, and national laboratories to adva…
View article: Plasma ignition and detection for <i>in-situ</i> cleaning of 1.3 GHz 9-cell cavities
Plasma ignition and detection for <i>in-situ</i> cleaning of 1.3 GHz 9-cell cavities Open
Superconducting radio frequency cavities performance preservation is crucial, from vertical test to accelerator operation. Field emission is still one of the performance limiting factors to overcome, and plasma cleaning has been proven suc…
View article: Low RF Power Plasma Ignition and Detection for In-Situ Cleaning of 1.3 GHz 9-Cell Cavities
Low RF Power Plasma Ignition and Detection for In-Situ Cleaning of 1.3 GHz 9-Cell Cavities Open
Superconducting Radio Frequency (SRF) cavities performance preservation is crucial, from vertical test to accelerator operation. Field Emission (FE) is still one of the performance limiting factors to overcome and plasma cleaning has been …
View article: Plasma Processing to Reduce Field Emission in LCLS-II 1.3 GHz SRF Cavities
Plasma Processing to Reduce Field Emission in LCLS-II 1.3 GHz SRF Cavities Open
Plasma cleaning for LCLS-II 9-cell 1.3 GHz cavities is under study at Fermilab. Starting from ORNL method, we have developed a new technique for plasma ignition using HOMs. Plasma processing is being applied to contaminated and field emitt…
View article: Improving the Work Function of Nitrogen-Doped Niobium Surfaces for SRF Cavities by Plasma Processing
Improving the Work Function of Nitrogen-Doped Niobium Surfaces for SRF Cavities by Plasma Processing Open
Work function and surface chemistries of SiC-polished, electropolished, and nitrogen-doped niobium coupons were analyzed before and after plasma processing using a neon-oxygen gas mixture. These studies represent an initial enquiry into th…
View article: Proton Power Upgrade: Conceptual Design Report
Proton Power Upgrade: Conceptual Design Report Open
Oak Ridge National Laboratory (ORNL) operates and develops world-leading neutron scattering user facilities as centers of scientific excellence, attracting the best researchers from universities, industry, and national laboratories to adva…
View article: Evolution of the Superconducting Linac Output Energy at the Spallation Neutron Source
Evolution of the Superconducting Linac Output Energy at the Spallation Neutron Source Open
The SNS linac output energy has increased since the start of neutron production in FY2007. The various improvements that contributed to the increase of the linac output energy are LLRF/control system improvement, high voltage converter mod…
View article: Improving the Work Function of Nitrogen-Doped Niobium Surfaces for SRF Cavities by Plasma Processing
Improving the Work Function of Nitrogen-Doped Niobium Surfaces for SRF Cavities by Plasma Processing Open
Work function and surface chemistries of SiC-polished, electropolished, and nitrogen-doped niobium coupons were analyzed before and after plasma processing using a neon-oxygen gas mixture. These studies represent an initial enquiry into th…
View article: Update on Plasma Processing R&D for LCLS-II
Update on Plasma Processing R&D for LCLS-II Open
SRF cavities performance preservation is crucial, from vertical test to accelerator operation. Field emission is still one of the main problems to overcome and plasma cleaning has been proven successful by SNS, in cleaning field emitters a…
View article: Plasma Processing to Improve the Performance of the SNS Superconducting Linac
Plasma Processing to Improve the Performance of the SNS Superconducting Linac Open
An in-situ plasma processing technique has been developed at the Spallation Neutron Source (SNS) to improve the performance of the superconducting radio-frequency (SRF) cavities in operation. The technique uses a low-density reactive neon-…
View article: Ignition and monitoring technique for plasma processing of multicell superconducting radio-frequency cavities
Ignition and monitoring technique for plasma processing of multicell superconducting radio-frequency cavities Open
An in-situ plasma processing technique has been developed at the Spallation Neutron Source (SNS) to improve the performance of the superconducting radio-frequency (SRF) cavities in operation. The technique uses a low-density reactive neon-…