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9 papers · 2 filters
Etching Mechanism of Niobium in Coaxial Ar/Cl2 RF Plasma
J. Upadhyay, Do Im, S. Popović +3
The understanding of the Ar/Cl2 plasma etching mechanism is crucial for the desired modification of inner surface of the three dimensional niobium (Nb) superconductive radio freque…
Plasma Processing of Large Curved Surfaces for SRF Cavity Modification
J. Upadhyay, Do Im, S. Popović +3
Plasma based surface modification of niobium is a promising alternative to wet etching of superconducting radio frequency (SRF) cavities. The development of the technology based on…
Theoretical investigation of coherent synchrotron radiation induced microbunching instability in transport and recirculation arcs
Cheng-Ying Tsai, David Douglas, Rui Li +1
The coherent synchrotron radiation (CSR) of a high brightness electron beam traversing a series of dipoles, such as recirculation or transport arcs, may lead to the microbunching i…
Enhancement in Quality Factor of SRF Niobium Cavities by Material Diffusion
Pashupati Dhakal, Gianluigi Ciovati, Peter Kneisel +1
An increase in the quality factor of superconducting radiofrequency cavities is achieved by minimizing the surface resistance during processing steps. The surface resistance is the…
Primary Beam Steering Due to Field Leakage from Superconducting SHMS Magnets
Michael H. Moore, Buddhini P. Waidyawansa, Silviu Covrig +2
Simulations of the magnetic fields from the Super High Momentum Spectrometer in Hall C at Thomas Jefferson National Accelerator Facility show significant field leakage into the reg…
Simulation of Non-linear SRF losses derived from characteristic topography of etched and electropolished niobium surfaces
Chen Xu, Charles E. Reece, Michael J. Kelley
A simplified numerical model has been developed to simulate non-linear superconducting radiofrequency (SRF) losses on Nb surfaces. This study focuses exclusively on excessive surfa…