A novel approach to characterizing the surface topography of niobium superconducting radio frequency (SRF) accelerator cavities

2011 ◽  
Vol 257 (11) ◽  
pp. 4781-4786 ◽  
Author(s):  
Hui Tian ◽  
Guilhem Ribeill ◽  
Chen Xu ◽  
Charles E. Reece ◽  
Michael J. Kelley
Keyword(s):  
Radio Frequency ◽  
Surface Topography ◽  
Novel Approach ◽  
Superconducting Radio Frequency

scholarly journals Three-dimensional simulations of the surface topography evolution of niobium superconducting radio frequency cavities

2014 ◽  
Vol 29 (2) ◽  
pp. 97-101
Author(s):  
Branislav Radjenovic ◽  
Petar Belicev ◽  
Marija Radmilovic-Radjenovic
Keyword(s):  
Radio Frequency ◽  
Surface Topography ◽  
Scaling Law ◽  
Three Dimensional ◽  
Anisotropic Etching ◽  
Root Mean Square Roughness ◽  
Exponential Factor ◽  
Isotropic Etching ◽  
Superconducting Radio Frequency ◽  
Three Dimensional Simulations

This paper contains results of the three-dimensional simulations of the surface topography evolution of the niobium superconducting radio frequency cavities during isotropic and anisotropic etching modes. The initial rough surface is determined from the experimental power spectral density. The simulation results based on the level set method reveal that the time dependence of the root mean square roughness obeys Family-Viscek scaling law. The growth exponential factors b are determined for both etching modes. Exponential factor for the isotropic etching is 100 times lower than that for the anisotropic etching mode reviling that the isotropic etching is very useful mechanism of the smoothing. [Projekat Ministarstva nauke Republike Srbije, br. O171037 i br. III45006

Development of a 1497-MHz, 13.5-kW Continuous-Wave Magnetron for Superconducting Radio Frequency Accelerator

2021 ◽  
pp. 1-9
Author(s):  
Wenliang Li ◽  
Pengjiao Zhang ◽  
Bowen Zhou ◽  
Hong Zhang ◽  
Youchun Liu ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Continuous Wave ◽  
Superconducting Radio Frequency

scholarly journals Long lifetime of bialkali photocathodes operating in high gradient superconducting radio frequency gun

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
E. Wang ◽  
V. N. Litvinenko ◽  
I. Pinayev ◽  
M. Gaowei ◽  
J. Skaritka ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Electron Beams ◽  
Spot Size ◽  
Laser Spot ◽  
Laser Spot Size ◽  
High Quantum Efficiency ◽  
High Brightness ◽  
High Charge ◽  
Superconducting Radio Frequency ◽  
Long Lifetime

AbstractHigh brightness, high charge electron beams are critical for a number of advanced accelerator applications. The initial emittance of the electron beam, which is determined by the mean transverse energy (MTE) and laser spot size, is one of the most important parameters determining the beam quality. The bialkali photocathodes illuminated by a visible laser have the advantages of high quantum efficiency (QE) and low MTE. Furthermore, Superconducting Radio Frequency (SRF) guns can operate in the continuous wave (CW) mode at high accelerating gradients, e.g. with significant reduction of the laser spot size at the photocathode. Combining the bialkali photocathode with the SRF gun enables generation of high charge, high brightness, and possibly high average current electron beams. However, integrating the high QE semiconductor photocathode into the SRF guns has been challenging. In this article, we report on the development of bialkali photocathodes for successful operation in the SRF gun with months-long lifetime while delivering CW beams with nano-coulomb charge per bunch. This achievement opens a new era for high charge, high brightness CW electron beams.

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