scholarly journals Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics aroundTc

2014 ◽  
Vol 115 (18) ◽  
pp. 184903 ◽  
Author(s):  
A. Romanenko ◽  
A. Grassellino ◽  
O. Melnychuk ◽  
D. A. Sergatskov
Keyword(s):  
Radio Frequency ◽  
Surface Resistance ◽  
Superconducting Radio Frequency

Superconducting Radio-Frequency Fundamentals for Particle Accelerators

2012 ◽  
Vol 05 ◽  
pp. 119-146 ◽  
Author(s):  
Alex Gurevich
Keyword(s):  
Radio Frequency ◽  
Quality Factor ◽  
Electromagnetic Fields ◽  
Surface Resistance ◽  
Particle Accelerators ◽  
Superconducting Radio Frequency ◽  
Srf Cavities

An overview of fundamentals of superconductors under radio-frequency electromagnetic fields in particle accelerators is given, with emphasis on intrinsic physics and materials mechanisms which limit the performance of the superconducting radio-frequency (SRF) resonator cavities. Multiscale mechanisms which control the surface resistance and the quality factor of the SRF cavities at low and high rf fields are discussed. We also discuss possible ways of pushing the limit of the SRF performance by materials impurities and multilayer nanostructuring which may open up opportunities of using materials other than Nb to significantly increase the maximum accelerating fields and improve the performance of the SRF cavities operating at 4.2 K.

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.

Correlation of thermally stimulated luminescence with radio frequency surface resistance of high‐temperature superconductors

1989 ◽  
Vol 55 (10) ◽  
pp. 1038-1040 ◽  
Author(s):  
D. W. Cooke ◽  
B. Bennett ◽  
E. R. Gray ◽  
R. J. Houlton ◽  
W. L. Hults ◽  
...  
Keyword(s):  
High Temperature ◽  
Radio Frequency ◽  
Surface Resistance ◽  
High Temperature Superconductors ◽  
Thermally Stimulated Luminescence
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