journal article·2017-11-01Open access

Analysis of the cool down related cavity performance of the European X-Ray Free Electron Laser vertical acceptance tests

M. Wenskat, J. Schaffran

AIP Advances· Volume 7· Issue 11

Abstract

For the European X-Ray Free Electron Laser (XFEL) cavity production, the cold radio-frequency (RF) test of the cavities at 2K after delivery from the two vendors was the mandatory acceptance test. It has been previously reported, that the cool down dynamics of a cavity across Tc has a significant influence on the observed intrinsic quality factor Q0, which is a measure of the losses on the inner cavity surface. A total number of 367 cool downs is used to analyze this correlation and we show that such a correlation is not observed during the European XFEL cavity production.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Particle Accelerators and Free-Electron Lasers · Particle accelerators and beam dynamics · Magnetic confinement fusion research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Deutsches Elektronen Synchrotron , 22607 Hamburg, Germany

References (19)

Show source-provided references
1. Production of superconducting 1.3-GHz cavities for the European x-ray free electron laser10.1103/physrevaccelbeams.19.092001 ↗
2. Performance in the vertical test of the 832 nine-cell 1.3 GHz cavities for the European x-ray free electron laser10.1103/physrevaccelbeams.20.042004 ↗
3. Review of models of RF surface resistance in high gradient niobium cavities for particle accelerators
4. Impact of cool down conditions on Tc on the superconducting RF cavity quality factor10.1103/physrevstab.16.102002 ↗
5. Dependence of the residual surface resistance of superconducting radio frequency cavities on the cooling dynamics around Tc10.1063/1.4875655 ↗
6. Flux trapping in superconducting accelerating cavities during cooling down with a spatial temperature gradient10.1093/ptep/ptw049 ↗
7. Model of flux trapping in cooling down process
8. Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through Tc10.1103/physrevaccelbeams.19.082001 ↗
9. On trapped flux losses: Expulsion and dissipation mechanisms description
10. Design and commissioning of vertical test cryostats for XFEL superconducting cavities measurements
11. Cryogenics of European XFEL accelerator module test facility
12. Full cryogenic operation of AMTF-the first year
13. Experience with cryogenic operation of accelerator module test facility during testing of one third of XFEL cryomodules10.1088/1757-899x/101/1/012139 ↗
14. Design parameters and commissioning of vertical inserts used for testing the XFEL superconducting cavities10.1063/1.4860705 ↗
15. Characteristics of Russian carbon resistance (TVO) cryogenic thermometers
16. 2008
17. Measurements of the magnetic shielding for the TTF bath cryostat
18. Magnetic shielding of the TESLA TTF superconducting cavities
19. Electron mean-free-path dependence of the vortex surface impedance