Design and commissioning of vertical test cryostats for XFEL superconducting cavities measurements
- Wroclaw University of Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw (Poland)
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, D-22607Hamburg (Germany)
The European X-ray Free Electron Laser (XFEL), now under construction at DESY in Hamburg, will make an extensive use of 1.3 GHz superconducting cavities aimed at accelerating the electrons to the energy of 17.5 GeV. The cavities will be operated at 2 K with the use of saturated HeII. Prior to their assembly in accelerator cryomodules, the RF performance of the cavities will be cold-tested in two dedicated vertical cryostats. Each cryostat allows a simultaneous testing of 4 cavities mounted on a dedicated insert. The cryostats are equipped with external lines allowing their supply with liquid helium and further conversion of the helium into superfluid He II. The paper describes the test stand flow scheme, the technical key elements, including a recuperative heat exchanger, and the cold commissioning. The thermodynamic analysis of the cryostat cool down and steady-state operation is given. A Second Law of Thermodynamics based theoretical model of the heat exchanger performance, and the model experimental validation, is presented.
- OSTI ID:
- 22262720
- Journal Information:
- AIP Conference Proceedings, Vol. 1573, Issue 1; Conference: Cryogenic engineering conference, Anchorage, AK (United States), 17-21 Jun 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMMISSIONING
CONSTRUCTION
CRYOSTATS
DESIGN
ELECTRONS
FREE ELECTRON LASERS
HEAT EXCHANGERS
HELIUM
LIQUIDS
STEADY-STATE CONDITIONS
SUPERCONDUCTING CAVITY RESONATORS
THERMODYNAMICS
X RADIATION