Serial testing of XFEL cryomodules: results of the cryogenic heat load measurements

T Böckmann,T Schnautz,J Swierblewski,P Halczynski,Y Bozhko,W Gay,B Petersen,S Putselyk,M Sienkiewicz

doi:10.1088/1757-899x/278/1/012184

Abstract

The European X-ray Free Electron Laser (XFEL) is in operation at DESY. The superconducting XFEL linac will produce pulsed electron beam at an energy of 17.5 GeV. The linac consists of 768 superconducting niobium 1.3 GHz nine cell cavities and 96 superconducting magnet packages assembled in 96 cryomodules. Each cryomodule is 12 m long and includes a 2 K helium II bath circuit for the cavities, and 5/8 and 40/80 K thermal radiation shields. Before being installed in the XFEL linac tunnel all cryomodules were tested in the Accelerator Module Test Facility (AMTF.)In this paper methods and results of static and dynamic heat load measurements of all XFEL cryomodules are reported. A comparison with first integral heat load measurements in the XFEL linac is given.

Highlights

The European X-ray Free Electron Laser (XFEL) is in operation at DESY
Before being installed in the XFEL linac tunnel all cryomodules were tested in the Accelerator Module Test Facility (AMTF.) In this paper methods and results of static and dynamic heat load measurements of all XFEL cryomodules are reported
These values are based on the XFEL Refrigerator Budget (XRB) for the linac, which were theoretically calculated and experimentally verified on prototype cryomodules [7] and the refrigerator capacity design values (XRC), including 50% margin

Summary

Introduction

The European X-ray Free Electron Laser (XFEL) is in operation at DESY. The superconducting XFEL linac will provide a pulsed electron beam energy of 17.5 GeV. Before being installed in the XFEL linac tunnel all cryomodules were tested in the Accelerator Module Test Facility (AMTF.) In this paper methods and results of static and dynamic heat load measurements of all XFEL cryomodules are reported. A comparison with first integral heat load measurements in the XFEL linac is given.

Results

Conclusion