Fermilab, Batavia
DESY, Hamburg
A 4-cavity 3.9 GHz cryomodule has been constructed at Fermilab and delivered to DESY. Its intended use is to linearize the non-linear beam energy-time profile produced by the 1.3 GHz accelerating gradient and thus improve the operating characteristics of FLASH for its users. First cold testing of the module is expected in the near future prior to its installation. We will report on the performance of the cavities, assembly and transport of the module as well as anticipated testing, installation, and commissioning plans.
DESY, Hamburg
The 9-cell TESLA type superconducting cavity based accelerating module is one of the key elements of the successfully operating FLASH linear accelerator at DESY as well as of the XFEL. The next FLASH 1.2 GeV upgrade modules and new XFEL prototype module have been assembled and tested on Cryo Module Test Bench (CMTB) at DESY. Results of these tests are presented and discussed.
INFN/LASA, Segrate (MI)
DESY, Hamburg
The tuning system for XFEL SRF cavities is a device based on a double lever driven by a stepping motor with a gear box and a screw-nut system. The cavity is stretched by the tuner thus changing its resonant frequency. The tuner is also provided with fast tuning capability by means of two piezoceramic actuators, that compensate for cavity deformations that are responsible of frequency detuning. During industrial phase is mandatory to ensure a correct tuner assembling both for mechanical parts and actuators. This is provided by an automated device able to check the correctness of piezo-tuner installation on the cold mass string first and after installation in the cryostat, with very simple mounting requirements for the Module Assembling Team. In this paper this device is fully described, and first results on prototypes are shown together with its operation strategy.