IPN, Orsay
INFN/LASA, Segrate (MI)
GANIL, Caen
Accelerator Driven system (ADS) are being considered for their potential use in the transmutation of nuclear waste. Such a device typically requires a 600MeV to 1GeV accelerator delivering a beam of few mA intensity. Because of the induced thermal stress to the subcritical core, the high-power proton LINAC will have to fulfill stringent reliability requirements, with less than a dozen of unwanted beam trips per year. One working package of the EUROTRANS project* is dedicated to the design, realization and tests of a prototypical cryomodule for the LINAC high energy section equipped with a 5 cells superconducting cavity and its tuning system. Developed at INFN, this RF cryogenic device will be tested at IPNO, early 2010. We will describe the status of the R&D activities, regarding the cryogenic system, the cavity, the power coupler, the doorknob transition and the RF source developed by Thales Electron Devices. Then, we will review the foreseen experimental reliability characterization of the cryomodule with its RF control system in nominal operating conditions.
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.
INFN/LASA, Segrate (MI)
DESY, Hamburg
Three superconducting 3.9 GHz cavity prototypes have been fabricated for the XFEL linac injector, with minor modifications to the RF structures built by FNAL for the FLASH linac. This paper describes the production procedures and RF preparation experience, the chemical processing and the plans for the vertical tests at INFN Milano for the characterization of the structures.