LLRF CHARACTERISATION OF THE DARESBURY INTERNATIONAL CRYOMODULE

摘要

The 2-cavity Superconducting RF (SRF) Linac cryomodule of the Accelerators and Lasers in Combined Experiments (ALICE) machine located at Daresbury Laboratory will be replaced by a new International Energy Recovery Linac (ERL) Cryomodule in early 2013. This has been developed in collaboration with Stanford and Cornell Universities, LBNL and FZD Rossendorf. The improved 7-cell, 1.3 GHz SRF cavities will be characterised and compared with the original 9-cell cavities. A digital Low Level RF (LLRF) system using the LLRF4 board developed by Larry Doolittle has been developed at Daresbury Laboratory and has been installed on the upgraded cryomodule. An initial RF test has been performed in April 2013 with the digital system being configured in a self-excited loop so that microphonic sensitivity and Lorentz force detuning can be analysed. This paper sets out to discuss the qualification process, testing and results of the upgraded cryomodule installation.