Progress Report on SIMULINK Modelling of RF Cavity Control for SPL Extension to LINAC4 Theory and Analysis behind Simulation Results of SPL Model Using I/Q Components in SIMULINK to Date, Including Lorentz Force Effects and Multiple Cavities Driven by Single Feedback Loop

In the context of a luminosity upgrade for the LHC within the coming years, works have started on LINAC4 to provide an infrastructure for updating the LHC supplier chain. In order to achieve energy levels and particles per bunch necessary for the expected rate of events at LHC detectors and related experiments, a project proposal is underway for an appended Superconducting Proton LINAC (SPL) that will run from the normal conducting LINAC4 and LP-SPL onto the LHC supplier chain. Thus, the SPL will have two main functions: Firstly, to provide H- beam for injection into the PS2 which is compatible with LHC luminosity. For this purpose the SPL will accelerate the output beam of LINAC4 from 1GeV to 4GeV,removing, at the same time, the necessity for PSB operation in the LHC supply chain. Secondly, it will provide an infrastructure upgradeable to meet the needs of all potential high-power proton users at CERN (EURISOL) and possibly neutrino production facilities. For high-power applications of this nature the SPL will need to provide a 5GeV beam whose time-structure can be tailored to meet the specifications of each application. As of now, the design of the SPL is planned to make use of high-Q, 5-cell superconducting elliptical cavities pulsed at a resonant frequency of 704.4 MHz by multi-megawatt klystrons with a maximum repetition rate of 50 Hz, accelerating a 20/40 mA H- beam with a maximum field of approximately 25 MV/m, depending on the output requirements of different applications. In the context of the development of a proposal for this conceptual design by mid-2011, this report consists on the progress to date of a SIMULINK model that follows the design specifications and will provide a useful means to foresee any issues that might arise with construction of the SPL, as well as a relatively precise feel for the costs involved in terms of power consumption and technology.