<title>FPGA-based TESLA cavity SIMCON DOOCS server design, implementation, and application</title>

A concise overview of the laboratorysol ution of the FPGA based TESLA cavity simulator and controller (SIMCON) is presented. The major emphasis is put in this paper ,on the high level part of the system. There were described the following steps of the system design and realisation: solution choice, design of system components, implementing the solutions, introduction of the application, initial analysis of the working application. The paper is a first description of the working DOOCS server for the FPGA based TESLA cavity SIMCON (which is a part of the LLRF subsystem). The data gathered fromthe work of the DOOCS server promise for the systemoptim isation possibilities. The server will be supplemented with the GUI in the next stepof this effort. Throughout the work we will refer to the debated systemas to the TESLA SIMCON DOOCS server or in ,short the “simcon server”. The hardware ,layer of the TESLA cavity SIMCON (to which the designed software refers to) was realized ina si ngle FPGA Virtex chipby Xi linx (XC2V3000 developmentboard byNal latech). Keywords:TESLA, Free Electron Laser, X-RayFEL, Superconducting cavitycont rol,LLRF system, FPGA, DOOCS, Internal Interface Middleware, virtual hardware control systems, C++,