Pressure control system

This report is a description of the main project I worked on this sum- mer at CERN, in ALPHA group. It consist in a development of a system to control the pressure inside a cryostat which contains He liquid and an atmosphere of He. The control elements are valves and heaters in order to boyle the liquid He and increase the pressure. Opening and closing the valves can increase or decrease the pressure. Based on these devices we propose ideas and partial implememtation of these ideas to reach the goal. These project is divided in two main parts: software and hardware designs. Only the hardware was implmented. The software was partially studied.