Interlock and protection system for 1 MW Klystron RF system of LEHIPA

This paper discusses details of an `Interlock and Protection System for 1 MW Klystron Radio Frequency (RF) System of LEHIPA' which includes control, interlock and protection of high power DC supplies and other auxiliary systems connected to a 1 MW Klystron RF System. This system is exposed to high Radio Frequency Interference from the high power amplifier and other connected systems. Therefore it needs to be well isolated at all interfaces. Also, fast response of the order of very few microseconds is necessary for the protection of such a high power system. Fault tolerance and self diagnostic features are other key requirements of this application. The system needs to handle around 70 signals with mostly non-standard signal formats including frequency modulated optical signals. It also needs to simultaneously perform complex floating point calculations with critical timing requirements. Flexibility to accommodate few additional signals or slight variation in interlock algorithm is also another important requirement of this system as the application itself is still under development. These are not achievable using typical process control systems. Hence, tailor-made solutions for signal transmission, control hardware and software have been designed to meet these challenges. EMI/EMC qualification tests relevant to this application are also discussed.