<title>DSP-based system for advanced radiation tolerant algorithms evaluation</title>

Abstract

Radiation produced during the operation of high energy linear accelerators can pose a real danger to electronic devices. The electronics of X-Ray Free Electron Laser (X-FEL) accelerator will be placed in the main tunnel, therefore the system will be subjected to gamma bremsstrahlung radiation and neutrons [1].Digital Signal Processors (DSPs) and high-density Field Programmable Gate Array (FPGA) devices are used to design the control system of the X-FEL accelerator. Influence of gamma on electronic systems can be decreased by implementation of suitable shielding. Despite the plurality of available methods protecting digital devices against neutrons influence, designing complex systems dedicated to operate in radiation environments is still a challenge. The mechanisms improving immunity of the digital systems can be achieved as an implementation of hardware redundancy or software algorithms modifications [2][3][4][5]. In both cases additional resources are necessary.This paper highlights a DSP-based development environment, based on Texas Instruments TM5320C6713 digital signal processor, dedicated to test software in radioactive environment. The master-board of the system is connected to the slave controller through ETA 485 differential interface, which assures reliable transmission for a long distance even in EMI polluted area. The developed programs can be downloaded through the interface and stored in a Flash memory.Methods allowing improving the immunity to neutrons generated events, particularly Single Event Upsets (SEUs), were developed using triple redundancy, Hamming codes and doubled multipliers. Different experiments were carried out in Linac II accelerator to evaluate the designed programs and examine the whole system.