CERN Accelerating science

Article
Title	The Radiation Safety Interlock System for Top-Up Mode Operation at NSRRC
Author(s)	Chen Chien Rong ; Chang, Fu-Dong ; Kao, Sheau-Ping ; Liu, Joseph ; Sheu, Rong-Jiun ; Wang, Jau-Ping
Affiliation	(NSRRC, Hsinchu)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3328
Subject category	Accelerators and Storage Rings
Abstract	The radiation safety interlock systems of NSRRC have been operated for more than a decade. Some modification actions have been implemented in the past to perfect the safe operation. The machine and its interlock system were originally designed to operate at the decay mode. Recently some improvement programs to make the machine injection from original decay mode to top-up mode at NSRRC has initiated. For users at experimental area the radiation dose resulted from top-up re-fill injections where safety shutters of beam-lines are opened will dominate. In addition to radiation safety action plans such as upgrading the shielding, enlarging the exclusion zones and improving the injection efficiency, the interlock system for top-up operation is the most important to make sure that injection efficiency is acceptable. To ensure the personnel radiation safety during the top-up mode, the safety interlock upgrade and action plans will be implemented. This paper will summarize the original design logic of the safety interlock system. Historical modification actions for this system will be mentioned. New design logic to ensure radiation safety for top-up mode operation will be discussed.