Abstract
Korea Superconducting Tokamak Advanced Research (KSTAR) has three interlock systems. The Supervisory Interlock System (SIS) protects against damage to machines from abnormal events. The Fast Interlock System (FIS) prevents the destruction of the internal vacuum components from the uncontrolled plasma and heating beams. The Personal Safety Interlock (PSI) keeps humans from harmful environments and conditions.This paper presents the evolution of the KSTAR SIS and FIS operations since 2009. The SIS was implemented for KSTAR in 2007 and optimized the critical conditions and actuator actions to improve and avoid issues. The significant changes in the KSTAR interlocks are removing and changing the inappropriate interlock conditions and adding the required conditions to improve efficiency and fit the advanced experimental environments.The first implemented FIS independent of the Central Control System (CCS) in 2009 continues to upgrade its hardware and software to enable the interlocks and actions with high time resolution until 2017. The machine protection logic in the FIS evaluated and developed to reduce operational failures.This paper analyses the modified conditions for interlocks, the actions to protect machines, and their effects.
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