XBOX 2 Interlocks Joseph Tagg XBOX 2 Interlocks

XBOX 2 Interlocks Joseph Tagg

XBOX 2 Interlocks Vac 10 e-5 serial Serial Modulator RF Valves Water HV Enable Ion. Pump Ion Controllers Vac 10 e-7 PXI Interlock FPGA logic

XBOX 2 Interlocks • Many independent interlock sources • Each can be defined in one of two ways – Normal: stops RF – Critical: stops RF and sends interlock to modulator • Possibility to add more if needed • Normal interlock status propagated through backplane and externally. Critical interlock status propagated externally

Interlock properties • Once set, needs an explicit signal to reset • Interlock FPGA logic runs as soon as powered and runs regardless of software state • Starts in interlock status and uses a watchdog to interlock if no communication from software within a second • Software configurable

Structure reset Interlock source Interlock latched Critical Interlock Status Interlock source Interlock latched OR Global Interlock Status

To do • Redundancy • Fail-safe mechanisms

Interlock sources and severity • • Breakdown: normal Vacuum <1 e-5: critical Watchdog elapses (software problem): critical Software: normal Water: critical RF valves: critical Modulator: critical