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DSSC SIB

The Safety Interlock Board exposes the experimental conditions to the detector.

Two revisions are supported: firmware version 1 targeting the miniSDD sensor, and version 2 which supports both miniSDD and DEPFET sensor.

Decision Tree

The SIB uses a decision tree to establish whether the operating conditions are safe.
These are based on the qloop status, cable status, experiment conditions, temperature, humidity, and pressure. It is exposed as the decision property, where each field has a value of:

  • 0: ok
  • 1: error
  • 2: warning
  • 3: undefined

vssSum

This property exposes the sum of voltages across different ASIC power channels.
The detector has different levels of power (off, high voltage, source, ASIcs).
When vccSum equals to ~3 volts, we know that the detector is fully powered (ie. ASICs on).