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Steps to initiate radiation
Function of diode D 29
A: Diode working properly
B: Diode disabled (open circuit)
Signal of failure of
the beam
monitoring system
Interlock not activated:
cannot prevent
irradiation
Signal of failure of
the beam
monitoring system
Interlock activated
prevents irradiation
Diode fails (open
circuit) signal not
transferred
Signal is
transferred
through the diode
A
B
Sequence of steps to initiate
irradiation includes a test of
beam monitoring chambers,
but …
… the information about
missing power supply can not
pass through faulty diode …
… interlock is not informed
that monitoring chambers are
missing
… and gives green light to the
next step in the sequence
towards irradiation
28
2016-10-05
T Knöös
X