A voltage divider is connected between the negative side or cathode and ground and {HEAD ~ an intermediate point} on the divider is connected to {TAIL ~ a focusing electrode} in the x ray tube for providing a focusing bias voltage 
is connected to
A voltage divider is connected between the negative side or cathode and ground and { HEAD ~ an intermediate point } on the divider is connected to { TAIL ~ a focusing electrode } in the x ray tube for providing a focusing bias voltage
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH