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Download BNMRfit istallation script Download BNMRfit Download BNMRminfit	Sodium cell interlocks The sodium cell heaters cannot operate if vacuum is lost, water cooling to the cell is off, or the collector or trap temperatures rise above 175C. The reservoir heater goes off if the reservoir temperature rises above the nozzle temperature, otherwise the nozzle could clog up with condensed Na. The trap and collector temperatures are measured by two thermocouples. The interlocks latch and must be reset by the operator before the heaters can be switched on again. The sodium cell bias (up to 10 kV) cannot be applied unless the high voltage enclosure is properly installed and the beam line is under vacuum. Once the enclosure is locked in place using two keys, the keys are removed from the locks and inserted into a transfer unit. The master key can then be removed from the transfer unit and inserted into the key switch. Turning the master key in the key switch closes the interlock circuits to the HV and isolation transformer power supplies. It is not physically possible to turn the enclosure lock keys without the enclosure in place
	Page last modified: 07/23/09 02:45 by Andrew MacFarlane.