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Download BNMRfit istallation script Download BNMRfit Download BNMRminfit	Sodium Handling at the LEBT Polarized Beam Line at ISAC 3.3Unpolarized 8Li+ or other alkali-metal ion beams are neutralized in a sodium vapor cell, with typically 50$\%$ efficiency (although over $90\%$ efficiency is possible at high Na vapour densities). The jet-type cell construction, which minimizes the cell length while efficiently trapping the sodium, is shown in Figure 1. Sodium vapor flows from the reservoir, which is typically at 390 C, through a pipe and nozzle, at about 410 C, forming a jet target that is condensed by a collector, which is at less than 175 C. The liquid Na drains under gravity back to the reservoir, through a trap also maintained below 175 C. The relatively cool trap prevents the backflow of vapor from the reservoir into the condenser, since the vapor pressure of Na is negligible below 175 C. The heater leads to the reservoir and nozzle are water-cooled. The collector and trap are air-cooled. The air flow rate is controlled by manually operated metering valves. A previous active feedback system on the air cooling has been removed.
	Page last modified: 07/23/09 02:45 by Andrew MacFarlane.