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Download BNMRfit istallation script Download BNMRfit Download BNMRminfit	Lateral Alignment 1. The beam spot should impinge on the sample normal to its surface (unless it is desired that the beam spot (i.e., the Li polarization) and sample surface be at angle with one another. 2. To correct for any misalignment between the surface of the sample and the beam, first have the beamstop removed so that radioactive beam is being delivered to the sample (do not linger around the spectrometer more than necessary). Second, on the EPICS laser control page, close the shutter to the laser. This will result in unpolarized Li being delivered to the sample. 3. The lack of nuclear polarization means that there should be no significant asymmetry in the count rates now, unless the sample is not parallel in the plane of the two counters. Read the L/R count rates from the visual scalers, or the strip tool and compare them to each other and the neutral beam monitors. 4. If there is a significant asymmetry in the absence of polarization, rotate the black knob slightly, left or right, to try to find a position which equalizes the rates in the 2 counters. Minor adjustments; otherwise the wings of the ladder will become disengaged with the cryostat. 5. Remove the laser shutter and have the beamstop replaced during vertical alignment.
	Page last modified: 07/23/09 02:45 by Andrew MacFarlane.