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Download BNMRfit istallation script Download BNMRfit Download BNMRminfit	Vertical Alignment 1. Use the CCD camera ($\beta$ NMR-MX5; see section (INSERT LINK TO ON LINE CAMERA MANUAL HERE)) to obtain an image of the back side of the ladder at the sample position (be sure that the program is receiving the signal from the polarimeter camera). The torus of LCD lights surrounding the camera will probably need to be illuminated to provide sufficient background light for an image. Or, the cover plates at the end of this section of the beam line may be removed to introduce ambient light. Using the photometry tool (View > Photometry) determine the (x,y) co-ordinate that corresponds to the center of newly loaded sample. 2. Open (File $->$ Load) the most recent stored image of the polarimeter beam-spot taken with sapphire in the sample position (see below). Using the photometry tool determine the (x,y) co-ordinate that corresponds to the center of the beam spot. Elements of the beam line may be 'tweaked' during the course of experiments, so be sure to use the most recent image. The co-ordinates of the center should also be recorded in the bNQR logbook. [If you are unsure of the exact co-ordinates, you may want to place the sapphire in the sample position (part A above), have the beamstop removed, and image the beam-spot with the camera (no additional light required).] 3. Compare the co-ordinates for the center of the present sample with those of the beam-spot image. Determine if the sample should be raised or lowered (or neitrher) relative to the beam-spot. Using the remote control for the motor, drive the entire cryostat 'UP" or 'DOWN' as desired. Small, incremental changes are recommended. (Be careful, depending on the orientation of the CCD camera, UP and DOWN may be reversed!). 4. Re-image the sample after cryostat adjustment and continue to adjust as needed.
	Page last modified: 07/23/09 02:45 by Andrew MacFarlane.