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User name R. Michaels
Log entry time 04:10:12 on March28,2010
Entry number 314109
keyword=Centering beam on Pb targetCentering the beam on the Lead / Diamond target #3 (bottom)
Changed raster to 10 x 4.8 (MCC units) ... nominal 4x4 (obs)
which is 5.4 x 11.1 amps.
Rates reduce from 14 kHz to 10 kHz
Run 26983 ... looks clean (fig 1).
Next, return to (0,0) and start a scan
MCZ1H04H.BDL -3800
MCZ1H04V.BDL 12.4
Run 26984 for the above. Not hitting frame here.
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Next go to (0,-3)
MCZ1H04H.BDL -3800
MCZ1H04V.BDL -1907
Run 26985 for the above. ~1/2 pattern is hitting frame !
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Next go to (0, +3)
MCZ1H04H.BDL -3800
MCZ1H04V.BDL 1932
Run 26986 for the above. Not hitting frame.
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Next go to (+3, 0)
MCZ1H04H.BDL -2100
MCZ1H04V.BDL 12.4
Run 26987. Good. Not hitting frame.
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Next go to (-3, 0)
MCZ1H04H.BDL -5500
MCZ1H04V.BDL 12.4
Run 26988. Good. Not hitting frame.
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Return to (0,0)
MCZ1H04H.BDL -3800
MCZ1H04V.BDL 12.4
Run 26989 .... Not hitting frame.
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The centered position is approx x,y = 0, +2.
So we go to V = +1290 (as it is 640 clicks per mm).
MCZ1H04H.BDL -3800
MCZ1H04V.BDL 1290
Run 26990 .... looks good ... see fig 2
Conclusion: x,y = 0,+2is reasonably centered and
we are not hitting frame. The target is a little
off (~2 mm) in vertical; perhaps the lifter
can be adjusted.
Recall, the copper hole is 3/4" x 1/2" (H x V)
which is 19 x 12.7 mm in size. Bigger in horizontal
to accomodate the target "swing".
FIGURE 1
FIGURE 2
