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playground:pulsing
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playground:pulsing [2013/05/24 16:11] carter |
playground:pulsing [2019/07/17 10:39] carter |
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| ** Starting and Tuning Pulsed and Bunched Beam ** | ** Starting and Tuning Pulsed and Bunched Beam ** | ||
| - | - Start up source and described in the [[playground:sputter|Sputter Source]] or [[playground:alpha|Duoplasmatron Source]] instructions. | + | - Start source as described in the [[playground:sputter|Sputter Source]] or [[playground:alpha|Duoplasmatron Source]] instructions. |
| - With the low energy cup in, tune for maximum current using the proper tuning devices for the given source. | - With the low energy cup in, tune for maximum current using the proper tuning devices for the given source. | ||
| - Set auxiliary width at maximum. | - Set auxiliary width at maximum. | ||
| - Turn on oscillator -- beam current will drop. | - Turn on oscillator -- beam current will drop. | ||
| - | - Turn 2Y down -- look for peak in pulsed beam (its easier to find the correct peak if the auxiliary width is large). You should normally expect to find the peak somewhere around 4.0 if you start from 5.0 . If you reduce 2Y (after a D.C. tune-up) , the first peak you see is the correct one. | + | - Turn 2Y down -- look for peak in pulsed beam (its easier to find the correct peak if the auxiliary width is large). When you see 10% rise in LE current, adjust chopper phase for maximum LE current then continue dropping 2Y until first maximum is seen in LE current. You should normally expect to find the peak somewhere around 4.0 if you start from 5.0 . If you reduce 2Y (after a D.C. tune-up) , the first peak you see is the correct one. If you continue to reduce 2Y you will see the retrace peak. You should return to the first peak if you locate the second (lower 2Y) peak. |
| - Adjust 2X for maximum current for the maximum current. You usually need to adjust both 2Y and 2X together to find the maximum. | - Adjust 2X for maximum current for the maximum current. You usually need to adjust both 2Y and 2X together to find the maximum. | ||
| - Change to f/2. Adjust the chopper phasing for maximum current. The beam current should drop by a factor of 2 if you are on the proper peak. For best current tune both the 2X and chopper phasing. | - Change to f/2. Adjust the chopper phasing for maximum current. The beam current should drop by a factor of 2 if you are on the proper peak. For best current tune both the 2X and chopper phasing. | ||
playground/pulsing.txt ยท Last modified: 2023/01/27 07:11 by carter
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