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playground:nmr
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playground:nmr [2012/03/08 18:06] jacobs |
playground:nmr [2012/03/09 09:31] jacobs |
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| ===== NMR Setup ===== | ===== NMR Setup ===== | ||
| - | ** NMR Setup ** | + | ** NMR Fluxmeter ** |
| - Depress POWER switch if not illuminated. | - Depress POWER switch if not illuminated. | ||
| Line 9: | Line 9: | ||
| - Recycle the analyzing magnet if needed. This is done using the RECYCLE button on the analyzing magnet control window. | - Recycle the analyzing magnet if needed. This is done using the RECYCLE button on the analyzing magnet control window. | ||
| - Set the analyzing magnet power supply to a current slightly lower than the current predicted for this energy. | - Set the analyzing magnet power supply to a current slightly lower than the current predicted for this energy. | ||
| - | - Set the TUNING control to about mid range on its 10 turn control. Rotate counterclockwise until stop then 5 turns clockwise. | + | - Set the TUNING VERNIER control to about mid range on its 10 turn control. Rotate counterclockwise until stop then 5 turns clockwise. |
| - Select a frequency about 1% less than the frequency desired for the beam energy. | - Select a frequency about 1% less than the frequency desired for the beam energy. | ||
| - In the light yellow (Tandem) window type the command nmrgoto 1234.567 where 1234.567 is the frequency calculated in the previous step. | - In the light yellow (Tandem) window type the command nmrgoto 1234.567 where 1234.567 is the frequency calculated in the previous step. | ||
| - | - Follow the instructions given in the TANDEM window. You may have to move the nmr RANGE switch to a new range. | + | - Follow the instructions given in the TANDEM window. You may have to move the NMR TUNING RANGE switch to a new range. |
| - | - If requested to do so, switch the nmr RANGE switch to the requested range, then hit ENTER. | + | - If requested to do so, switch the NMR TUNING RANGE switch to the requested range, then hit ENTER. |
| - | - The TANDEM window will inform you of how many steps needed to get close to the frequency you entered. | + | - The TANDEM window will inform you of how many steps needed to move approximately to the frequency you entered. |
| - | - When the nmr advances this number of steps it will inform you of the frequency the nmr has moved to at this step position. | + | - When the NMR advances this number of steps it will inform you of the frequency the NMR has moved to at this step position. |
| - | - If this frequency is not close enough to the desired frequency, repeat the nmrgoto command and it should get closer. The nmr moves to the entered frequency by estimating the number of steps needed to advance from the current position and then moving that number of steps. The closer you are to the desired frequency, the closer the end result will be. | + | - If this frequency is not close enough to the desired frequency, repeat the nmrgoto command and it should get closer. The NMR moves to the entered frequency by estimating the number of steps needed to advance from the current position and then moving that number of steps. The closer you are to the desired frequency, the closer the end result will be. |
| - | - Now that the nmr is set to a frequency slightly lower than the frequency you want the magnet to be set to we can begin increasing the analyzer magnet control upward toward the current that will show a resonance on the nmr. Remember that because of magnet hysteresis, we can only increase the magnet current from this point on. If we decrease the magnet current we will have to recycle the magnet and start over for an accurate nmr value. | + | - Now that the NMR is set to a frequency slightly lower than the frequency you want the magnet to be set to we can begin increasing the analyzer magnet control upward toward the current that will show a resonance on the NMR. Remember that because of magnet hysteresis, we can only increase the magnet current from this point on. If we decrease the magnet current we will have to recycle the magnet and start over for an accurate NMR flux value. |
| - | - | + | |
| + | * {{HVEC_NMR.pdf|Original HVEC NMR Manual. Main frequency adjustment control and tracking feature now obsolete. See above new procedures.}} | ||
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playground/nmr.txt · Last modified: 2023/05/08 10:42 by carter
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