nmr_probes
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nmr_probes [2019/10/14 00:15] pereira [Manually setting Dipole Fields] |
nmr_probes [2019/10/14 00:19] pereira [Manually setting Dipole Fields] |
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| - | ==== Manually setting Dipole Fields (notes from Mathias Steiner with some extra info included) | + | ==== Manually setting Dipole Fields |
| + | (Based on notes from Mathias Steiner with some extra info included) | ||
| Let’s assume that you want to set the dipole I265DS (first dipole (D1) of S800 Spectrograph) to the rigidity (Brho) 3.7965 Tm (this works for any dipole in the S800) | Let’s assume that you want to set the dipole I265DS (first dipole (D1) of S800 Spectrograph) to the rigidity (Brho) 3.7965 Tm (this works for any dipole in the S800) | ||
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| * Use the “coarse” and “fine” knobs to select the field that you want (in T): 1.35454 T. By doing this, you are asking the NMR controller to just look at that field. | * Use the “coarse” and “fine” knobs to select the field that you want (in T): 1.35454 T. By doing this, you are asking the NMR controller to just look at that field. | ||
| * If the field of that dipole happens to be close enough to the field that the NMR controller is looking at, Bingo! You’ll most likely see a resonance in the oscilloscope. In the most likely situation, however, your magnet is far away from the NMR search window and you will see only a flat line in the oscilloscope. | * If the field of that dipole happens to be close enough to the field that the NMR controller is looking at, Bingo! You’ll most likely see a resonance in the oscilloscope. In the most likely situation, however, your magnet is far away from the NMR search window and you will see only a flat line in the oscilloscope. | ||
| - | * All you need to do now is to scan the magnetic field of your dipole, for instance using the NCS application with a knob box, and drive it towards the value that the NMR controller is looking at | + | * All you need to do now is to vary the magnetic field of your dipole, for instance using the "knob box" in the s800 computer **u6pc5**, and drive it towards the value that the NMR controller is looking at |
| * As you get close to that value, the oscilloscope will show the NMR resonance. Keep moving until the resonance is well centered. At that point, your dipole is set to the desired field | * As you get close to that value, the oscilloscope will show the NMR resonance. Keep moving until the resonance is well centered. At that point, your dipole is set to the desired field | ||
nmr_probes.txt · Last modified: 2024/06/01 16:35 by swartzj
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