nmr_probes
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nmr_probes [2019/10/14 00:28] pereira [Manually setting Dipole Fields] |
nmr_probes [2019/10/17 10:32] pereira [Manually setting Dipole Fields] |
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| * Get access to the NMR controller in the mezzanine level of S3 vault (see figure below). Push the “SEARCH LOCAL” button to take control out of REMOTE mode. | * Get access to the NMR controller in the mezzanine level of S3 vault (see figure below). Push the “SEARCH LOCAL” button to take control out of REMOTE mode. | ||
| * Select the right probe by turning the “probe knob” (see figure below). Remember, each dipole has two probes: probe 4, covers fields in the range 0.34 – 1.05 T, and probe 5 covers fields in the range 0.7–2.1 T. In this case, we should set the knob of the Spectrograph controller to position B | * Select the right probe by turning the “probe knob” (see figure below). Remember, each dipole has two probes: probe 4, covers fields in the range 0.34 – 1.05 T, and probe 5 covers fields in the range 0.7–2.1 T. In this case, we should set the knob of the Spectrograph controller to position B | ||
| - | * The list of probes that can be selected with the knobs are, for the Spectrograph: | + | * The list of probes that can be selected with the knobs are, for the Spectrograph: |
| * 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. | ||
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| * Set EPICS channel **I265DS_MAG.BSET** to 13.5454 (note, the default value of this channel is always an (impossible) 9999.1111, which is ignored. Typing 13.5454 will cause the magnet to go to 257.577 A, and **I265DS_MAG.BSET** goes back to 9999.1111. Setting the magnet this way will get you to plus or minus half a percent of where you want to be. | * Set EPICS channel **I265DS_MAG.BSET** to 13.5454 (note, the default value of this channel is always an (impossible) 9999.1111, which is ignored. Typing 13.5454 will cause the magnet to go to 257.577 A, and **I265DS_MAG.BSET** goes back to 9999.1111. Setting the magnet this way will get you to plus or minus half a percent of where you want to be. | ||
| * At that point, the quickest way may be to use the FINE knob in the NMR controller to find the actual field value. Just turn the knob until the resonance is centered in the oscilloscope, | * At that point, the quickest way may be to use the FINE knob in the NMR controller to find the actual field value. Just turn the knob until the resonance is centered in the oscilloscope, | ||
| - | * Once you know the value of the field, type it (in Tesla) into the EPICS channel **I265DS_MAG.FELD**. Note that is what Daniel' | + | * Once you know the value of the field, type it (in Tesla) into the EPICS channel **I265DS_MAG.FELD**. Note that this is what Daniel' |
| * Having done that, you can use the BARNEY ' | * Having done that, you can use the BARNEY ' | ||
| * Repeat until satisfied. | * Repeat until satisfied. | ||
nmr_probes.txt · Last modified: 2024/01/29 10:51 by swartzj
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