nmr_probes
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nmr_probes [2023/06/09 14:28] swartzj |
nmr_probes [2024/01/29 10:51] (current) swartzj [Error message: "/srv/s3/nmr-logs/spectrograph.log is not accessible"] |
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| ===== Description ===== | ===== Description ===== | ||
| - | The NMR running programs for both the S800 analysis line and spectrograph dipoles can be started by logging in to exp-s3-nmr.ftc (10.40.230.111) accessible from the EXP network, namely, from a whatever | + | The NMR running programs for both the S800 analysis line and spectrograph dipoles can be started by logging in to exp-s3-nmr.ftc (10.40.230.111) accessible from the EXP network, namely, from any computer connected to the EXP network, |
| $ ssh [your-user-name-on-EXP]@exp-s3-nmr -Y | $ ssh [your-user-name-on-EXP]@exp-s3-nmr -Y | ||
| Line 15: | Line 15: | ||
| and typing, for the analysis line dipoles | and typing, for the analysis line dipoles | ||
| - | $ /usr/bin/wish / | + | $ /usr/bin/wish8.6 |
| and for the spectrograph dipoles | and for the spectrograph dipoles | ||
| - | $ /usr/bin/wish / | + | $ /usr/bin/wish8.6 |
| + | **Note that it is not simply wish anymore but wish8.6.** | ||
| Now press start on the GUI, which is shown below, and you should see a field reading. Sometimes the initialization of these applications fail. In that case check section [[nmr probes# | Now press start on the GUI, which is shown below, and you should see a field reading. Sometimes the initialization of these applications fail. In that case check section [[nmr probes# | ||
| Line 27: | Line 28: | ||
| ===== Terminating processes run by another user ===== | ===== Terminating processes run by another user ===== | ||
| - | A solution has been implemented for the case where one user needs to run the NMR software via the 'wish' command, but another user is already running it. | + | A solution has been implemented for the case where one user needs to run the NMR software via the 'wish8.6' command, but another user is already running it. |
| - | If a user is running 'wish' (usually 2 processes, one for analysis and one for spectrograph) and another user needs to run it instead, they can do the following: | + | If a user is running 'wish8.6' (usually 2 processes, one for analysis and one for spectrograph) and another user needs to run it instead, they can do the following: |
| * Log on to exp-s3-nmr virtual machine (as described above) | * Log on to exp-s3-nmr virtual machine (as described above) | ||
| - | * Type 'ps aux | grep wish' to find out the name of the user that is running | + | * Type 'ps aux | grep wish8.6' to find out the name of the user that is running |
| - | * Let's suppose user ' | + | * Let's suppose user ' |
| - | * This will stop both wish processes that are running as user ' | + | * This will stop both wish8.6 |
| - | * Now user ' | + | * Now user ' |
| In short, | In short, | ||
| - | $ ps aux | grep wish | + | $ ps aux | grep wish8.6 |
| - | $ sudo -u usernameRunningWish | + | $ sudo -u usernameRunningWish8.6 |
| | | ||
| and you should be able to run the NMR software. | and you should be able to run the NMR software. | ||
| Line 110: | Line 111: | ||
| * Simply turn it off, wait few seconds, and turn it back on | * Simply turn it off, wait few seconds, and turn it back on | ||
| + | ==== Error message: "/ | ||
| + | |||
| + | * In a new terminal, ssh to yourname@exp-s3-nmr, | ||
| + | * mv spectrograph.log spectrograph-yourname.log | ||
| + | * Now close the error message window and you should not have this problem anymore. | ||
| + | |||
| + | ==== NMR reading sometimes takes too long (> 30 min) ==== | ||
| + | |||
| + | This is typically caused by one of two possible factors: | ||
| + | |||
| + | 1. The signal is weak, and so the NMR " | ||
| + | * This can be alleviated by changing the NMR thresholds (it can be done for each magnet in the analysis line, or for both magnets in the spectrograph). | ||
| + | * Stop NMR; enter new threshold (in Volts) and click “Set”; start NMR. | ||
| + | * In general, a threshold 0.15 mV is good for normal NMR signals, whereas 0.10 mV may be necessary if the signals are too weak. | ||
| + | |||
| + | 2. Initial field where NMR starts scanning is far away from actual value (this has only been seen with Spectrograph) | ||
| + | * Check what field is NMR scanning and compare with field read by neighboring NMR. | ||
| + | * If it is too far, stop NMR; enter field (in T) and click “Set”; start NMR. | ||
| - | ==== Spectrograph NMR GUI " | ||
| - | * This is typically the case when the thresholds in the NMR GUI are not set properly. If they are too low, the program may lock in noise. Conversely, if the thresholds are too high, it may miss a weak resonance. | ||
| - | * Threshold for the Spectrograph resonance can be adjusted by hand in the Spectrograph NMR GUI. In general, a threshold 0.15 mV is good for normal NMR signals, whereas 0.10 mV may be necessary if the signal are too weak. | ||
nmr_probes.1686335288.txt.gz · Last modified: 2023/06/09 14:28 by swartzj
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