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nmr_probes [2013/12/14 17:51] pereira [Operation] |
nmr_probes [2014/11/13 12:30] pereira [Operation] |
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Due to the location of the NMR probes in the dipoles of both the S800 analysis line and spectrograph, | Due to the location of the NMR probes in the dipoles of both the S800 analysis line and spectrograph, | ||
- | The solution | + | The solution implemented on the S800 uses digital oscilloscopes to digitize the NMR signal. The digitized signal is then used in a program that calculates the position of the resonance and deduces the value of the magnetic field. This program (written in Tcl/Tk) is fully autonomous and automatically writes the measured Brho values to the relevant EPICS channels. In addition, it offers the possibility to match the dipoles by pairs and keeps a log file of the measured fields. |
===== Description ===== | ===== Description ===== | ||
- | The NMR running programs for both the S800 analysis line and spectrograph dipoles can be started by selecting the NMR option in the operation applications of the desktop **devop1**. The picture below shows the NMR panel for the S800 Analysis Line GUI as an example. The top (yellow) panel shows the data relevant to the NMR module, the middle (pink) the digitized signal from the oscilloscope and the bottom (blue) the status and measurements for the dipoles. | + | The NMR running programs for both the S800 analysis line and spectrograph dipoles can be started by selecting the NMR option in the operation applications of the desktop **u6pc5**. The picture below shows the NMR panel for the S800 Analysis Line GUI as an example. The top (yellow) panel shows the data relevant to the NMR module, the middle (pink) the digitized signal from the oscilloscope and the bottom (blue) the status and measurements for the dipoles. |
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- | If a dipole is turned off or its field is being changed, the status shows either " | + | If a dipole is turned off or its field is being changed, the status shows either " |
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In case nothing happens after clicking on the icon, the connection to the NMR module is probably locked and needs to be freed. To free it, type the following from any shell window (actual typing show in this font ): | In case nothing happens after clicking on the icon, the connection to the NMR module is probably locked and needs to be freed. To free it, type the following from any shell window (actual typing show in this font ): | ||
- | - **telnet 35.8.35.139** | + | - **telnet 35.9.56.212** |
- | - enter any **username** | + | - Enter any **username** |
- | - **su ** | + | - **set priv ** |
- | - **system** | + | - The system |
- **unattach port x** (where x=1 for the analysis line and x=2 for the spectrograph) | - **unattach port x** (where x=1 for the analysis line and x=2 for the spectrograph) | ||
- **logout** | - **logout** | ||
- Click again on the starting icon and the program should start. | - Click again on the starting icon and the program should start. | ||