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turning_magnets_on_off [2015/10/19 13:45] pereira [Set magnet currents individually] |
turning_magnets_on_off [2017/04/11 20:07] pereira |
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=== Purpose === | === Purpose === | ||
- | The power supply for each of the spectrograph dipoles has a dump switch that must be armed to send current through the dipoles. The dump switch is in place to protect the conductors inside the cryostat from melting in the event that the magnet becomes non-superconducting while energized with high current. When triggered, the dump switch provides a high-current short circuit path to dump the energy from the magnet. The kinds of error conditions that will trigger the dump switches are the same conditions that trip off power supplies to other superconducting magnets on the beamlines. | + | The power supply for each of the spectrograph dipoles has a dump switch that must be armed (closed) |
- | While designed to protect the magnet from a more expensive repair if the magnet quenches when energized, it is possible that the dump switch can get damaged if triggered because of the large amount of energy involved. | + | While designed to protect the magnet from a more expensive repair, if the magnet quenches when energized, it is possible that the dump switch can get damaged if triggered because of the large amount of energy involved. |
=== Operation === | === Operation === | ||
- | The dump switches of the first and second dipoles are located on the bottom and middle level of S3. The two pictures below show the dump-switch control for the second spectrograph dipole. A label in the control box explains how to arm the switches. | + | The dump switches of the first and second dipoles are located on the bottom and middle level of S3. The two pictures below show the dump-switch control for the second spectrograph dipole. A label in the control box explains how to arm the switches. The dipole magnet is ready to be turned on when the front panel of the dump switch box shows the red label " |
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===== Turn on S800 magnets power supply ===== | ===== Turn on S800 magnets power supply ===== | ||
+ | * **Troubleshooting**: | ||
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+ | {{: | ||
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* Open the NCS PanelMate application and load file **THallps.ui**, | * Open the NCS PanelMate application and load file **THallps.ui**, | ||
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- | * **Troubleshooting**: | ||
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- | {{: | ||
===== Set S800 magnets settings ===== | ===== Set S800 magnets settings ===== | ||
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* Ensure that the current in the dipoles are properly matched to the desired values (see section on [[NMR probes# | * Ensure that the current in the dipoles are properly matched to the desired values (see section on [[NMR probes# | ||
+ | |||
+ | * Note: The currents in the Trim coils will be set automatically in Barney, once the rigidity in Segment 8 was entered. | ||
===== Set magnet currents individually ===== | ===== Set magnet currents individually ===== | ||
- | **NOTE: | + | The values of currents for the different magnets can be modified individually by clicking the button " |
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+ | {{: | ||
===== Turn on the trim coils of the Spectrograph dipoles ===== | ===== Turn on the trim coils of the Spectrograph dipoles ===== | ||
+ | Note: The following procedure describes how to set the trim-coil currents manually. In principle, it is no longer necessary because Barney sets the currents automatically once the rigidity of segment 8 has been entered. | ||
+ | |||
* Check the currents in the Spectrograph dipoles by looking at the EPICS channels I265DS and I269DS. This can be done e.g. by clicking the button **Details** in segment 8 of the S800 Barney page (see figure below) | * Check the currents in the Spectrograph dipoles by looking at the EPICS channels I265DS and I269DS. This can be done e.g. by clicking the button **Details** in segment 8 of the S800 Barney page (see figure below) |