This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
turning_magnets_on_off [2014/12/05 20:01] pereira [Turn on S800 magnets power supply] |
turning_magnets_on_off [2019/05/15 11:58] (current) pereira |
||
---|---|---|---|
Line 13: | Line 13: | ||
=== 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 dipole magnet is ready to be turned on when the front panel of the dump switch box shows the red label " |
+ | In case the dump switches need to be open, make sure that the power supplies are turned off. Then, rotate the small trip handle to the " | ||
Line 28: | Line 29: | ||
===== Turn on S800 magnets power supply ===== | ===== Turn on S800 magnets power supply ===== | ||
+ | * **Troubleshooting**: | ||
+ | |||
+ | {{: | ||
+ | |||
* Open the NCS PanelMate application and load file **THallps.ui**, | * Open the NCS PanelMate application and load file **THallps.ui**, | ||
Line 35: | Line 40: | ||
* Go to page 7 and select the steering magnets: **I170DH, I197DH, I231DH**. Note that some of the power supplies are connected to more than one steering magnet. If necessary, disable the steering magnet of the other line and enable the correct one. | * Go to page 7 and select the steering magnets: **I170DH, I197DH, I231DH**. Note that some of the power supplies are connected to more than one steering magnet. If necessary, disable the steering magnet of the other line and enable the correct one. | ||
+ | {{: | ||
- | * The magnet currents corresponding to a given setting are typically set using [[Turning magnets on/off#set S800 magnet setting|Barney]]. However, it is also possible to set them individually for an specific magnet, as explained [[Turning magnets on/off#set S800 magnet | + | * The magnet currents corresponding to a given setting are typically set using [[Turning magnets on/off#set S800 magnets settings|Barney]]. However, it is also possible to set them individually for an specific magnet, as explained [[Turning magnets on/off#Set magnet |
- | |||
- | {{: | ||
- | |||
- | * **Troubleshooting**: | ||
- | |||
- | {{: | ||
===== Set S800 magnets settings ===== | ===== Set S800 magnets settings ===== | ||
- | |||
- | * (**NOTE:** The values of currents for the different magnets can be modified individually by clicking the button " | ||
* Open **Barney** | * Open **Barney** | ||
Line 64: | Line 62: | ||
* 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# | ||
- | | + | |
+ | ===== Set magnet currents individually ===== | ||
+ | The values of currents for the different magnets can be modified individually by clicking the button " | ||
+ | |||
+ | | ||
+ | {{: | ||
===== 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) | ||
- | * The values of the current in each of the two trim coils correspond to about 53% of the currents in the corresponding Spectrograph dipoles | + | * The values of the current in each of the two trim coils correspond to about 43.5% of the currents in the corresponding Spectrograph dipoles |
* Open the NCS application **QTChan** | * Open the NCS application **QTChan** |