METALJET D2+ OPERATION
Revision 19, November 2016 Page 5-7
Figure 5-4. The “States” tab from which regular operation of the MetalJet D2+ source is carried out through
state requests from this tab.
On. In this state, the system generates x-rays at the requested power, while the liquid-metal jet is
running and the system maintains a good vacuum. This is the standard state of operation.
Recalibrate. Due to the dynamic properties of the cathode, the system must be recalibrated regularly.
This is done automatically when entering the “On” state, but can also be done explicitly by using this
state. The system will return to the “On” state after recalibration.
Stop. In this state, the vacuum pumps, liquid-metal jet, and x-ray generator are all turned off.
Vent. As in the “Stop” state, the vacuum pumps, liquid-metal jet, and x-ray generator are turned off.
In addition, in the “Vent” state, the vacuum venting valve is opened, effectively bringing the system to
atmospheric pressure.
5.5.2 Advanced states
In addition, the following advanced states can be selected by the user:
Cathodebake. Heats the cathode without enabling high voltage. The purpose is to remove oxides from
the cathode surface before normal operation in order to ensure smoothest possible startup. This
routine is automatically performed before going to “lowpower” if the system has been vented.
Heatertune. When a new cathode is installed, this state should be run to automatically create a look-
up table with cathode heater currents and the corresponding electron-beam emission current. That
table is a necessary reference for the electron-beam emission current regulation loop in order to
generate a stable output from the electron gun.
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