zen_api/em/hardware/v1/beam_state.proto#
Version: 2026.5.1
Package: zen_api.em.hardware.v1
Enum BeamState#
Possible beam operating states.
| Name | Number | Description |
|---|---|---|
BEAM_STATE_UNSPECIFIED |
0 | Default enum value. |
BEAM_STATE_UNKNOWN |
1 | Unknown indicates that this variable hasn't been assigned yet. This value should never occur. If you read this value, it's a bug. |
BEAM_STATE_ERROR |
2 | There is an error with the Gun or EHT and the beam cannot be used. |
BEAM_STATE_OFF |
3 | EHT is off. On FE-SEMs, the gun may be on, gun interfaces must be checked to discover gun state. On C-SEMs the EHT and gun are off, and there is no current on the filament. |
BEAM_STATE_TURNING_ON |
4 | The EHT (and gun for C-SEM) is turning on. |
BEAM_STATE_ON |
5 | Gun is on. Filament (if it exists) has full current. EHT is on. The beam can be used. |
BEAM_STATE_GOING_TO_STANDBY |
6 | The beam is going into the standby state. |
BEAM_STATE_STANDBY |
7 | Not all devices support this mode. This represents an intermediate state. The EVO and the FIB have standby states. |
BEAM_STATE_TURNING_OFF |
8 | The EHT is ramping down. On C-SEM, the gun and filament may also be shutting down. |