diff --git a/config/devices.properties b/config/devices.properties
index 6219e98..33a7ec9 100644
--- a/config/devices.properties
+++ b/config/devices.properties
@@ -9,5 +9,6 @@ field_z=ch.psi.pshell.epics.ChannelDouble|X07MA-PC-PS1:M:GO.A|||
 field_z_done=ch.psi.pshell.epics.ChannelInteger|X07MA-PC-MAG:Z:RAMP:DONE|Read||
 pol_mode=ch.psi.pshell.epics.DiscretePositioner|X07MA-ID:MODE|||
 offset=ch.psi.pshell.epics.ChannelDouble|X07MA-ID:ENERGY-OFFS|||
-pol_done=ch.psi.pshell.epics.DiscretePositioner|X07MA-ID:DONE|Read||
+alpha=ch.psi.pshell.epics.ChannelDouble|X07MA-ID:ALPHA|||
+pol_done=ch.psi.pshell.epics.ChannelString|X07MA-ID:DONE|Read||
 sample=ch.psi.pshell.imaging.MjpegSource|http://x07ma-cam-5/axis-cgi/mjpg/video.cgi||-100|