This morning I measured the sensing matrix for the ALS X WFS, using the oplevs:

The result for Yaw looks good:

1177countsWFSA YAW/urad ETMX yaw (61 degrees)

565counts WFS B Yaw/urad ETMX yaw (55 degrees)

-815counts WFS A YAW/urad ITMX yaw

533 counts WFS B yaw/urad ITMX yaw (39 degrees)

For pitch the two sensors are nearly degenerate:

-268 counts WFS A PIT /urad ETMX PIT

-999.6 counts WFS B PIT/urad ETMX PIT

201 counts WFS A PIT/ urad ITMX PIT

898 counts WFS B pit/urad ITMX PIT

Based on these matrixes, we would be able to close two DOFs in YAW and one pitch DOF.  We know that the beam profile is really bad in PIT on WFS B (attachment to alog 10774), so we might want to try fixing this before we try lcking the second pit DOF with high bandwidth anyway. There is also cross coupling from PIT to Yaw, which might become a problem. 

The measurements are saved in home/sheila.dwyer/ALS/HIFOX/WFS/

WFS_sensing_matrix_ETMX_PIT.xml ect.  All measurements were made by sending a fither to PUM at 1.5Hz.