Jennie W

Today after verifying I didn't need to do any alignment on ISIK itself (SPI bench on HAM3), I used the picomotor on HAM2 (M_C1) to align the beam to the QPD B which resides on ISIK.

I have attached a labelled ndscope showing which channels to look at while changing the M_C1 picomotor.

The yaml files for aligning QPDA and B are saved as QPBa_picos.yaml and QPDB_picos.yaml in userapps/spi/h1/ndscope.

One weird thing I noticed while moving the picomotors is that while moving in small steps of 1 count (speed of the picomotor was set to 'jog' which is 50 Hz), the beam would move in the same direction on the QPD while I change direction on the picomotor.

See an example in this image.

Not sure why this happened as it was not a problem when using larger steps of 10 counts on the picomotor.

With steps of 10 counts the beam goes down in pitch on QPDB which corresponds to down on picomotor controls (channel Y down on picomotor controller).

To go up in yaw on QPD B you need to go right on picomotor controls (channel X up in magnitude).

Summary: QPD A and B are fairly well centred when HAM 2 and 3 are isolated now.