Madi, Camilla, TJ 

• Had a look with the card at both the HWS beam and the ALS back reflection in the HWS line
  • Both 50um and 200um fibre attached
• Took power-meter measurements
• For 50um fibre, only ~20uW out of the collimator, and lower than ambient light coming back to HWS camera
• For 200um fibre, 247uW out of collimator
• 14.45uW of ALS at HWS camera
• 78.6nW of HWS at HWS camera
• 49.3nW measured with no beam on HWS camera
• Also misaligned ETM, and watched the ALS beam, and the HWS beam move off the HWS camera, confirming that what we were seeing was indeed returned light from the ETM
• With the HWS beam, there was an artefact that didn't move with the ETM misalignment - theorise this is a stray beam reflection from optics on the table onto the HWS camera
• The return ALS beam is very strangely shaped - before labelled the 'mickey mouse ears'. To me it looked like a 1,0 mode, but with one lobe larger than the other. Interested to see how much similar the HWS return is to that shape?
• Checked HWS alignment towards ETM - pretty bad, not very centred. Off in pitch and yaw
• Checked co-alignment of HWS and ALS towards HWS camera - not great