Main points:

• We are getting a return beam from HWS EY, but it has not been tested with ring heaters or higher arm power.
• Added a 533nm bandpass filter on the camera. While it does not filter out all of the ALS beam, it is now possible to see the HWS beam while ALS is on. (See attachment)
• Thanks to the EE crew I hooked up the new cable to the laser and we can now turn it on and off remotely. (But see alog25770)

Longer winded:

I started the day out with work station issues, this slowed me way down and killed a large chunk of my time. I went to check for a return beam but did not find anything when I streamed the image, but only after I had stopped the code and removed the HWS plate. I then checked the irises and saw that the beam was not passing through most of their centers. I adjusted it so the beam was passing through all of the irises and then found a return beam quickly after. I moved ETMY by 20urads back and fourth, and tried to minimize the movement seen on camera. This didn't work great, but I wasn't getting a ton of motion so I moved on.

I added in the new 533nm bandpass filter to filter out the ALS junk light that makes it through the PBS. This seemed to work well, see attachment. I also hooked up the cable that the EE guys set us up with, so now we can turn the laser on and off remotely. 

We still need to test this with higher power tonight. I'm sure it could use a bit more tweaking, but I ran out of time. 

Attachments:

• 1 - Streamed image without plate
• 2 - Streamed image with the filter installed and ALS unshuttered
• 3 - Streamed image withe filter installed and ALS shuttered
• 4 - HWSEY screen