I replaced the razor blade beam dump that was being used to dump the p-pol beam (rejected beam in the MCR path) with two steering mirrors and a Kentek Trap-it.

The p-pol beam will be a minimum of 1.2W at 50W input power, and about 0.8W at 30W input power.

Removed: IO_MCR_BD6 razor blade dump

Added: steering mirrors IO_MCR_M14 and IO_MCR_M15:

• Newport: 10QM20HM.10
• 1/10 wave
• 0deg
• R(s-pol) > 99.7%
• R(p-pol) > 99%

Added: IO_MCR_BD6 high-power beam dump

• Kentek Trap-it beam dump
• model: ABD-3/4 inch aperture
• max. power 50W

With this upgrade completed, I've modified the IOT2L layout drawing to include the new components, and updated the version to D1300357-v3.

Attached: 

• new components - view from the front of the table
• new components - top view