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Reports until 16:37, Tuesday 10 February 2026
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gerardo.moreno@LIGO.ORG - posted 16:37, Tuesday 10 February 2026 - last comment - 17:05, Tuesday 10 February 2026(89107)
HAM7 Viewport Inspection

(Jordan V., Travis S., Betsy W., Richard M., Gerardo M.)

We inspected all the viewports currently installed on HAM7, inspection was done to verify the serial number on the viewports or viewport assembly.
Most viewports passed visual inspection, however we did note that one viewport assembly on port A2F3 has some blemishes, they are located on the glass of the assembly on both, air and vacuum side.  We asked others for a second opinion, we decided to leave current viewport assembly in place and replace it on the next vent.  This particular viewport was inspected "recently" by others, see aLOG entry.

-Y door viewports:
Port A1F2 a ZV-800 serial number R144, nothing noted.
Port A1F1 a ZV-800 serial number R134, nothing noted.

+Y door viewports;
Port A2F1 has a ZV-800 serial number R146, nothing noted.
Port A2F2 has a ZV-800 serial number R109, nothing noted.  Side note, this viewport has a AR1064 coating.
Port A2F3 has a D1100999, high quality  non-wedged 6" viewport.  Serial number 011.  Some blemishes on the air side of the glass, located around 12 O'clock.  Blemishes vacuum side of the glass, located around 2:30 to 3:30 O'clock.
Port A2F4 has a D1100999, high quality  non-wedged 6" viewport.  Serial number 022, nothing noted.

 

Comments related to this report
jordan.vanosky@LIGO.ORG - 17:05, Tuesday 10 February 2026 (89111)

Pictures of the coating blemishes. 

Viewports installed on HAM7 (PN, SN, and inspection notes) are recorded in spreadsheet on E2400096. This spreadsheet only includes the viewports installed for the A+ filter cavity line (HAM& & HAM8). Future in situ viewport inspections will be recorded here as well.

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