I assembled the 45MHz WFS unit in the optics lab. Assembly drawing: D1102002.
BOM:
- 1x Pre-assembled WFS body (D1102004 s/n016 Main Body, sealed & scribed as "S1300637" according to Corey's email)
- 1x Alumina spacer (D1102007)
- 1x Baseplate (D1102003)
- 1x Q3000 QPD
- 1x QPD hood (D1102006)
- 2x SHCS 1/4-20 X .75" 18-8 VENTED for the baseplate
- 2x 1/4" PEEK washer (D1102010) for the baseplate
- 4x SHCS 4-40 X 3/16" 18-8 Vented for the QPD hood (spec is BSHCS but SHCS works fine)
I confirmed that the baseplate and the WFS body are electrically isolated from each other.
There were many black spots on the WFS body (2nd pic) as well as the aluminum foil used for wrapping (3rd pic). It seems that this is a result of rubbing of aluminum against aluminum. I cannot wipe it off but this should be aluminum powder and not some organic material.
QPD orientation is such that the tab on the can is at 1:30 o'clock position seen from the front (4th pic). You cannot tell it from the picture but there's a hole punched to the side of the can.
Clean SMP - dirty SMA cables are in a bag inside the other clean room in the optics lab. DB25 interface cable is being made (or was made?) by Fil.
This WFS Assembly (D1102002) has been given the dcc-generated Serial Number of: S1300637 (with its electronics installed & sealed with 36MHz & 45MHz detection frequencies). As Keita notes, this s/n is etched by hand on the WFS Body "part" (D1102004 s/n016).
Here is ICS information for this new POP WFS with the Assembly Load here: ASSY-D1102002-S1300637
(NOTE: When this WFS is installed in HAM1, we should also move this "ICS WFS Assy Load" into the next Assy Load up: "ISC HAM1 Assembly" (ICS LINK: ASSY-D1000313-H1)
Tested the in-vac POP_X sensor in the optics lab:
- Flashlight test: all 4 segments showed a DC response when a flashlight was pointed to the QPD.
- RF transfer functions from the test input to the individual segments; see attached plot. All traces look as expected.
All electronics tests passed! We are ready for installation.
