On the first try Corey and I found that the height of the beam dump is too high. The bottom of the black glass is about the same height as the center of ZM2, which is about 8.125" (first attachment, the beam dump was placed right next to ZM2 so it's easy to see the height).
This turned out to be some mixup of which variety of d1400171 should be used. What we received are (yet to be captured in DCC but) two 4" posts, giving us 8" at the bottom of the V-dump holder, and 1/8" is added by the V-dump holder itself.
We talked to Stephen, Betsy and Calum, and we decided to go with Corey's suggestion to stack up 5 pieces of V-dump holder D1000972 as a 2.5" spacer (so we use total of 6 V-damp holder). Together with 4" post, the top of V-damp holder becomes 7" high, and the black glass sticks out by about 2". It's 1/8" lower than ideal but that's not a big deal (2nd attachment, again the beam dump is misplaced intentionally).
Corey and Sheila looked at ZM2 and the new beam dump from behind OFI to check that the eddy current damper bracket and the cage are occulted by the black glass while the entire 2" optic is visible. We also made sure that the beam dump won't block the main beam path between ZM2 and the septum window.
More pictures will be posted by Corey and/or Sheila.
Additional notes for this install (with a MacGyver-ed Beam Dump Assy [vs. the planned D1700347-assy]):
- We did NOT have to move any SEI Table Masses (there was plenty of room in front of ZM2 for Keita to place it in front of ZM2). Hugh/Jim will still need to check balance of the HAM5 ISI due to the added weight of this beam dump (and possible OFI baffle change) later this week.
- Luckily found a Class-A 3" Ag-plated 1/4-20 SHCScrew to sandwich the all (6) Beam Dump V-Holders.
- Will attempt to ICS what was installed next.
Attached Photos:
- Overall cool shot of Keita with Sheila adding nice light.
- BEFORE line-of-sight: OFI mirror (focused) --> ZM2.
- BEFORE line-of-sight: OFI mirror --> ZM2 (focused).
- BEFORE location of where dump will be placed in front of ZM2 (no SEI masses will have to be moved!).
- BEFORE Beam Dump Assy with errant 8" of 1"-diameter posts (Keita also has photo of this in his entry).
- AFTER line-of-sight: OFI mirror (focused) --> ZM2.
- AFTER line-of-sight: OFI mirror --> ZM2 (focused).
- Wide angle of Keita after install.
- Work-around Beam Dump Assy & Keita.
- Portrait of Keita after install.
- AFTER TOP VIEW of the beam dump assy.
