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AOS (Baffles & Beam dumps)
simon.zeidler - 23:20 Tuesday 23 October 2018 (6680) Print this report
WAB IYC installation

Akutsu, Yano, Tanaka, Simon

Transport to IYC

  • we used the crane in the center area to take the WAB out of the box and put it on a cart
  • Then, we somehow managed to bring the WAB to the +X entrance of the IYC clean-booth and used our hands to bring the WAB inside the clean-booth to put it onto the table
  • We opened the wrapping and re-attached the magnet-dampers (this time, due to the separation we did in Mitaka, the magnets were still in place)
  • After that, we used the usual procedure to bring the WAB inside the chamber:
    • First the upper-part is detached from the base
    • Then, the base is being brought inside the chamber and fixed on the optical table (in the nominal position)
    • Two persons bring the upper-part to the chamber's entrance where it is taken-over by the other two persons (the most difficult part is during the take-over as at the entrance, the space is very limited)
    • At last, the upper-part is re-attached with the base

Height and Pitch Alignment

  • we removed the protectors and placed a laser-level at the entrance-flange of the chamber
  • Then, we took a measurement of the height of the baffle-center in its fixed state for confirmation ( → 270mm)
  • After we released the baffle, we took this measurement again
    • → 269.3mm (that is quite close to the nominal height at room-temperature and as expected)
  • Then, we went further to check also the pitch of the baffle (started on the +X side) and found ~1mm pitch (difference of the laser-level at the two baffle-shipping-lock-brackets). However, to our curiosity, we did not find this pitch on the -X side... While this is maybe not so important for the baffle's purpose, it is a strange thing thinking of stiff baffle and wires (which were all straight and spanned) fixed at 4 different points in a plane...

This is still unresolved! Will continue tomorrow!!

Images attached to this report
Comments to this report:
tomotada.akutsu - 9:04 Wednesday 24 October 2018 (6686) Print this report

none

tomotada.akutsu - 9:10 Wednesday 24 October 2018 (6687) Print this report

Addendum to the Simon's post:

  • As shown in Fig 3, the vertical ruler shows 4mm when the tip is touching to the top of the black bread board, so we need to subtract 4mm from each read shown by the indicators.
  • The numbers to be read are not the red lines on the vertical ruler, but the numbers shown by the indicators, as the one which is pointing the red laser lines is the tip (Fig 4 and 7).
  • Fig 5 shows the "seems-not-to-have-pitching" side (where Simon was standing; minus X). The other side, where Yano-san was standing (plus X side), there seemd pitching (the rear edge of the WAB seemed "slightly" down.)
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