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AOS (Baffles & Beam dumps)
tomotada.akutsu - 16:08 Monday 30 May 2022 (20939) Print this report
Invac high-power beam dump setting: Day 1

Yano, N. Sato, Akutsu

Summary

Brought the invac high-power beam dump (Fig. 1) in front of the IMMT2 in the IFI chamber; not yet connected the heat links; not yet clamped. We understood that we may need to do additional works such as installing some beam dumps for IMMT2 before closing the K400 flange located in the +Y direction of the IFI chamber.

Details

After installing the IMMT2 shield and recovered the alignmet of IMMT2 (20938), we firstly installed an additional invac cable into the IFI chamber (Fig. 2). The other one had been there from the very past for the past highpower beam dump. So, as a result, there are two invac cables for the thermometers for the high-power beam dump.

Then we brought the part assembly of the high-power beam dump. The nominal position was marked with two white tapes (Fig. 3) tentatively by referring the design drawing and it was broght there (Figs. 4 and 5); the precise relocation has to be done later referring to the IR light beam reflected by PRM.

In our observation, before closing the flange in the +Y direction of the IFI chamber to connect the heat link to this flange, we may need to do further work, otherwise it would be very difficult to access a certain area in the IFI chamber, so we stopped today's work to check the remaining work list.

Note

As of 20938, after locating this heavy body of the high-power beam dump, the IMMT2 oplev and PR2 trans QPD moved in pitch again, but not such drastic this time. Let's see... Observing 1 hour trend so far, it has trend again. The work place has been covered by the aluminum foil tube, so this trend might be due to the change of the temperature?

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