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There looks some activity at around MC2 on Wednesday afternoon.
It caused the misalignment of MC2. Misalignment was not found in MC1/3.
It seems that the incident beam on the MC was aligned in the evening.
This increased the MC transmission but it is vibible that the spot on MC2 is shifted from the center.
We need an action on this issue tomorrow in the daytime.
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I am working on fixing this. You might some strange stuff going on in the control room screens. Pls ignore it till I am done.
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While chatting with Jenne I learnt that some substantial amount of work had taken place yesterday around the MC2 chamber. This was associated with the relocating of seismometers. ref elog.
I reiterate what is well known for quite sometime: MC2 table is not well isolated from the ground. And we should not approach this chamber unless absolutely necessary. I have blocked off the area around it which we should avoid. It is a serious waste of time and effort to realign the MC each time the MC2 table decides to settle into a new position.
Steve tells me that the mild-steel frame supporting the chamber+MC2_table sits with two legs on one concrete slab while the other two legs sit on another one. The frame is also quite weak without sufficient gussets or cross connects. The next time we have a major shutdown we must replace this frame with a more sturdy one which sits on one slab (preferably the one on which the rest of the MC sits).
Till we improve this mounting, I suggest that we avoid that area as much as possible.
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