(See also 3245)
= Question =
Shall we do an iterative process that we repeat measuring the transverse mode after IMMT2 and moving the position of IMMT1 and/or IMMT2???

= My Answer =
No. It would not be very benefitial.

1st plot: Comparison between designed transverse mode propagation and that expected from measured RoC of IMMTs
2nd plot: Mode matching ratio to PRC vs the position of IMMT2

The second plot indicates:
If we want to gain less than 1% MMR, we have to move one of IMMT as much as 5cm.
I think it would not be a good idea to move IMMTs more than ~ cm, since this might require additional design change of oplevs, IMMT1/2 trans table, and so on.

If we have time, we are going to check the beam profile to see if something is completely wrong or not, though.