Yano, Miyakawa

We put a mirror in IFI chamber to pick up the reflection of input beam to IFI. The mirror is put on the small stage that can attach to a poles of the IMMT2 frame.

We prepared two kinds of mount for the mirror. Original one was a bit too large and it interfered with an existing pole on the table. We replaced original one to smaller one and it fitted the hight of incoming beam. Instead of that, a beam dump which we prepared as two plates type was not fitting, so we will use another beme dump as one plate type on the other day.

Currently the pick off beam is hitting on a plate attached to the target frange. Actual beam position is almost middle in horizontal direction, and 1-2cm upper in vertical direction with shims by 6 layers of aluminium foils. We did not want to use too thick shim, and 1-2cm might be acceptable to get the beam out through a view port. 

After the installation, according to Ushiba-kun, beam position on IMMT1 QPD seemed to be shifted in yaw direction. Position of cover between MC out and IFI chamber could be bad and it may block something. Yano-san will check it in the afternoon. If still something wrong, we should check the position of mirror or remove mirror again.