Beam shutter

Shutter for the input beam

We tried to install a medium-speed shutter in 2017 to shut the input beam after the IMMTs so that installation work after the PRM can be done without wearing safety glasses.
However, the shutter did not work somehow and the anticipation failed.

We planned to reuse the shutter to shut the beam before the OMC so that the OMC can be protected until the main interferometer is robustly operated in the dark fringe.
We planned to use the same shutter we purchased for the input beam in 2017.

The shutter is a product by Uniblitz. The product name is CS65E1ZM0-ECE. The blade is made of BeCu and coated by AlMgF2. The damage threshold for 1064nm CW is 2.5W/mm2.
If the shutter is used after the IMMT2, the beam radius is 4mm and the max tolerable power will be 125W.
If the shutter is used before the OMC, the beam radius is 0.45mm and the max tolerable power will be 1.5W.
The total opening time is 54msec. The shutter speed is higher than this if the beam is placed near the center of the shutter.
The shutter is vacuum compatible: 1e-8 torr.
The shutter driver is VED24.