Figure 3
Time evolution of the temperature of the mirror chamber. The solid and dotted lines represent the temperatures on the side of the mirror surface and on the opposite side, respectively. A small discrepancy of ∼2°C can be seen at 0 s, before and after installing the shield. It is due to the change in the room temperature without a beam at the main hutch containing the first-mirror chamber, which may be affected by air-conditioner settings, seasonal changes, positions of heat sources such as pumps etc. |