[Takahashi, Ikeda]

We tested the ribbon heaters in the cross tube and top chamber.

1. Winded two ribbon heaters at the bottom of corrugate tube.
2. Covered the heaters with Al foil.
3. Put the temperature controller on the cross tube.
4. Laid the cable for the BF RTD from the flange on the top chamber to the cross tube along the corrugate tube.
5. The temparature in the heaters could be controlled at 23.5 deg (+2 deg). The temperature in the BF was not changed.
6. Heated up the cross tube upon  84 deg. The temperature in the BF was changed only 0.1 deg. LVDTs in the F3 and BF showed drift of 20~90um (plot).
7. Moved the heaters to the top chamber.