Simon, Yano, Akutsu (w/ help of Ushiba): continued from 8205.
Broght the WAB back to the original location close to the cryopayload, and did some additional small works.
- Firstly Ushiba-kun detached some of the heat links between the HL-VIS and the cryopayload to clear the space so that we could setup the WAB traverser there. Then we slightly moved two clamps that are fixing the security frame of the cryopayload onto the breadboard so that the WAB base plate would not interfere against the clamps (ref 7590 and 7596).
- Then detached the flange protectors that were attached at the front edge of the WAB.
- Set up the WAB traverser, and lifted up the WAB suspension, and transported it to the nominal position (Fig 1). We could use the originally planned M6 narrow-cap screws to fix the base plate to the breadboard with a sufficient gap of about 10mm from the cryopayload (Fig 2, 3, and 4); the gap could be estimated from the gap between the WAB base plate and the cryopayload's security frame.
- After dismantling the traverser setup from the cryostat, we attached several parts to the WAB and the suspension and so on as follows.
- Adapter block to the cooler head: an adapter block, which will interface four 6N Al heat links from the WAB and the cooler head, was attached to the cooler head. Four M8-40 screws, the plain washers, and the spring washers will be used, and the final torque of 15Nm (5-> 10-> 15) will be applied to each by a torque wrench, but today we forgot some plain washers so they were partly done.
- 6N Al heat links: four 6N Al heat links were connected to the adapter block and the dual flanges of the WAB. Four M5-10 screws, the plain washers, and the spring washers were used to fix the tags of the heat links to the WAB flanges, and the final torque of 5Nm will be applied to each by a torque wrench (today we did not torque so much). In the same manner, four M5-10 screws, the plain washers, and the spring washers were used to fix the tags of the heat links to the adapter block, and the final torque of 5Nm was applied to each by a torque wrench. When I fixed the tags to the adapter block, the tags tended to rotate during screwing, so we somehow stop them rotating as much as possible.
- Flange tag for a thermomter: a tag for a thermomter for one of the WAB flange was also attached. An M5-10 screw, the plain washer, and the spring washer were used. The troque was 5Nm as well.
- Thermometers: two thermometers (LakeShore DT-670B-CU) were attached to the WAB and the suspension structure (Fig 7); one (S/N#655 in Fig 5, which was called #5 during the WAB cooling test last year) for the WAB, one (S/N#368 in Fig 6, which was called #6 during the WAB cooling test last year) for the suspension structure. For the WABside , an M3-10 screw, the washer, and the spring washer was used, while the structure side an M3-8 was used (Torque wrench was not used.) ... the M3-8 would be replaced with M3-10 later.
- Easy heat link: an easy heat link, which Yano-san assembled at the Mozumi office last night, was attached. Just used o-type tags and two 30cm single electric wires (not strand ones). And then washed it. It was attached to the WAB suspension to connect the upper and the lower part with two M3-8 and M3-5 screws, respectively, the flat washers, and the spring washers. The next time we don't need to used M3-5, as M3-8 would be better at least for the upper part; firstly I used M3-5 for the upper part, but when I torqued it, the screw hole would get broken... so I chenged the M3-5 screws with a M3-8 one and then it was fixed.
Note: we could not insert support blocks under the bottom of the base plate today, and that will be done later. Electric connection of the thermometers will be done later.
