K. Tanaka, Akutsu

Continued the WAB finalize at IXC; still not finished yet...

Burndy connector

We found the face of each burndy connector in IXC was different from that in IYC; it is mirrored. Rather, I guess the correct pin arrangement is IXC's one.

Let's start with looking at a drawing of a burndy connector here (by Hasegawa-kun), which shows the face-on view of the pin arrangement in IYC at that time. There are two empty seats "blank"; the center and the right-top. On the other hand, the blank pins in the IXC's were at the center and the left-top! Then we checked electrical connection of pin-to-pin between the inside and the outside of the chamber. Fortunately there was a cable to the corresponding connector on the chamber, so we dragged the other side of the cable and looked at the connector face, where we found the indication of the pin assignment like A, B, C... so we determined to rely on these indications; in other words, we assumed that they should be right naming of the pins. Then we confirmed the above.

The pins on the cable connector are female, while those on the inside of the chamber are male. I think the female connector should be mirrored against the male connector. According to my thought, the natural arrangement is that of in IXC, and IYC's would be mirrored...

Anyway, we occupied A-H pins (8 pins) on burndy-P23 in IXC for the WAB thermometers (Fig 12). The connector itslef was moved to the KOACH side.

Easy heat link

To make heat contact between the top plate and the lower structure, an easy heat link should be required. In the cooling test, this worked very well; the upper and lower's temperature differed only 1K (by non-calibrated-rank thermometers... this is within error??). We connected one side of the heat link to the M3 hole on the top (Fig 3), but unfortunately the lower screw hole was inaccessible when the protectors were there, so we gave up the lower today.

Thermometer(s)

I prepared a small extension tag for a thermometer. The tag has an M3 hole and a through hole for M5. The thermometer was attached with the M3 screw to the tag (Fig 4), then the tag was attached to the flange of the WAB (Fig 5). This thermometer will monitor the WAB's temperature. The 4 pins were brought to and connected to the burndy connector discussed above.

The other thermometer should be attached to the structure body, but unfortunately the hole was inaccessible with the protectors, so I gave up. Anyway the 4 pins were also brought to and connected to the burndy connector discussed above (Fig 11).

Soft heat links and the anchor block

Yesterday (see here), I connected one side of each of four soft heat links to the WAB's flange. As shown in Fig 6 and 7, today I connect the other sides to an anchor block with M5 screws, the spring washers, the flat washers, and the M5 nuts (the structure was complicated here; the nest one would become simpler, hopefully ). Then the anchor block was attached to the cooler head with four M8 screws, the spring washers, and the flat washers (Fig 8 and 9). Accroding to Obuchi-san's suggestion, I finilized the screws by torque wrenches; 5 Nm for M5 screws, and 15 Nm for M8 screws (5->10->15). Let's see how it will be cooled down.

Increase the number of the clamps

Finally we increased the number of clamps for the WAB suspension base plate. In total, 5(side)-7(front)-5(side) clamps were used (Fig 10). It's like a Haiku.

To do before Sept 25

• Detach the protectors for the WAB after the HL-VIS finished.
• Connect the other side of the easy heat link to the structure body of the WAB suspension.
• Attach a thermometer to the structure body of the WAB suspension.
• Attach a heat link between the structure and the breadboard somehow.
• Re-toruqe the screws (?), in case there would be some relaxation effects for the screws.