June 2002, trip report for SK rebuilding (from BU crew of Ed, Jim, & Chris).
|An example of the new PMT covering: fiberglas shell in back, clear acrylic dome in front. Apparently there was a mishap where in the molding process, a residue of material not transparent to UV was left on the acrylic. Some number of domes have to be remade.
|Our Japanese colleagues working on the inner PMT preparation assembly line.
|Students at work on top outer detector tubes and Tyvek.
We needed new pipes for attaching the Tyvek. Finding a vendor was an adventure starting at a local home store, going to a commercial supplier (who did indeed deliver these to the mine entrance), and even after the mission was accomplished, we ended up 'discovering' the holy grail of hardware stores- comparable to Tsukuba's famous Joyful Honda.
|The ropes were a little too loose and the driving was a little to fast.
|Mission #2 to the hatrdware store (Musashi) required bringing back three stainless steel pipes each 4 meters long. That's a little too long for our car, but Jim takes a stab at modifying the back seat. (In the end we lashed them to the side).
|Chris and Jim on the floating floor inside the inner detector.
Yes, the ladder down is hanging by ropes.
|Reference shot of the front of an OD PMT.
|Reference shot of the back of an OD PMT.
|We went to Kamioka for dinner and ran into Ohtsubo-san. She sent us to a new (for us) restaurant with an okonomoyaki variant called manjoyaki.
|A lot of the effort revolved around designing a setup to align and hoist 3 panels of 1-meter wide Tyvek (the widest we could procure in Japan).
|At the hardware store, you can also buy pet giant beetles.
|Since the top of the tank is practically inaccessible, we are hanging the new Tyvek starting a few meters down. After much debate on how to accomplish this, we bit the bullet and asked (paid for) Mitsui to weld new brackets.
|Then we extended the old Tyvek, suitably cutoff, and wired it in place. Here is the final installation, ready for new rolls to hang down sometime in September.
|Outside the tunnel, Hank and crew took apart the Radon Hut. It will be replaced with a simpler scheme drawing fresh air from far away from the tunnel entrance (now that the landowner has agreed). Here is Hank in some snappy painting gear.
|Chris wants to know how this dam, seemingly built out of wood planks, can possibly hold up. Well, it is leaking quite a bit...