|Summer 2011 Shutdown Update|
|Wednesday, 22 June 2011 15:07|
The 2011 ALS summer shutdown is turning out to be quite productive. Read updates of shutdown activities and see pictures here. This page will be updated, so check back regularly!
THE DOME of the Building 6 roof is in need of repair both inside and out
The exterior of the roof is nearly re-shingled! See the newest images here, taken from atop the dome!
Construction crews built scaffolding around the outside of the dome's roof so they could access the whole dome safely.
Asphalt shingles that used to leak during heavy rains will be replaced with "cool roof" technology.
The dome is half done in this photograph. You can clearly see the old (bottom) and new (top) shingles!
Construction crews have been hard at work all month reroofing the ALS dome! What a gorgeous view they get from the office!
It's nearly complete. The ALS's new "cool roof" will be complete soon!
No update on the dome's interior. The plastic sheeting is still in place. Stay tuned to see the final result...
Scaffolding was built on top of the large crane in the ALS building. Workers will be scraping lead paint away from 30% of the dome's interior. A "lead lock" coating will then be applied to protect occupants from exposure to the remaining lead paint.
A plastic sheet now hangs between the interior of the dome roof and the delicate controls below. This will prevent stray pieces of hardware or lead paint chips from falling.
Super Bend Magnets get new cold heads - every year
This is one of the ALS's three super bend magnets (super conducting center bend in SR 4, 8, and 12). The cold heads (helium compressors) on the magnets must be swapped out every year. This involves warming the magnets up from their sub five kelvin operating temperature, breaking the vacuum, swapping the cold head, reestablishing the vacuum and cooling the magnet back down. This process takes a minimum of three weeks and is one of the things that drives our need for an annual extended shutdown.
Sector 6 gets ready for a new Elliptically Polarizing Undulator
This EPU has been undergoing magnetic testing in the building 15 high bay for several months. It's final location is expected to be in sector 6.
This new vacuum chamber was installed during the shutdown, as well as a new chicane magnet. These preparations have prepared this downstream section of straight 6 for the new EPU, which will be installed over several 2-day shutdowns in the coming months.
POWER SUPPLIES are also being replaced during this shutdown. An old QFA and an old SD power supply were both removed in preparation for newer models.
Crews remove the old sextupole power supply using a counter weight and a 4-ton crane. Two new sextupole power supplies will replace this old one, providing a tested backup should it ever be needed.
The old QFA power supply was also removed in preparation of a new one. The new QFA will be less sensitive to line voltage sags that cause beam dumps. Both power supply upgrade projects will aid in more reliable beam delivery, but are mainly to replace aging equipment and keep the ALS running smoothly.