Opening a Window of Discovery on the Dynamic Universe

M2 Substrate Relocation

LSST E-News : 
December 2014

The LSST secondary mirror (M2) substrate has been safely relocated from Harvard University in Cambridge, MA to the Exelis facility in Rochester, NY. The mirror’s trek, which involved the use of a 50-ton internal bridge crane to load the mirror transport box onto a wide-load flatbed truck and a 70-ton external crane to offload it at destination, covered 604 miles in a little over a day. The truck and pilot vehicle departed Harvard at 1 pm on October 20 and arrived in Rochester at 3 pm on October 21. Subsequently, Exelis personnel have disassembled the transport box and thoroughly inspected the substrate.

LSST Head of Safety Chuck Gessner observed the loading of the M2 transport box from Harvard Physics Lab storage onto the truck. LSST Telescope and Site Subsystem Manager Bill Gressler observed the mirror’s offloading at Exelis’ receiving area. Accelerometers were used to monitor and record acceleration, temperature, and movement forces on the mirror during its road trip. Neither the active nor the passive accelerometers indicated any problems during transport.

Delivery of the M2 substrate to Exelis highlighted the kick-off of the M2 Cell Assembly Fabrication effort. Exelis has been awarded the contract to process the M2 substrate to a finished polished state and also to provide final design, fabrication, assembly, test, and delivery of the M2 Cell Assembly. The M2 assembly will ultimately be integrated onto the telescope on Cerro Pachón in Chile. The 3.4-meter diameter mirror is a solid meniscus design fabricated from ultra low expansion (ULE™) glass manufactured by Corning Incorporated, Corning, NY.

View a gallery of images of the M2 relocation. 

LSST Telescope and Site Project Manager William Gressler and Exelis personnel pose with the LSST secondary mirror (M2) substrate in the vendor's receiving area.
Image Credit: 
LSST

LSST E-News Team

 

Suzanne Jacoby (Editor-in-Chief)
Robert McKercher (Staff Writer)
Mark Newhouse (Design & Production: Web)

Emily Acosta (Design & Production: PDF/Print)
Additional contributors as noted

 

LSST E-News is a free email publication of the Large Synoptic Survey Telescope Project. It is for informational purposes only, and the information is subject to change without notice. 
Copyright © 2015 LSST Project Office, Tucson, AZ

 

  

Financial support for LSST comes from the National Science Foundation (NSF) through Cooperative Agreement No. 1258333, the Department of Energy (DOE) Office of Science under Contract No. DE-AC02-76SF00515, and private funding raised by the LSST Corporation. The NSF-funded LSST Project Office for construction was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA).  The DOE-funded effort to build the LSST camera is managed by the SLAC National Accelerator Laboratory (SLAC). 


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