By Kate Metropolis
Bob Hettel, Head of Accelerator Systems Department (SSRLís) and Deputy
Director of SPEAR3 project:
by Nicolle Rager)
"The project started off as a very modest upgrade to SPEAR2, based on
an idea from Helmut Wiedemann and an initial low emittance lattice design
created by one of his graduate students more than a decade ago. It was
most gratifying to receive funding jointly from DOE and NIH, administered
by the DOE. Thanks to a ground-breaking collaboration between those two
agencies, we were able to build a much better machine.
"We are proud of a number of new technical developments that made the
project more than just building another light source. These innovations
were done largely in collaboration with other SLAC groups in areas
including vacuum, magnets and supports, power supplies, rf, and
instrumentation and controls and alignment.
"Two very challenging aspects of the project were one, SPEAR3 had to
fit into the SPEAR2 footprint, which imposed many constraints in component
and lattice design; and two, SPEAR3
had to be installed in a very short time frame (about seven months), a
task that most outsiders (and some insiders) viewed with quite some
"The rapid success of commissioning, where we were able to accumulate
beam in a few days, is a real testimony to the whole SPEAR3 project staff
and to the accelerator physics and engineering groups in collaboration
with the ALS accelerator group. I think more has been learned about the
SPEAR3 optics in the last couple of weeks than was learned in years of
working on SPEAR2."
Richard M. Boyce, SPEAR3 Project Engineer for mechanical systems and
manager of the eight-month long installation:
"This has been a very, very enjoyable experience. The dedication of the
SSRL and SLAC staff is extraordinary. I never hesitate to ask a question,
because there are so many people around who can assist me. They are very
knowledgeable, talented people. You just give them the authority and a little
bit of direction, and they can do anything."
Tom Elioff, Project Director for SPEAR3 design and construction:
"There were three main elements that made the project a success.
"First, SPEAR3 had a top-notch staff overall. We had the best group
leaders for the various technical systems within the Laboratory from both
SSRL and SLAC. On the SLAC side, the experience of the recent PEP-II
project with some similar technical systems was extremely beneficial,
while SSRL provided the knowledge and experience for design and the
requirements for overall operational needs.
"Outside collaborations, especially the one with the Institute for High
Energy Physics in Beijing (IHEP) where all the magnets were constructed,
"Second, the group leaders provided very good technical and schedule
"Third, we were lucky to get our funding requirements on time and
appreciate the support of both NIH and DOE (perhaps a first joint funding
effort for such a project). There was a good and beneficial relationship
with DOE throughout the project."
"SPEAR3 is the newest of the third-generation synchrotron radiation
facilities. Itís remarkable that the same infrastructure that housed the
first multi-GeV synchrotron ever used now houses one of the top rings in
the world. Even more remarkable, electrons are already stored at SPEAR3
after a shutdown of less than nine months.
"What does SPEAR3 mean?
"For users, in all different fields, it means they can collect data
about 50 times faster than before, or tackle projects about 50 times more
difficult. If it takes you one week to collect data for an experiment, it
may not be practical to do that experiment. But if you can get your data
in just three hours, then that can change things.
"SPEAR3 also means that we can develop new techniques for using
synchrotron light, so that whole classes of experiments that havenít been
done here before can now be conducted. The new techniques include
microbeam probes, so. x-ray emission, and advanced spectroscopy with high