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500 mA news : last update July 19, 2005SPEAR3 2004 Closeout ReportSPEAR3 Commissioning UpdateFirst SPEAR3 Beam
into SSRL Beam Line Hutch
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A major milestone
for the SPEAR3 commissioning occurred at 17:56 on Monday, March
8, 2004, when the first SPEAR3 synchrotron light was observed
on a monitor located inside BL9-3's monochromator housing ![]() Fig. 2 |
![]() Fig. 1 |
A video which chronicles
the installation activities is available at:
http://www-ssrl.slac.stanford.edu/movies/spear3-oct-03.mpg
SSRL entered a new era of synchrotron radiation experimentation with the
completion of the SPEAR 3 upgrade project in 2008. The SPEAR 3 storage
ring, with parameters summarized in Table 1, produces beams having one
to two orders of magnitude higher brightness and flux density than the
old SPEAR 2 ring (Table 2), accommodates several new high performance
insertion devices and beam lines, and is capable of top-off operation
by virtue of its improved at-energy injection system. Brightness for
new undulators exceeds 1018 at 5 keV. The 4-year, 58 M$ upgrade project is administered by the DOE, with ~50% joint
funding from NIH.
The project completely replaced the SPEAR vacuum chamber,
magnets, support rafts, RF, power supplies, cable plant and shielding
tunnel floor in a 7-month shutdown period that began March 31, 2003.
480 tons of SPEAR 2 magnet girders, vacuum chambers, power supplies,
and most cables and controls were removed from the SPEAR site. Shielding,
utilities and other ancillary systems were modified, a new cable plant
was installed in trays outside the tunnel, new power supplies were installed
in a refurbished building, a new concrete floor was poured and mounting
plates for SPEAR 3 magnet and vacuum chamber support girders were installed
and aligned. Pre-assembled girders were installed in the second week
of August, followed by straight section vacuum chamber, mode-damped
RF cavity, insertion device and beam line front end component installation
in September and early October. The vacuum system was pumped down,
cable and utility connections completed, and the ring aligned in October.
System testing took place in November and beam commissioning is now
in progress. Beam was returned to users in March of 2004.
SPEAR3 will operate at 100 mA until all beam line optical components are upgraded, radiation shielding is added, and approved is received for higher current operation. The accelerator physics and engineering groups will fully utilize AP time characterize and optimize ring lattice and beam parameters, develop the fast orbit feedback system (having a 4 kHz orbit acquisition rate), and to ascertain beam stability issues that might be encountered at higher currents.