Abstracts Brochure - CERN

THPLS — Poster Session 29-Jun-06 16:00 - 18:00
bunches, a local vertical dispersion bump created by 12 skew quadrupoel magnets is used. The paper will present
the experience with the completed beamline upgrade in routine user operation.
Status of the Top-off Upgrade of the ALS
In order to provide higher brightness and
better stability, the ALS is being upgraded to C. Steier, D. Robin (LBNL)
top-off injection. One main part of the topoff
modifications is an upgrade of the booster as well as extraction and injection elements and the transfer line for full
energy. Further upgrades include new diagnostics, improved controls and timing system, and new radiation safety
systems (monitors and interlocks).
Implementation of the Double-waist Chicane Optics in SPEAR 3
The SPEAR 3 upgrade produced two new 7.6
m racetrack straight sections in the 18 cell,
234 m magnet lattice. One of these straights
houses four PEP-II style mode-damped RF
W.J. Corbett, D. Dell’Orco, R.O. Hettel, T. Rabedeau, A. Ringwall,
J.A. Safranek, J. Tanabe, A. Terebilo (SLAC)
cavities. The other straight will accommodate two new small-gap insertion devices separated by 10mrad in a magnetic
chicane configuration. A quadrupole triplet has been installed at the midpoint of the chicane and the vertical tune
has been raised by an integer to create a ’double waist’ optics with betay = 1.6m in the center of each ID. Furthermore,
as part of the optics upgrade, betay in the four straights adjacent to the racetrack sections was reduced from 5m to
2.5m. In this paper, we describe the physical implementation of the double-waist chicane optics and initial operational
results.
Perfomance and Design of the SPEAR3 Vacuum System
The SPEAR3 vacuum system has been operating
successfully for over two years. N. Kurita, R.O. Hettel, J. Langton, A. Ringwall, J.A. Safranek (SLAC)
SPEAR3 was an upgrade project for a 500
mA and 3GeV synchrotron radiation storage ring. The vacuum system has performed well, reaching the designed
pressure requirements sooner than expected and achieving long lifetimes. The designs of the copper girder chambers
and major vacuum components and a summary of the system performance are presented.
Beam Dynamics Issues of the SPEAR 3 Double-waist Chicane Optics
A quadrupole triplet has been included in
the center of a 7.6 m long chicane in SPEAR 3
to create a novel and technically challenging
’double waist’ optics with betay=1.6m at the
center of each of two future small-gap inser-
J.A. Safranek, W.J. Corbett, M. Cornacchia, R.O. Hettel, Y.
Nosochkov, T. Rabedeau, M. Rowen, A. Terebilo (SLAC) M. Yoon
(POSTECH)
tion devices. The new optics also reduces betay to 2.5m in the four adjacent 4.8m straight sections. In this paper, we
discuss key issues associated with design of the machine optics, insertion device compatibility issues, optimization
of dynamic aperture and initial measurements of machine performance in the new configuration.
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