Abstracts Brochure - CERN

WEPCH049
WEPCH050
WEPCH051
WEPCH052
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
or compensate field errors of the main magnets (among others those due to hysteresis), are in their turn hysteretic.
The measured magnetic hysteresis and its possible influence on accelerator operation will be presented, in particular
the real-time compensation of decay and snapback in the main magnets, and the reproducibility between runs. A
detailed characterization of minor hysteresis loops is given, as well as degaussing cycles and modeling work.
Closed Orbit Correction of TPS Storage Ring
A 3 GeV synchrotron storage ring is pro-
H.-J. Tsai, H.-P. Chang, C.-C. Kuo (NSRRC)
posed in Taiwan to serve the synchrotron
light users, especially for the x-ray community.
The ring consists of 24 double-bend cells with 6-fold symmetry and the circumference is 518.4 m. The designed
natural emittance with slightly positive dispersion in the straight sections is less than 2 nm-rad. This low emittance
lattice structure needs strong quadrupoles and sextupoles and the closed orbit distortions are sensitive to the alignment
errors in the quadrupoles and sextupoles as well. The closed orbit distortions due to tolerable magnetic errors
are simulated and the correction scheme is proposed. Using singular value decomposition method, the closed orbit
distortions are corrected and corrector strengths as well as the residual closed orbit distortions are obtained.
Corrections of Vertical Dispersion and Betatron Coupling for the TPS Storage Ring
A proposed 3 GeV Taiwan Photon Source
H.-J. Tsai, H.-P. Chang, C.-C. Kuo (NSRRC)
(TPS) is a low emittance (1.7 nm-rad)
medium energy storage ring with 24 DBA
cells. The vertical emittance due to betatron coupling and spurious vertical dispersion generated by the magnet errors
and off-center orbits in sextupoles and quadrupoles are analyzed. The sensitivities due to standard magnetic errors
are estimated. With SVD method, a global vertical dispersion and betatron coupling correction is discussed.
Isochronous Magneto-optical Structure of the Recirculator SALO
I.S. Guk, A. Dovbnya, S.G. Kononenko, F.A. Peev, A.S. Tarasenko
(NSC/KIPT) J.I.M. Botman, M.J. Van der Wiel (TUE)
286
With the goal to provide low energy spread
of electron beam, the magneto-optical structure
of the recirculator SALO has been modified.
All of its parts (an injection tract and
arcs) were made isochronous and achromatic. Besides, with the purpose of the accelerating structure arrangement,
the length of straight sections was enlarged. The amplitude and dispersion functions on various recirculator sections
and design characteristics of the beam are submitted.
Injection System for Kharkov X-ray Source NESTOR
During the last three years a Kharkov X-ray
A.Y. Zelinsky, P. Gladkikh, A. Mytsykov (NSC/KIPT)
generator NESTOR is under design and construction
in NSC KIPT. According to the design
report, electrons are injected in the storage ring at 100 MeV and ramped up to final energy 225 MeV. Due to
compact design of the ring the injection trajectory of the beam will pass through fringe field of a NESTOR bending