Abstracts Brochure - CERN

WEPCH025
WEPCH026
WEPCH027
WEPCH028
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
COD Correction at the PF Ring by New Orbit Feedback Scheme
K. Harada, T. Obina (KEK) N. Nakamura, H. Sakai, H. Takaki (ISSP/
SRL)
280
When we correct the global COD (closed orbit
distortion), if we use the modified conversion
matrix calculated by the eigen vector
method with constraint conditions (EVC),
the local orbit correction can be simultaneously done to fix the light source point in the insertion device. In the EVC,
the local orbit correction is combined to the global orbit correction by the Lagrange’s undetermined multiple method.
In this paper, we show the machine study results at the PF Ring.
Recent Progress of Optics Measurement and Correction at KEKB
A. Morita, H. Koiso, Y. Ohnishi, K. Oide (KEK)
beta correction.
We present the progress of the optics measurement
and the correction scheme of the
KEKB operation for example off-momentum
Measurements of Beam Orbit and Beam Optics Using Single-pass BPMs at KEKB
Y. Ohnishi, S. Hiramatsu, I. Ishii, H. Koiso, KM. Mori, M. Tejima
(KEK)
Single-pass BPMs have been developed for
measurements of injection beam and beam
optics such as betatron phase advance between
BPM monitors and x-y couplings. We
present performance of the single-pass BPMs and analysis of beam orbit and optics at KEKB storage ring.
Position Shuffling of the J-PARC Main Ring Magnets
M. Tomizawa, K. Fan, S. Igarashi, K. Ishii, H. Kobayashi, A.Y.
Molodozhentsev, K. Niki, E. Yanaoka (KEK) Y. Irie (JAEA/J-PARC)
S. Machida (CCLRC/RAL/ASTeC)
The J-PARC 50GeV main ring has 96 dipole,
216 quadrupole with 11 families and 72 sextupole
magnets with 3 families. Magnets installation
in the tunnel started last year and
will be planed to finish by the end of next
fiscal year. Field measurements of all magnets will soon finish by this March. Deviations for BL, B’L, B"L in dipole,
quadrupole and sextupole magnets make COD, beta beat and third integer stopband, respectively. They can be
reduced by choosing a pair of magnets with similar field deviation and by positioning them so as to cancel each other
considering betatron phase (shuffling). In this paper, we will report our shufflling scheme chosen under the given
schedule for installation and field measurements and also will show performances expected by the shufflings.