| Paper |
Title |
Page |
| MPPE044 |
Damping Wiggler Study at KEK-ATF
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2809 |
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- T. Naito, H. Hayano, Y. Honda, K. Kubo, M. Kuriki, S. Kuroda, T. Muto, N. Terunuma, J.U. Urakawa
KEK, Ibaraki
- M. Korostelev, F. Zimmermann
CERN, Geneva
- N. Nakamura, H. Sakai
ISSP/SRL, Chiba
- M.C. Ross
SLAC, Menlo Park, California
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The effects by damping wiggler magnets have been studied at KEK-ATF. The damping ring of the KEK-ATF is a 1.3 GeV storage ring capable of producing ultra-low emittance electron beams. It is significant issue to realize fast damping in the damping ring. The tuning method with 4 sets of wiggler was investigated for the ultra-low emittance beam. The performance on the beam quality, which is related to the transverse (x and y) and the longitudinal (z and dp/p), has been measured by the SR monitor, the laser wire, the streak camera and the energy spread monitor at the extraction line. We report on the operation condition and the measurement results.
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| TPPT049 |
Design and Cold Model Test of 500MHz Damped Cavity for ASP Storage Ring RF System
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3076 |
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- J. Watanabe, K. Nakayama, K. S. Sato, H. Suzuki
Toshiba, Yokohama
- M. Izawa
KEK, Ibaraki
- A. Jackson, G. LeBlanc, K. Zingre
ASP, Clayton, Victoria
- T. Koseki
RIKEN/RARF/CC, Saitama
- N. Nakamura, H. Sakai, H. Takaki
ISSP/SRL, Chiba
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TOSHIBA is constructing the storage ring RF system for the Australian Synchrotron Project(ASP). Two pairs of the 500MHz Higher Order Mode(HOM) damped cavities will be applied for this system. The cavities are modified KEK-PF type with silicon-carbide(SiC) microwave absorber and added three HOM anttenas for damping the longitudinal HOM impedance less than 20kOhm/GHz to meet requirement of ASP specification. The shunt impedance has been improved more than 5% in comparison with the original design by reducing the beam bore diameter without degrading HOM damping capability. The design of the cavity and the test results of an Al cold model are described.
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| RPAE040 |
COD Correction at the PF and PF-AR by New Orbit Feedback Scheme
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2613 |
| |
- K. Harada, T. Obina
KEK, Ibaraki
- N. Nakamura, H. Sakai, H. Takaki
ISSP/SRL, Chiba
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The eigen-vector method with a constraint condition is a new COD correction method that enables us to combine the local orbit correction at the insertion devices with the global COD correction by integrating the local one into the global one as the constraint condition using the Lagrange’s undetermined multiplier method. In order to achieve this method, we only use the new contrived response matrix for the global COD correction where the local correction is involved and done simultaneously. We have tested this correction scheme at the PF ring and the PF-AR. In the machine studies, the new orbit correction method is successfully demonstrated. The RMS COD of the constraint BPMs are sufficiently suppressed and, on the other hand, there is almost no large difference in the RMS COD of all the other BPMs between the new and ordinary methods.
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| RPPE040 |
Development of Copper Coated Chamber for Third Generation Light Sources
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2633 |
| |
- H. Sakai, I. Ito, H. Kudo, N. Nakamura, S. Shibuya, K. Shinoe, H. Takaki
ISSP/SRL, Chiba
- K. Kobayashi
KEK, Ibaraki
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For the 3rd generation light sources, it is essential to reduce the beam instability in order to produce the highly bright synchrotron light much stably. Especially, to avoid the coupled bunch instability, the resistive wall impedance must be reduced. The copper-coating inner surface of the chamber(especially in insertion device section)is much effective method for the reduction of the resistive wall impedance, whose method was already proposed by our group (N.Nakamura et.al., EPAC 1998 p984). We have already produced the copper coated chamber. In this paper, we describe the measurement of the outgassing from the copper coated chamber to evaluate if this chamber is valid on the ultra-low high vacuum condition.
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