| Paper |
Title |
Page |
| TUPCH050 |
Beam Profile Measurements with the 2-D Laser-wire
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1121 |
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- G.A. Blair, I.V. Agapov, S.T. Boogert, G.E. Boorman, A. Bosco, J. Carter, C. Driouichi, M.T. Price
Royal Holloway, University of London, Surrey
- K. Balewski, H.-C. Lewin, F. Poirier, S. Schreiber, K. Wittenburg
DESY, Hamburg
- N. Delerue, D.F. Howell
OXFORDphysics, Oxford, Oxon
- T. Kamps
BESSY GmbH, Berlin
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A new laser-wire system has been installed at the PETRA ring at DESY, Hamburg. The system is set up to scan in two dimensions using piezo-driven mirrors and employs a newly acquired injection seeded Q-switched laser. The system is described and first results are presented.
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| WEPCH016 |
Spurious Vertical Dispersion Correction for PETRA III
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1954 |
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- G.K. Sahoo, K. Balewski, W. Decking
DESY, Hamburg
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Spurious vertical dispersion, arising due to the misalignment and rotational errors of magnets in synchrotron radiation sources with low emittances, are highly undesirable as this contributes to the vertical beam size of the photon beam. This is a matter of concern in PETRA III, a 6GeV light source with a designed horizontal emittance of 1nm.rad and 1% emittance coupling. It has a hybrid lattice of FODO and DBA cells, which will be installed in one-eighth of the existing PETRA II ring. In this paper local and global vertical dispersion corrections are discussed. The global vertical dispersion is corrected using vertical corrector magnets (may also consider 12 skew quadrupole magnets), and the skew quadrupoles are used for local correction as well. Eight of them are placed close to the two damping wiggler sections used for minimizing the horizontal emittance. The remaining four are placed in the new octant with DBA cells where insertion devices are installed.
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| THPLS020 |
Progress Report on PETRA III
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3317 |
| |
- K. Balewski
DESY, Hamburg
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Starting from the middle of 2007, the existing storage ring PETRA II at DESY will be converted into the hard x-ray light source PETRA III. The project was launched in 2002, and in preparation of the conversion a technical design report was published in 2004. Since then detailed design and construction of technical components have begun. Prototypes have been built and tested and the procurement of major parts of the machine components such as magnets and vacuum chambers has started. The project is well underway and in line with the goal of starting the rebuilding in 2007 and the commissioning in 2009. In addition to an overall status report, the development of components and measurement results of prototypes will be presented.
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| THPLS021 |
Dynamic Aperture Studies for PETRA III
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3320 |
| |
- Y.J. Li, K. Balewski, W. Decking
DESY, Hamburg
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PETRA III is a low-emittance storage ring dedicated to synchrotron radiation. For efficient injection in the top-up mode, the dynamic aperture has to be larger than 30 mm-mrad in the horizontal plane. This paper presents the choice of tunes and the optimization of the sextupole configuration. Tracking simulations have been performed, including the non-linear effects of 20 four-meters-long damping wigglers and a representative set of undulators. Misalignment and multipole errors are considered as well, leading to specifications for the magnet design and alignment procedure.
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| THPLS023 |
Wake Computations for the Beam Positioning Monitors of PETRA III
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3326 |
| |
- A.K. Bandyopadhyay, A. Joestingmeier, A.S. Omar
Otto-Von-Guericke University, Magdeburg
- K. Balewski, R. Wanzenberg
DESY, Hamburg
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At DESY it is planned to convert the PETRA ring into a synchrotron radiation facility, called PETRA III, in 2007. For proper design of PETRA III it is very important to estimate the wakes due to various discontinuities along the beam pipe. This article is on the wake computations for the beam positioning monitors (BPMs) in the PETRA III beam pipe. Two computer codes, namely MAFIA and Microwave Studio, were used for the electromagnetic field computations. Convergence tests and the agreement between the results of both softwares were taken as criteria in order to validate the results.
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| THPLS121 |
Status of the PETRA III Damping Wigglers
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3565 |
| |
- M. Tischer, K. Balewski, M. Seidel, L. Yongjun
DESY, Hamburg
- A.A. Krasnov, V. Kuzminykh, E. Levichev, P. Vobly, K. Zolotarev
BINP SB RAS, Novosibirsk
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After mid-2007, the present PETRA storage ring at DESY will be reconstructed towards a dedicated third generation light source operating at 6 GeV. An emittance reduction down to 1 nm can be achieved by means of damping wigglers. 20 permanent magnet wigglers will be installed in two of the long straights of the machine. The wiggler segments are compact fixed gap devices surrounded by iron enclosures to reduce the leakage flux. Each device will provide a damping integral of 4 T2m per segment and generate a synchrotron radiation power of 42 kW. Every wiggler segment will be followed by an SR-absorber to protect all downstream components, the accumulated on-axis power of about 200 kW will be taken up by a final absorber at the damping section end. The wiggler's magnetic design, field properties and correction schemes have previously been proven by a one period long prototype. At present, the first full length (4m) prototype wiggler has been assembled and characterized magnetically.
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