| Paper |
Title |
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| MOPC032 |
Progress of the Commissioning of the Test FEL at MAX-lab
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139 |
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- S. Thorin, F. Curbis, N. Cutic, F. Lindau, S. Werin
MAX-lab, Lund
- M. Abo-Bakr, J. Bahrdt, K. Holldack
BESSY GmbH, Berlin
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In a collaboration between MAX-lab and BESSY a seeded Harmonic Generation Free Electron Laser is being constructed at MAX-lab. The setup uses the existing MAX-lab facility together with a Ti:Sa 266 nm lasersytem used for both the gun and seeding and an optical klystron consisting of a modulator, a chicane and a radiator. The different parts of the system has been installed and commissioning with electrons of the full setup started during the fall of 2007. In this paper the progress of the commissioning of the Test FEL and our initial results are presented.
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| WEPC096 |
APPLE Undulator for PETRA III
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2219 |
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- J. Bahrdt, H.-J. Baecker, W. Frentrup, A. Gaupp, M. Scheer, B. Schulz
BESSY GmbH, Berlin
- U. Englisch, M. Tischer
DESY, Hamburg
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Currently, the storage ring PETRA is being rebuilt to a light source with an ultra low emittance of only 1nm rad. The undulator radiation will take full advantage of this high performance. PETRA III will also provide circularly polarized light and linearly polarized light under arbitrary angles (inclined mode) within the energy range of 250-3000eV. The light will be produced with an APPLE II undulator which is under construction at BESSY at present. The total length of 5m and a minimum gap of only 11mm cause strong 3D forces. Due to the small good field region in an APPLE undulator and a small stay clear between the magnets and the vacuum chamber a sophisticated mechanical layout is required. The design will be presented, the expected residual mechanical deformations will be given and the consequences for the spectral performance will be discussed.
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| WEPC097 |
Active Shimming of the Dynamic Multipoles of the BESSY UE112 APPLE Undulator
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2222 |
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- J. Bahrdt, W. Frentrup, A. Gaupp, M. Scheer, G. Wuestefeld
BESSY GmbH, Berlin
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APPLE undulators produce strong dynamic multipoles in the elliptical and inclined mode which can significantly reduce the electron beam dynamic aperture. The multipole strength scales with the square of the period length and the inverse of the electron energy. A large horizontal dynamic aperture is essential for top up operation. For the BESSY devices the dynamic multipoles generated in the elliptical mode have efficiently been compensated with iron shims. For the inclined mode no passive compensation scheme is available. In case of the strong BESSY 112mm APPLE device flat current wires have been glued onto the undulator chamber, which permit the cancellation of arbitrary multipoles. The full horizontal dynamic aperture has been recovered in the inclined mode. Tracking simulations and measurements of the electron beam performance for uncompensated and compensated dynamic multipoles will be presented.
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| WEPC101 |
Improved Homogeneity of Permanent Magnets for Undulators and Wigglers
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2234 |
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- F.-J. Boergermann, R. Blank, G. W. Reppel
Vacuumschmelze GmbH & Co. KG, Hanau
- J. Bahrdt
BESSY GmbH, Berlin
- J. Pflueger
DESY, Hamburg
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The homogeneity of permanent magnets for use in undulators and wigglers were significantly improved in close collaboration between industry and scientific institutes throughout the last three years. Magnets with a variation of less than ± 1% in remanence, ± 1° magnetic angle and ± 1% hot/cold-side effect can be produced now - a variation of the magnetic angle of less than ± 0.5 ° is possible for some products. The development was assisted by improved characterization equipment for magnetic dipole moment and magnetic inhomogeneities by the scientific partners, which was made available for industrial application at Vacuumschmelze.
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