| Paper |
Title |
Page |
| THPCH039 |
Beam Studies with Coherent Synchrotron Radiation from Short Bunches in the ANKA Storage Ring
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2868 |
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- A.-S. Müller, I. Birkel, S. Casalbuoni, B. Gasharova, E. Huttel, Y.-L. Mathis, D.A. Moss, P. Wesolowski
FZK, Karlsruhe
- C. J. Hirschmugl
UWM, Milwaukee, Wisconsin
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In the ANKA storage ring it is possible to store bunches with RMS lengths of the order of 1 ps using a dedicated optics with reduced momentum compaction factor. For short bunch operation a beam energy of 1.3 GeV is chosen as a trade-off between low energy longitudinal instabilities and the increase in natural bunch length with energy. At this medium energy (the energy range of the ANKA storage ring is 0.5 to 2.5 GeV) steady state emission of coherent synchrotron radiation is observed by the ANKA-IR beamline below the threshold current defined by the micro-bunching instability. At lower beam energies where the natural bunch length is significantly shorter, bursts of coherent synchrotron radiation are detected in spite of the longitudinal oscillation. The far infrared spectrum is sensitive to the dynamics of the charge distribution generating the radiation. Measurements of the frequency spectrum of the infrared detector signal add information on bunch dynamics. This paper gives an overview of the studies performed at the ANKA storage ring.
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| THPLS122 |
Investigations of the Thermal Beam Load of a Superconducting In-vacuum Undulator
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3568 |
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- S. Casalbuoni, MH. Hagelstein, B.K. Kostka, R. Rossmanith
FZK, Karlsruhe
- T. Baumbach, A. Bernhard, D. Wollmann
University of Karlsruhe, Karlsruhe
- E. Steffens, M. Weisser
Erlangen University, Erlangen
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Both the resistive wall effect and the synchrotron radiation~\cite{wallen, casalbuoni, chou} can warm up the cold bore of a superconductive in-vacuum undulator. For the in ANKA installed superconducting undulator measurements showed that the dominant heat load contribution comes from the synchrotron radiation generated in the upstream bending magnet: 1 W per 100 mA stored current at a beam energy of 2.5 GeV and an undulator gap of 8 mm.
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| THPLS123 |
A Year's Experience with a Superconducting Undulator in the Storage Ring ANKA
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3571 |
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- R. Rossmanith, S. Casalbuoni, MH. Hagelstein, B.K. Kostka, A.-S. Müller
FZK, Karlsruhe
- T. Baumbach, A. Bernhard, D. Wollmann
University of Karlsruhe, Karlsruhe
- R. Frahm, B. Griesebock, U. Haake
BUW, Wuppertal
- F. Schoeck, E. Steffens, M. Weisser
University of Erlangen-Nürnberg, Physikalisches Institut II, Erlangen
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In ANKA the worldwide first superconducting undulator demonstrator designed for a storage ring was operated during the last year. The undulator has 100 periods and a period length of 14 mm. During the first year the heat transfer from the beam to the cold bore was investigated and the spectra and the electrical tunability together with a monochromator was measured. The results are so encouraging that plans exist to equip ANKA with two more undulators, one with the opportunity to double electrically the period length and one with electrically variable polarization direction.
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| THPLS124 |
The Second Generation of Superconductive Insertion Devices for ANKA
|
3574 |
| |
- A. Bernhard, T. Baumbach, D. Wollmann
University of Karlsruhe, Karlsruhe
- S. Casalbuoni, MH. Hagelstein, R. Rossmanith
FZK, Karlsruhe
- T. Schneider
FZ Karlsruhe, Karlsruhe
- F. Schoeck, E. Steffens, M. Weisser
University of Erlangen-Nürnberg, Physikalisches Institut II, Erlangen
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After the superconducting undulator SCU14 was installed and successfully started operation at ANKA in spring 2005, a second generation of superconducting insertion devices for ANKA is under development. The ANKA soft x-ray analytics beamline WERA is planned to be equipped with a superconducting elliptically polarising undulator (SCEPU) with electrically tunable polarisation, and a superconducting combined undulator/wiggler (SCUW) capable of period tripling will serve as the source for the planned ANKA imaging beamline. In this paper the studies on the ANKA superconducting EPU and the status of the SCUW-project will be reviewed.
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| THPLS125 |
A Concept on Electric Field Error Compensation for the ANKA Superconductive Undulator
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3577 |
| |
- D. Wollmann, T. Baumbach, A. Bernhard
University of Karlsruhe, Karlsruhe
- S. Casalbuoni, MH. Hagelstein, B.K. Kostka, R. Rossmanith
FZK, Karlsruhe
- G. Gerlach
University of Dresden, Institute for Solid-State Electronics, Dresden
- F. Schoeck, E. Steffens, M. Weisser
University of Erlangen-Nürnberg, Physikalisches Institut II, Erlangen
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In April 2005 a superconductive undulator test device, the so-called SCU14 (period length 14 mm, 100 periods) was installed at ANKA. Before installation, the magnetic field was measured and documented. This was the first test of a superconductive undulator in a storage ring and the dominating questions to be answered were related to the interaction of the undulator with the beam. The field quality was of lower importance and will be improved by a modified mechanical fabrication technique at the next superconductive undulators. Nevertheless, after finishing the fundamental beam tests the question was discussed how one would improve the field quality (minimize the phase error) of the existing undulator by local correction devices. The concepts could be used later in a weaker form for local field corrections at future undulators, if necessary.
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