Author: Mueller, A.-S.     [Müller, A.-S.]
Paper Title Page
MOPMB014 Simultaneous Detection of Longitudinal and Transverse Bunch Signals at ANKA 109
  • B. Kehrer, E. Blomley, M. Brosi, E. Bründermann, N. Hiller, A.-S. Müller, M.J. Nasse, M. Schedler, M. Schuh, P. Schönfeldt, P. Schütze, N.J. Smale, J.L. Steinmann
    KIT, Karlsruhe, Germany
  Funding: This work has been supported by the Initiative and Networking Fund of the Helmholtz Association under contract number VH-NG-320 and by the BMBF under contract number 05K13VKA.
The ANKA storage ring offers different operation modes including the short-bunch mode with bunch lengths tuned down to a few picoseconds. This can lead to the occurrence of micro-bunching instabilities coupled to the emission of coherent synchrotron radiation (CSR) in so-called 'bursts'. To study this CSR instability we use several turn-by-turn enabled detector systems to synchronously measure both the THz signal as well as bunch profiles. The different detectors are placed at different locations around the storage ring. Here we discuss the experimental setup and calibration of the various systems' synchronisation.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB014  
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MOPMB016 Single-Shot Spectral Analysis of Synchrotron Radiation in THz Regime at ANKA 115
  • A. Schmid, M. Brosi, E. Bründermann, K.S. Ilin, B. Kehrer, K. Kuzmin, A.-S. Müller, J. Raasch, M. Schuh, P. Schönfeldt, M. Siegel, J.L. Steinmann, S. Wuensch
    KIT, Karlsruhe, Germany
  • S.A. Kuznetsov
    NSU, Novosibirsk, Russia
  Funding: This work was supported by BMBF contract number 05K13VK4 and the Ministry of Education and Sci- ence of the Russian Federation (State Assignment Contract No. 3002).
Micro-bunching instabilities limit the longitudinal compression of bunches in an electron storage ring. They create substructures on the bunch profile of some hundred micrometer size leading to coherently emitted synchrotron radiation in the THz range. To detect the changing THz spectrum, single-shot bunch-by-bunch and turn-by-turn measurements are necessary. We present recent experiments at ANKA where the spectral information is extracted by simultaneous detection with several narrowband THz detectors, each of them sensitive in a different frequency range.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB016  
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TUPOR005 A Parallelized Vlasov-Fokker-Planck-Solver for Desktop PCs 1658
  • P. Schönfeldt, M. Brosi, A.-S. Müller, J.L. Steinmann
    KIT, Karlsruhe, Germany
  In order simulate the dynamics of an electron bunch due to the self-interaction with its own coherent synchrotron radiation it is a well established method to numerically solve the Vlasov-Fokker-Planck equation. In this paper we present a new, modularly extensible program that uses OpenCL to massively parallelize the computation, allowing a standard desktop PC to work with appropriate accuracy and yield reliable results within minutes. We provide numerical stability studies of over a huge parameter range and comparisons of our numerical results to other techniques.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR005  
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TUPOR006 Systematic Studies of Short Bunch-Length Bursting at ANKA 1662
  • M. Brosi, E. Blomley, E. Bründermann, N. Hiller, B. Kehrer, A.-S. Müller, M. Schedler, M. Schuh, P. Schönfeldt, J.L. Steinmann
    KIT, Karlsruhe, Germany
  Funding: Supported by the German Federal Ministry of Education and Research (05K13VKA), the Helmholtz Association (VH-NG-320) and by the Helmholtz International Research School for Teratronics (HIRST).
At ANKA, the Karlsruhe synchrotron radiation source, the so called short bunch-length operation mode allows the reduction of the bunch length down to a few picoseconds. The micro-bunching instability resulting from the high degree of longitudinal compression leads to fluctuations in the emitted intensity in the THz regime, referred to as bursting. For extremely compressed bunches at ANKA bursting also occurs, in a certain current range, below the main bursting threshold. This contribution shows measurements of this short bunch-length bursting and makes first comparisons with theory.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR006  
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WEPMW002 A CLIC Damping Wiggler Prototype at ANKA: Commissioning and Preparations for a Beam Dynamics Experimental Program 2412
  • A. Bernhard, S. Casalbuoni, S. Gerstl, J. Gethmann, A.W. Grau, E. Huttel, A.-S. Müller, D. Saez de Jauregui, N.J. Smale
    KIT, Eggenstein-Leopoldshafen, Germany
  • A.V. Bragin, S.V. Khrushchev, N.A. Mezentsev, V.A. Shkaruba, V.M. Tsukanov, K. Zolotarev
    BINP SB RAS, Novosibirsk, Russia
  • P. Ferracin, L. Garcia Fajardo, Y. Papaphilippou, H. Schmickler, D. Schoerling, P. Zisopoulos
    CERN, Geneva, Switzerland
  Funding: This work is partially funded by the German Federal Ministry of Education and Research under grant 05K12VK1
In a collaboration between CERN, BINP and KIT a prototype of a superconducting damping wiggler for the CLIC damping rings has been installed at the ANKA synchrotron light source. On the one hand, the foreseen experimental program aims at validating the technical design of the wiggler, particularly the conduction cooling concept applied in its cryostat design, in a long-term study. On the other hand, the wiggler's influence on the beam dynamics particularly in the presence of collective effects is planned to be investigated. ANKA's low-alpha short-bunch operation mode will serve as a model system for these studies on collective effects. To simulate these effects and to make verifiable predictions an accurate model of the ANKA storage ring in low-alpha mode, including the insertion devices is under parallel development. This contribution reports on the first operational experience with the CLIC damping wiggler prototype in the ANKA storage ring and steps towards the planned advanced experimental program with this device.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW002  
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WEPOR001 Beam Studies with a New Longitudinal Feedback System at the ANKA Storage Ring 2658
  • E. Blomley, A.-S. Müller, M. Schedler
    KIT, Karlsruhe, Germany
  With the now fully commissioned longitudinal feedback system at the ANKA Storage Ring - in addition to the already operational transverse feedback system - the stability throughout the injection process was increased considerably. This opened up the possibility to investigate beam dynamics and limitations during injection more systematically. This paper presents the results of these studies, an overview of the limiting parameters and discusses possible approaches to increase the efficiency of the injection.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR001  
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WEPOW015 Influence of Filling Pattern Structure on Synchrotron Radiation Spectrum at ANKA 2855
SUPSS010   use link to see paper's listing under its alternate paper code  
  • J.L. Steinmann, E. Blomley, M. Brosi, E. Bründermann, C.M. Caselle, N. Hiller, B. Kehrer, A.-S. Müller, M. Schedler, M. Schuh, M. Schwarz, P. Schönfeldt, M. Siegel
    KIT, Karlsruhe, Germany
  Funding: This work is supported by the Helmholtz International School for Teratronics (HIRST)
We present the effects of the filling pattern structure in multi-bunch mode on the beam spectrum. This effects can be seen by all detectors whose resolution is better than the RF frequency, ranging from stripline and Schottky measurements to high resolution synchrotron radiation measurements. Our heterodyne measurements of the emitted coherent synchrotron radiation at 270 GHz reveal discrete frequency harmonics around the 100 000th revolution harmonic of ANKA, the synchrotron radiation facility in Karlsruhe, Germany. Significant effects of bunch spacing, gaps between bunch trains and variations in individual bunch currents on the emitted CSR spectrum are described by theory and supported by observations.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW015  
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WEPOY037 Optimization of THz Radiation Pulses at FLUTE 3067
  • M. Yan, A.-S. Müller, M.J. Nasse, M. Schuh, M. Schwarz
    KIT, Karlsruhe, Germany
  The accelerator test facility FLUTE (Ferninfrarot Linac Und Test Experiment) will allow research and development in electron accelerator technology as well as photon science. Electron bunches of durations in the femtosecond range will be provided to generate intense THz radiation. Start-to-end simulation of the accelerator has been performed with the bunch length as the optimization objective. Based on the resulting charge distribution the expected THz field properties can be calculated. In this paper we combine the two tools and present first results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY037  
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