IPAC2016 - List of Authors (Mueller, 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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

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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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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

Export •

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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

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)