IPAC2012 - List of Authors (Schuh, M.)

Paper	Title	Page
MOPPP003	Comparison of Various Sources of Coherent THz Radiation at FLUTE	568
	M. Schwarz, E. Huttel, A.-S. Müller, S. Naknaimueang, M.J. Nasse, R. Rossmanith, M. Schuh, P. Wesolowski KIT, Eggenstein-Leopoldshafen, Germany M.T. Schmelling MPI-K, Heidelberg, Germany
	The "Ferninfrarot Linac- Und Test-Experiment" FLUTE, based on a 50 MeV S-band linac with bunch compressor, is currently under construction at the KIT in Karlsruhe in order to study the production of coherent radiation in the Terahertz frequency range. The three photon generating mechanisms investigated in this paper are coherent synchrotron-, edge-, and transition radiation. For each case, we present the spectra and peak electric fields calculated from longitudinal charge distributions of a short, low charge and a long, high charge bunch. The respective bunch shapes are obtained by a detailed simulation (particle tracking) of FLUTE. We also give the expected temporal evolution of the electric field pulses.

TUPPP012	Optimization of the Beam Optical Parameters of the Linac-based Terahertz Source FLUTE	1629
	S. Naknaimueang, E. Huttel, A.-S. Müller, M.J. Nasse, R. Rossmanith, M. Schuh, M. Schwarz, P. Wesolowski KIT, Eggenstein-Leopoldshafen, Germany M.T. Schmelling MPI-K, Heidelberg, Germany
	Funding: Karlsruher Institut für Technologie. FLUTE is a compact accelerator (consisting of a 7 MeV laser gun, a 50 MeV linac, and bunch compressors) under construction at KIT in Karlsruhe for producing coherent THz radiation. The programs ASTRA and CSRtrack were used to optimize the beam parameters. The aim was to minimize the bunch length used in various THz experiments, with bunch charges between 100 pC and 3 nC. It was calculated that the bunch length after compression depends both on the bunch current and the transverse beam size. The transverse beam size depends on the laser spot size at the cathode of the 7 MeV laser gun. Further simulations showed that a larger beam size reduces the efficiency of the compressor. This problem is cured by focusing elements with a focusing strength depending on the space charge after the gun and integrated into the various compressors layouts under study (four magnets, two magnets and quadrupoles, etc.). The results of these calculations are presented in this paper.

MOPPR021	Commissioning of a New Beam-position Monitoring System at ANKA	825
	S. Marsching, N. Hiller, E. Huttel, V. Judin, B. Kehrer, M. Klein, C.A.J. Meuter, A.-S. Müller, M.J. Nasse, M. Schuh, N.J. Smale, M. Streichert KIT, Karlsruhe, Germany G. Rehm Diamond, Oxfordshire, United Kingdom
	A new beam-position monitoring and diagnostic system is being commissioned at ANKA, the synchrotron light source of the Karlsruhe Institute of Technology. This system is based on 40 Libera Brilliance devices from Instrumentation Technologies. It provides turn-by-turn information about the beam position. This information can be used for beam diagnostics (e.g. finding the position where the beam is lost during injection phase) and can also form the base of a fast orbit-correction scheme. We have performed studies to assess the performance of the new BPM system in comparison to the old system being replaced. In order to optimize the commissioning process we have developed a scheme for switching to the new system gradually by integrating it with the MATLAB Middle-Layer using EPICS control software. In this contribution we present the results of our comparison of the two BPM systems and provide an insight into the experience gained during the commissioning process.

TUPPP010	Spectral and Temporal Observations of CSR at ANKA	1623
	V. Judin, N. Hiller, A. Hofmann, E. Huttel, B. Kehrer, M. Klein, S. Marsching, C.A.J. Meuter, A.-S. Müller, M. Schuh, M. Schwarz, N.J. Smale, M. Streichert KIT, Karlsruhe, Germany M.J. Nasse Karlsruhe Institute of Technology (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. ANKA is a synchrotron light source situated at the Karlsruhe Institute of Technology. Using dedicated low-α-optics at ANKA we can reduce the bunch length and generate Coherent Synchrotron Radiation (CSR). Studies of the coherent emission in the time domain allow us to gain an insight into the longitudinal bunch dynamics. These as well as the systematic investigations of the THz spectrum range can be used for benchmarking of theoretical predictions. In this paper we report about the recent progress in CSR observation using fast THz detectors and a Martin-Puplett spectrometer at the ANKA storage ring.

Paper

Title

Page

Comparison of Various Sources of Coherent THz Radiation at FLUTE

568

M. Schwarz, E. Huttel, A.-S. Müller, S. Naknaimueang, M.J. Nasse, R. Rossmanith, M. Schuh, P. Wesolowski
KIT, Eggenstein-Leopoldshafen, Germany
M.T. Schmelling
MPI-K, Heidelberg, Germany

The "Ferninfrarot Linac- Und Test-Experiment" FLUTE, based on a 50 MeV S-band linac with bunch compressor, is currently under construction at the KIT in Karlsruhe in order to study the production of coherent radiation in the Terahertz frequency range. The three photon generating mechanisms investigated in this paper are coherent synchrotron-, edge-, and transition radiation. For each case, we present the spectra and peak electric fields calculated from longitudinal charge distributions of a short, low charge and a long, high charge bunch. The respective bunch shapes are obtained by a detailed simulation (particle tracking) of FLUTE. We also give the expected temporal evolution of the electric field pulses.

TUPPP012

Optimization of the Beam Optical Parameters of the Linac-based Terahertz Source FLUTE

1629

S. Naknaimueang, E. Huttel, A.-S. Müller, M.J. Nasse, R. Rossmanith, M. Schuh, M. Schwarz, P. Wesolowski
KIT, Eggenstein-Leopoldshafen, Germany
M.T. Schmelling
MPI-K, Heidelberg, Germany

Funding: Karlsruher Institut für Technologie.
FLUTE is a compact accelerator (consisting of a 7 MeV laser gun, a 50 MeV linac, and bunch compressors) under construction at KIT in Karlsruhe for producing coherent THz radiation. The programs ASTRA and CSRtrack were used to optimize the beam parameters. The aim was to minimize the bunch length used in various THz experiments, with bunch charges between 100 pC and 3 nC. It was calculated that the bunch length after compression depends both on the bunch current and the transverse beam size. The transverse beam size depends on the laser spot size at the cathode of the 7 MeV laser gun. Further simulations showed that a larger beam size reduces the efficiency of the compressor. This problem is cured by focusing elements with a focusing strength depending on the space charge after the gun and integrated into the various compressors layouts under study (four magnets, two magnets and quadrupoles, etc.). The results of these calculations are presented in this paper.

MOPPR021

Commissioning of a New Beam-position Monitoring System at ANKA

825

S. Marsching, N. Hiller, E. Huttel, V. Judin, B. Kehrer, M. Klein, C.A.J. Meuter, A.-S. Müller, M.J. Nasse, M. Schuh, N.J. Smale, M. Streichert
KIT, Karlsruhe, Germany
G. Rehm
Diamond, Oxfordshire, United Kingdom

A new beam-position monitoring and diagnostic system is being commissioned at ANKA, the synchrotron light source of the Karlsruhe Institute of Technology. This system is based on 40 Libera Brilliance devices from Instrumentation Technologies. It provides turn-by-turn information about the beam position. This information can be used for beam diagnostics (e.g. finding the position where the beam is lost during injection phase) and can also form the base of a fast orbit-correction scheme. We have performed studies to assess the performance of the new BPM system in comparison to the old system being replaced. In order to optimize the commissioning process we have developed a scheme for switching to the new system gradually by integrating it with the MATLAB Middle-Layer using EPICS control software. In this contribution we present the results of our comparison of the two BPM systems and provide an insight into the experience gained during the commissioning process.

TUPPP010

Spectral and Temporal Observations of CSR at ANKA

1623

V. Judin, N. Hiller, A. Hofmann, E. Huttel, B. Kehrer, M. Klein, S. Marsching, C.A.J. Meuter, A.-S. Müller, M. Schuh, M. Schwarz, N.J. Smale, M. Streichert
KIT, Karlsruhe, Germany
M.J. Nasse
Karlsruhe Institute of Technology (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.
ANKA is a synchrotron light source situated at the Karlsruhe Institute of Technology. Using dedicated low-α-optics at ANKA we can reduce the bunch length and generate Coherent Synchrotron Radiation (CSR). Studies of the coherent emission in the time domain allow us to gain an insight into the longitudinal bunch dynamics. These as well as the systematic investigations of the THz spectrum range can be used for benchmarking of theoretical predictions. In this paper we report about the recent progress in CSR observation using fast THz detectors and a Martin-Puplett spectrometer at the ANKA storage ring.