96 results on '"Nasse, Michael"'
Search Results
2. Time lapse synchrotron IR chemical imaging for observing the acclimation of a single algal cell to CO2 treatment
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Azarfar, Ghazal, Aboualizadeh, Ebrahim, Ratti, Simona, Olivieri, Camilla, Norici, Alessandra, Nasse, Michael J., Giordano, Mario, and Hirschmugl, Carol J.
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- 2021
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3. From self-organization in relativistic electron bunches to coherent synchrotron light: observation using a photonic time-stretch digitizer
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Bielawski, Serge, Blomley, Edmund, Brosi, Miriam, Bründermann, Erik, Burkard, Eva, Evain, Clément, Funkner, Stefan, Hiller, Nicole, Nasse, Michael J., Niehues, Gudrun, Roussel, Eléonore, Schedler, Manuel, Schönfeldt, Patrik, Steinmann, Johannes L., Szwaj, Christophe, Walther, Sophie, and Müller, Anke-Susanne
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- 2019
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4. Measuring the Coherent Synchrotron Radiation Far Field with Electro-Optical Techniques
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Widmann, Christina, Brosi, Miriam, Bründermann, Erik, Funkner, Stefan, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Noll, Marvin, Patil, Meghana, Reißig, Micha, and Steinmann, Johannes
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Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
For measuring the temporal profile of the coherent synchrotron radiation (CSR) a setup based on electro-optical spectral decoding (EOSD) will be installed as part of the sensor network at the KIT storage ring KARA (Karlsruhe Research Accelerator). The EOSD technique allows a single-shot, phase sensitive measurement of the complete spectrum of the CSR far field radiation at each turn. Therefore, the dynamics of the bunch evolution, e.g. the microbunching, can be observed in detail. Especially, in synchronized combination with the already established near-field EOSD, this method could provide deeper insights in the interplay of bunch profile and CSR generation for each individual electron bunch. For a successful implementation of the EOSD single shot setup, measurements with electro-optical sampling (EOS) are performed. With EOS the THz pulse shape is scanned over several turns by shifting the delay of laser and THz pulse. In this contribution different steps towards the installation of the EOSD far field setup are summarized., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand
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- 2022
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5. Terahertz sampling rates with photonic time-stretch for electron beam diagnostics
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Manzhura, Olena, Bielawski, Serge, Bründermann, Erik, Caselle, Michele, Chilingaryan, Suren, Dritschler, Timo, Funkner, Stefan, Kopmann, Andreas, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Patil, Meghana, Roussel, Eléonore, Steinmann, Johannes, and Szwaj, Christophe
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ddc:620 ,Engineering & allied operations ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
To understand the underlying complex beam diagnostic often large numbers of single-shot measurements must be acquired continuously over a long time with extremely high temporal resolution. Photonic time-stretch is a measurement method that is able to overcome speed limitations of con- ventional digitizers and enable continuous ultra-fast single- shot terahertz spectroscopy with refresh rates of trillions of consecutive frames. In this contribution, a novel ultra- fast data sampling system based on photonic time-stretch is presented and the performance is discussed. THERESA (TeraHErtz REadout SAmpling) is a data acquisition system based on the recent ZYNQ-RFSoC family. THERESA has been developed with an analog bandwidth up to 20 GHz and a sampling rate up to 90 GS/s. When combined with the photonic time-stretch setup, the system will be able to sample a THz signal with an unprecedented frame rate of 8 TS/s. Continuous acquisition for long observation times will open up new possibilities in the detection of rare events in accelerator physics., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand
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- 2022
6. Design Considerations of the Corrugated Structures in a Vacuum Chamber for Impedance Studies at KARA
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Maier, Sebastian, Brosi, Miriam, Cha, Hyuk Jin, Mochihashi, Akira, Müller, Anke-Susanne, Nasse, Michael, Schreiber, Patrick, and Schwarz, Markus
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Technology ,05 Longitudinal Diagnostics and Synchronization ,ddc:600 ,Accelerator Physics - Abstract
Two parallel, corrugated plates will be installed at the KIT storage ring KARA (KArlsruhe Research Accelerator). This impedance manipulation structure can be used to study and eventually control the electron beam dynamics and the emitted coherent synchrotron radiation (CSR) at KARA. In this contribution, we present the design of the impedance manipulation structure with corrugated plates, simulation results showing the influence of different corrugation parameters on its impedance, and the impact of this additional impedance source on the temporal changes in the emitted CSR in the presence of the microbunching instability., Proceedings of the 11th International Beam Instrumentation Conference, IBIC2022, Kraków, Poland
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- 2022
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7. Detailed Analysis of Transverse Emittance of the FLUTE Electron Bunch
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Schmelzer, Thiemo, Bründermann, Erik, Müller, Anke-Susanne, Nasse, Michael, Ruprecht, Robert, Schäfer, Jens, Schuh, Marcel, Smale, Nigel, and Wesolowski, Pawel
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Physics ,MC5: Beam Dynamics and EM Fields ,Physics::Accelerator Physics ,ddc:530 ,Accelerator Physics - Abstract
The compact and versatile linear accelerator-based test facility FLUTE (Ferninfrarot Linac- Und Test-Experiment) is operated at KIT. Its primary goal is to serve as a platform for a variety of accelerator R\ studies like the generation of strong ultra-short terahertz pulses. The amplitude of the generated coherent THz pulses is proportional to the square number of particles in the bunch. With the transverse emittance a measure for the transverse particle density can be determined. It is therefore a vital parameter in the optimization for operation. In a systematic study, the transverse emittance of the electron beam was measured in the FLUTE injector. A detailed analysis considers different influences such as the bunch charge and compares this with particle tracking simulations carried out with ASTRA. In this contribution, the key findings of this analysis are discussed., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand
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- 2022
8. Terabit sampling system with photonic time-stretch analog-to-digital converter
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Caselle, Michele, Bielawski, Serge, Manzhura, Olena, Chilingaryan, Suren, Dritschler, Timo, Ebersoldt, Andreas, Kopmann, Andreas, Nasse, Michael J., Patil, Meghana, Bründermann, Erik, Roussel, Eléonore, Szwaj, Christophe, Mueller, Anke-Susanne, Herink, Georg, and Solli, Daniel R.
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ddc:620 ,Engineering & allied operations - Abstract
The detection of rapid dynamics in diverse physical systems is traditionally very difficult and strongly dominated by several noise contributions. Laser mode-locking, electron bunches in accelerators and optical-triggered phases in materials are events that carry important information about the system from which they emerge. To under- stand the underlying dynamics of complex systems often large numbers of single-shot measurements must be acquired continuously over a long time with extremely high temporal resolution. Ultrafast real-time instruments allow the acquisition of large data sets, even for rare events, in a relatively short time period. The real-time measurement of fast single-shot events with large record lengths is one of the most challenging problems in the fields of instrumentation and measurement. In this contribution, the novel ultra-fast and continuous data sampling system THERESA using photonic time-stretch is presented and its performance is discussed. The pro- posed data acquisition system is based on the latest ZYNQ Radio Frequency System on Chip (ZYNQ-RFSoC) family from Xilinx, which combines an array of fast (GS/s) multi-channel Analog-to-Digital Converters (ADCs) with a Field Programmable Gate Array (FPGA) and a multi-core ARM processor in a single heterogeneous programmable device. The stretched pulse is sampled in parallel by 16 wideband sampling channels operating in time-interleaving mode. The sampled data is transferred by a 100 Gb Ethernet data link to the Data Acquisition (DAQ) compute node for further analysis. The combination of both, the photonic time-stretch and the fast sampling system, is capable of sampling short pulses with femtosecond time resolution. Applications of the new system, hardware implementation and the commissioning of the first system for the electron bunch diagnostics are presented.
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- 2022
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9. Simulation of the Effect of Corrugated Structures on the Longitudinal Beam Dynamics at KARA
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Maier, Sebastian, Brosi, Miriam, Mochihashi, Akira, Müller, Anke-Susanne, Nasse, Michael, Schreiber, Patrick, and Schwarz, Markus
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Physics ,MC5: Beam Dynamics and EM Fields ,Physics::Accelerator Physics ,ddc:530 ,Accelerator Physics - Abstract
Two parallel corrugated plates will be installed at the KIT storage ring KARA (KArlsruhe Research Accelerator). This impedance manipulation structure will be used to study and eventually control the beam dynamics and the emitted coherent synchrotron radiation (CSR). In this contribution, we present the results obtained with the Vlasov-Fokker-Planck solver Inovesa showing the impedance impact of different corrugated structures on the bunch and its emitted CSR power., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand
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- 2022
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10. Transverse and Longitudinal Modulation of Photoinjection Pulses at FLUTE
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Nabinger, Matthias, Müller, Anke-Susanne, Nasse, Michael, Sax, Carl, Schäfer, Jens, Widmann, Christina, and Xu, Chenran
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Physics ,Physics::Accelerator Physics ,ddc:530 ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
To generate the electrons to be accelerated, a photoinjection laser is used at the linac-based test facility FLUTE (Ferninfrarot Linac- Und Test Experiment) at the Karlsruhe Institute of Technology (KIT). The properties of the laser pulse, such as intensity, laser spot size or temporal profile, are the first parameters to influence the characteristics of the electron bunches. In order to control the initial parameters of the electrons in the most flexible way possible, the laser optics at FLUTE are therefore supplemented by additional setups that allow transverse and longitudinal laser pulse shaping by using so-called Spatial Light Modulators (SLMs). In the future, the control of the SLMs will be integrated into a Machine Learning (ML) supported feedback system for the optimization of the electron bunch properties. In this contribution the first test experiments and results on laser pulse shaping at FLUTE on the way to this project are presented., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand
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- 2022
11. Opportunities for multiple-beam synchrotron-based mid-infrared imaging at IRENI
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Nasse, Michael J., Bellehumeur, Brooke, Ratti, Simona, Olivieri, Camilla, Buschke, David, Squirrell, Jayne, Eliceiri, Kevin, Ogle, Brenda, Patterson, Catherine Schmidt, Giordano, Mario, and Hirschmugl, Carol J.
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- 2012
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12. Synchrotron infrared confocal microspectroscopic spatial resolution or a customized synchrotron/focal plane array system enhances chemical imaging of biological tissue or cells
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Wetzel, David L. and Nasse, Michael J.
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- 2011
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13. Multi-beam synchrotron infrared chemical imaging with high spatial resolution: Beamline realization and first reports on image restoration
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Nasse, Michael J., Mattson, Eric C., Reininger, Ruben, Kubala, Tim, Janowski, Sebastian, El-Bayyari, Zuheir, and Hirschmugl, Carol J.
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- 2011
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14. Implementing Electro-Optical Diagnostics for Measuring the CSR Far-Field at KARA
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Widmann, Christina, Bründermann, Erik, Caselle, Michele, Funkner, Stefan, Mai, Carsten, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Patil, Meghana, Sax, Carl, Steinmann, Johannes, and Weber, Marc
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Technology ,Physics::Accelerator Physics ,ddc:600 ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
For measuring the temporal profile of the coherent synchrotron radiation (CSR) at the KIT storage ring KARA (Karlsruhe Research Accelerator) an experimental setup based on electro-optical spectral decoding (EOSD) is currently being implemented. The EOSD technique allows single-shot, phase-sensitive measurements of the far-field radiation on a turn-by-turn basis at rates in the MHz range. Therefore, the resulting THz radiation from the dynamics of the bunch evolution, e.g. the microbunching, can be observed with high temporal resolution. This far-field setup is part of the distributed sensor network at KARA. Additionally to the information acquired from the near-field EOSD spectral decoding and the horizontal bunch profile monitor, it enables to monitor the longitudinal phase-space of the bunch. In this contribution, the characterization of the far-field setup is summarized and its implementation is discussed., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
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15. Split Ring Resonator Experiment - Simulation Results
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Schäfer, Jens, Härer, Bastian, Malygin, Anton, Müller, Anke-Susanne, Nabinger, Matthias, Nasse, Michael, Schmelzer, Thiemo, Schuh, Marcel, and Windbichler, Tonia
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Technology ,Physics::Optics ,Physics::Accelerator Physics ,ddc:600 ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
FLUTE (Ferninfrarot Linac- Und Test-Experiment) is a compact linac-based test facility for accelerator and diagnostics R An example for a new accelerator diagnostics tool currently studied at FLUTE is the split-ring-resonator (SRR) experiment, which aims to measure the longitudinal bunch profile of fs-scale electron bunches. Laser-generated THz radiation is used to excite a high frequency oscillating electromagnetic field in the SRR. Particles passing through the SRR gap are time-dependently deflected in the vertical plane, which allows a vertical streaking of an electron bunch. This principle allows a diagnosis of the longitudinal bunch profile in the femtosecond time domain and will be tested at FLUTE. This contribution presents an overview of the SRR experiment and the results of various tracking simulations for different scenarios as a function of laser pulse length and bunch charge. Based on these results possible working points for the experiments at FLUTE will be proposed., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
16. Efficient Terahertz Generation by Tilted-Pulse-Front Pumping in Lithium Niobate for the Split-Ring Resonator Experiment at FLUTE
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Nabinger, Matthias, Bründermann, Erik, Dehler, Micha, Feurer, Thomas, Funkner, Stefan, Härer, Bastian, Hayati, Mozhgan, Ischebeck, Rasmus, Moser, Matthias, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Ollmann, Zoltan, Ruprecht, Robert, Schäfer, Jens, Schlott, Volker, Schmelzer, Thiemo, and Smale, Nigel
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Technology ,MC2: Photon Sources and Electron Accelerators ,Physics::Optics ,ddc:600 ,Accelerator Physics - Abstract
A compact, longitudinal diagnostics for fs-scale electron bunches using a THz electric-field transient in a split-ring resonator (SRR) for streaking will be tested at the Ferninfrarot Linac- Und Test- Experiment (FLUTE). For this new streaking technique, intensive THz pulses are required, which will be generated by laser-based optical rectification. We present a setup for generating THz pulses using tilted-pulse-front pumping in lithium niobate at room temperature. Excited by an 800 nm Ti:Sa pump laser with 35 fs bandwidth-limited pulse length, conversion efficiencies up to 0.027% were achieved. Furthermore, the status of the SRR experiment is shown., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
17. Machine Learning Based Spatial Light Modulator Control for the Photoinjector Laser at FLUTE
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Xu, Chenran, Bründermann, Erik, Eichler, Annika, Müller, Anke-Susanne, Nasse, Michael, Santamaria Garcia, Andrea, Sax, Carl, and Widmann, Christina
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Technology ,Beam Instrumentation, Controls, Feedback and Operational Aspects [MC6] ,Physics::Optics ,Physics::Accelerator Physics ,ddc:600 ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
FLUTE (Ferninfrarot Linac- und Test-Experiment) at KIT is a compact linac-based test facility for novel accelerator technology and a source of intense THz radiation. FLUTE is designed to provide a wide range of electron bunch charges from the pC- to nC-range, high electric fields up to 1.2 GV/m, and ultra-short THz pulses down to the fs-timescale. The electrons are generated at the RF photoinjector, where the electron gun is driven by a commercial titanium sapphire laser. In this kind of setup the electron beam properties are determined by the photoinjector, but more importantly by the characteristics of the laser pulses. Spatial light modulators can be used to transversely and longitudinally shape the laser pulse, offering a flexible way to shape the laser beam and subsequently the electron beam, influencing the produced THz pulses. However, nonlinear effects inherent to the laser manipulation (transportation, compression, third harmonic generation) can distort the original pulse. In this paper we propose to use machine learning methods to manipulate the laser and electron bunch, aiming to generate tailor-made THz pulses. The method is demonstrated experimentally in a test setup., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
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18. Ultra-Fast Line-Camera KALYPSO for fs-Laser-Based Electron Beam Diagnostics
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Patil, Meghana, Br��ndermann, Erik, Caselle, Michele, Chilingaryan, Suren, Dritschler, Timo, Ebersoldt, Andreas, Funkner, Stefan, Kopmann, Andreas, M��ller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Reissig, Micha, Steinmann, Johannes, Weber, Marc, and Widmann, Christina
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Physics ,Physics::Accelerator Physics ,ddc:530 ,01 Overview and Commissioning ,Accelerator Physics - Abstract
A very common bottleneck to study short electron bunch dynamics in accelerators is a detection scheme that can deal with high repetition rates in the MHz range. The KIT electron storage ring KARA (Karlsruhe Research Accelerator) is the first storage ring with a near-field single-shot electro-optical (EO) bunch profile monitor installed for the measurement of electron bunch dynamics in the longitudinal phase-space. Using electro-optical spectral decoding (EOSD) it is possible to imprint the bunch profile on chirped laser pulses subsequently read out by a spectrometer and a camera. However, commercially available cameras have a drawback in their acquisition rate, which is limited to a few hundred kHz. Hence, we have developed KALYPSO, an ultra-fast line camera capable of operating in the MHz regime. Its modular approach allows the installation of several sensors e.g. Si, InGaAs, PbS, PbSe to cover a wide range of spectral sensitivities. In this contribution, an overview of the EOSD experimental setup and the detector system installed for longitudinal bunch studies will be presented., Proceedings of the 10th International Beam Instrumentation Conference, IBIC2021, Pohang, Rep. of Korea
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- 2021
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19. Electro-Optical Diagnostics at KARA and FLUTE – Results and Prospects
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Niehues, Gudrun, Bründermann, Erik, Caselle, Michele, Funkner, Stefan, Müller, Anke-Susanne, Nasse, Michael, Patil, Meghana, Ruprecht, Robert, Schuh, Marcel, Weber, Marc, and Widmann, Christina
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Physics ,ddc:530 ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
Electro-optical (EO) methods are nowadays well-proven diagnostic tools, which are utilized to detect THz fields in countless experiments. The world’s first near-field EO sampling monitor at an electron storage ring was developed and installed at the KIT storage ring KARA (Karlsruhe Research Accelerator) and optimized to detect longitudinal bunch profiles. This experiment with other diagnostic techniques builds a distributed, synchronized sensor network to gain comprehensive data about the phase-space of electron bunches as well as the produced coherent synchrotron radiation (CSR). These measurements facilitate studies of physical conditions to provide, at the end, intense and stable CSR in the THz range. At KIT, we also operate FLUTE (Ferninfrarot Linac- und Test-Experiment), a new compact versatile linear accelerator as a test facility for novel techniques and diagnostics. There, EO diagnostics will be implemented to open up possibilities to evaluate and compare new techniques for longitudinal bunch diagnostics. In this contribution, we will give an overview of results achieved, the current status of the EO diagnostic setups at KARA and FLUTE and discuss future prospects., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
20. Application of KALYPSO as a diagnostic tool for beam and spectral analysis
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Patil, Meghana, Bründermann, Erik, Caselle, Michele, Ebersoldt, Andreas, Funkner, Stefan, Kehrer, Benjamin, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Steinmann, Johannes, Weber, Marc, and Widmann, Christina
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Physics::Instrumentation and Detectors ,Physics ,Physics::Accelerator Physics ,ddc:530 ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
KALYPSO is a novel detector capable of operating at frame rates up to 12 MHz developed and tested at the institute of data processing and electronics (IPE) and employed at Karlsruhe Research Accelerator (KARA) which is part of the Test Facility and Synchrotron Radiation Source KIT. This detector consists of silicon, InGaAs, PbS, or PbSe line array sensor with spectral sensitivity from 350 nm to 5000 nm. The unprecedented frame rate of this detector is achieved by a custom-designed ASIC readout chip. The FPGA-readout architecture enables continuous data acquisition and real-time data processing. Such a detector has various applications in the fields of beam diagnostics and spectral analysis. KALYPSO is currently employed at various synchrotron facilities for electro-optical spectral decoding (EOSD) to study the longitudinal profile of the electron beam, to study the energy spread of the electron beam, tuning of free-electron lasers (FELs), and also in characterizing laser spectra. This contribution will present an overview of the results from the mentioned applications., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
21. Systematic Beam Parameter Studies at the Injector Section of FLUTE
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Schmelzer, Thiemo, Bründermann, Erik, Hoffmann, Daniel, Križnar, Igor, Marsching, Sebastian, Müller, Anke-Susanne, Nasse, Michael, Ruprecht, Robert, Schäfer, Jens, Schuh, Marcel, Smale, Nigel, Wesolowski, Pawel, and Windbichler, Tonia
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Physics ,MC2: Photon Sources and Electron Accelerators ,Physics::Accelerator Physics ,ddc:530 ,Accelerator Physics - Abstract
FLUTE (Ferninfrarot Linac- und Test-Experiment) is a compact linac-based test facility for accelerator R and source of intense THz radiation for photon science. In preparation for the next experiments, the electron beam of the injector section of FLUTE has been characterized. In systematic studies the electron beam parameters, e.g., beam energy and emittance, are measured with several diagnostic systems. This knowledge allows the establishment of different operation settings and the optimization of electron beam parameters for future experiments., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
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22. Impedance studies of a corrugated pipe for KARA
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Maier, Sebastian, Brosi, Miriam, Mochihashi, Akira, Müller, Anke-Susanne, Nasse, Michael, and Schwarz, Markus
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Physics ,MC5: Beam Dynamics and EM Fields ,ddc:530 ,Accelerator Physics - Abstract
At the KIT storage ring KARA (KArlsruhe Research Accelerator) it is planned to install an impedance manipulation structure in a versatile chamber to study and eventually control the influence of an additional impedance on the beam dynamics and the emitted coherent synchrotron radiation. For this purpose the impedance of a corrugated pipe is under investigation. In this contribution, we present first results of simulations showing the impact of different structure parameters on its impedance and wake potential., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
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23. Full Characterization of the Bunch-Compressor Dipoles for FLUTE
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Nie, Yuancun, Bernhard, Axel, Bründermann, Erik, Müller, Anke-Susanne, Nasse, Michael, Ruprecht, Robert, Schäfer, Jens, Schuh, Marcel, and Tong, Yimin
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Technology ,Physics::Accelerator Physics ,MC2: Photon Sources and Electron Accelerators ,ddc:600 ,Accelerator Physics - Abstract
The Ferninfrarot Linac- Und Test-Experiment (FLUTE) is a KIT-operated linac-based test facility for accelerator research and development as well as a compact, ultra-broadband and short-pulse terahertz (THz) source. As a key component of FLUTE, the bunch compressor (chicane) consisting of four specially designed dipoles will be used to compress the 40-50 MeV electron bunches after the linac down to single fs bunch length. The maximum vertical magnetic field of the dipoles reach 0.22 T, with an effective length of 200 mm. The good field region is ±40 mm and ±10.5 mm in the horizontal and vertical direction, respectively. The latest measurement results of the dipoles in terms of field homogeneity, excitation and field reproducibility within the good field regions will be reported, which meet the predefined specifications. The measured 3D magnetic field distributions have been used to perform beam dynamics simulations of the bunch compressor. Effects of the real field properties on the beam dynamics, which are different from that of the ASTRA built-in dipole field, will be discussed., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
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24. Modern Ultra-Fast Detectors for Online Beam Diagnostics
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Patil, Meghana, Bründermann, Erik, Caselle, Michele, Ebersoldt, Andreas, Funkner, Stefan, Kehrer, Benjamin, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Steinmann, Johannes, Wang, Weijia, Weber, Marc, and Widmann, Christina
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Technology ,Physics::Instrumentation and Detectors ,Physics::Accelerator Physics ,ddc:600 ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
Synchrotron light sources operate with bunch repetition rates in the MHz regime. The longitudinal and transverse beam dynamics of these electron bunches can be investigated and characterized by experiments employing linear array detectors. To improve the performance of modern beam diagnostics and overcome the limitations of commercially available detectors, we have at KIT developed KALYPSO, a detector system operating with an unprecedented frame rate of up to 12 MHz. To facilitate the integration in different experiments, a modular architecture has been utilized. Different semiconductor microstrip sensors based on Si, InGaAs, PbS, and PbSe can be connected to the custom-designed low noise front-end ASIC to optimize the quantum efficiency at different photon energies, ranging from near-UV, visible, and up to near-IR. The front-end electronics are integrated within a heterogeneous DAQ consisting of FPGAs and GPUs, which allows the implementation of real-time data processing. This detector is currently installed at KARA, European XFEL, FLASH, Soleil, DELTA. In this contribution, we present the detector architecture, the performance results, and the ongoing technical developments., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
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- 2021
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25. Diagnostics of longitudinal bunch instabilities at KARA
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Kehrer, Benjamin, Brosi, Miriam, Bründermann, Erik, Funkner, Stefan, Nasse, Michael J., Niehues, Gudrun, Patil, Meghana M., Steinmann, Johannes L., and Müller, Anke-Susanne
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Physics ,Physics::Accelerator Physics ,ddc:530 - Abstract
KARA, the Karlsruhe Research Accelerator, can be operated in different modes, including a short-bunch mode. During this mode, where the dispersion is stretched in order to reduce the momentum-compaction factor, micro-bunching instability can occur. At KARA, several measurement setups and techniques are used to investigate this instability further with the long-term perspective to suppress and control it. In this contribution, we give an overview about the different setups and the results achieved during the past years.
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- 2020
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26. Revealing the dynamics of ultrarelativistic non-equilibrium many-electron systems with phase space tomography
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Funkner, Stefan, Niehues, Gudrun, Nasse, Michael J., Bründermann, Erik, Caselle, Michele, Kehrer, Benjamin, Rota, Lorenzo, Schönfeldt, Patrik, Schuh, Marcel, Steffen, Bernd, Steinmann, Johannes L., Weber, Marc, and Müller, Anke-Susanne
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Accelerator Physics (physics.acc-ph) ,Multidisciplinary ,Physics - Instrumentation and Detectors ,Physics ,FOS: Physical sciences ,Pattern Formation and Solitons (nlin.PS) ,Instrumentation and Detectors (physics.ins-det) ,Nonlinear Sciences - Pattern Formation and Solitons ,Physics::Accelerator Physics ,ddc:530 ,Physics - Accelerator Physics ,ddc:600 ,Optics (physics.optics) ,Physics - Optics - Abstract
Scientific reports 13(1), 4618 (2023). doi:10.1038/s41598-023-31196-5, The description of physical processes with many-particle systems is a key approach to the modeling of numerous physical systems. For example in storage rings, where ultrarelativistic particles are agglomerated in dense bunches, the modeling and measurement of their phase-space distribution is of paramount importance: at any time the phase-space distribution not only determines the complete space-time evolution but also provides fundamental performance characteristics for storage ring operation. Here, we demonstrate a non-destructive tomographic imaging technique for the 2D longitudinal phase-space distribution of ultrarelativistic electron bunches. For this purpose, we utilize a unique setup, which streams turn-by-turn near-field measurements of bunch profiles at MHz repetition rates. To demonstrate the feasibility of our method, we induce a non-equilibrium state and show that the phase-space distribution microstructuring as well as the phase-space distribution dynamics can be observed in great detail. Our approach offers a pathway to control ultrashort bunches and supports, as one example, the development of compact accelerators with low energy footprints., Published by Macmillan Publishers Limited, part of Springer Nature, [London]
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- 2019
27. Synchrotron infrared microspectroscopy imaging using a multi-element detector (IRMSI-MED) for diffraction-limited chemical imaging
- Author
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Nasse, Michael J., Reininger, Ruben, Kubala, Tim, Janowski, Sebastian, and Hirschmugl, Carol
- Published
- 2007
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28. First Electron Beam at the Linear Accelerator FLUTE at KIT
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Nasse, Michael, Bernhard, Axel, Bründermann, Erik, Böhm, Andreas, Funkner, Stefan, Härer, Bastian, Križnar, Igor, Malygin, Anton, Marsching, Sebastian, Mexner, Wolfgang, Müller, Anke-Susanne, Niehues, Gudrun, Ruprecht, Robert, Schmelzer, Thiemo, Schuh, Marcel, Smale, Nigel, Wesolowski, Pawel, and Yan, Minjie
- Subjects
Technology ,MC2: Photon Sources and Electron Accelerators ,ddc:600 ,Accelerator Physics - Abstract
The first electron beams were generated in the 7 MeV section of the short-pulse linear accelerator test facility FLUTE (Ferninfrarot Linac- Und Test-Experiment) at the Karlsruhe Institute of Technology (KIT). In this contribution we show images of the electron beam on a YAG-screen (yttrium aluminum garnet) as well as signals from an integrating current transformer (ICT) and a Faraday cup. Furthermore, the progress of tuning the FLUTE electron bunches for experiments is presented., Proceedings of the 10th Int. Particle Accelerator Conf., IPAC2019, Melbourne, Australia
- Published
- 2019
29. Diagnostics and First Beam Measurements at FLUTE
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Schmelzer, Thiemo, Bernhard, Axel, Bründermann, Erik, Böhm, Andreas, Funkner, Stefan, Härer, Bastian, Križnar, Igor, Malygin, Anton, Marsching, Sebastian, Mexner, Wolfgang, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Ruprecht, Robert, Schuh, Marcel, Smale, Nigel, Wesolowski, Pawel, and Yan, Minjie
- Subjects
Technology ,Physics::Accelerator Physics ,ddc:600 ,Accelerator Physics ,MC6: Beam Instrumentation, Controls, Feedback and Operational Aspects - Abstract
FLUTE (Ferninfrarot Linac- Und Test-Experiment) is a compact versatile linear accelerator at the Karlsruhe Institute of Technology (KIT). It serves as a platform for a variety of accelerator studies as well as a source of strong ultra-short THz pulses for photon science. In the commissioning phase of the 7 MeV low energy section the electron bunches are used to test the different diagnostics systems installed in this section. An example is the split-ring-resonator-experiment. In this contribution we report on the commissioning status of the beam diagnostics and present first beam measurements at FLUTE., Proceedings of the 10th Int. Particle Accelerator Conf., IPAC2019, Melbourne, Australia
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- 2019
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30. Synchronous Measurements of Electron Bunches Under the Influence of the Microbunching Instability
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Brosi, Miriam, Boltz, Tobias, Bründermann, Erik, Funkner, Stefan, Kehrer, Benjamin, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Patil, Meghana, Schreiber, Patrick, Schönfeldt, Patrik, and Steinmann, Johannes
- Subjects
Technology ,MC5: Beam Dynamics and EM Fields ,Physics::Accelerator Physics ,ddc:600 ,Accelerator Physics - Abstract
The microbunching instability is a longitudinal collective instability which occurs for short electron bunches in a storage ring above a certain threshold current. The instability leads to a charge modulation in the longitudinal phase space. The resulting substructures on the longitudinal bunch profile vary over time and lead to fluctuations in the emitted power of coherent synchrotron radiation (CSR). To study the underlying longitudinal dynamics on a turn-by-turn basis, the KIT storage ring KARA (Karlsruhe Research Accelerator) provides a wide variety of diagnostic systems. By synchronizing the single-shot electro-optical spectral decoding setup (longitudinal profile), the bunch-by-bunch THz detection systems (THz power) and the horizontal bunch size measurement setup (energy spread), three important properties of the bunch during this instability can be measured at every turn for long time scales. This allows a deep insight into the dynamics of the bunch under the influence of the microbunching instability. This contribution will discuss effects like the connection between the emitted CSR power and the deformations in the longitudinal bunch profile on the time scale of the instability., Proceedings of the 10th Int. Particle Accelerator Conf., IPAC2019, Melbourne, Australia
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- 2019
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31. Single-shot longitudinal beam profile and terahertz diagnostics at MHz- Towards GHz-rates with high-throughput electronics
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Caselle, Michele, BORGHI, Balzer, Matthias, Boscardin, Maurizio, Brosi, Miriam, Bründermann, Erik, Funkner, Stefan, Kehrer, Benjamin, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Patil, Meghana, Ronchin, Sabina, Rota, Lorenzo, Schuh, Marcel, Schönfeldt, Patrik, Steinmann, Johannes, Weber, Marc, and Yan, Minjie
- Subjects
Physics::Instrumentation and Detectors ,Physics::Accelerator Physics ,4 Time-Resolved Diagnostics and Synchronization ,ddc:620 ,Engineering & allied operations ,Accelerator Physics - Abstract
Accelerators with high bunch-repetition rates mandate high-throughput detector electronics to diagnose each individual bunch. KALYPSO with a 256-pixel detector line-array integrated in an fs laser-based electro-optical set-up allows longitudinal bunch profiling with sub-ps resolution as demonstrated at the storage ring ANKA for single-bunch mode operation at 2.7 MHz and also at the Eu-XFEL with a 4.5-MHz micro-bunch train. Improvements will enhance fs-time accuracy, reduce noise, and increase frame-rate. A custom front-end with an application-specific integrated circuit (ASIC) has been developed to operate with 10-MHz frame-rates at low noise. Several linear arrays with up to 1024 pixel and smaller pixel pitch were submitted for production. The development of a low-gain avalanche diode (LGAD) sensor will further improve the time resolution. Detector data is transmitted in the DAQ framework to external GPU-based clusters and processed in real-time at 7 Gbytes/s with a few μs latency. For beam dynamics studies we also develop KAPTURE capable to analyze terahertz detector pulses at GHz-repetition rates. These developments open new windows in beam diagnostics of modern accelerators., Proceedings of the 6th Int. Beam Instrumentation Conf., IBIC2017, Grand Rapids, MI, USA
- Published
- 2018
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32. Status of the THz Streaking Experiment with Split Ring Resonators at FLUTE
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FLUTE Collaboration, Schlott, V., Dehler, M., Ischebeck, R., Moser, M., Feurer, T., Hayati, M., Ollmann, Z., Tarkeshian, R., Bründermann, Erik, Funkner, Stefan, Müller, Anke-Susanne, Nasse, Michael J., Niehues, Gudrun, Ruprecht, Robert, Schmelzer, Tobias, Schuh, Marcel, Schwarz, Markus, and Yan, Minjie
- Subjects
Technology ,4 Time-Resolved Diagnostics and Synchronization ,ddc:600 ,Accelerator Physics - Abstract
THz streaking with split ring resonators (SRR) promise ultra-high (sub-femtosecond) temporal resolution even for relativistic electron bunches. A proof-of-principle experiment in collaboration between the University of Bern, the Paul Scherrer Institute (PSI) and the Karlsruhe Institute of Technology (KIT) is currently prepared at the FLUTE facility (Ferninfrarot Linac und Test Experiment) at KIT. Most of the critical components have been designed, tested and set-up in the 7 MeV diagnostics part of FLUTE. In this contribution we will present an update on the experimental set-up and report on SRR configurations which have been optimized for highest THz deflection, while simultaneously accounting for the restrictions of the manufacturing process. Test measurements characterizing the SRR samples and the THz source, which has been matched to the FLUTE gun laser, will also be presented., Proceedings of the 6th Int. Beam Instrumentation Conf., IBIC2017, Grand Rapids, MI, USA
- Published
- 2018
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33. Turn-by-Turn Measurements for Systematic Investigations of the Micro-Bunching Instability
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Steinmann, Johannes, Brosi, Miriam, Bründermann, Erik, Caselle, Michele, Funkner, Stefan, Kehrer, Benjamin, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Rota, Lorenzo, Schuh, Marcel, Schönfeldt, Patrik, Siegel, Michael, and Weber, Marc
- Subjects
Physics ,Physics::Accelerator Physics ,ddc:530 ,D - Key Technologies ,Accelerator Physics - Abstract
While recent diffraction-limited storage rings provide bunches with transverse dimensions smaller than the wavelength of the observed synchrotron radiation, the bunch compression in the longitudinal plane is still challenging. The benefit would be single cycle pulses of coherent radiation with many orders of magnitude higher intensity. However, the self-interaction of a short electron bunch with its emitted coherent radiation can lead to micro-bunching instabilities. This effect limits the bunch compression in storage rings currently to the picosecond range. In that range, the bunches emit coherent THz radiation corresponding to their bunch length. In this paper, new measurement setups developed at the Karlsruhe Institute of Technology are described for systematic turn-by-turn investigations of the micro-bunching instability. They lead to a better understanding thereof and enable appropriate observation methods in future efforts of controlling and mastering the instability. Furthermore, the described setups might also be used as high repetition rate bunch compression monitors for bunches of picosecond length and below., Proceedings of the 60th ICFA Advanced Beam Dynamics Workshop on Future Light Sources, FLS2018, Shanghai, China
- Published
- 2018
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34. High Repetition Rate, Single-Shot Electro-Optical Monitoring of Longitudinal Electron Bunch Dynamics Using the Linear Array Detector KALYPSO
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Niehues, Gudrun, Blomley, Edmund, Brosi, Miriam, Bründermann, Erik, Caselle, Michele, Funkner, Stefan, Hiller, Nicole, Müller, Anke-Susanne, Nasse, Michael, Rota, Lorenzo, Schuh, Marcel, Schönfeldt, Patrik, and Weber, Marc
- Subjects
Physics ,T03 Beam Diagnostics and Instrumentation ,Physics::Accelerator Physics ,06 Beam Instrumentation, Controls, Feedback, and Operational Aspects ,ddc:530 ,Accelerator Physics - Abstract
High repetition rate diagnostics are required when detecting single-shot electro-optical (EO) bunch profiles. The KIT storage ring KARA (KArlsruhe Research Accelerator) is the first storage ring in the world that has a near-field EO bunch-profile monitor in operation. By imprinting longitudinal electron bunch profiles onto chirped laser pulses, single-shot detection is feasible. However, limitations of available detection systems are challenging: The constraints are either given by the repetition rate or the duration of the consecutive acquisitions. Two strategies can overcome these limitations: Based on the photonic time-stretch method, the ps laser pulses can be stretched to the ns range using km long fibers. The readout with a high-bandwidth oscilloscope then enables a single-shot detection at high repetition rates. The other strategy is the development of dedicated ultra-fast photodetector arrays allowing direct detection of the ps pulses at MHz repetition rates. We developed KALYPSO, a linear detector array with a DAQ allowing to record high data-rates over long time scales. Here, we present recent results of studies of the longitudinal electron bunch dynamics using KALYPSO., Proceedings of the 9th Int. Particle Accelerator Conf., IPAC2018, Vancouver, BC, Canada
- Published
- 2018
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35. Commissioning Status of FLUTE
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Malygin, Anton, Bernhard, Axel, Bründermann, Erik, Böhm, Andreas, Funkner, Stefan, Križnar, Igor, Marsching, Sebastian, Mexner, Wolfgang, Mochihashi, Akira, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Ruprecht, Robert, Schmelzer, Thiemo, Schuh, Marcel, Schwarz, Markus, Smale, Nigel, Wesolowski, Pawel, and Yan, Minjie
- Subjects
02 Photon Sources and Electron Accelerators ,A08 Linear Accelerators ,Accelerator Physics - Abstract
FLUTE (Ferninfrarot Linac- Und Test-Experiment) will be a new compact versatile linear accelerator at the KIT. Its primary goal is to serve as a platform for a variety of accelerator studies as well as to generate strong ultra-short THz pulses for photon science. The phase I of the project, which includes the RF photo injector providing electrons at beam energy of 7 MeV and a corresponding diagnostics section, is currently being commissioned. In this contribution, we report on the latest progress of the commissioning phase. The status of the gun conditioning will be given, followed by an overview of the RF system and the laser system., Proceedings of the 9th Int. Particle Accelerator Conf., IPAC2018, Vancouver, BC, Canada
- Published
- 2018
- Full Text
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36. FLUTE Diagnostics Integration
- Author
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Yan, Minjie, Bernhard, Axel, Bründermann, Erik, Funkner, Stefan, Križnar, Igor, Malygin, Anton, Marsching, Sebastian, Mexner, Wolfgang, Mochihashi, Akira, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Ruprecht, Robert, Schmelzer, Thiemo, Schuh, Marcel, Smale, Nigel, Wesolowski, Pawel, and Wüstling, Sascha
- Subjects
Physics ,T03 Beam Diagnostics and Instrumentation ,Physics::Accelerator Physics ,06 Beam Instrumentation, Controls, Feedback, and Operational Aspects ,ddc:530 ,Accelerator Physics - Abstract
FLUTE (Ferninfrarot Linac- Und Test-Experiment) will be a new compact versatile linear accelerator at KIT. Its primary goal is to serve as a platform for a variety of accelerator studies as well as to generate strong ultra-short THz pulses for photon science. The machine consists of an RF gun, a traveling wave linac and a D-shaped bunch compressor chicane with corresponding diagnostics sections. In this contribution, we report on the latest developments of the diagnostics components. An overview of the readout and control system integration will be given., Proceedings of the 9th Int. Particle Accelerator Conf., IPAC2018, Vancouver, BC, Canada
- Published
- 2018
37. Implementation of Ultra-Low Frequency Non-Linear Raman Spectroscopy with the Gun Laser at FLUTE
- Author
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Funkner, Stefan, Bründermann, Erik, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, Schmelzer, Thiemo, Steinmann, Johannes, Tani, Masahiko, and Yan, Minjie
- Subjects
Physics::Popular Physics ,Physics ,Physics::Optics ,ddc:530 ,02 Photon Sources and Electron Accelerators ,Accelerator Physics ,T25 Lasers - Abstract
At the Karlsruhe Institute of Technology (KIT) the new compact versatile linear accelerator FLUTE is currently under commissioning. This accelerator will provide intense broadband THz pulses for spectroscopic experiments. Here, we demonstrate the implementation of a coherent Raman spectrometer using the RF gun laser of FLUTE. With our experiment, we can measure the Raman spectrum at ultra-low frequencies. The measurement principle, which was recently published, is based on coherent nonlinear excitation of the observed sample. The spectrometer consists of a stretcher and an interferometer, which can be simply built from standard optics. We will show that the accessible spectral range overlaps well with that from the THz pulses of the planned FLUTE experiment. Thus, the coherent Raman experiment can provide spectral information complementary to absorption spectral measurements using the THz radiation of FLUTE., Proceedings of the 9th Int. Particle Accelerator Conf., IPAC2018, Vancouver, BC, Canada
- Published
- 2018
- Full Text
- View/download PDF
38. Time-resolved energy spread studies at the ANKA storage ring
- Author
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Kehrer, Benjamin, Blomley, Edmund, Brosi, Miriam, Bründermann, Erik, Hiller, Nicole, Müller, Anke-Susanne, Nasse, Michael, Schedler, Manuel, Schuh, Marcel, Schwarz, Markus, SchöNfeldt, Patrik, Schütze, Paul, Smale, Nigel, and Steinmann, Johannes
- Subjects
radiation ,Technology ,detector ,storage-ring ,synchrotron ,timing ,Physics::Accelerator Physics ,06 Beam Instrumentation, Controls, Feedback and Operational Aspects ,ddc:600 ,Accelerator Physics - Abstract
Recently, a new setup for measuring the beam energy spread has been commissioned at the ANKA storage ring at the Karlsruhe Institute of Technology. This setup is based on a fast-gated intensified camera and detects the horizontal profiles of individual bunches in a multi-bunch environment on a single-turn base. As the radiation source point is located in a dispersive section of the storage ring, this allows time-resolved studies of the energy spread. These studies are of particular interest in the framework of short-bunch beam dynamics and the characterization of instabilities. The system is fully synchronized to other beam diagnostics devices allocated in various places along the storage ring, such as the single-shot electro-optical spectral decoding setup or the turn-by-turn terahertz detection systems. Here we discuss the results of the synchronous measurements with the various systems with special emphasis on the energy spread studies., Proceedings of the 8th Int. Particle Accelerator Conf., IPAC2017, Copenhagen, Denmark
- Published
- 2017
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39. Ultra-fast Detector for wide range spectral measurements.
- Author
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Caselle, M., Bründermann, E., Düsterer, S., Funkner, S., Gerth, C., Haack, D., Kopmann, A., Patil, M. Mahaveer, Makowski, D., Mielzcarek, A., Nasse, Michael, Niehues, G., Rota, Lorenzo, Steffen, B., Wang, W., Balzer, M. Norbert, Weber, M., Müller, A. S., and Bielawski, S.
- Published
- 2018
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- View/download PDF
40. Single-shot photon and electric field diagnostics using the linear array detector KALYPSO with MHz-range readout.
- Author
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Niehues, Gudrun, Blomley, Edmund, Bründermann, Erik, Caselle, Michele, Funkner, Stefan, Kehrer, Benjamin, Nasse, Michael J., Patil, Meghana, Rota, Lorenzo, Schuh, Marcel, Weber, Marc, and Müller, Anke-Susanne
- Published
- 2018
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- View/download PDF
41. KALYPSO: A Mfps Linear Array Detector for Visible to NIR Radiation
- Author
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Rota, Lorenzo, Balzer, Matthias, Caselle, Michele, Gerth, Christopher, Hiller, Nicole, Makowski, Dariusz, Mielczarek, Aleksander, Mozzanica, Aldo, Müller, Anke-Susanne, Nasse, Michael, Niehues, Gudrun, SchöNfeldt, Patrik, Steffen, Bernd, and Weber, Marc
- Subjects
Physics::Instrumentation and Detectors ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Charge Monitors and Other Instruments ,Accelerator Physics - Abstract
The acquisition rate of commercially available line array detectors is a bottleneck for beam diagnostics at high-repetition rate machines like synchrotron lightsources or FELs with a quasi-continuous or macro-pulse operation. In order to remove this bottleneck we have developed KALYPSO, an ultra-fast linear array detector operating at a frame-rate of up to 2.7 Mfps. The KALYPSO detector mounts InGaAs or Si linear array sensors to measure radiation in the near-infrared or visible spectrum. The FPGA-based read-out card can be connected to an external data acquisition system through a high-performance PCI-Express 3.0 data-link, allowing continuous data taking and real-time data analysis. The detector is fully synchronized with the timing system of the accelerator and other diagnostic instruments. The detector is currently installed at several accelerators: ANKA, the European XFEL and TELBE. We present the detector and the results obtained with Electro-Optical Spectral Decoding (EOSD) setups., Proceedings of the 5th Int. Beam Instrumentation Conf., IBIC2016, Barcelona, Spain
- Published
- 2016
- Full Text
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42. Simultaneous Detection of Longitudinal and Transverse Bunch Signals at ANKA
- Author
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Kehrer, Benjamin, Blomley, Edmund, Brosi, Miriam, Bründermann, Erik, Hiller, Nicole, Müller, Anke-Susanne, Nasse, Michael, Schedler, Manuel, Schuh, Marcel, Schönfeldt, Patrik, Schütze, Paul, Smale, Nigel, and Steinmann, Johannes
- Subjects
Physics::Accelerator Physics ,06 Beam Instrumentation, Controls, Feedback and Operational Aspects ,Accelerator Physics - Abstract
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., Proceedings of the 7th Int. Particle Accelerator Conf., IPAC2016, Busan, Korea
- Published
- 2016
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- View/download PDF
43. Optimization of THz Radiation Pulses at FLUTE
- Author
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Yan, Minjie, Müller, Anke-Susanne, Nasse, Michael, Schuh, Marcel, and Schwarz, Markus
- Subjects
05 Beam Dynamics and Electromagnetic Fields ,Physics::Optics ,Physics::Accelerator Physics ,Accelerator Physics - Abstract
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., Proceedings of the 7th Int. Particle Accelerator Conf., IPAC2016, Busan, Korea
- Published
- 2016
- Full Text
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44. First Results of Energy Measurements with a Compact Compton Backscattering Setup at ANKA
- Author
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Chang, Cheng, Bründermann, Erik, Hertle, Edmund, Hiller, Nicole, Hübers, Heinz-Wilhelm, Huttel, Erhard, Müller, Anke-Susanne, Nasse, Michael, Richter, Heiko, Schuh, Marcel, and Steinmann, Johannes
- Subjects
Physics::Accelerator Physics ,6: Beam Instrumentation, Controls, Feedback, and Operational Aspects ,Accelerator Physics - Abstract
An electron energy measurement setup based on the detection of Compton backscattered photons, generated by laser light scattered off the relativistic electron beam, has been proposed and developed for operation at the ANKA storage ring of the Karlsruhe Institute of Technology (KIT). In contrast to conventional methods based on head-on collisions, the setup at ANKA is, for the first time, realized in a transverse configuration where the laser beam hits the electron beam at an angle of ~90°. This makes it possible to achieve a relatively low-cost and very compact setup since it only requires a small side-port instead of a straight section. This development could benefit storage rings with restricted space or where no straight sections are available, for example due to interferences with existing beamlines. The setup and the first measurement results are presented in the paper., Proceedings of the 6th Int. Particle Accelerator Conf., IPAC2015, Richmond, VA, USA
- Published
- 2015
- Full Text
- View/download PDF
45. Magnet Studies for the Accelerator FLUTE at KIT
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Hillenbrand, Steffen, Bernhard, Axel, Müller, Anke-Susanne, Nasse, Michael, Rossmanith, Robert, Ruprecht, Robert, Sauter, Martin, Schott, Steffen, Schuh, Marcel, Schulz, Sebastian, Weber, Manuel, Wesolowski, Pawel, and Widmann, Christina
- Subjects
Physics::Accelerator Physics ,7: Accelerator Technology ,Accelerator Physics - Abstract
At KIT we are currently constructing the compact linear accelerator FLUTE (Ferninfrarot Linac Und Test Experiment). This 41 MeV machine is aimed at accelerator physics and synchrotron radiation research, using ultra-short electron bunches. The electrons are generated at a photo-cathode using picosecond long UV laser pulses. A magnetic chicane is used to compress the bunches longitudinally to a few femtoseconds. This contribution describes both the magnet design, in particular the optimization of the chicane dipoles based on finite element method (FEM) simulations, as well as the implementation of a magnet measurement system., Proceedings of the 6th Int. Particle Accelerator Conf., IPAC2015, Richmond, VA, USA
- Published
- 2015
- Full Text
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46. Status of the Accelerator Physics Test Facility FLUTE
- Author
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Nasse, Michael, Aßmann, Ralph, Bernhard, Axel, Birkel, Ingrid, Borysenko, Andrii, Böhm, Andreas, Felber, Matthias, Flöttmann, Klaus, Gerth, Christopher, Hillenbrand, Steffen, Hiller, Nicole, Hoffmann, Matthias, Höninger, Stephan, Ischebeck, Rasmus, Keil, Boris, Marsching, Sebastian, Müller, Anke-Susanne, Peier, Peter, Rossmanith, Robert, Ruprecht, Robert, Schlarb, Holger, Schlott, Volker, Schuh, Marcel, Schwarz, Markus, Smit, Bennie, Steffen, Bernd, Stingelin, Lukas, Walther, Sophie, Weber, Manuel, and Wesolowski, Pawel
- Subjects
Physics::Accelerator Physics ,2: Photon Sources and Electron Accelerators ,Accelerator Physics - Abstract
A new compact versatile linear accelerator named FLUTE (Ferninfrarot Linac Und Test Experiment) is currently under construction at the Karlsruhe Institute of Technology (KIT). It will serve as an accelerator test facility and allow conducting a variety of accelerator physics studies. In addition, it will be used to generate intense, ultra-short THz pulses for photon science experiments. FLUTE consists of a ~7 MeV photo-injector gun, a ~41 MeV S-band linac and a D-shaped chicane to compress bunches to a few femtoseconds. This contribution presents an overview of the project status and the accompanying simulation studies., Proceedings of the 6th Int. Particle Accelerator Conf., IPAC2015, Richmond, VA, USA
- Published
- 2015
- Full Text
- View/download PDF
47. Estimating and correcting interference fringes in infrared spectra in infrared hyperspectral imaging.
- Author
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Azarfar, Ghazal, Aboualizadeh, Ebrahim, Walter, Nicholas M., Ratti, Simona, Olivieri, Camilla, Norici, Alessandra, Nasse, Michael, Kohler, Achim, Giordano, Mario, and Hirschmugl, Carol J.
- Subjects
FOURIER transform infrared spectroscopy ,REFRACTIVE index ,WAVELENGTHS - Abstract
Short-term acclimation response of individual cells of Thalassiosira weissflogii was monitored by Synchrotron FTIR imaging over the span of 75 minutes. The cells, collected from batch cultures, were maintained in a constant flow of medium, at an irradiance of 120 μmol m
−2 s−1 and at 20 °C. Multiple internal reflections due to the micro fluidic channel were modeled, and showed that fringes are additive sinusoids to the pure absorption of the other components of the system. Preprocessing of the hyperspectral cube (x, y, Abs(λ)) included removing spectral fringe using an EMSC approach. Principal component analysis of the time series of hyperspectral cubes showed macromolecular pool variations (carbohydrates, lipids and DNA/RNA) of less than 2% after fringe correction. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
48. Status of FLUTE
- Author
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Schuh, Marcel, Aßmann, Ralph, Birkel, Ingrid, Borysenko, Andrii, Braun, Hans-Heinrich, Böhm, Andreas, Felber, Matthias, Flöttmann, Klaus, Ganter, Romain, Hiller, Nicole, Hoffmann, Matthias, Huttel, Erhard, Höninger, Stephan, Judin, Vitali, Marsching, Sebastian, Müller, Anke-Susanne, Naknaimueang, Somprasong, Nasse, Michael, Rossmanith, Robert, Ruprecht, Robert, Schlarb, Holger, Schlott, Volker, Schwarz, Markus, Stingelin, Lukas, Weber, Manuel, and Wesolowski, Pawel
- Subjects
Physics::Accelerator Physics ,A05 Synchrotron Radiation Facilities ,02 Synchrotron Light Sources and FELs ,Accelerator Physics - Abstract
FLUTE, a new linac-based test facility and THz source is currently being built at the Karlsruhe Institute of Technology (KIT) in collaboration with DESY and PSI. It consists of an RF photo gun and a traveling wave linac accelerating electrons to beam energies of ~41 MeV in the charge range from a few pC up to 3 nC. The electron bunch will then be compressed in a magnetic chicane in the range of 1 - 300 fs, depending on the charge, in order to generate coherent THz radiation with high peak power. An overview of the simulation and hardware status is given in this contribution., Proceedings of the 5th Int. Particle Accelerator Conf., IPAC2014, Dresden, Germany
- Published
- 2014
49. Design of a compact setup to measure beam energy by detection of Compton backscattered photons at ANKA
- Author
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Chang, Cheng, Batchelor, David, Hertle, Edmund, Huttel, Erhard, Judin, Vitali, Müller, Anke-Susanne, Nasse, Michael, Schuh, Marcel, and Steinmann, Johannes
- Subjects
T03 Beam Diagnostics and Instrumentation ,ddc:620 ,Nuclear Experiment ,Engineering & allied operations ,Accelerator Physics ,06 Instrumentation, Controls, Feedback & Operational Aspects - Abstract
One of the most important parameters of accelerators is their beam energy. So far, the method of resonant depolarization was used to accurately determine the energy at 2.5 GeV of the ANKA electron storage ring, which, however, becomes cumbersome for lower energies. A good alternative is the detection of Compton backscattered photons, generated by laser light scattered off the relativistic electron beam. To achieve compactness and integration into the storage ring, the setup of transverse scattering is proposed instead of conventional head-on collision. The feasibility has been studied by comparison between simulations of Compton backscattered photons by AT and CAIN 2.35 and actual measurement of background radiation with an HPGe (High Purity Germanium) spectrometer. The layout of the setup is also included in the paper., Proceedings of the 5th Int. Particle Accelerator Conf., IPAC2014, Dresden, Germany
- Published
- 2014
- Full Text
- View/download PDF
50. Electro-optical Bunch Length Monitor for FLUTE: Layout and Simulations
- Author
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Borysenko, Andrii, Hertle, Edmund, Hiller, Nicole, Judin, Vitali, Kehrer, Benjamin, Marsching, Sebastian, Müller, Anke-Susanne, Nasse, Michael, Rossmanith, Robert, Ruprecht, Robert, Schuh, Marcel, Schwarz, Markus, Steffen, Bernd, and Wesolowski, Pawel
- Subjects
010308 nuclear & particles physics ,01 natural sciences ,030218 nuclear medicine & medical imaging ,Accelerator Physics ,06 Instrumentation, Controls, Feedback & Operational Aspects ,03 medical and health sciences ,0302 clinical medicine ,0103 physical sciences ,T03 Beam Diagnostics and Instrumentation ,Physics::Accelerator Physics ,ddc:620 ,Engineering & allied operations - Abstract
A new compact linear accelerator FLUTE is currently under construction at Karlsruhe Institute of Technology (KIT) in collaboration with DESY and PSI. It aims at obtaining femtosecond electron bunches (~1fs - 300 fs) with a wide charge range (1 pC - 3 nC) and requires a precise bunch length diagnostic system. Here we present the layout of a bunch length monitor based on the electro-optic technique of spectral decoding using an Yb-doped fiber laser system (central wavelength 1030 nm) and a GaP crystal. Simulations of the electro-optic signal for different operation modes of FLUTE were performed and main challenges are discussed in this talk. This work is funded by the European Union under contract PITN-GA-2011-289191, Proceedings of the 5th Int. Particle Accelerator Conf., IPAC2014, Dresden, Germany
- Published
- 2014
- Full Text
- View/download PDF
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