KALYPSO: Linear array detector for high-repetition rate and real-time beam diagnostics

Rota, Lorenzo; Caselle, M.; Bründermann, Erik; Funkner, Stefan; Gerth, Ch.; Kehrer, Benjamin; Mielczarek, Aleksander; Makowski, Dariusz; Mozzanica, A.; Müller, Anke-Susanne; Nasse, Michael; Niehues, Gudrun; Patil, Meghana; Schmitt, B.; Schönfeldt, Patrik; Steffen, B.; Weber, M.

doi:10.1016/j.nima.2018.10.093

Cited by 20 publications

(18 citation statements)

References 7 publications

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“…III B), novel laser synchronization scheme (Sec. III C), and spectrometer with the KArlsruhe Linear arraY detector for MHz rePetition rate SpectrOscopy (KALYPSO) 26 (Sec. III D).…”

Section: Please Cite This Article As Doi:101063/15142833mentioning

confidence: 99%

“…The spectrometer is built from standard, commercially available optics and housed in a 19 " chassis with 3 RU. A fiber-coupled collimator illuminates a 2 " grating with 600 lines/mm, and the first order of the diffracted light is focused by two cylindrical lenses onto the InGaAs microstrip sensor of the linear array detector KALYPSO, 26 which has been designed for EOSD at EuXFEL and the storage ring of the Karlsruhe Research Accelerator (KARA) 13 with continuous data read-out at frame rates of up to 2.7 MHz.…”

Section: Grating Spectrometer With Mhz Linear Array Detector Kalypsomentioning

confidence: 99%

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Compact single-shot electro-optic detection system for THz pulses with femtosecond time resolution at MHz repetition rates

Steffen

Gerth

Caselle

et al. 2020

Review of Scientific Instruments

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Electro-optical detection has proven to be a valuable technique to study temporal profiles of THz pulses with pulse durations down to femtoseconds. As the Coulomb field around a relativistic electron bunch resembles the current profile, electro-optical detection can be exploited for non-invasive bunch length measurements at accelerators. We have developed a very compact and robust electro-optical detection system based on spectral decoding for single-shot longitudinal bunch profile monitoring at the European X-ray free electron laser (XFEL) for electron bunch lengths down to 200 fs (rms). Apart from the GaP crystal and the corresponding laser optics at the electron beamline, all components are housed in 19 " chassis for rack mount and remote operation inside the accelerator tunnel. An advanced laser synchronization scheme based on radio-frequency down-conversion has been developed for locking a custom-made Yb-fiber laser to the radio-frequency of the European XFEL accelerator. In order to cope with the high bunch repetition rate of the superconducting accelerator, a novel linear array detector has been employed for spectral measurements of the Yb-fiber laser pulses at frame rates of up to 2.26 MHz. In this paper, we describe all sub-systems of the electrooptical detection system as well as the measurement procedure in detail, and discuss first measurement results of longitudinal bunch profiles of around 400 fs (rms) with an arrival-time jitter of 35 fs (rms).

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“…III B), novel laser synchronization scheme (Sec. III C), and spectrometer with the KArlsruhe Linear arraY detector for MHz rePetition rate SpectrOscopy (KALYPSO) 26 (Sec. III D).…”

Section: Please Cite This Article As Doi:101063/15142833mentioning

confidence: 99%

Section: Grating Spectrometer With Mhz Linear Array Detector Kalypsomentioning

confidence: 99%

Compact single-shot electro-optic detection system for THz pulses with femtosecond time resolution at MHz repetition rates

Steffen

Gerth

Caselle

et al. 2020

Review of Scientific Instruments

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“…The probe laser is reflected on a Gallium Phosphide (GaP) crystal back side. The spectrum readout is performed using a KALYPSO linear array camera operating at 1.13 MHz line rate 51 , 52 . Details of laser transport and KALYPSO focusing optics are not shown—see ref.…”

Section: Resultsmentioning

confidence: 99%

“…The spectra are recorded in single-shot, using a grating spectrometer based on the KALYPSO fast linear array detector 51 , 52 operated at a line rate of 1.13 MHz. A first series of electron bunch trains for one polarization is recorded and then the last half-wave plate before the polarizing beam splitter is rotated by π /8 to record the complementary polarization.…”

Section: Methodsmentioning

confidence: 99%

Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

et al. 2022

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Recording electric field evolution in single-shot with THz bandwidth is needed in science including spectroscopy, plasmas, biology, chemistry, Free-Electron Lasers, accelerators, and material inspection. However, the potential application range depends on the possibility to achieve sub-picosecond resolution over a long time window, which is a largely open problem for single-shot techniques. To solve this problem, we present a new conceptual approach for the so-called spectral decoding technique, where a chirped laser pulse interacts with a THz signal in a Pockels crystal, and is analyzed using a grating optical spectrum analyzer. By borrowing mathematical concepts from photonic time stretch theory and radio-frequency communication, we deduce a novel dual-output electro-optic sampling system, for which the input THz signal can be numerically retrieved—with unprecedented resolution—using the so-called phase diversity technique. We show numerically and experimentally that this approach enables the recording of THz waveforms in single-shot over much longer durations and/or higher bandwidth than previous spectral decoding techniques. We present and test the proposed DEOS (Diversity Electro-Optic Sampling) design for recording 1.5 THz bandwidth THz pulses, over 20 ps duration, in single-shot. Then we demonstrate the potential of DEOS in accelerator physics by recording, in two successive shots, the shape of 200 fs RMS relativistic electron bunches at European X-FEL, over 10 ps recording windows. The designs presented here can be used directly for accelerator diagnostics, characterization of THz sources, and single-shot Time-Domain Spectroscopy.

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“…At KARA, we have been exploring two directions in parallel. We have been developing a new generation of fast linear cameras (KALYPSO) with multi-MHz acquisition rates [44][45][46][47]. In parallel, we have been developing a second direction consisting in using the so-called photonic time-stretch strategy [35,36].…”

Section: Experimental Strategymentioning

confidence: 99%

From self-organization in relativistic electron bunches to coherent synchrotron light: observation using a photonic time-stretch digitizer

Bielawski¹,

Blomley²,

Brosi³

et al. 2019

Sci Rep

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In recent and future synchrotron radiation facilities, relativistic electron bunches with increasingly high charge density are needed for producing brilliant light at various wavelengths, from X-rays to terahertz. In such conditions, interaction of electron bunches with their own emitted electromagnetic fields leads to instabilities and spontaneous formation of complex spatial structures. Understanding these instabilities is therefore key in most electron accelerators. However, investigations suffer from the lack of non-destructive recording tools for electron bunch shapes. In storage rings, most studies thus focus on the resulting emitted radiation. Here, we present measurements of the electric field in the immediate vicinity of the electron bunch in a storage ring, over many turns. For recording the ultrafast electric field, we designed a photonic time-stretch analog-to-digital converter with terasamples/second acquisition rate. We could thus observe the predicted link between spontaneous pattern formation and giant bursts of coherent synchrotron radiation in a storage ring.

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KALYPSO: Linear array detector for high-repetition rate and real-time beam diagnostics

Cited by 20 publications

References 7 publications

Compact single-shot electro-optic detection system for THz pulses with femtosecond time resolution at MHz repetition rates

Compact single-shot electro-optic detection system for THz pulses with femtosecond time resolution at MHz repetition rates

Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

From self-organization in relativistic electron bunches to coherent synchrotron light: observation using a photonic time-stretch digitizer

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