An ultra-fast digitizer with picosecond sampling time for Coherent Synchrotron Radiation

Caselle, M.; Brosi, Miriam; Chilingaryan, S.; Dritschler, T.; Judin, V.; Kopmann, A.; Mueller, A.; Raasch, J.; Smale, N.; Steinmann, Johannes; Vogelgesang, Matthias; Wuensch, S.; Siegel, M.; Weber, M.

doi:10.1109/rtc.2014.7097535

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…II). The detector signals were simultaneously read out with KAPTURE 's four input channels [29][30][31].…”

Section: Measurement Setupmentioning

confidence: 99%

“…In our setup, we use wire grids as broadband beam splitters and a KIT in-house developed readout system, providing synchronized data of the pulse amplitudes of each detector. Additionally, this KAPTURE readout system [29][30][31] provides continuous streaming of bunch-by-bunch, turn-byturn, and single-shot data. One major step towards understanding the dynamics in micro-bunching instability would be the reconstruction of the longitudinal phase space density from measured data.…”

Section: Introductionmentioning

confidence: 99%

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Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability

Steinmann

Boltz

Brosi

et al. 2018

Phys. Rev. Accel. Beams

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Electron accelerators and synchrotrons can be operated to provide short emission pulses due to longitudinally compressed or sub-structured electron bunches. Above a threshold current, the high charge density leads to the micro-bunching instability and the formation of sub-structures on the bunch shape. These time-varying sub-structures on bunches of picoseconds-long duration lead to bursts of coherent synchrotron radiation in the terahertz frequency range. Therefore, the spectral information in this range contains valuable information about the bunch length, shape and substructures. Based on the KAPTURE readout system, a 4-channel single-shot THz spectrometer capable of recording 500 million spectra per second and streaming readout is presented. First measurements of time-resolved spectra are compared to simulation results of the Inovesa Vlasov-Fokker-Planck solver. The presented results lead to a better understanding of the bursting dynamics especially above the micro-bunching instability threshold.

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“…II). The detector signals were simultaneously read out with KAPTURE 's four input channels [29][30][31].…”

Section: Measurement Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability

Steinmann

Boltz

Brosi

et al. 2018

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

show abstract

“…We use commercially available room temperature zero-bias Schottky diode detectors with different sensitivity ranges [11,12]. To read out these detectors we use the data acquisition (DAQ) system KAPTURE [27,28]. KAPTURE is a fast FPGA-based system with four input channels that can be used to sample the signal of one detector with four sample points per bunch and turn.…”

Section: Coherent Synchrotron Radiationmentioning

confidence: 99%

Synchronous detection of longitudinal and transverse bunch signals at a storage ring

Kehrer

Brosi

Steinmann

et al. 2018

Phys. Rev. Accel. Beams

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To understand and control dynamics in the longitudinal phase space, time-resolved measurements of different bunch parameters are required. For a reconstruction of this phase space, the detector systems have to be synchronized. This reconstruction can be used for example for studies of the micro-bunching instability which occurs if the interaction of the bunch with its own radiation leads to the formation of sub-structures on the longitudinal bunch profile. These sub-structures can grow rapidly -leading to a sawtooth-like behaviour of the bunch. At KARA, we use a fast-gated intensified camera for energy spread studies, Schottky diodes for coherent synchrotron radiation studies as well as electro-optical spectral decoding for longitudinal bunch profile measurements. For a synchronization, a synchronization scheme is used which compensates for hardware delays. In this paper, the different experimental setups and their synchronization are discussed and first results of synchronous measurements presented. *

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Turn-by-Turn Measurements for Systematic Investigations of the Micro-Bunching Instability

Steinmann¹,

Brosi²,

Bründermann³

et al. 2018

Proceedings of the 60th ICFA Advanced Beam Dynamics Workshop on Future Light Sources

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An ultra-fast digitizer with picosecond sampling time for Coherent Synchrotron Radiation

Cited by 3 publications

References 4 publications

Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability

Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability

Synchronous detection of longitudinal and transverse bunch signals at a storage ring

Turn-by-Turn Measurements for Systematic Investigations of the Micro-Bunching Instability

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