Mr
Johannes Zink
(DESY)
16/10/2019, 17:02
Poster: Diagnostics
Poster
The rapid development in the field of digitizers is leading to Analog-to-Digital Converters (ADC) with ever higher sampling rates. Nowadays many high-speed digitizers for RF applications and radio communication are available which can sample broadband signals without the need of down converters. These ADCs fit perfectly into beam instrumentation and diagnostic applications like Bunch Arrival...
Dr
Xiangkun LI
(DESY Zeuthen)
17/10/2019, 10:45
Poster: Beam Dynamics
A continuous wave (CW) mode operation of the European XFEL is under studies for a future upgrade. A superconducting RF (SRF) CW gun is under experimental development at DESY in Hamburg. Beam dynamics simulations for this setup have been done assuming 100 pC bunch charge and a maximum electric field at the photocathode of 30-40 MV/m. Experimental studies for these parameters using a normal...
Carsten Mai
(DELTA - TU Dortmund)
17/10/2019, 10:45
Poster: Beam Dynamics
At DELTA, a 1.5-GeV electron storage ring operated as a synchrotron light source by the TU Dortmund University, a dedicated beamline is used for experiments with (sub-)THz radiation. Here, an interaction of short laser pulses with electron bunches gives rise to coherently emitted broadband as well as tunable narrowband radiation from 75 GHz to 5.6 THz. For the narrowband operation of the...
Dr
Florian Burkart
(DESY)
17/10/2019, 10:45
Poster: Beam Dynamics
The ARES linac (Accelerator Research Experiment at DESY) setup hosts a normal conducting RF photoinjector generating a low charge electron beam that is afterwards accelerated by an S-band linac section. The linac as well as a magnetic chicane allow the production of ultrashort pulses with an excellent arrival-time stability.
The electron beam has then the potential to serve as a test beam...
Mr
Stephan Kötter
(Zentrum für Synchrotronstrahlung (DELTA), TU Dortmund University)
17/10/2019, 10:47
Poster: Beam Dynamics
At DELTA, a 1.5-GeV electron storage ring operated by the TU Dortmund University, preliminary tests of an online orbit-response-matrix model were conducted. Closed orbit perturbations corrected by the slow orbit feedback can be buffered and used to update a fit of the bilinear-exponential model with dispersion (BE+d model). This model is a representation of the orbit-response matrix depending...
Nils Lockmann
(DESY)
17/10/2019, 10:49
Poster: Beam Dynamics
At the European X-ray Free-Electron Laser, the spectral intensity of coherent diffraction radiation emitted at a screen with an aperture is monitored by a single-shot THz spectrometer. The spectrometer covers the range from 0.7-60 THz, which enables longitudinal form factor measurements of the electron bunch at the final compression stage. Iterative phase retrieval algorithm are used to obtain...
Weijia Wang
(Karlsruhe Institute of Technology (KIT))
17/10/2019, 10:51
Poster: Beam Dynamics
The KIT (Karlsruhe Institute of Technology) storage ring KARA (Karlsruhe Research Accelerator) aims at the stabilization of the emitted THz radiation to tackle the problem
of micro-bunching instability. A reinforcement learning based method are planed to be implemented through a RF feedback system located at storage ring. IPE (Institute of Data Processing and Electronics) developed a...
Dr
Aradhana Choudhuri
(DESY)
17/10/2019, 10:57
Poster: Beam Dynamics
We present the design, performance and long-term stability of the hybrid Yb:fiber, Nd:YVO4 laser used to generate electrons from the RF photocathode gun at the European XFEL facility. The laser provides deep UV output pulses in 600µs long bursts with variable internal repetition rate ranging from 564kHz to 1.1285MHz up to 4.5MHz. Due to its robust laser architecture, comprised of a mode-locked...
Dr
Aradhana Choudhuri
(DESY)
17/10/2019, 10:59
Poster: Beam Dynamics
The photocathode laser plays an important role for X-ray Free Electron Laser (XFEL) operation since the generated electron clouds at the gun determine many of the X-ray parameters. Its energy and pointing stability is a pre-requisite for stable X-ray pulse trains. The XUV FEL FLASH at DESY runs in burst-mode, where XUV pulses are emitted in 800 µs long bursts with up to 1MHz intra-burst...
Ms
Meghana Mahaveer Patil
(KIT)
17/10/2019, 16:02
Poster: Controls/Seeding/DAQ
The photon science research at accelerators is influenced radically by the developments of sensor and readout technologies for imaging. It covers a wide range of applications fields both beam diagnostic and user systems, tomography and spectroscopy, etc. The repetition rate of commercially available linear array detectors is a limitation factor for the emerging synchrotron applications. To...
Mr
Jan Marjanovic
(DESY)
17/10/2019, 16:04
Poster: Controls/Seeding/DAQ
The ecosystem of FMC/FMC+ carriers in MicroTCA (Advanced Mezzanine Card form
factor) is very diverse. The requirements for such a board are very demanding,
and sometimes even opposing to each other. The definition of a set of
requirements that will satisfy most of the use cases is a challenging task.
Presented here is the DAMC-FMC2ZUP, a modern and high-performance FMC+ carrier
in AMC...
Mr
Mohammed bawatna
(HZDR)
17/10/2019, 16:06
Speed talks: Controls/Seeding/DAQ
The superradiant THz sources at TELBE facility is based on the new class of accelerator-driven terahertz (THz) radiation sources that provide high repetition rates up to 13 MHz, and flexibility of tuning the THz pulse form. The THz pulses are used for the excitation of materials of interest, about two orders of magnitude higher than state-of-the-art tabletop sources. Time-resolved experiments...
Andreas Schwarz
(Helmholtz-Zentrum Dresden-Rossendorf, radiation source ELBE)
17/10/2019, 16:08
Poster: Controls/Seeding/DAQ
- Overview of the Optical and Control Setup of the pulsed optical synchronization system at ELBE
- Results of performance measurements of the system done in 2019
- Actual Goals and Challenges
Mr
Andreas Ebersoldt
(KIT)
17/10/2019, 16:10
Poster: Controls/Seeding/DAQ
This poster presents the 2nd version of the Karlsruhe Pulse Taking Ultra-fast Readout Electronics (KAPTURE-2) for continuous sampling of ultra-short pulses generated by terahertz (THz) detectors. KAPTURE-2 is able to sample each pulse with 4 to 8 sampling points with a resolution of down to 1 ps and accepts flexible pulse repetition rates in a range from 0.2 to 3.6 GHz. Low noise combined with...
Sven Pfeiffer
(DESY)
17/10/2019, 16:14
Poster: Controls/Seeding/DAQ
Cryo Module Test Bench (CMTB) is a facility at DESY to perform Continuous Wave (CW) and pulsed tests on European XFEL cryomodules. The facility is equipped with a 120 kW Inductive Output Tube (IOT), and more than 180 W of cryogenic power at 2 K can be used for the tests. Since last Summer, a new accelerating module, namely XM50.1, is installed at CMTB. Such a device is the first production...
Ms
Louise Springer
(DESY)
17/10/2019, 16:16
Poster: Controls/Seeding/DAQ
Latest free electron lasers (e.g. the EuropeanXFEL) produce x-ray light pulses of below 100fs duration. For this type of accelerator a most precise field detection is required to control the accelerating field inside the superconducting RF cavities. Latest low level RF (LLRF) controls, which are working with the non-IQ detection scheme, are limited to a few femtosecond timing jitter resolution...
Sven Pfeiffer
(DESY)
17/10/2019, 16:25
Poster: Controls/Seeding/DAQ
The longitudinal intra-bunch train beam-based feedback is used to correct arrival time fluctuations of the electron bunches at the free-electron laser in Hamburg (FLASH). The arrival time information is measured by a bunch arrival time monitor (BAM). The novel bunch arrival corrector cavity (BACCA) has been successfully commissioned and characterized. BACCA is a normal conducting RF cavity,...
Dr
Frank Ludwig
(DESY)
17/10/2019, 16:35
Poster: Controls/Seeding/DAQ
Poster
In the past two decades, radio-frequency (RF) controls
have improved by two orders in magnitude achieving
meanwhile sub-10 fs phase stabilities and 0.01% amplitude
precision. Advances are through improved field
detection methods and extensive usage of digital signal
processing on very powerful field programmable gate
arrays (FPGAs). Still the dominant limitation are todays
available...