Conveners
Session 3: Controls/Seeding/DAQ: Talks
- Holger Schlarb (MSK (Strahlkontrollen))
Session 3: Controls/Seeding/DAQ: Speed Talks
- Julian Gethmann (KIT)
Session 3: Controls/Seeding/DAQ: Posters
- Julian Gethmann (KIT)
Light sources are used by many users at the same time. Each user is able to adjust different settings, e.g. insertion device parameters. Light source operation tries to minimize their crosstalk, i.e. settings of one user should not change the beam of a different user. The vertical beam size is a parameter that should be tightly controlled.
Data reveals that the vertical beam size takes a...
The ARES linac at DESY aims at producing and characterizing ultrashort (fs to sub-fs) electron bunches with high stability for cutting-edge applications related to accelerator R&D (e.g. Advanced and compact longitudinal diagnostics development, medical applications i.a. in collaboration with UKE, external injection into advanced accelerating structures, etc.). The current status and...
This talk names the different computer and data systems that are needed for efficiently working with accelerators for the example of KIT's IBPT's accelerators. It shows why and how to make them accessible to accelerator physicist of various kind via cleanly coded Python wrappers and how to keep them maintainable.
DESY is developing a MicroTCA.4-based multi-axis motion controller: DAMC-MOTCTRL. This board is a contribution to the ecosystem, since it enables controlling motion in big experiments from within the MicroTCA crate. It is designed to move up to 48 stepper motors per card in parallel - which means each card replaces up to 6 VME cards. One major benefit is the possibility to aggregate multiple...
With the advent of modern systems on chips (SoCs) and multiprocessor systems on chips (MPSoCs), there are clear advantages to using embedded Linux as an operating system. It is an open-source operating system that supports multiprocessing, and there are a variety of open-source hardware drivers and application software. The most important advantage, however, is that chip vendors provide...
On this poster, we will present a status update on the carrier suppression interferometer based RF recevier with the last measurement restults and future plans for tests at CMTB/DESY.
The external seeding scheme Echo-Enabled Harmonic Generation (EEHG) utilizes two modulators and two chicanes to manipulate the longitudinal phase space of an electron beam to achieve bunching at higher harmonics of the seed laser wavelength. High-Gain Harmonic Generation (HGHG) makes use of a single modulator-chicane setup, but is limited to lower harmonics due to more stringent requirements...
To generate the electrons to be accelerated, a photoin-jection 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...
Linear particle accelerators require outstanding synchronization of the subsystems to provide high quality results for temporally resolved experiments. Considering the laser-based synchronization system at the European X-Ray Free-Electron Laser, the optimization process involves searching for the global optimum in a high-dimensional parameter space whereby safety constraints are fulfilled. For...
The CW operation mode of the superconducting linear accelerator ELBE allows
reinterpreting a beam-based feedback control problem as a regulation goal.
By moving the focus of attention to low-frequency RF noise, i.e. the disturbance
that makes a significant contribution to electron beam fluctuations, the necessity
to pursue a bandwidth-demanding bunch-by-bunch control can be...
Reinforcement learning (RL) has enabled the development of intelligent controllers for complex tasks that previously required human intuition to solve. In the context of particle accelerators, there exist many such tasks and solving them with conventional methods takes away from scarce experiment time and limits the operability of accelerators. We demonstrate how to successfully apply RL to...
Future development in the LLRF system is needed to suppress the microphonics disturbances to drive SRF cavities in the EUXFEL within CW/LP field stability.
The current CW LLRF system implements a narrowband Least Mean Square (LMS) Active Noise Controller (ANC) to compensate for sinusoidal microphonics disturbances.
The major limitation of using narrowband LMS ANC is that it can reject only...
Developers have proposed various hardware accelerators to improve the CNN inference performance on embedded platforms. Recently, Xilinx announced its first 7-nm FPGA accelerator, the Versal ACAP, delivering a high-performance, heterogeneous computing platform adaptable to the application requirements. However, as early studies were concerned with the most common deep learning architectures for...
In the beam controls group in DESY, the FPGA firmware is developed with the use of a custom framework, called FWK. This framework has been developed in order to provide FPGA firmware for European XFEL for LLRF, special diagnostic and synchronization systems.
In the past two years FWK went a number of changes which allowed to make it open source. The main goal of the changes is to provide a...
We present in cooperation with the industry a precision rf cable shield measurement setup to be able to measure the transfer impedance and the screening attenuation. We discuss the proper selection of rf-cables, quality control issues during the production and usage and how to avoid (semi) faulty transitions.
PETRA IV will be a new, fourth-generation, high-brilliance synchrotron radiation source in the hard X-ray range. To keep the emittance low at high beam current an active feedback system to damp transverse multi-bunch instabilities is required. The particular challenge to the system is the very low-noise, while maintaining high bandwidth, which is defined by the 2 ns bunch spacing.
We present...
