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| FRCOMA01 |
‘WhiteRabbit’ - A novel, high precision timing system
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192 |
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- M. Kreider, R. Baer, T. Fleck, C. Prados
GSI, Darmstadt
- E. G. Cota, J. Serrano, T. Wlostowski
CERN, Geneva
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The WhiteRabbit timing network is a deterministic field bus, based on synchronous GBit Ethernet and the Precision Timing Protocol (PTP). The WR protocol was designed to provide precise timing and event distribution for high end real-time systems and was therefore chosen as the timing basis for the new GSI FAIR accelerator facility. With precise phase measurement to compensate for signal propagation delay, a timing accuracy down to sub-nanosecond range is feasible. To achieve necessary determinism and robustness (packet loss of ~10-12 ), an OSI layer two forward error correction and QOS protocol have been introduced. Special switches wield the WR protocol, while being transparent to normal Ethernet traffic. Switch hardware is currently under development at CERN and will be a mixed FPGA/CPU solution. Working prototype cards have been introduced at the 3rd WR Workshop at CERN in 2009, demonstrating phase measurement and PTP capabilities. The presentation will contain detail on technical concepts, current project status, as well as future areas of application will be part of the discussion.
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Slides
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| FRCOMA02 |
FLASH DAQ Data Management and Access Tools
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195 |
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- V. Rybnikov, V. Kocharyan, K. Rehlich, E. Sombrowski, T. Wilksen
DESY, Hamburg
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The Free Electron Laser in Hamburg (FLASH) at DESY is a user facility for the photon science community. It produces laser light of short wavelengths from the extreme ultraviolet down to soft X-rays. To study, monitor and document the machine performance and parameters and also to collect the results of the experiment measurements, a fast data acquisition (DAQ) system has been developed. Having above 1000 linear accelerator diagnostics channels collected by the DAQ currently results in a data rate of ~100MB/s. The large amount of data requires corresponding data storage and management to enable an efficient data retrieval. This paper will focus on the data paths, storage and bookkeeping. A number of tools provided for the users to work with DAQ data will be described. The current status of the achieved performance in the data storage and retrieval will be covered as well.
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Slides
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| FRCOMA03 |
Beam Profile Monitoring System for XFEL/SPring-8
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198 |
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- T. Matsumoto, A. Yamashita
JASRI/SPring-8, Hyogo-ken
- S. I. Inoue
SES, Hyogo-pref.
- Y. Otake
RIKEN/SPring-8, Hyogo
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XFEL/SPring-8 will start beam commissioning in March 2011. Beam profile monitors are an important tool for beam diagnostics. The diagnostic tool monitors beam profile images and evaluates beam shapes and intensities in real time. Image data is stored with a beam tagged number to be compared with other synchronized data such as beam position monitors. Many functions are required to the diagnostic tool. The monitor system consists of screens and CCD cameras with lens assemblies. The screens and lenses are controlled with programmable logic controllers. The cameras are connected to a PC with Camera Link. To choose a camera, selectors are used. On the PC, a server program writes image data into shared memory and a diagnostics tool fetches the data. The diagnostics tool is developed using Python with a graphical user interface (GUI) based on wxPython. In the GUI, several functions such as image analysis, camera control, data record and viewer are required, and easily implemented with the Python. The beam profile monitoring system was tested with the SCSS prototype accelerator under similar condition, and then will be applied to XFEL/SPring-8.
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Slides
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| FRCOMA04 |
Embedded Controller for Industrial CT trigger module
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201 |
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- G. H. Gong, T. Xue
Tsinghua University, Beijing
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The industrial CT is used to generate a 3D image of the inside of an object, it consists of an accelerator x-ray source, a detector array and readout electronics. A trigger module collects the position information from three decoders installed all the 3 moving axis of rotation, shift and lift, and generates trigger signal according to the predefined trigger algorithm; the decoder information is also sent to the readout electronics. The SCS (system control station) can remotely communicate with trigger module to change the working modes and parameters during the scan process. The trigger module utilizes an embedded controller board which consists of a PowerPC controller running the Linux operation system to support the TCP socket connection with SCS, and a FPGA connected to the PowerPC local bus acts as a customized peripheral to carry out the trigger logic. With different interface mezzanines and online reloadable firmware, the trigger module has great flexibility to work with different decoders, different readout electronics.
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