The analytical presentation of solid border basement in conditions of solid stamp effect

The current level of construction and, moreover, the future value the right apressiation of mechanical capabilities of the structure basement. The calculation of additional resource of strength basement of each structure brings to increasing of value of structure. The increasing of reliability and sustainability of structures is one of the problems of modern applied mechanics. The correct assessment of the strength of basement is very important in solving this problem. It is still conditional to determine the computational depth of basement. Numerous experimental studies have shown that in the case of distributed load of constant intensity, the dependence of sediment from the base sizes is expressed by strict nonlinear connection. The solvation of problem of constant thick layer gives the linear connection by methods of elasticity of theory. The purpose of eliminating that essential discrepancy with experimental results, the solved problem, proposed by the academician S.S. Grigoyan and applied by his students, is an important step towards solving

The New Timing System for the European XFEL

The European XFEL will run with up to 27 000 bunches per second. Bunches with differentparameters can be delivered to several experiments in parallel. A hardware based synchronizationscheme to reliably control all subsystems has been developed. It is based on delaycompensated fiber links in a multi-start topology. Precision clocks, triggers, and configurationparameters are distributed from a central place to about 200 slave nodes distributedalong the 3 km long facility. A versatile protocol to synchronize all parts of the accelerator isused to prepare fast feedbacks, the machine protection systems, and the data acquisition beforethe subsequent bunch train. The timing system is based on the advanced features of theMicroTCA (MTCA.4) standard. First experiences with this system at FLASH will be describe

The Evolution of the DOOCS C++ Code Base

This contribution traces the development of DESY's control system DOOCS from its origins in 1992 to its current state as the backbone of the European XFEL and FLASH accelerators and of the future Petra IV light source. Some details of the continual modernization and refactoring efforts on the 1.5 million line C++ code base are highlighted

Design and Beam Test Results of the Reentrant Cavity BPM for the European XFEL

International audienceThe European X-ray Free Electron Laser (E-XFEL) will use reentrant beam position monitors (BPMs) in about one quarter of the superconducting cryomodules. This BPM is composed of a radiofrequency (RF) reentrant cavity with 4 antennas and an RF signal processing electronics. Hybrid couplers, near the cryomodules, generate the analog sum and difference of the raw pickup signals coming from two pairs of opposite RF feedthroughs. The resulting sum (proportional to bunch charge) and difference signals (proportional to the product of position and charge) are then filtered, down-converted by an RF front-end (RFFE), digitized, and digitally processed on an FPGA board. The task of CEA/Saclay was to cover the design, fabrication and beam tests and deliver these reentrant cavity BPMs for the E-XFEL linac in collaboration with DESY and PSI. This paper gives an overview of the reentrant BPM sys-tem with focus on the last version of the RF front end electronics, signal processing, and overall system performance. Measurement results achieved with prototypes installed at the DESY FLASH2 linac and in the E-XFEL injector are presented

The Large Scale European XFEL Control System: Overview and Status of the Commissioning

The European XFEL is a 3.4 km long X-ray Free Electron Laser in the final construction and commissioning phase in Hamburg. It will produce 27000 bunches per second at 17.5 GeV. Early 2015 a first electron beam was produced in the RF-photo-injector and the commissioning of consecutive sections will follow during this and next year. The huge number and variety of devices for the accelerator, beam line, experiment,cryogenic and facility systems pose a challenging control task. Multiple systems, including industrial solutions, must be interfaced to each other. The large number of bunches requires a tight time synchronization (down to picoseconds) and high performance data acquisitionsystems. Fast feedbacks from front-ends, the DAQs and online analysis system with a seamless integration of controls are essential for the accelerator and the initially 6 experimental end stations. It turns out that the European XFEL will be the first installation exceeding 2500 FPGAcomponents in the MicroTCA form factor and will run one of the largest PROFIBUS networks. Many subsystem prototypes are already successfully in operation. An overview and status of the XFEL control system will be given

The Large Scale European XFEL Control System: Overview and Status of the Commissioning

The European XFEL is a 3.4km long X-ray Free Electron Laser in the final construction and commissioning phase in Hamburg. It will produce 27000 bunches per second at 17.5GeV. Early 2015 a first electron beam was produced in the RF-photo-injector and the commissioning of consecutive sections is following during this and next year. The huge number and variety of devices for the accelerator, beam line, experiment, cryogenic and facility systems pose a challenging control task. Multiple systems, including industrial solutions, must be interfaced to each other. The high number of bunches requires a tight time synchronization (down to picoseconds) and high performance data acquisition systems. Fast feedbacks from front-ends, the DAQs and online analysis system with a seamless integration of controls are essential for the accelerator and the initially 6 experimental end stations. It turns out that the European XFEL will be the first installation exceeding 2500 FPGA components in the MicroTCA form factor and will run one of the largest PROFIBUS networks. Many subsystem prototypes are already successfully in operation. An overview and status of the XFEL control system will be given