1,720,974 research outputs found
Elektronische Instrumentierung : proceedings, 110. SEI-Tagung, Jülich, Deutschland, 8.-10 April, 2019
No full textElektronik und Firm-/Software wird mit spezialisierten Anforderungen in vielen For-schungsprojekten benötigt. So haben viele Forschungszentren und auch Universitäten Entwicklungsgruppen, die sich diesen Aufgaben stellen. Auch gibt es In-dustriebetriebe, die spezialisierte Beiträge beisteuern. Mit der Idee, dass man indiesem Umfeld von einander profitieren und zusammenarbeiten kann, treffen sichjedes Jahr einmal Techniker/-innen, Ingenieure/-innen und Wissenschaftler/-innen,um sich mit Vorträgen, einer Ausstellung und Gesprächen auszutauschen. Organisiert wird die Tagung von den Helmholtz-Zentren, offen für andere Vortragende und Teilnehmer/innen. Dieses Jahr war das ZEA-2, Systemhaus für die Forschung, am Forschungszentrum FZJ in Jülich der Gastgeber.Es waren sechs Helmholtz-Zentren, DESY, FZJ, GSI, HZG, HZDR und KIT, vertreten. Daneben nutzten Universitätsvertreter/innen die Gelegenheit des Austausches. Die Industrie präsentierte auf High-End Anwendungen spezialisierte Geräte und waren für viele Fachgespräche offen. Die Thematiken der Tagung umfassten: - Schnelle Datenaufnahme, -verarbeitung und -übertragung, - ASIC's zu Datenübertragung und spezifischer Messsignalaufbereitung, - Kontrolle von Aktoren und Auslese langsamerer Sensoren- Fertigung von Elektronik und Geräten mit Elektronik, - Kooperation zu Entwicklungen mit der Industrie, - Wie testet man Elektronik und Firm-/Software? An einem halben Tag wurde ein Technikbetrieb zur Papierverarbeitung besichtigt. Auch da wurde gezeigt, dass die Steuerung von Maschinen anspruchsvoll ist und teils ähnliche Aspekte wie die Steuerung der Forschungsanlage aufweist. Das Tagungsprogramm ist auf dem Internet einzusehen: https://indico.desy.de/indico/event/22503/ oderhttps://indico.desy.de//event/SEI 2019. Die Homepage der Studiengruppe ist auf http://sei.desy.de/ zu finden. Ein Workshop über "Testen" diente dem Austausch, wie man sich zum einen der Vielfalt der spezialisierten Geräte effizient stellt und spezifische Eigenschaften im Testerfasst, und zum anderen doch von Wiederverwendbarkeit und Standards profitiert
Status and Commissioning of the Wire Scanner System for the European XFEL
No full textThe European-XFEL (E-XFEL) is an X-ray Free ElectronLaser facility located in Hamburg (Germany). The superconductingaccelerator for up to 17.5 GeV electrons will provide photons simultaneously to several user stations. Currently12 Wire Scanner stations are used to image transverse beamprofiles in the high energy sections. These scanners provide a slow scan mode which is currently used to measure beam emittance and beam halo distributions. When operating with long bunch trains (>100 bunches) also fast scans are planned to measure beam sizes in an almost nondestructivemanner. This paper describes the current installations and the latest developments of the system at European-XFEL.Furthermore, the commissioning status of the system andf irst results of beam halo studies will be shown
The European XFEL Beam Loss Monitor System
No full textThe European XFEL MTCA based Beam Loss Monitor System (BLM) is composed of about 470 monitors, which are part of the Machine Protection System (MPS). The BLMs detect losses of the electron beam, in order to protect accelerator components from damage and excessive activation, in particular the undulators, since they are made of permanent magnets. Also each cold accelerating module is equipped with a BLM to measure the sudden onset of field emission (dark current) in cavities. In addition some BLMs are used as detectors for wire- scanners. Experience from the already running BLM system in FLASH2 which is developed for XFEL and tested here, led to a fast implementation of the system in the XFEL. Further firmware and server developments related to alarmg eneration and handling are ongoing.The BLM systems structure, the current status and the different possibilities to trigger alarm
A Fast Wire Scanner System for the European XFEL and Its Impact on SafetySystems
No full textThe European-XFEL is an X-ray Free Electron Laser facility located in Hamburg (Germany). The 17.5 GeV superconducting accelerator will provide photons simultaneously to several user stations. Currently 12 Wire Scanner stations are used to image transverse beam profiles in the high energy sections. These scanners provide a slow scan mode for singlebunch operation. When operating with long bunch trains(>100 bunches) fast scans are used to measure beam sizes in an almost nondestructive manner. To operate fast scans multiple impacts on the beam loss system (BLM) and the charge transmission interlock (TIS) have to be taken into account.This paper focusses on the interaction between these systems and first experiences performing measurements
Status for Standard Diagnostics
No full textContent: Standard diagnostics: Dosimetry+Screen,BLM+BHM,Wire scanner,Toroid,Dark Current Monitor,BP
A Fast Wire Scanner System for the European XFEL
No full textThe European-XFEL is an X-ray Free Electron Laser facility located in Hamburg (Germany). The 17.5 GeV superconducting accelerator will provide photons simultaneously to several user stations. Currently 14 Wire Scanner stations are used to image transverse beam profiles in the high energy sections. These scanners provide a slow scan mode for beam halo studies and beam optics matching. When operating with long bunch trains (>100 bunches) fast scans will be used to measure beam sizes in an almost non-destructive manner. This paper briefly describes the wire scanner setup and focusses on the fast scan concept and first measurements
The European XFEL Wire Scanner System
No full textThe European-XFEL (E-XFEL) is an X-ray Free ElectronLaser facility located in Hamburg (Germany). The superconducting accelerator for up to 17.5 GeV electrons will provide photons simultaneously to several user stations. Currently12 Wire Scanner units are used to image transverse beamprofiles in the high energy sections. These scanners provide a slow scan mode which is currently used to measure beam emittance and beam halo distributions. When operating with long bunch trains (>100 bunches) also fast scans are planned to measure beam sizes in an almost nondestructive manner.Scattered electrons can be detected with regular Beam Loss Monitors (BLM) as well as dedicated wire scanner detectors.Latter are installed in different variants at certain positions in the machine. Further developments are ongoing to optimize the sensitivity of the detectors to be able to measure both, beam halo and beam cores within the same measurement with the same detector. This paper describes the current status of the system and examples of different slow scan measurements
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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