A system for distributing high-speed synchronous high-precision clock and trigger data over large distances

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Hidvegi, AttilaStockholms universitet,Fysikum (author)

A system for distributing high-speed synchronous high-precision clock and trigger data over large distances

Article/chapterEnglish2008

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2008
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LIBRIS-ID:oai:DiVA.org:kth-154121
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-154121URI
https://doi.org/10.1109/NSSMIC.2008.4774885DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-64531URI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:kon swepub-publicationtype

Series

IEEE Nuclear Science Symposium Conference Record,1095-7863

Notes

QC 20141024
The distribution of precise timing throughout the European X-ray Free Electron Laser project [1] (XFEL) and its triggering system is a very challenging part of the system design. ADCs in data acquisition systems and DACs in control systems will require very high precision clocks. The clocks need to be synchronous to each other, both in frequency and phase, with a jitter performance better than 5 ps (RMS). At some high-speed ADCs it might even need a precision down to 0.1 ps. The frequencies that must be available are the main 1.3 GHz and some frequencies below, which are all derived from the main frequency. The phase needs to be adjustable to allow synchronization between separate devices. Triggering information needs to be distributed over the system, so that controlling instructions can be carried out at a very precise time. This is very important since the beam will travel with the speed of light, and there is no possibility for information to be sent back and forth. This requires an absolute timing to be distributed over the system. Both the main clock and triggering information will be transmitted over the same fiber cable, one to each device. An advanced synchronization method needs to be developed to synchronize the phases of the clocks throughout the whole system. The delay through the cable can change with temperature, and due to long cables the total change through a single cable can be significant. It is essential that the clocks are stable and not drifting away from each other. Therefore a continuous calibration method is needed, ensuring that the clocks are synchronous throughout the whole system. A prototype of such a system is being developed and a first version is expected to be completed in 2009 Ql.

Subject headings and genre

NATURVETENSKAP Fysik hsv//swe
NATURAL SCIENCES Physical Sciences hsv//eng
NATURVETENSKAP Fysik Acceleratorfysik och instrumentering hsv//swe
NATURAL SCIENCES Physical Sciences Accelerator Physics and Instrumentation hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Reglerteknik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Control Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Annan elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
Absolute timing
Calibration method
Data acquisition system
Fiber cables
High precision
High-speed
Information need
Jitter performance
Main frequency
Separate devices
Speed of light
Synchronization method
System design
Triggering systems
Whole systems
X-ray free electron lasers
Cables
Free electron lasers
Jitter
Lasers
Time measurement
Clocks
fysik

Added entries (persons, corporate bodies, meetings, titles ...)

Geler, P.Deutsches Elektronen-Synchrotron (DESY) (author)
Rehlich, K.Deutsches Elektronen-Synchrotron (DESY), (author)
Bohm, ChristianStockholms universitet,Fysikum(Swepub:su)bohm (author)
Rydström, StefanStockholms universitet,KTH,Fysik,Fysikum(Swepub:kth)u1wkfhc0 (author)
Stockholms universitetFysikum (creator_code:org_t)

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In:Nuclear Science Symposium Conference Record, 2008. NSS '08. IEEE, s. 2581-25849781424427147

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By the author/editor: Hidvegi, Attila; Geler, P.; Rehlich, K.; Bohm, Christian; Rydström, Stefan

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Accelerator Phys ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Control Engineer ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Other Electrical ...

Parts in the series: IEEE Nuclear Sci ...

Articles in the publication: Nuclear Science ...

By the university: Royal Institute of Technology; Stockholm University

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