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000478351 1001_ $$0P:(DE-H253)PIP1012894$$aBousonville, Michael$$b0$$eCorresponding author$$udesy
000478351 1112_ $$a31st International Linear Accelerator Conference$$cLiverpool$$d2022-08-28 - 2022-09-02$$gLINAC2022$$wUK
000478351 245__ $$aSolving the USB Communication Problem of the High-Voltage Modulator Control System in the European XFEL
000478351 260__ $$a[Geneva]$$bJACoW Publishing, Geneva, Switzerland$$c2022
000478351 29510 $$aProceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK
000478351 300__ $$a451-453
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000478351 500__ $$aLiteraturangaben;
000478351 520__ $$aSince the commissioning of the modulators in the European XFEL in 2016, it happened from time to time that the modulator control system hung up. The reason for the problem was unknown at that time. Initially, the MTBF (Mean Time Between Failure) was 10⁴ days, which was so rare that other problems with the RF system clearly dominated and were addressed first. Over the next 2 years, the error became more frequent and occurred on average every 18 days. After the winter shutdown of the XFEL in 2020, the problem became absolutely dominant, with an MTBF of 2 days. Therefore, the fault was investigated with top priority and was finally identified. Two units of the control electronics communicate via USB 2.0 with the main server. Using special measurement technology, it was possible to prove that weak signal levels in the USB signal led to bit errors and thus to the crash of the control electronics. This article describes the troubleshooting process, how to measure the signal quality of USB signals and how the problem was solved in the end.
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000478351 650_7 $$2autogen$$acontrols
000478351 650_7 $$2autogen$$aelectron
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000478351 650_7 $$2autogen$$aFEL
000478351 650_7 $$2autogen$$aoperation
000478351 693__ $$0EXP:(DE-H253)XFEL(machine)-20150101$$1EXP:(DE-H253)XFEL-20150101$$5EXP:(DE-H253)XFEL(machine)-20150101$$aXFEL$$eFacility (machine) XFEL$$x0
000478351 7001_ $$0P:(DE-H253)PIP1003160$$aChoroba, Stefan$$b1$$udesy
000478351 7001_ $$0P:(DE-H253)PIP1002447$$aGrevsmühl, Torsten$$b2
000478351 7001_ $$0P:(DE-H253)PIP1006205$$aGoeller, Sebastian$$b3$$udesy
000478351 7001_ $$0P:(DE-H253)PIP1002463$$aHauberg, Axel$$b4$$udesy
000478351 7001_ $$0P:(DE-H253)PIP1006409$$aWeinhausen, Timo$$b5$$udesy
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