OpenAccess

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2018-01-18
16:15
OpenAccess [PUBDB-2018-00694] Preprint/Report
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Resummation of Goldstone Infrared Divergences: A Proof to All Orders
[DESY-17-226; arXiv:1712.08068]
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The perturbative effective potential calculated in Landau gauge suffers from infrared problems due to Goldstone boson loops. These divergences are spurious and can be removed by a resummation procedure that amounts to a shift of the mass of soft Goldstones. [...]
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2018-01-18
15:05
OpenAccess [PUBDB-2018-00693] Conference Presentation

Integrated Photonics to the Rescue of Femtosecond Beam Diagnostics
International Beam Instrumentation Conference, IBIC 17, Meeting locationGrand Rapids, Michigan, USA, 20 Aug 2017 - 24 Aug 20172017-08-202017-08-24  GO
Beam instrumentation has always been using results from neighbouring communities. Over the last 10 years, a number of beam instruments and systems have successfullyadopted optical solutions, pushing performances from ps to fs, exploiting optical set-ups or photonic components. [...]
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2018-01-18
12:04
OpenAccess [PUBDB-2018-00689] Dissertation / PhD Thesis

Measurements of top-quark properties at 8 TeV using the ATLAS detector at the LHC
229 pp. (2017) [10.3204/PUBDB-2018-00689] = Dissertation, Bergische Universität Wuppertal, 2017  GO
This work presents the measurements of the charge asymmetry and top quark spin observables in ttbar events based on 20.3 fb$^{-1}$ of $\sqrt{s}$ = 8 TeV proton--proton collisions recorded with the ATLAS detector at the LHC. These analyses are performed in the dilepton final state, characterized by the presence of two isolated leptons (electrons or muons). [...]
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2018-01-18
11:34
OpenAccess [PUBDB-2018-00686] Contribution to a conference proceedings/Contribution to a book
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Material Tests for the ILC Positron Source
8th International Particle Accelerator Conference, IPAC 2017, Meeting locationCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19 Geneva : JACoW, 1293-1295 (2017) [10.3204/PUBDB-2018-00686]  GO
The positron source is a vital system of the ILC. The conversion target that yields about 10$^{14}$ positrons per second will undergo high peak and cyclic load during ILC operation. [...]
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2018-01-18
11:22
OpenAccess [PUBDB-2018-00685] Journal Article/Contribution to a conference proceedings
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Quark and Gluon iTMD parton distributions from HERA DIS data
38th International Conference on High Energy Physics, ICHEP2016, Meeting locationChicago, USA, 3 Aug 2016 - 10 Aug 20162016-08-032016-08-10 Proceedings of Science (ICHEP2016), 961 (2016) [10.3204/PUBDB-2018-00685]  GO
ddc:530
We describe a new approach to solve coupled quark and gluon DGLAP evolution equations with a Monte Carlo method. We show that this method is equivalent to other semi-analytical methods [...]
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2018-01-17
16:46
OpenAccess [PUBDB-2018-00682] Contribution to a conference proceedings/Contribution to a book
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Fast Image Analysis for Beam Profile Measurement at the European XFEL
16th International Conference on Accelerator and Large Experimental Control Systems, ICALEPCS2017, Meeting locationBarcelona, Spain, 8 Oct 2017 - 13 Jan 20182017-10-082018-01-13 JACoW, 4 pp. (2017) [10.3204/PUBDB-2018-00682]  GO
At the European XFEL, images of scintillator screens are processed at a rate of 10 Hz. Dedicated image analysis servers are used for transversal beam profile analysis as well as for longitudinal profile and slice emittance measurement [...]
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2018-01-17
16:42
OpenAccess [PUBDB-2018-00680] Contribution to a conference proceedings/Contribution to a book

RF-Energy Management for the European XFEL
16th International Conference on Accelerator and Large Experimental Control Systems, ICALEPCS2017, Meeting locationBarcelona, Spain, 8 Oct 2017 - 13 Oct 20172017-10-082017-10-13 JACoW, 3 pp. (2017) [10.3204/PUBDB-2018-00680]  GO
The European XFEL is in its commissioning phase at this time. One of the major tasks is to bring up all the 25 installed RF-stations, which will allow for a beam energy of up to 17.5 GeV [...]
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2018-01-17
16:39
OpenAccess [PUBDB-2018-00679] Contribution to a conference proceedings/Contribution to a book

Using Color Blindness Simulator During User Interface Development for Accelerator Control Room Applications
16th International Conference on Accelerator and Large Experimental Control Systems ICALEPCS 2017, ICALEPCS2017, Meeting locationBarcelona, Spain, 8 Oct 2017 - 13 Oct 20172017-10-082017-10-13 JACoW, 6 pp. (2017) [10.3204/PUBDB-2018-00679]  GO
For normally sighted developers it is hard to imagine how the user interface is going to look to a color blind person. Our purpose is to draw attention to people with color blindness and to consider their color vision [...]
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2018-01-17
16:36
OpenAccess [PUBDB-2018-00678] Contribution to a conference proceedings/Contribution to a book
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A Bunch-Synchronized Data Acquisition System for the European XFEL Accelerator
16th International Conference on Accelerator and Large Experimental Control Systems, ICALEPCS2017, Meeting locationBarcelona, Spain, 8 Oct 2017 - 13 Oct 20172017-10-082017-10-13 JACoW, 4 pp. (2017) [10.3204/PUBDB-2018-00678]  GO
The linear, super-conducting accelerator at the new Eu-ropean XFEL facility will be able to produce up to 2700 electron bunches for each shot at a repetition rate of 10 Hz. The bunch repetition rate might vary initially between 100 kHz and 4.5 MHz to accommodate the various needs of experiments at three different SASE beam lines. [...]
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2018-01-17
16:33
OpenAccess [PUBDB-2018-00677] Contribution to a conference proceedings/Contribution to a book
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Automating Operation Statistics at PETRA-3
16th International Conference on Accelerator and Large Experimental Control Systems, ICALEPCS2017, Meeting locationBarcelona, Spain, 8 Oct 2017 - 13 Oct 20172017-10-082017-10-13 JACoW, 4 pp. (2017) [10.3204/PUBDB-2018-00677]  GO
The quoted machine availability of a particle accelerator over some time range is usually hand-generated by a machine coordinator, who pores over archived operations parameters and logbook entries for the time period in question. When the machine is deemed unavailable for operations, 'blame' is typically assigned to one or more machine sub-systems. [...]
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