FLC

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2018-08-07
12:02
OpenAccess [PUBDB-2018-02769] Book/Report/Dissertation / PhD Thesis
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Time development of hadronic showers in a Highly Granular Analog Hadron Calorimeter
[DESY-THESIS-2018-023]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 259 pp. () [10.3204/PUBDB-2018-02769] = Dissertation, Universität Hamburg, 2018  GO
This thesis presents the study of the time development of hadronic showers in a highly granular hadron calorimeter using data collected by the CALICE Analog Hadron Calorimeter (AHCAL) technological prototype at the Super Proton Synchrotron (SPS) at CERN in July 2015 in μ−, e− and hadron beams up to 90 GeV.Highly granular calorimeters are designed for the concept of Particle Flow Algorithm which aims to mea- sure each individual particle in a jet using the best sub-detector measurement. The Particle Flow approach is a key aspect of the detectors for the International Linear Collider (ILC) which is a future linear lepton collider designed for precision physics studies at a center of mass energy up to 500 GeV.The CALICE Collaboration is developing highly granular calorimeters for future colliders. [...]
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2018-07-26
19:20
OpenAccess [PUBDB-2018-02704] Book/Report/Master Thesis
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Vlasov Simulation of Exotic Phase-Space Densities via Tree-Based Domain-Decomposition
[DESY-THESIS-2018-022]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 77 pp. () [10.3204/PUBDB-2018-02704] = Masterarbeit, Universität Hamburg, 2018  GO
Magnetic bunch compression is used to produce the high-brightnesselectron bunches needed for the operation of a free-electron laser.A longitudinal energy chirp -- imprinted on the bunch via off-crestacceleration -- results in the compression of the bunch in a subsequentdispersive section of the accelerator in form of a magnetic chicane.Such a setup sets the stage for the self-interaction of charge-densityinhomogeneities via the space-charge fields they generate within the bunch.This can potentially lead to an enhancement of initially present charge-densitymodulations; an effect known as microbunching amplification.Numerical simulation of this dynamics is encumbered by the fact thatphase-space densities of electron bunches encountered at free-electron laserstypically exhibit an ``exotic'' structure, as they form a thin, hair-like bandmeandering through phase-space.In this thesis, a Vlasov-simulation approach based on tree domain-decompositionis presented, that allows for the efficient simulation of these phase-spacedensities despite their exoticness.Further, a beam-dynamics model is presented, which most notably enables thetime-discrete treatment of collective space-charge effects in drift regions ofthe accelerator.Based on this model an arbitrary-order perturbation theory for themicrobunching gain in a bunch-compressor is conceived and applied to the caseof a long bunch with monochromatic density modulation.Finally, the results from theory and simulation are compared as part of thebenchmarking of the simulation code..
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2018-02-06
13:52
OpenAccess [PUBDB-2018-01077] Talk (non-conference)
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The DESY II Test Beam Facility – Status and Future
6th Beam Telescopes and Test Beam Workshop 2018, BTTB6, DESYZürich, DESY, Switzerland, 16 Jan 2018 - 19 Jan 20182018-01-162018-01-19  GO
The DESY II Test Beam Facility will resume operations mid February 2018. The current status and possibilities for future improvements and extensions of the facility will be presented..
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2018-01-11
16:31
arXiv [PUBDB-2018-00554] Report/Journal Article
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Extracting the top-quark running mass using $t\bar{t} + \hbox {1-jet}$ events produced at the Large Hadron Collider
[HU-EP-17-05; LAL-17-034; DESY-17-053; arXiv:1704.00540]
We present the calculation of the next-to-leading order QCD corrections for top-quark pair production in association with an additional jet at hadron colliders, using the modified minimal subtraction scheme to renormalize the top-quark mass. The results are compared to measurements at the Large Hadron Collider run I. [...]
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2018-01-10
11:49
OpenAccess [PUBDB-2018-00325] Preprint/Report
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The role of positron polarization for the inital $250$ GeV stage of the International Linear Collider
[DESY-17-237; KEK Preprint 2017-57; SLAC-PUB-17197; arXiv:1801.02840]
 GO
The International Linear Collider is now proposed with a staged machine design, with the first stage at $\sqrt{s}=$~250 GeV and an integrated luminosity goal of 2~ab$^{-1}$. One of the questions for the machine design is the importance of positron polarization. [...]
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2018-01-02
13:15
OpenAccess [PUBDB-2018-00022] Conference Presentation

The ILD detector concept
2017 International Workshop on Future Linear Colliders, LCWS2017, StrasbourgStrasbourg, France, 23 Oct 2017 - 27 Oct 20172017-10-232017-10-27  GO
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2017-12-22
16:09
[PUBDB-2017-14106] Lecture

Moderne Techniken der Teilchenphysik (Pflichtseminar)
Lecture at Heidelberg (), 20 Oct 20172017-10-20

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2017-12-22
16:05
[PUBDB-2017-14105] Lecture

Experimentalphysik IV (Kern- und Teilchenphysik) - Übungen
Lecture at Heidelberg (Germany), 21 Apr 2017 - 21 Jul 20172017-04-212017-07-21

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2017-12-22
15:56
arXiv [PUBDB-2017-14104] Preprint/Report
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Construction and Response of a Highly Granular Scintillator-based Electromagnetic Calorimeter
[arXiv:1707.07126]
A highly granular electromagnetic calorimeter with scintillator strip readout is being developed for future lepton collider experiments. A prototype of 21.5 $X_0$ depth and $180 \times 180 $mm$^2$ transverse dimensions was constructed, consisting of 2160 individually read out $10 \times 45 \times 3$ mm$^3$ scintillator strips. [...]
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2017-12-22
15:41
arXiv [PUBDB-2017-14102] Report/Journal Article
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Tracking within Hadronic Showers in the CALICE SDHCAL prototype using a Hough Transform Technique
[arXiv:1702.08082]
The high granularity of the CALICE Semi-Digital Hadronic CALorimeter (SDHCAL)provides the capability to reveal the track segments present in hadronic showers. These segmentsare then used as a tool to probe the behaviour of the active layers in situ, to better reconstructthe energy of these hadronic showers and also to distinguish them from electromagnetic ones. [...]
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ddc:610
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