OpenAccess

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2018-05-23
11:19
OpenAccess [PUBDB-2018-02055] Report/Journal Article
; ; ; et al
Search for γ -Ray Line Signals from Dark Matter Annihilations in the Inner Galactic Halo from 10 Years of Observations with H.E.S.S.
[arXiv:1805.05741]
Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy γ rays. The central region of the Milky Way halo is one of the most promising targets given its large amount of DM and proximity to Earth [...]
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ddc:550
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2018-05-23
10:59
OpenAccess [PUBDB-2018-02053] Report/Journal Article
; ; ; et al
From the $SU(2)$ quantum link model on the honeycomb lattice to the quantum dimer model on the kagome lattice: Phase transition and fractionalized flux strings
[arXiv:1712.08300]
We consider the (2+1)-dimensional SU(2) quantum link model on the honeycomb lattice and show that it is equivalent to a quantum dimer model on the kagome lattice. The model has crystalline confined phases with spontaneously broken translation invariance associated with pinwheel order, which is investigated with either a Metropolis or an efficient cluster algorithm [...]
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ddc:530
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2018-05-23
10:56
OpenAccess [PUBDB-2018-02052] Report/Journal Article
; ; ; et al
Strange nucleon electromagnetic form factors from lattice QCD
[arXiv:1801.09581]
We evaluate the strange nucleon electromagnetic form factors using an ensemble of gauge configurations generated with two degenerate maximally twisted mass clover-improved fermions with mass tuned to approximately reproduce the physical pion mass. In addition, we present results for the disconnected light quark contributions to the nucleon electromagnetic form factors [...]
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ddc:530
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2018-05-23
10:00
OpenAccess [PUBDB-2018-02045] Contribution to a conference proceedings
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RF Electronics for the Measurement of Beam Induced Higher Order Modes (HOM) Implemented in the MICROTCA.4 Form Factor
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 , 3 pp. () [10.3204/PUBDB-2018-02045]  GO
Higher order modes (HOM) excited in RF accelerating cavities by a particle beam can be used for electron beam diagnostics. Phase of a monopole HOM provides infor-mation about the beam phase relative to the externally induced RF field in a cavity (BPhM) [1] . [...]
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2018-05-22
14:43
OpenAccess [PUBDB-2018-02033] Contribution to a conference proceedings/Contribution to a book
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Sub-Femtosecond Time-Resolved Measurements Based on a Variable Polarization X-Band Transverse Deflecting Structures for SwissFEL
38th International Free Electron laser Conference, FEL 2017, Santa Fe, N.M.Santa Fe, N.M., United States, 20 Aug 2017 - 25 Aug 20172017-08-202017-08-25 Geneva : JACoW , 491-494 () [10.18429/JACoW-FEL2017-WEP040]  GO
The SwissFEL project, under commissioning at the Paul Scherrer Institut (PSI), will produce FEL radiation for soft and hard X-rays with pulse durations ranging from a few to several tens of femtoseconds. A collaboration between DESY, PSI and CERN has been established with the aim of developing and building an advanced X-Band transverse deflector structure (TDS) with the new feature of providing variable polarization of the deflecting force. [...]
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2018-05-22
09:49
OpenAccess [PUBDB-2018-02015] Journal Article/Report/Contribution to a conference proceedings
; ;
SL(2,$\mathbb{C}$) Gustafson Integrals
[DESY-17-200; arXiv:1711.07822]
Elliptic Hypergeometric Functions in Combinatorics, Integrable Systems and Physics, ViennaVienna, Austria, 20 Mar 2017 - 24 Mar 20172017-03-202017-03-24 Symmetry, integrability and geometry: methods and applications 14, 030 () [10.3842/SIGMA.2018.030]  GO
It was shown recently that many of the Gustafson integrals appear in studies of the SL(2,$\mathbb{R}$) spin chain models. One can hope to obtain a generalization of the Gustafson integrals considering spin chain models with a different symmetry group [...]
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ddc:530
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2018-05-18
23:26
OpenAccess [PUBDB-2018-02013] Contribution to a conference proceedings
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A PETRA IV Lattice Based on Hybrid Seven Bend Achromats
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 , 4 pp. () [10.3204/PUBDB-2018-02013]  GO
For the PETRA IV project at DESY it is planned to convert the 6 GeV synchrotron light source PETRA III into a diffraction limited storage ring with ultra-low emittances. PETRA IV should provide a natural emittance two orders of magnitude smaller as now. [...]
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2018-05-18
23:22
OpenAccess [PUBDB-2018-02012] Poster
; ; ; et al
A PETRA IV Lattice Based on Hybrid Seven Bend Achromats
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04  GO
For the PETRA IV project at DESY it is planned to convert the 6 GeV synchrotron light source PETRA III into a diffraction limited storage ring with ultra-low emittances. PETRA IV should provide a natural emittance two orders of magnitude smaller as now. [...]
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2018-05-18
23:04
OpenAccess [PUBDB-2018-02009] Contribution to a conference proceedings
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Optimization of the Injection Kicker Bump Leakage at PETRA III
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 , 4 pp. () [10.3204/PUBDB-2018-02009]  GO
PETRA III is a third generation synchrotron light source at DESY delivering high brightness photon beams for users at 21 beam lines. It is operated at 6 GeV with a beam current of 100 mA in top-up mode and is in operation for users since 2010. [...]
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2018-05-18
22:48
OpenAccess [PUBDB-2018-02008] Poster
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Optimization of the Injection Kicker Bump Leakage at PETRA III
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04  GO
PETRA III is a third generation synchrotron light source at DESY delivering high brightness photon beams for users at 21 beam lines. It is operated at 6 GeV with a beam current of 100 mA in top-up mode and is in operation for users since 2010. [...]
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