Contributions to a conference proceedings

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2018-06-21
10:31
[PUBDB-2018-02340] Contribution to a conference proceedings
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Status of Impedance Modeling for the PETRA IV
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 , 4 pp. ()
The diffraction limited synchrotron light source envisioned for the PETRA IV project will require strong focusing to produce the small emittances in both planes. The large natural chromaticity together with small dispersion will require very strong sextupoles [...]
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2018-06-15
12:04
[PUBDB-2018-02290] Contribution to a conference proceedings/Contribution to a book
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Integrated rare-Earth doped mode-locked lasers on a CMOS platform
Silicon Photonics: From Fundamental Research to Manufacturing : [Proceedings] - SPIE, 2018. - ISBN 97815106189859781510618992 - doi:10.1117/12.2318010
Silicon Photonics: from Fundamental Research to Manufacturing, SPIE.Photonics Europe, StrasbourgStrasbourg, France, 22 Apr 2018 - 26 Apr 20182018-04-222018-04-26
SPIE , 11 pp. () [10.1117/12.2318010]  GO
Mode-locked lasers provide extremely low jitter optical pulse trains for a number of applications ranging from sampling of RF-signals and optical frequency combs to microwave and optical signal synthesis. Integrated versions have the advantage of high reliability, low cost and compact. [...]
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2018-06-15
11:35
OpenAccess [PUBDB-2018-02283] Contribution to a conference proceedings
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Characterization of Polarization-Dependent Emittance From an Array of Au Nanorods using Velocity Map Imaging Spectrometer
9th International Particle Accelerator Conference, IPAC 2018, VancouverVancouver, Canada, 30 Apr 2018 - 4 May 20182018-04-302018-05-04 , 3 pp. () [10.3204/PUBDB-2018-02283]  GO
Electron beams of high quality, e.g., low emittance, are of crucial importance for cutting-edge scientific instruments, such as x-ray free electron lasers (XFELs) and ultrafast electron diffraction (UED) setups. A velocity-map-imaging (VMI) spectrometer was implemented to characterize the intrinsic root-mean-square (rms) normalized emittance from photocathodes. [...]
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2018-06-15
11:20
OpenAccess [PUBDB-2018-02282] Contribution to a conference proceedings
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Segmented terahertz driven device for electron acceleration
9th International Particle Accelerator Conference, IPAC 2018, VancouverVancouver, Canada, 30 Apr 2018 - 4 May 20182018-04-302018-05-04 , 3 pp. () [10.3204/PUBDB-2018-02282]  GO
We present a staged Terahertz accelerator composed of a compressor and accelerator stage. Preliminary experiments are described demonstrating >30 keV energy gain and compression of electrons down to 100 fs for 55 keV electron bunches from a DC-gun [...]
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2018-06-12
16:19
[PUBDB-2018-02252] Journal Article/Contribution to a conference proceedings/Contribution to a book
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Beam Tail Measurements using Wire Scanners at DESY
AIP Conference Proceedings - AIP, 2003. - ISBN - doi:10.1063/1.1638338
Beam Halo Dynamics, Diagnostics, and Collimation: 29th ICFA Advanced Beam Dynamics Workshop on Beam Halo Dynamics, Diagnostics, and Collimation, HALO 03, MontaukMontauk, New York (USA), 19 May 2003 - 23 May 20032003-05-192003-05-23
AIP conference proceedings 693(1), 129 - 132 () [10.1063/1.1638338]  GO
Wire scanners are used usually to measure the profile of the core of the beam. Especially at high beam currents the wire has to flip very fast through the beam, otherwise it will burn This is not true for the tails of the beam where the wire can be moved very slowly (or even stay stationary). [...]
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2018-06-12
14:33
OpenAccess [PUBDB-2018-02251] Contribution to a conference proceedings
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Influence of Intrabeam Scattering on the Emittance of 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-2018-02251]  GO
PETRA III is a 6 GeV hard X-ray synchrotron radiation source at DESY in Hamburg (Germany) and is in user operation since 2010. The natural emittance of PETRA III is extremely low with 1.3 nm·rad and the coupling is typically less than 1 %. [...]
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2018-05-31
09:14
OpenAccess [PUBDB-2018-02151] Contribution to a conference proceedings
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Microwave instability and energy spread measurement via vertical dispersion bump in PETRA III
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 , 3 pp. () [10.3204/PUBDB-2018-02151]  GO
The recent measurement of bunch length versus current indicated that the longitudinal impedance (Z/n) is 0.15 Ohm in close agreement with the impedance model [1]. Naïve application of Keil-Schnell criteria predicts that the threshold of microwave instability at 0.25 mA. [...]
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2018-05-30
11:47
OpenAccess [PUBDB-2018-02141] Contribution to a conference proceedings
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Beam Dynamics on a Coupling Resonance at PETRA III
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 , 3 pp. () [10.3204/PUBDB-2018-02141]  GO
Working on a coupling resonance is a usual way of producing round beams in a synchrotron. The beam dynamics in this regime is however more complicated, and the emittance is sensitive to the working point, coupling correction, and bunch current drop with time, which complicates the operation. [...]
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2018-05-28
12:49
OpenAccess [PUBDB-2018-02117] Contribution to a conference proceedings
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An Option to Generate Seeded FEL Radiation for FLASH1
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 , 4 pp. () [10.3204/PUBDB-2018-02117]  GO
The FLASH free-electron laser (FEL) at DESY is currently operated in self-amplified spontaneous emission (SASE) mode in both beamlines FLASH1 and FLASH2. Seeding offers unique properties for the FEL pulse, such as full coherence, spectral and temporal stability [...]
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2018-05-25
15:59
OpenAccess [PUBDB-2018-02105] Report/Contribution to a conference proceedings

Axion mass in the case of post-inflationary Peccei-Quinn symmetry breaking
[DESY-18-077; arXiv:1805.09618]
53rd Rencontres de Moriond, La ThuileLa Thuile, Italy, 17 Mar 2018 - 24 Mar 20182018-03-172018-03-24 , 5 pp. () [10.3204/PUBDB-2018-02105]  GO
The axion not only solves the strong CP puzzle, but it also may be the main constituent of cold dark matter. We review the axion dark matter predictions for the case that the Peccei-Quinn symmetry is restored after inflation..
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