Einleitung

Schedler, Jan; Häusler, Alexander

doi:10.1007/978-3-531-93219-4_1

Cited by 4 publications

(2 citation statements)

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“…A simple higher order modes (HOM) damping system and a new temperature stabilization have been developed and installed at the accelerat-ing PETRA cavities resulting in a significant reduction of HOM driven beam instabilities [57]. To achieve effective damping of the remaining excitation of multi-bunch instabilities, a powerful bunch-by-bunch feedback system has been developed and successfully set up at the storage ring [58][59][60][61][62][63]. In addition, a precise stabilization of the rf amplitude and phase, as required by the new bunch-by-bunch feedback system, has been achieved by installation of a new low level rf system (LLRF) which is based on digital signal processing [64].…”

Section: High Beam Intensitiesmentioning

confidence: 99%

Beam and spin dynamics in the fast ramping storage ring ELSA: Concepts and measures to increase beam energy, current and polarization

et al. 2017

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Abstract. The electron accelerator facility ELSA has been operated for almost 30 years serving nuclear physics experiments investigating the sub-nuclear structure of matter. Within the 12 years funding period of the collaborative research center SFB/TR 16, linearly and circularly polarized photon beams with energies up to more than 3 GeV were successfully delivered to photoproduction experiments. In order to fulfill the increasing demands on beam polarization and intensity, a comprehensive research and upgrade program has been carried out. Beam and spin dynamics have been studied theoretically and experimentally, and sophisticated new devices have been developed and installed. The improvements led to a significant increase of the available beam polarization and intensity. A further increase of beam energy seems feasible with the implementation of superconducting cavities.

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Section: High Beam Intensitiesmentioning

confidence: 99%

Beam and spin dynamics in the fast ramping storage ring ELSA: Concepts and measures to increase beam energy, current and polarization

et al. 2017

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“…Explicit computational results. Using programs [Sch11] written in Magma [BCP97], we explicitly solved (A.0.7) for n ≤ 34 (and double-checked, for n ≤ 7 and low enough degrees for n ∈ {8, 9}, that the result matches a direct computation of HP 0 without using Theorem A.0.6). The result is given in Figures 1 and 2. A.4.…”

Section: Proofs Of Corollariesmentioning

confidence: 99%

Poisson Traces for Symmetric Powers of Symplectic Varieties

Etingof

Schedler

2013

International Mathematics Research Notices

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We compute the space of Poisson traces on symmetric powers of affine symplectic varieties. In the case of symplectic vector spaces, we also consider the quotient by the diagonal translation action, which includes the quotient singularities T * C n−1 /Sn associated to the type A Weyl group Sn and its reflection representation C n−1 . We also compute the full structure of the natural D-module, previously defined by the authors, whose solution space over algebraic distributions identifies with the space of Poisson traces. As a consequence, we deduce bounds on the numbers of finite-dimensional irreducible representations and prime ideals of quantizations of these varieties. Finally, motivated by these results, we pose conjectures on symplectic resolutions, and give related examples of the natural D-module. In an appendix, the second author computes the Poisson traces and associated D-module for the quotients T * C n /Dn associated to type D Weyl groups. In a second appendix, the same author provides a direct proof of one of the main theorems.

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Aufstand der Zeichen? Rechtsextreme Sticker in Hoyerswerda – Alltagskultur und Medienereignis

Enzenbach

2017

Medien Und Kulturen Des Konflikts

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Einleitung

Cited by 4 publications

References 1 publication

Beam and spin dynamics in the fast ramping storage ring ELSA: Concepts and measures to increase beam energy, current and polarization

Beam and spin dynamics in the fast ramping storage ring ELSA: Concepts and measures to increase beam energy, current and polarization

Poisson Traces for Symmetric Powers of Symplectic Varieties

Aufstand der Zeichen? Rechtsextreme Sticker in Hoyerswerda – Alltagskultur und Medienereignis

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