The Bgo-Od Experiment at Elsa

Bantes, B.; Bayadilov, D.; Beck, R.; Becker, M.; Bella, A.; Bieling, J.; Böse, S.; Braglieri, A.; Brinkmann, Kai-Thomas; Burdeinyi, D.; Curciarello, F.; Leo, V. De; Salvo, R. Di; Dutz, H.; Elsner, D.; Fantini, A.; Frese, T.; Friedrick, S.; Frommberger, F.; Ganenko, V. B.; Gervino, G.; Ghio, F.; Giardina, G.; Girolami, B.; Glazier, D. I.; Goertz, S.; Gridnev, A.; Gutz, E.; Hammann, D.; Hannappel, J.; Hillert, W.; Ignatov, A.; Jahn, O.; Jahn, R.; Joosten, R.; Jude, Thomas; Klein, Frank; Koop, K.; Krusche, B.; Lapik, A.; Sandri, P. Levi; Lopatin, I.; Mandaglio, G.; Messi, F.; Messi, R.; Metag, V.; Moricciani, D.; Nanova, M.; Nedorezov, V.; Noviskiy, D.; Pedroni, P.; Romaniuk, M.; Rostomyan, T.; Schaerf, C.; Schmieden, H.; Sumachev, V. V.; Tarakonov, V.; Vegna, V.; Vlasov, P.; Walther, Dirk; Watts, D. P.; Zaunick, H.-G.; Zimmermann, T.

doi:10.1142/s2010194514600933

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…The data was recorded turn-by-turn by the ADC of the DSP module resulting in a sampling frequency of 1.8236 MHz. Above noise 3 an exponential growth of the oscillation amplitude can be observed which confirms again that longitudinal coherent oscillations are already present at the storage ring for relatively moderate beam currents. After activation of the feedback system at 5 ms, the reduction of the amplitude within 300 μs and the damping performance of the system are clearly visible.…”

Section: Grow-damp Measurement and Fourier Spectrumsupporting

confidence: 73%

“…Within the collaborative research center SFB/TR16, which has been established in 2004, ELSA is serving two photoproduction experiments (CBELSA/TAPS [2] and BGO-OD [3]) with a quasi-continuous electron beam. The external electron beam is generated via slow resonance extraction from the storage ring over a periodically recurring time frame of a few seconds and converted to a photon beam via the process of bremsstrahlung.…”

Section: Introductionmentioning

confidence: 99%

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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: Grow-damp Measurement and Fourier Spectrumsupporting

confidence: 73%

Section: Introductionmentioning

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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“…• The BGO-OD experiment at ELSA: This experiment [19] is still in the setup phase. It is mentioned here because experiments to search for η mesic states have been suggested for this unique facility [20].…”

Section: Production In γN Reactionsmentioning

confidence: 99%

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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The production of η and η mesons in photon-and hadron-induced reactions on free and quasifree nucleons and on nuclei is reviewed. The extensive database on γN → ηN , for both proton and neutron targets, is described in detail and its implications for the search for N resonances much heavier than the dominant S 11 (1535) discussed. Though less is currently known about the production of the η or of ηπ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed.The production of the η-meson in pp and pn collisions shows once again the strong influence of the S 11 (1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for η production. This difference is reflected in the important final state interaction effects of the η in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both γA and pA collisions. The inclusive photoproduction of η, η , and ηπ pairs from nuclei provides further information regarding the production mechanism and the interaction of the η and η with nuclei and the ηπ pairs may even allow access to low mass ηA systems that are forbidden in direct single-meson photoproduction.

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“…The BGO-OD experiment [17,18,19] has an extensive range of strangeness photoproduction proposals, with the first large dataset taken earlier this year 1 . The extremely forward charged particle acceptance, complemented by neutral particle reconstruction over a central region, allows the study of low momentum exchange processes and complicated mixed charge final states.…”

Section: Introductionmentioning

confidence: 99%

Strangeness photoproduction at the BGO-OD experiment

Jude¹,

Alef²,

Bauer³

et al. 2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremstrahlung photon beam to investigate the excitation spectrum of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating the photoproduction of hadrons of non-zero strangeness. The high momentum resolution at forward angles covers a kinematic region where t-channel exchange mechanisms play a dominant role. Access to this low momentum transfer region also allows the investigation of degrees of freedom not derived from constituent quark models, for example, the role of (vector) meson -baryon interactions and dynamically generated states in photoproduction reactions. Data taking for the first part of an extensive physics programme is complete and preliminary results and ongoing analysis are presented.

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The Bgo-Od Experiment at Elsa

Cited by 8 publications

References 7 publications

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

Production of η and η′ mesons on nucleons and nuclei

Strangeness photoproduction at the BGO-OD experiment

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