5 documents found, page 1 of 1
Experimental observation of the motion of ions in a resonantly driven plasma wa...
Turner, M.; Walter, E.; Amoedo, C.; Torrado, N.; Lopes, N.; Sublet, A.; Bergamaschi, M.; Pucek, J.; Mezger, J.; van Gils, N.; Verra, L.We show experimentally that an effect of motion of ions, observed in a plasma-based accelerator, depends inversely on the plasma ion mass. The effect appears within a single wakefield event and manifests itself as a bunch tail, occurring only when sufficient motion of ions suppresses wakefields. Wakefields are driven resonantly by multiple bunches, and simulation results indicate that the ponderomotive force ca...
Hosing of a long relativistic particle bunch in plasma
Nechaeva, T.; Verra, L.; Pucek, J.; Ranc, L.; Bergamaschi, M.; Della Porta, G. Z.; Muggli, P.; Agnello, R.; Ahdida, C. C.; Amoedo, C.; Andrebe, Y.Experimental results show that hosing of a long particle bunch in plasma can be induced by wakefields driven by a short, misaligned preceding bunch. Hosing develops in the plane of misalignment, self-modulation in the perpendicular plane, at frequencies close to the plasma electron frequency, and are reproducible. Development of hosing depends on misalignment direction, its growth on misalignment extent and on ...
Filamentation of a relativistic proton bunch in plasma
Verra, L.; Amoedo, C.; Torrado, N.; Clairembaud, A.; Mezger, J.; Pannell, F.; Pucek, J.; van Gils, N.; Bergamaschi, M.; Della Porta, G. Z.; Lopes, N.We show in experiments that a long, underdense, relativistic proton bunch propagating in plasma undergoes the oblique instability, which we observe as filamentation. We determine a threshold value for the ratio between the bunch transverse size and plasma skin depth for the instability to occur. At the threshold, the outcome of the experiment alternates between filamentation and self-modulation instability (evi...
Customer knowledge and behavior on the use of food refrigerated display cabinet...
C. Goncalves, J.; Guiné, Raquel P. F.; Amoedo, C.; Correia, PaulaThis article presents a study on customer knowledge and habits regarding the use of refrigerated display cabinets (RDC). The study was carried out on a sample of Portuguese retail stores’ customers, using a questionnaire survey available through an Internet platform. The sample consisted of 136 individuals, who voluntarily participated in the study. Questions included the characterization of the sociodemographi...
Habits of portuguese consumers on the acquisition and consumption of chilled an...
Gonçalves, J. C.; Amoedo, C.; Correia, Paula; Guiné, Raquel P. F.The consumption of cold-chain products, such as dairy, meat, fish, fresh juices and vegetables, ready to eat meals or desserts, is very meaningful in the context of the whole food supply chain since these products are pivotal in most western households. The consumption of cold-chain products in Portugal is still unexplored. Hence, this work aimed to carry out a questionnaire survey to characterize the Portugues...