IPAC'23 - Student Poster Session Guide

IPAC’23 / STUDENT POSTER SESSION GUIDE 27 Student Poster Session Limited dynamic aperture which is in the consequence of strong nonlinearities in a low emit- tance storage ring, is a challenging issue from beam dynamics point of view. In the present study, we have applied three families of focusing and defocusing octupoles to the storage ring lattice with the aim of increasing dynamic aperture and beam lifetime . We have discussed different methods to optimize of the position and strength of octupoles so that each octupole family fights a specific resonance driving term. SUPM044 Beam dynamics optimization of the EuPRAXIA@SPARC_LAB RF photoinjector Gilles Jacopo Silvi (Istituto Nazionale di Fisica Nucleare - Sez. Roma 1) . Alberto Bacci, Anna Giribono, Cristina Vaccarezza, Luigi Faillace, Marcello Rossetti, Massimo Ferrario, Riccardo Pompili (Istituto Nazionale di Fisica Nucleare), Andrea Mostacci, Daniele Francescone, Enri- ca Chiadroni, Martina Carillo, Pasqualina Iovine (Sapienza University of Rome). At EuPRAXIA@SPARC_LAB an X-ray FEL user facility is driven by a plasma accelerator in the particle-driven configuration where an ultra-relativistic beam, the driver, through a plasma ge- nerates a wake of charge density useful for accelerate a witness beam. The electron bunches are generated through the so-called comb technique in an RF injector that consist of a 1.6 cell S-band gun followed by four S-band TW accelerating structures. The main working point fo- resees a 30pC witness and a 200pC driver longitudinally compressed in the first accelerating structure operated in the velocity-bunching regime, that allows to accelerate and manipulate the beam to reach proper transverse and longitudinal parameters. The optimization of the witness emittance is performed with additional magnetic field around the gun and the S-band structures and by shaping the laser pulse at the cathode. The paper reports on beam dynamics studies performed also for beams with higher charges to maximize the transformer ratio in the plasma and the beam brightness. In addition, the insertion of an X-band RF cavity after the gun is proposed aiming to shape the beam current distribution as needed and stabilize it with respect to RF jitters. SUPM045 Characterization of plasma-discharge Capillaries for Plasma- based Particle Acceleration Lucio Crincoli (Istituto Nazionale di Fisica Nucleare) . Angelo Biagioni, Cristina Mariani, Donato Pellegrini, Gemma Costa, Maria Pia Anania, Mario Galletti, Martina Del Giorno, Massimo Ferrario, Riccardo Pompili, Stefano Romeo, Valerio Lollo (Istituto Nazio- nale di Fisica Nucleare), Martina Carillo, Pasqualina Iovine (Sapienza University of Rome). Novel particle accelerators based on plasma technology allow a drastic reduction in size, due to the high accelerating field established inside plasmas, which are created and confined by specific devices. Plasma Wakefield Acceleration experiments are performed at the SPARC_LAB test facility (Laboratori Nazionali di Frascati - INFN) by using gas-filled capillaries, in which the plasma formation is achieved by ionizing hydrogen gas through high voltage pulses. In this work, the characterization of gas-filled plasma-discharge capillaries is presented. Several