IPAC'23 - Student Poster Session Guide

IPAC’23 / STUDENT POSTER SESSION GUIDE 20 Student Poster Session Nowadays, high-current accelerators demand high particle transmission and reduced longitu- dinal emittance; hence, effective bunching systems are requested. The concept based on an ef- ficient, compact design called “Double drift Double Harmonic Buncher - DDHB” fulfills these two requirements for a c.w. or pulsed beam injection into an RFQ, a DTL, or a cyclotron. The propos- al is associated with two buncher cavities separated by a drift space and an additional drift at the end of the system for longitudinal beam focus at the entrance of the next accelerator unit, whose candidates can be one of the mentioned above. The investigations are focused on ex- ploring accurate acceptance rates. To obtain successful and understandable outputs from the DDHB concept, a new multi-particle tracking beam dynamics code called “Bunch Creation from a DC beam - BCDC” has been developed for detailed investigations of space charge effects. It allows to calculate the transformation of intense dc beams into particle bunches in detail with a selectable degree of space charge compensation at every location. This paper presents the results from various investigations with and without space charge effects. SUPM029 Beam dynamics and electron optics for dark field imaging in the SEALAB Photoinjector Benat Alberdi-Esuain (Helmholtz-Zentrum Berlin) . Ultrafast electron probing techniques offer unique experimental tools to access the structural dynamics of ultrafast photoinduced processes in molecular and condensed phase systems. Here we propose to employ the exceptional and versatile electron beam parameters of the SEALAB Photoinjector to develop a unique facility for ultrafast electron diffraction and imaging (UED and UEI) dedicated to experiments with high sensitivity in space, energy, and time. The complete design course for such facility is presented in this work. The study of the beam dy- namics in the SEALAB Photoinjector is tackled first. The aim is to achieve ultra-short electron pulses and low energy spread while keeping the arrival time stability and the emittance at a minimum for high spatial and temporal resolutions. Then, the design of the electron optics is performed to switch between diffraction and direct imaging modes while minimizing the ab- errations and offering variable magnification. The beam-line modifications to enable dark field imaging are introduced. Finally, possible diagnostics methods are discussed and the results of an experimental campaign for emittance and spatial resolution characterization with appropri- ate beam conditions for UED and UEI are presented. SUPM030 Development of an Ion-Acoustic Dose-Deposition Mapping System for LhARA Maria Maxouti (Imperial College London) . Hin Tung Lau, Josie McGarrigle (Imperial College London), Anthea MacIntosh-LaRocque, Kenneth Long (Imperial College of Science and Technology), Emma Harris, Jeffrey Bamber (The Joint Department of Physics, Institute of Cancer Research and Royal Marsden NHS Foundation Trust), Ben Smart, John Matheson (Science and Technology Facilities Council), Colin Whyte (University of Strathclyde), Ben Cox (Department of Medical Physics and Biomedical Engineering).