IPAC'23 - Student Poster Session Guide

IPAC’23 / STUDENT POSTER SESSION GUIDE 14 Student Poster Session Curtain (BGC) monitors. By design, their operation induces secondary particles used to mea- sure beam properties, but also to radiation showers in the tunnel that result in radiation levels proportional to the beam intensity and gas pressure. In this work, we characterize such radia- tion showers using data from LHC operation and Monte Carlo simulations with the FLUKA code. SUPM015 First measurements of fourth and fifth order chromaticity in the LHC Mael Le Garrec (European Organization for Nuclear Research) . Ewen Maclean, Rogelio Tomas (European Organization for Nuclear Research), Felix Carlier (Ecole Polytechnique Fédérale de Lausanne). Chromaticity up to the third order in the LHC has been well observed in the LHC’s first and second operational runs, with regular beam-based measurements performed during commis- sioning and machine development. In previous runs however, no higher-order chromaticity could be observed. In 2022, dedicated collimators setups meant optics measurements could benefit from an improved range of momentum-offset for the chromaticity studies. This allowed the observation of fourth and fifth order chromaticity in the LHC at 450GeV for the first time. Measurements were performed for several machine configurations. In this paper, results of the higher order non-linear chromaticity are presented and compared to predictions of the LHC magnetic model. SUPM016 Comparison of 352 MHz LINAC structures for injection into an ion therapy accelerator Lazar Nikitovic (European Organization for Nuclear Research) . Maurizio Vretenar, Toms Torims (European Organization for Nuclear Research). In the frame of ongoing initiatives for the design of a new generation of synchrotron-based accelerators for cancer therapy with ion beams, an analysis of linac designs has been started, to address a critical element with strong impact on performance and cost of the accelerator. The goal is to identify alternatives at lower cost and similar or possibly smaller footprint than the standard 217 MHz injector presently used in all carbon therapy facilities in Europe. As an additional feature, a new linac design can be tailored to produce radioisotopes for treatment and diagnostics in parallel with operation as synchrotron injector. In this paper is analysed the attractive option of moving to 352 MHz frequency, to profit of reliable mechanical designs already developed for protons and of the cost savings that can be obtained using as RF power sources klystrons with a much lower cost per Watt than tubes or solid-state units. The paper will present a Quasi-Alvarez Drift Tube Linac (DTL) version of an injector linac for car- bon ions at q/m=1/3 and compare it with recently developed DTL and IH designs. The option of a separated-IH type linac will be also discussed, together with a standard IH design at 352 MHz. Finally, a DTL design at 352 MHz for injection of fully stripped helium ions into the synchrotron will be presented.