IPAC'23 - Student Poster Session Guide

IPAC’23 / STUDENT POSTER SESSION GUIDE 9 Student Poster Session SUPM003 Slow Extraction Techniques from Fixed Field Accelerators Adam Steinberg (Cockcroft Institute), Rebecca Taylor (CERN) . Elena Benedetto (South East European International Institute for Sustainable Technologies), Jaroslaw Pasternak (Science and Technology Facilities Council), Robert Appleby (Cockcroft Institute), Suzanne Sheehy (Australian Nuclear Science and Technology Organisation). Fixed Field Accelerators are a candidate for future hadron cancer therapy facilities as their high repetition rate and large energy acceptance enables novel treatment modalities such as high dose rate FLASH. However, conventional dose delivery mechanisms are still necessary, requir- ing continuous beam delivery over 1--30s. This work is the first study of slow extraction from a scaling Fixed Field Accelerator, using the LhARA facility for baseline parameters. At a horizontal tune of 10/3, the intrinsic sextupole strength of the nonlinear FFA magnetic field is sufficient to excite the resonance, although extraction is better controlled using an additional excitation sextupole at a tune close to 8/3, with radiofrequency knock-out extraction. Including consider- ations of issues due to nonlinear fields and limitations required to keep the tune energy-inde- pendent, slow extraction from Fixed Field Accelerators is successfully demonstrated. SUPM004 Absolute Calibration of BSI monitors in the SPS North Area at CERN Luana Parsons França (CERN) , Maarten Van Dijk (European Organization for Nuclear Research). Carsten Welsch (The University of Liverpool), Claudia Ahdida, Federico Ravotti, Federico Roncarolo, Giuseppe Pezzullo, Johannes Bernhard, Markus Brugger, Robert Froeschl, Yann Pira (European Orga- nization for Nuclear Research), Hao Zhang (Cockcroft Institute). Developments in current and future experiments in the SPS North Area (NA) and PS East Area (EA) fixed target beam lines at CERN, including the “Physics Beyond Colliders” (PBC) program, require an accurate determination of the number of protons on target (POT). The re-calibra- tion of Beam Secondary Emission Intensity monitors (BSI), recently completed in one of the NA branches, reduced the estimated uncertainty on the absolute POT to a few percent. The calibration is based on an activation technique, applied to metal foils (Al, Cu), installed in front of the BSI and irradiated with the nominal proton intensity for a short period. The number of protons is determined from offline gamma spectrometry analysis of the foils and compared to the total integrated signal of the BSI. A description of the method, data analysis and results, will be presented and followed by considerations intended to standardise the procedure for future regular use in all SPS NA beamlines. SUPM005 Impact of multiple beam-beam encounters on LHC absolute- luminosity calibrations by the van der Meer method Joanna Wanczyk (CERN) . Anne Dabrowski (Northwestern University), David Stickland (Princeton University), Tatiana Pieloni (European Organization for Nuclear Research), Witold Kozanecki (Commissariat à l’Energie Atomique).