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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 6: Accelerators for Medical Applications (joint session ST/AKBP)

AKBP 6.2: Vortrag

Mittwoch, 2. April 2025, 14:15–14:30, ZHG009

Beam Dynamics and Energy Variation in H-Type Drift Tube Linac for Proton Eye Therapy — •Ali Almomani — Physics Department, Yarmouk University, 21163 Irbid, Jordan

In this study, we investigate the beam dynamics of a proposed H-type drift tube linac (DTL) designed for proton therapy in eye cancer treatment, utilizing the KONUS (Kombinierte Null Grad Struktur) beam dynamics approach and LORASR code. The linac design accelerates protons from 3 MeV to 70 MeV across six cavities with 140 accelerating gaps along a 20-meter structure, operating at a frequency of 325.244 MHz. To ensure transverse beam focusing and beam matching, 11 triplet quadrupole lenses are distributed along the linac. The beam dynamics analysis yielded optimized values for drift tube lengths and gap distances, and simulations showed 100% beam transmission efficiency. The design demonstrated low emittance growth, with less than 20% transversely and 90% longitudinally, ensuring a highly focused beam. The output beam emittances are smaller than what cyclotron can offer, facilitating the generation of a pencil beam capable of scanning the tumor volume from one point to another. Additionally, energy variation options allow flexible beam energy adjustment between 58 and 70 MeV, enabling customizable treatment depths. The energy variation may be realized by varying the gap of voltage levels. The simulation results indicate a stable structure even in the presence of machine errors, supporting further development for RF simulations and mechanical modeling. The overall outcomes are promising, confirming the feasibility of the design for proton therapy applications.

Keywords: H-type DTL; KONUS Beam Dynamics; Eye Therapy