Non-invasive beam profile monitor for medical accelerators. (May 2020)

• Record Type: Journal Article
• Authors: Kumar, N.; Salehilashkajani, A.; Zhang, H.D.; Ady, M.; Forck, P.; Glutting, J.; Jones, O.R.; Kersevan, R.; Marriott-Doddington, T.; Mazzoni, S.; Rossi, A.; Schneider, G.; Udrea, S.; Veness, R.; Welsch, C.P.
• Is Part Of: Physica medica. Volume 73(2020)
• Page Start: 173
• Page End: 178
• Publication Date: 2020-05
• Subjects: Non-invasive beam profile monitor -- Beam induced fluorescence -- Ionization profile monitor; Medical physics -- Periodicals; Biophysics -- Periodicals; Biophysics -- Periodicals; Imagerie médicale -- Périodiques; Radiothérapie -- Périodiques; Rayons X -- Sécurité -- Mesures -- Périodiques; Physique -- Périodiques; Médecine -- Périodiques; 610.153
• DOI: 10.1016/j.ejmp.2020.04.023
• Languages: English
• ISSNs: 1120-1797

Abstract

Highlights: Development of two non-invasive beam profile monitors. Key features of both profile monitors. Experimental results for the beam profile measurements using helium, nitrogen and neon gases. Density measurements for the gas jet. Ongoing development of Quantum gas jet system and for optimization of gas jet density. Abstract: A beam profile monitor based on a supersonic gas-curtain is currently under development for transverse profile diagnostics of electron and proton beams in the High Luminosity LHC. This monitor uses a thin supersonic gas curtain that crosses the primary beam to be characterized under an angle of 45 degrees. The fluorescence caused by the interaction between the beam and gas-curtain is detected using a specially designed imaging system to determine the 2D transverse profile of the primary beam. Another prototype monitor based on beam induced ionization is installed at The Cockcroft Institute. This paper presents the design features of both the monitors, the gas-jet curtain formation and various experimental tests, including profile measurements of an electron beam, using helium, nitrogen and neon as gases. Such a non-invasive online beam profile monitor would be highly desirable also for medical LINAC's and storage rings as it can characterize the beam without stopping machine operation. The paper discusses opportunities for simplifying the monitor design for integration into a medical accelerator and expected monitor performance.