Two Dimensional Beam Profile Monitoring by Using a LYSO Crystal

Abstract
We made a prototype of two dimensional proton beam profilemonitoring equipment by using a LYSO scintillation crystalattached to a photo multiplier tube mounted on a 2 dimensionalscanner. We measured the beam profiles of the 45-MeV proton beamfrom the MC-50 cyclotron at Korea Institute of Radiological andMedical Science by using our equipment. We measured the energyand the flux of the proton beam simultaneously as our devicemoving on the 2 dimensional area of $180 imes 180$ $m mm^2$.To measure the two dimensional beam profile, we scanned from $-$90mm to $+$90 mm along the x-axis, as well as along y-axis. We alsoscanned the beam profile along the two diagonal lines from thepoint ($-$90, $-$90) to the point (90, 90) and from point ($-$90,90) to the point (90, $-$90). We showed the possibility of ourprototype equipment as a two dimensional proton beam profilemonitoring device from these measurements.

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