The Analysis of Slit Collimator Alignment for Proton Beam Experiments

ter Haar, J.G.J. (2020) The Analysis of Slit Collimator Alignment for Proton Beam Experiments. Bachelor's Thesis, Physics.

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Abstract

In narrow field proton dosimetry, a symmetrical and predictable dose profile is desired. In achieving this symmetry, using a LANEX/CCD camera and a paddle detector setup, a slit collimator was aligned with the direction of a 150 MeV proton beam. With the LANEX/CCD camera setup, a light image was measured of the proton field provided by the slit for various orientations of the slit collimator. Using the paddle detector the total number of protons passing through the slit collimator was measured. To assess the alignment a method was developed in Matlab using the FWHM of the dose profile as a function of the angle as a symmetry criterion. Gaussian’s were fitted through the middle of these images and the FWHM was determined. A local minimum, at an angle of 0.10o ± 0.5, in the FWHM, was found in the LANEX/CCD setup. In the paddle detector setup a maximum in the number of protons passing through the slit collimator, at an angle of 0.1022o ± 0.0145o , was found. Two studies were done at KVI-CART in 20011 and 20192 in which different LANEX/CCD setups were used. From the results of our study, the influence of the LANEX/CCD setup on the results of these two studies could be ruled out.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Graaf, E.R. van der and Dendooven, P.G.
Degree programme:	Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	07 Jul 2020 12:18
Last Modified:	07 Jul 2020 12:18
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/22496

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