OPTIMATION OF DECY-13 CYCLOTRON MAGNET MAPPING SYSTEM

Abstract

OPTIMATION OF DECY-13 CYCLOTRON MAGNET MAPPING SYSTEM. A cyclotron magnet serves to
deflect the particle beam so that the beam trajectory is circular and also serves to focus the beam. The
magnetic flux density of a cyclotron magnet must satisfy the isochronous curve. The magnetic field
distribution need to be measured in order to know that the magnetic flux density has fulfilled the isochronous
curve, therefore a mapping system is needed to obtain the magnetic field distribution data. The design and
construction of mechanical system of magnetic field mapping has been carried out in 2013 using fly mode
algorithm, but the test results is not accurate yet. Therefore it is necessary to optimize of the magnetic field
mapping system. The aim of this optimation is to improve the accuracy of step position and the precission of
magnetic field measurement of the mapping system of DECY-13 cyclotron magnet. The research was done
by changing the mapping methods that previously based on the fly mode with the step mode. In the step
mode, the magnetic field data would be taken when the probe has been completely stopped at the specified
position. The magnet mapping system has been optimized with 89.58% of the average step position
accuracy. The mapping system has to be started at minimum of 2 hours after the Magnet Power Supply
(MPS) is turned on, in order to get 3.53 gauss of the precision of magnetic field measurement. Although the
magnetic field measurement of 1st sensor and 2nd sensor have measurement maximum different of 6.3 gauss
but the two sensors have the same pattern of magnetic field average. The mapping result from one of 2
sensors can be used to calculate magnetic field parameter if the magnetic field is symmetric.