|THD03||An Improved Concept for Self-Extraction Cyclotrons||extraction, cyclotron, ion-source, simulation||330|
A study is made for an improved concept of self-extraction in low and medium energy cyclotrons to be used for production of medical isotopes. The prototype of the self-extracting cyclotron was realized around the year 2001*. From this machine, currents higher than 1 mA were extracted and transported to a Pd-103 production target. However, at the higher intensities, the extraction efficiency was dropping to about 70-75%, and the extracted emittance was rather poor, leading to additional losses in the beamline. Several improvements of the original concept are proposed: i) the beam coherent oscillation (as needed for good extraction) is no longer generated with harmonic coils, but is obtained from a significant off-centring of the ion source, ii) the cyclotron magnet has perfect 2-fold symmetry, allowing the placement of two internal sources and dual extraction on two opposite hill sectors, iii) a substantial improvement of the magnetic profile of the hill sectors. Simulations show an extraction efficiency up to almost 95% and emittances at least a factor 3 lower as compared to the original design. The new magnetic design is shown, and results of beam simulation are discussed.
* W. Kleeven et al., 16th Int. Conf. Cycl. Appl. 2001, East-Lansing.
|Slides THD03 [4.060 MB]|
|DOI •||reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THD03|
|About •||paper received ※ 19 September 2019 paper accepted ※ 27 September 2019 issue date ※ 20 June 2020|
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