CYCLOTRONS2022 - List of Authors (Schmidt, A.)

Paper	Title	Page
WEAO01	OPAL Simulation on the Beam Transmission in the Central Region of the Medical Cyclotron COMET at Paul Scherrer Institute	148
	H. Zhang, C. Baumgarten, P. Frey, M. Hartmann, R. Kan, M. Kostezer, A. Mülhaupt, J.M. Schippers, A. Schmidt, J. Snuverink PSI, Villigen PSI, Switzerland
	The use of the medical cyclotron COMET for FLASH proton therapy requires a high beam transmission from the ion source through the central region apertures. This paper first presents a model of the COMET cyclotron featuring a rotatable ion source, a movable puller, and an adjustable first fixed slit (FFS), implemented with the OPAL framework. The electromagnetic field is individual-ly created to match each specific configuration. The beam optics parameters, especially beam position and beam size upon approaching and after passing FFS, have been studied in detail. The OPAL simulations demon-strate that an optimal configuration of the ion source, the puller and the FFS is key to achieve a high beam trans-mission. An experimental test gave a 2.8 times higher intensity within COMET cyclotron with the modifications derived on the basis of the simulations: a 0.57 mm shift of puller and a 5.6° rotation of ion source. The simula-tions indicate that, with these modifications, the beam can still be centered and accelerated to the extraction energy of 250 MeV. Next step is to investigate the influ-ence of such modifications upon the acceleration and the extraction, again with an iterative approach combining simulations and experiments.
	Slides WEAO01 [5.351 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEAO01
About •	Received ※ 13 December 2022 — Revised ※ 09 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 11 March 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

OPAL Simulation on the Beam Transmission in the Central Region of the Medical Cyclotron COMET at Paul Scherrer Institute

148

H. Zhang, C. Baumgarten, P. Frey, M. Hartmann, R. Kan, M. Kostezer, A. Mülhaupt, J.M. Schippers, A. Schmidt, J. Snuverink
PSI, Villigen PSI, Switzerland

The use of the medical cyclotron COMET for FLASH proton therapy requires a high beam transmission from the ion source through the central region apertures. This paper first presents a model of the COMET cyclotron featuring a rotatable ion source, a movable puller, and an adjustable first fixed slit (FFS), implemented with the OPAL framework. The electromagnetic field is individual-ly created to match each specific configuration. The beam optics parameters, especially beam position and beam size upon approaching and after passing FFS, have been studied in detail. The OPAL simulations demon-strate that an optimal configuration of the ion source, the puller and the FFS is key to achieve a high beam trans-mission. An experimental test gave a 2.8 times higher intensity within COMET cyclotron with the modifications derived on the basis of the simulations: a 0.57 mm shift of puller and a 5.6° rotation of ion source. The simula-tions indicate that, with these modifications, the beam can still be centered and accelerated to the extraction energy of 250 MeV. Next step is to investigate the influ-ence of such modifications upon the acceleration and the extraction, again with an iterative approach combining simulations and experiments.

Slides WEAO01 [5.351 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-CYCLOTRONS2022-WEAO01

About •

Received ※ 13 December 2022 — Revised ※ 09 January 2023 — Accepted ※ 01 February 2023 — Issue date ※ 11 March 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)