Cyclotrons2019 - List of Keywords (emittance)

Paper	Title	Other Keywords	Page
MOP004	Beam Dynamics Simulation of the Extraction for a Superconducting Cyclotron SC240	extraction, cyclotron, proton, simulation	31
	Z. Wu, K.Z. Ding, J. Li, Y. Song ASIPP, Hefei, People’s Republic of China Z. Wang HFCIM, HeFei, People’s Republic of China
	In order to diversify the company’s cyclotron, a design study has been carried out on a 240 MeV superconducting cyclotron SC240 for proton therapy, which is based on our experience in design of SC200. In order to increase turn separation and extraction efficiency, resonant precessional extraction method is employed in the extraction system. A first harmonic field consistent with the Gaussian distribution is added to introduce beam precessional motion. Its effects on phase space evolution and turn separation increase is studied by a high efficiency beam dynamics simulation code. According to the study, its amplitude and phase have been optimized to meet the requirements of extraction beam dynamics. Based on beam dynamics simulation, the parameters of extraction system elements (two electrostatic deflectors and six magnetic channels) are chosen. Besides, the effects of sectors spiral direction on beam extraction are studied. Extraction efficiencies and beam parameters have been calculated.
	Poster MOP004 [1.696 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP004
About •	paper received ※ 14 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP016	Vertical Focussing with a Field Gradient Spiral Inflector	cyclotron, experiment, quadrupole, optics	58
	A.H. Barnard, J.I. Broodryk, J.L. Conradie, J.G. De Villiers, J. Mira, F. Nemulodi, R.W. Thomae iThemba LABS, Somerset West, South Africa
	Traditional spiral inflectors suffer from vertical defocussing, leading to beam loss. In this study the electrode shape of an inflector is modified to intentionally produce transverse electric field gradients, which have a significant influence on the optics. This is done by placing the traditionally parallel electrodes at an angle relative to each other in the transverse plane, creating a quadrupole field on the central path. Varying the electrode angle along the path length creates an alternating-gradient effect. The electrode entrance and exit faces are also shaped to create quadrupoles inside the fringe field. By numerical optimisation a design with good vertical focussing is obtained. Experiments show a roughly 100% increase in transmission in cases where the buncher is turned off. However, high losses at extraction are observed with the buncher turned on, due to RF-phase spread introduced by longitudinal defocussing in the inflector. This results in an improvement of only 20% during normal cyclotron operation, and shows that an inflector should ideally focus vertically and longitudinally at the same time. Ongoing work to achieve such combined focussing is described.
	Poster MOP016 [1.410 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP016
About •	paper received ※ 13 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP021	Simulation of Beam Extraction from TR24 Cyclotron at IPHC	extraction, cyclotron, betatron, experiment	76
	N.Yu. Kazarinov, I.A. Ivanenko JINR, Dubna, Moscow Region, Russia T. Adam, F.R. Osswald, E.K. Traykov IPHC, Strasbourg Cedex 2, France
	The CYRCé (CYclotron pour la ReCherche et Enseignement) TR24 cyclotron is used at IPHC (Institut Pluridisciplinaire Hubert Curien) for the production of radio-isotopes for diagnostics, medical treatments and fundamental research in radiobiology. The TR24 cyclotron produced and commercialized by ACSI delivers a 16-25 MeV proton beam with intensity from few nA up to 500 µA. The TR24 is a compact isochronous cyclotron with normal-conducting magnet and stripper foil for the beam extraction. The calculation model for OPERA 3D program code is described. The magnetic field map in the working region of the cyclotron is generated. The beam characteristics outside the cyclotron, that will serve as initial conditions for the design of future beam lines are determined.
	Poster MOP021 [15.509 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP021
About •	paper received ※ 29 August 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP010	Buncher for the Optimization of the Injection of a 70 MeV Cyclotron	cyclotron, injection, simulation, ion-source	173
	P. Antonini, A. Lombardi, M. Maggiore, L. Pranovi INFN/LNL, Legnaro (PD), Italy L. Buriola Univ. degli Studi di Padova, Padova, Italy
	The design of an injection buncher for the 70 MeV cyclotron in use at LNL labs of INFN is under way. This buncher is to be installed between the ion source and the injection, to match the injected beam to the acceptance angle of the injection. The planned design is a 3/2 beta-λ double-gap driven with one or two harmonics of the 56 MHz RF frequency. Remotely-driven variable capacitors will be used for easy tuning of the matching box from the control system. The mechanical layout and simulations will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP010
About •	paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THD02	Central Region Upgrade for the Jyväskylä K130 Cyclotron	injection, cyclotron, ECR, ECRIS	326
	T. Kalvas, P.M.T. Heikkinen, H.A. Koivisto JYFL, Jyväskylä, Finland E. Forton, W.J.G.M. Kleeven, J. Mandrillon, V. Nuttens IBA, Louvain-la-Neuve, Belgium
	The Jyväskylä K130 cyclotron has been in operation for more than 25 years providing beams from H to Au with energies ranging from 1 to 80 MeV/u for nuclear physics research and applications. At the typical energies around 5 MeV/u used for the nuclear physics program the injection voltage used is about 10 kV. The low voltage limits the beam intensity especially from the 18 GHz ECRIS HIISI. To increase the beam intensities the central region of the K130 cyclotron is being upgraded by increasing the injection voltage by a factor of 2. The new central region with spiral inflectors for harmonics 1-3 has been designed. The new central region shows better transmission in simulations than the original one for all harmonics and especially for h=2 typically used for nuclear physics. The engineering design for the new central region is being done.
	Slides THD02 [12.967 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THD02
About •	paper received ※ 15 September 2019 paper accepted ※ 27 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOP004

Beam Dynamics Simulation of the Extraction for a Superconducting Cyclotron SC240

extraction, cyclotron, proton, simulation

31

Z. Wu, K.Z. Ding, J. Li, Y. Song
ASIPP, Hefei, People’s Republic of China
Z. Wang
HFCIM, HeFei, People’s Republic of China

In order to diversify the company’s cyclotron, a design study has been carried out on a 240 MeV superconducting cyclotron SC240 for proton therapy, which is based on our experience in design of SC200. In order to increase turn separation and extraction efficiency, resonant precessional extraction method is employed in the extraction system. A first harmonic field consistent with the Gaussian distribution is added to introduce beam precessional motion. Its effects on phase space evolution and turn separation increase is studied by a high efficiency beam dynamics simulation code. According to the study, its amplitude and phase have been optimized to meet the requirements of extraction beam dynamics. Based on beam dynamics simulation, the parameters of extraction system elements (two electrostatic deflectors and six magnetic channels) are chosen. Besides, the effects of sectors spiral direction on beam extraction are studied. Extraction efficiencies and beam parameters have been calculated.

Poster MOP004 [1.696 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP004

About •

paper received ※ 14 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

Export •

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

MOP016

Vertical Focussing with a Field Gradient Spiral Inflector

cyclotron, experiment, quadrupole, optics

58

A.H. Barnard, J.I. Broodryk, J.L. Conradie, J.G. De Villiers, J. Mira, F. Nemulodi, R.W. Thomae
iThemba LABS, Somerset West, South Africa

Traditional spiral inflectors suffer from vertical defocussing, leading to beam loss. In this study the electrode shape of an inflector is modified to intentionally produce transverse electric field gradients, which have a significant influence on the optics. This is done by placing the traditionally parallel electrodes at an angle relative to each other in the transverse plane, creating a quadrupole field on the central path. Varying the electrode angle along the path length creates an alternating-gradient effect. The electrode entrance and exit faces are also shaped to create quadrupoles inside the fringe field. By numerical optimisation a design with good vertical focussing is obtained. Experiments show a roughly 100% increase in transmission in cases where the buncher is turned off. However, high losses at extraction are observed with the buncher turned on, due to RF-phase spread introduced by longitudinal defocussing in the inflector. This results in an improvement of only 20% during normal cyclotron operation, and shows that an inflector should ideally focus vertically and longitudinally at the same time. Ongoing work to achieve such combined focussing is described.

Poster MOP016 [1.410 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP016

About •

paper received ※ 13 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

Export •

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

MOP021

Simulation of Beam Extraction from TR24 Cyclotron at IPHC

extraction, cyclotron, betatron, experiment

76

N.Yu. Kazarinov, I.A. Ivanenko
JINR, Dubna, Moscow Region, Russia
T. Adam, F.R. Osswald, E.K. Traykov
IPHC, Strasbourg Cedex 2, France

The CYRCé (CYclotron pour la ReCherche et Enseignement) TR24 cyclotron is used at IPHC (Institut Pluridisciplinaire Hubert Curien) for the production of radio-isotopes for diagnostics, medical treatments and fundamental research in radiobiology. The TR24 cyclotron produced and commercialized by ACSI delivers a 16-25 MeV proton beam with intensity from few nA up to 500 µA. The TR24 is a compact isochronous cyclotron with normal-conducting magnet and stripper foil for the beam extraction. The calculation model for OPERA 3D program code is described. The magnetic field map in the working region of the cyclotron is generated. The beam characteristics outside the cyclotron, that will serve as initial conditions for the design of future beam lines are determined.

Poster MOP021 [15.509 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP021

About •

paper received ※ 29 August 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

Export •

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

TUP010

Buncher for the Optimization of the Injection of a 70 MeV Cyclotron

cyclotron, injection, simulation, ion-source

173

P. Antonini, A. Lombardi, M. Maggiore, L. Pranovi
INFN/LNL, Legnaro (PD), Italy
L. Buriola
Univ. degli Studi di Padova, Padova, Italy

The design of an injection buncher for the 70 MeV cyclotron in use at LNL labs of INFN is under way. This buncher is to be installed between the ion source and the injection, to match the injected beam to the acceptance angle of the injection. The planned design is a 3/2 beta-λ double-gap driven with one or two harmonics of the 56 MHz RF frequency. Remotely-driven variable capacitors will be used for easy tuning of the matching box from the control system. The mechanical layout and simulations will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP010

About •

paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

Export •

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

THD02

Central Region Upgrade for the Jyväskylä K130 Cyclotron

injection, cyclotron, ECR, ECRIS

326

T. Kalvas, P.M.T. Heikkinen, H.A. Koivisto
JYFL, Jyväskylä, Finland
E. Forton, W.J.G.M. Kleeven, J. Mandrillon, V. Nuttens
IBA, Louvain-la-Neuve, Belgium

The Jyväskylä K130 cyclotron has been in operation for more than 25 years providing beams from H to Au with energies ranging from 1 to 80 MeV/u for nuclear physics research and applications. At the typical energies around 5 MeV/u used for the nuclear physics program the injection voltage used is about 10 kV. The low voltage limits the beam intensity especially from the 18 GHz ECRIS HIISI. To increase the beam intensities the central region of the K130 cyclotron is being upgraded by increasing the injection voltage by a factor of 2. The new central region with spiral inflectors for harmonics 1-3 has been designed. The new central region shows better transmission in simulations than the original one for all harmonics and especially for h=2 typically used for nuclear physics. The engineering design for the new central region is being done.

Slides THD02 [12.967 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THD02

About •

paper received ※ 15 September 2019 paper accepted ※ 27 September 2019 issue date ※ 20 June 2020

Export •

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